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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   总分: 149分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) (组内1/93) 切至整卷模式 搜藏此题  
第 1 题组 (共 93 题 103 分)
  Suppose that an objecte 7)z/ye xga/3qsexk 1 travels from one point in space to another. Make a comparison b 7ake1q)z/xesgx 3y/eetween the displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) (组内2/93) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the instantaneous velkgvza1 e)m j5-ocity?

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3#
 
单选题 ( 1.0 分) (组内3/93) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their 8 jp/*q,m+wczbyuql2car can go "from zero to sixty in 8 s". This is a descriptionqjwc2ubq8 ,pz+/ y* lm of

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4#
 
单选题 ( 1.0 分) (组内4/93) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experie4ma)oa e1o3fn(4d r bunces an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) (组内5/93) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to thc q-9lxer 1*.pw093udc( gwq huoxeu) e East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratp duec.3)1hgq99 w e uuw0xo(*qxlcr- ion.

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6#
 
单选题 ( 1.0 分) (组内6/93) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the 0sl3br9sv ra29,k vbfWest (-x direction) begins to slow down as it approachesl,9b39frv v sks2ar 0b a traffic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) (组内7/93) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constanoexocw0g --wvtn4 l3( t velocity. Make a statement concerni-xww(l0o 3oct- gn v4eng its acceleration.

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8#
 
单选题 ( 1.0 分) (组内8/93) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it mean that thk7vlmcc q2v9l r/t +.ze acceleration is zero? Supportmq /tc 7.lrv2c+k zlv9 your answer with an example.

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9#
 
单选题 ( 1.0 分) (组内9/93) 切至整卷模式 搜藏此题  
  Can an object's velocity change direction when its acceleration is constant? ps6g/a /6cc;0 rdtjzr Support your answer with aga crs6/j zcr ;/06tpdn example.

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10#
 
单选题 ( 1.0 分) (组内10/93) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constwah7jr9m *pv xci/b:i/uh7:m ant acceleration. Make a statement concerning its motion with resp :7vi/xh/u m*:wh9rpima7jc bect to time.

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11#
 
单选题 ( 1.0 分) (组内11/93) 切至整卷模式 搜藏此题  
  Can an object have increasing speed whdox rxbgw j k5/(s4/o+ile its acceleration is decreasing? Support yourwxbox rg4k/ d(j/os+5 answer with an example.

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12#
 
单选题 ( 1.0 分) (组内12/93) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smooth hill of icij;; ;e b82 rs4+mik2hqnmhbplz ml)2e. Make a statement concerning its acceqilm2 n;s)r;bk2hi4hml;+ 2 p8 zm jbeleration.

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13#
 
单选题 ( 1.0 分) (组内13/93) 切至整卷模式 搜藏此题  
  Under what condition is average veloci,g7pk9vn8v zsbdd812c r 9on9jaj 0xlty equal to the average of the object's initial 0, gk nsa d991rpvb9v cjd87jx2lzno 8and final velocity?

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14#
 
单选题 ( 1.0 分) (组内14/93) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate at the same rate. H9wwayj;5 /k ihowever, objectwaij kywh;95 / A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) (组内15/93) 切至整卷模式 搜藏此题  
  Objects A and B both star84kbfq8rk dr /gl- c:znwb 6vumq8,alg3y) s;t from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is gk :bv bn 6-mq3g8;4k y8rus/c)r,lfzw8q ldathe distance traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) (组内16/93) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the abs :z6q9:e qgzsfq(mbe/ence of friction, which of the following is true concerningz:qege(m zf/q 96q:bs its motion?

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17#
 
单选题 ( 1.0 分) (组内17/93) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of friction6z9w b 99msbtkth,0ct, which of the foll6999 bt0stw, zb mhtckowing is true concerning its motion?

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18#
 
单选题 ( 1.0 分) (组内18/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement about tj-kw8f5bi,m q he velocity and the acceleration whenkm ,fiwq5 8bj- the ball reaches the highest point.

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19#
 
单选题 ( 1.0 分) (组内19/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration just befolm* 4i(gi4+t0k(u1tr vgmb g hre it reaches its highest point?4giht4 (m0v+ t muglg1*irb(k

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20#
 
单选题 ( 1.0 分) (组内20/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straigu *b4 y9 zi5ler dvazox7n,2.oht up, reaches a maximum height, then falls to its initialv ri*l9xo.,a4 5 bozdze7uy2n height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) (组内21/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maxd hlc,7b y:m cbc5ow*4imum height, then falls to its initial h*ol5h cm, cyb:7cb4dweight. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) (组内22/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the ab g0f5)9fl ouhmsence of air resistance. Make a statement concerni0lhfm59)u ogfng its acceleration.

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23#
 
单选题 ( 1.0 分) (组内23/93) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. s,p2vui: m4pg What is her acceleration when she she reaches terminv,24g sum:pipal velocity?

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24#
 
单选题 ( 1.0 分) (组内24/93) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identical secon* a gf6max(ej)d ball is thrown upward with a speed 2v (ma)xgfaj*6 (e twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) (组内25/93) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second vv; -okkhx0*y later, ball B is dropped from the same building. As time progresses, the dista kx*vo-; vk0hynce between them

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26#
 
单选题 ( 1.0 分) (组内26/93) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second la *o7yro 8s/vyf+e(d. rghw ol:ter, ball B is droppedf 8yo 7.orsrg /:owvl de+h*(y from the same building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) (组内27/93) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is thrown up, and mp(q,)xs2cnq tf b.6u the other i)x2mst c6, (n ufqpq.bs thrown down, both with the same initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) (组内28/93) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of fky ;t.7tv7if a building. A second brick is thrown straight down from the same building. They are released at thev ttfk77;y i.f same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) (组内29/93) 切至整卷模式 搜藏此题  
  An object is moving qmzpm6:b 0qu -z/,mucjx 0c1swith constant non-zero velocity in the +x axis. The position versus time graph of this object,zq 0bjz:/sxm mm6-quucp10c is

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30#
 
单选题 ( 1.0 分) (组内30/93) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero accelerati0:qwb gv+v0xx on in the +x axis. The position versus t:gx wx+vv0 0qbime graph of this object is

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31#
 
单选题 ( 1.0 分) (组内31/93) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. The veloi6 +nm m1yush ;ac94q y8zt;dtcity versus time graph of9z6 + ;mty4h8; q1acimsyndu t this object is

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32#
 
单选题 ( 1.0 分) (组内32/93) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +u .jt26v8grat x axis. The velocity vatv8utj. rg62ersus time graph of this object is

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33#
 
单选题 ( 1.0 分) (组内33/93) 切至整卷模式 搜藏此题  
  The slope of a position versus time grapkp6v52yx1 lk ih gives

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34#
 
单选题 ( 1.0 分) (组内34/93) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time graph givesw69h;j fm 0rya;mb *zt

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35#
 
单选题 ( 1.0 分) (组内35/93) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versus time graorsbie.0 :* tl ji p:xe7nl7o9ph gives

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36#
 
单选题 ( 1.0 分) (组内36/93) 切至整卷模式 搜藏此题  
  The area under a curve in a velo5 c/gtrupq 5,d zdo/.hcity versus time graph gives

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37#
 
单选题 ( 1.0 分) (组内37/93) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal line, the objeep.1g0tx2gm.ihm8v lyc wa )2ct mxhw8apt..y120v 2gcg) iml eis

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38#
 
单选题 ( 1.0 分) (组内38/93) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical line, the6iv 7 ,aeh(rve object is6 e7vh(vaer,i

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39#
 
单选题 ( 1.0 分) (组内39/93) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an oi 4ph-*pt, yt1fw eiz696fvkbbject is a horizontal line, the object iiw h-6e*4vp b9k,yttzfi6 p1fs

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40#
 
单选题 ( 1.0 分) (组内40/93) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an obw nnfc:*8v)deqnh1tn vv/o m.y4fo ul(4v, 9pject is a straight line making an angle of 30 degrees with the time ax(d )ypvv.:o8 nnut,vnql hffe1 9von4 /cm4* wis, the object is

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41#
 
单选题 ( 1.0 分) (组内41/93) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and . )+y c)wu9eesz g4ykkthen 11.0 m south. Find both the distance traveled and the magnitude of thu)zywes4.k+gc eky9)e displacement vector.

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42#
 
单选题 ( 1.0 分) (组内42/93) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still wf 1ky+*gy3az zc3e(j jater. How long will it take to move 12 km upstream in a river floyg+eaf*z y1j z( 3jk3cwing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) (组内43/93) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 60 .8*ur yjx,bnw8pp uyu:xwsmi = 1609 m)

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44#
 
单选题 ( 1.0 分) (组内44/93) 切至整卷模式 搜藏此题  
  What must be your average speed in j m* k:cfmhqmnu.h1puf: 43x* order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) (组内45/93) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 47j mar*x0r-bx2.0 km) in 2 hours and 57 min. What is the average speed oj*rxxr mba70- f the runner in m/s?

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46#
 
单选题 ( 1.0 分) (组内46/93) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take for 2b 3 0a/vxq1yst r3p7le:erzfit to travel 400 km?

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47#
 
单选题 ( 1.0 分) (组内47/93) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels in one year. The speed of:sl6o, md,cy e ligh m:d6, cesy,olt is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) (组内48/93) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to the ej/x8wrbd0m qof*:v3 side for 4.0 s, how far doe8 v xwr*3 0:dfj/bqom you travel during this inattentive period?

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49#
 
单选题 ( 1.0 分) (组内49/93) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track (400 m),+tosxrptd:;bb 2 b q5,5l 1jfc in 100 s, your average velocity i5t1fd5 pt:+ rbqxljbscob2 ;, s

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50#
 
单选题 ( 1.0 分) (组内50/93) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km southre9 rdox- r:)p, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. -pd xe:rr9or) What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) (组内51/93) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Poled qeu(694wnd c. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This twd edu64n9 cq(rip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) (组内52/93) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from schue9 ,mdha g2p6ool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home aftmd62aue 9h p,ger driving 4 hours and 15 minutes. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) (组内53/93) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What ispip ;7uc 09ifc the average speed of the motorist f7ui9;0fpc cip or this trip?

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54#
 
单选题 ( 1.0 分) (组内54/93) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and -lt.jpxo.*k7 m )h p j)(a4 bqilqy5tu2.0 h at 100 km/h. What is her average speed for th7 jl -.jiub( .)ao q q4*y)pk5htmxlpte trip?

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55#
 
单选题 ( 1.0 分) (组内55/93) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h and theni kdmbd5ds7vh+94 h w; at 250 mi/h north for 750 miles. What is; bdmh9svkdw4i 5d7+h the average speed for the trip?

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56#
 
单选题 ( 1.0 分) (组内56/93) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (the person who runs the l rv1nk6p3qq5))ysu wxast 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the teauwqn5) qky 1r6x) vps3m A runner not lose the race?

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57#
 
单选题 ( 1.0 分) (组内57/93) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes t0qcrk9 8cst d+; c(wtho a stop after 10 s. The car's average velocity duri08+(chckcs;t r wqt9d ng deceleration was 76 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) (组内58/93) 切至整卷模式 搜藏此题  
  An airplane increases its speed from p,e( 6diveajv)2ue/r 100 m/s to 160 m/s, at the average rate of (6 dv,ve ui)jere/ pa2$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) (组内59/93) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates at the rat m*/qj:/.ufp4omazojf t(d k7e of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) (组内60/93) 切至整卷模式 搜藏此题  
  A cart starts from rest and accelerates ats+ukc-gkr/y,2fq sc 8 m,6f6oz x/crq $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) (组内61/93) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with h( +ftqngh: tg63m f+da constant acceleratioght+6+ftqm g:n3f hd(n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) (组内62/93) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 6.9 m/s experiencest w(4+os8 egnv a constant acceleration ofs4t(egw vo 8n+ $3.3 \; m/s^2$. What is the cart's displacement during the first 9.4 s of its motion?

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63#
 
单选题 ( 1.0 分) (组内63/93) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) witw0dss ow2 d65zh a speed of 351 m/s strikes a sandbag and penetrates a distance of 70.20do6s w52wsdz 6 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) (组内64/93) 切至整卷模式 搜藏此题  
  A jet fighter plane is layb9sga 7 q(*nvunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, anva*9(ysg7 q bnd this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) (组内65/93) 切至整卷模式 搜藏此题  
  A car starting from reuzo m 4h2:dd ,e(hx(tvst moves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) (组内66/93) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to zn/9 cazhbf5lbh3;8 w 80 m/s in a distance of 200 m. What is its average accele;h3 nzwa 5cfz9 /hbbl8ration?

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67#
 
单选题 ( 1.0 分) (组内67/93) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. Durr9kwa i.jkfdnf7 hrt6 u4v jrb-z)22l 2axj5(ing the first second it travels 8.8 m. How .j6jxu2)t r f5f- rhn4dav 29 ja7(l2kkzribwfar will it travel during the third second?

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68#
 
单选题 ( 1.0 分) (组内68/93) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant accel zvlu/hdjq(- vg01 a4aeration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during 4h/v-alqzuv1g( 0dj athis time?

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69#
 
单选题 ( 1.0 分) (组内69/93) 切至整卷模式 搜藏此题  
  A car starts from rest and acceleratt(0 x: 7p dool-xeowd*es uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
填空题 ( 2.0 分) (组内70/93) 切至整卷模式 搜藏此题  
  A car with good tires on a dry romcmb6rq lg+z f/rh1v /i- x0u8ad can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

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71#
 
填空题 ( 3.0 分) (组内71/93) 切至整卷模式 搜藏此题  
  At the instant a traffic light turns green, a car that has been waiting at the s3a o ,m-w wkr0j7s8kzintersros8-jzakmk ww7 ,30 section starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

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72#
 
单选题 ( 1.0 分) (组内72/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a d6*zwk5y-k +d+p0/ t2cdp/sqwjml mx speed of 12 m/s on the surface of planet X where p+m s2w+w kz d0c-p/d lj6d*mtqky5/xthe acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) (组内73/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s 64qcval-tg ;h8 b7 h) 5e:j x,ngniuhnon the surface of planet X where the accj t8hn) 7;xc5i -uq ln6,gg4 evbahhn:eleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) (组内74/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of e6iroq608fi 4ycoyy; 15 m/s on the surface of planet X where the o08yi66c y;e yqf4rioacceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) (组内75/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s on the suf.;74b ncx tj h0cde4zrface of planet X where the acceleratio4.xf0e7 j cnthbd4; czn due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) (组内76/93) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If youb) ai )s8pl5i8 gnv/sor friend holds a ruler between your fingei v)8i8bn/ls5s)poa grs and releases it without warning, how far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) (组内77/93) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocuuvc7lj t vx63h565y oity after 3.00 7htuo vyu 5l3jcx v566s?

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78#
 
单选题 ( 1.0 分) (组内78/93) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point in 5 s. Whatxnkcgj2pq he0uo94k9-gj knx,g-s6 9 is the initial speed of thenpj9x0c694k- s 2kk9quhjxngg e-,go bullet?

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79#
 
单选题 ( 1.0 分) (组内79/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 36.0 m/s. How long doz3*s g+k2gbuln 4bo3ke ov/(oes it take to return to its startingg b3vko+e(/n bzsol2 ugk3*4 o point?

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80#
 
单选题 ( 1.0 分) (组内80/93) 切至整卷模式 搜藏此题  
  A ball is thrown dow 7kk z9xbo))uanward from the top of a building with an initial speed of 14 m/s. It strikes the ground after 3.b)kk7u)aox 9z 4 s. How high is the building?

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81#
 
填空题 ( 3.0 分) (组内81/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (only fill in n* v *o7)gtt q.ku0tsyuumerical value in the bl7 sot*tu.)qt*0 guvykanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 6.0 分) (组内82/93) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 25.0 m/s.fzg0 ci5 emc8g:kj/;a 8 y(zv/e3jdan (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 14.0 m above the point of contact a second time.  (数值)  $s$

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83#
 
单选题 ( 1.0 分) (组内83/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is t acv/e;7btvedm3ez.g31te 5 p he velocity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) (组内84/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the velocity at ( y1oef/s y(lpb0;hhgt = 2.5 s?


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85#
 
单选题 ( 1.0 分) (组内85/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the veloci7uscm(oj*xx.uyp )l,ty at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) (组内86/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the velocity at t = xm00ooc*hl0z1a9)txfo 4q ld 5.5 s?


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87#
 
单选题 ( 1.0 分) (组内87/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the average velocity from 0 to 4)yw4q5 u( 1gjk9cai-f j 1jwuc.0 s?


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88#
 
单选题 ( 1.0 分) (组内88/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the averahqwd0la( k2 e/9ltwm6ge velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) (组内89/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the acm)dzx fn(,lc6 celeration at 1.0 s?


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90#
 
单选题 ( 1.0 分) (组内90/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is .pt:duo w-lm/eru7z.t7) xmsthe acceleration at 3.0 s?


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91#
 
单选题 ( 1.0 分) (组内91/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is t w .kyl;/vk007h4qng4hen x0 +/y sqgv6oyobohe average acceleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) (组内92/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the avera) *la myy50m+zj)l1h4tabd9p rg ws3yge acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) (组内93/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the 5 e bn9,u3fqrx0lkga/displacement from 0 to 8.0 s?


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94#
 
问答题 ( 1.0 分) (组内1/46) 切至整卷模式 搜藏此题  
第 2 题组 (共 46 题 46 分)
Does a car speedometer measure speed, velocity? {speed|d iu(s7;5mrlc: zq0bhr rm-n+ velocity}
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95#
 
判断题 ( 1.0 分) (组内2/46) 切至整卷模式 搜藏此题  
  An object can have a varying speed if its velodi2 i6mr.4smh kkn 9i mf662r7lp1xd vcity is constant.

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96#
 
判断题 ( 1.0 分) (组内3/46) 切至整卷模式 搜藏此题  
  The velocity of an object can be negative when its acceleratione 0 3ju cla.z0c8vixk* is positive.

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97#
 
判断题 ( 1.0 分) (组内4/46) 切至整卷模式 搜藏此题  
  If one object has a greateonp/p))hh+y u1 -mp cv e6j6ckr speed than a second object, the first must have a greate-yu o pj/m pkp6e6nhcv)c1+ h)r acceleration.

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98#
 
判断题 ( 1.0 分) (组内5/46) 切至整卷模式 搜藏此题  
  Two cars emerge side by side from a tufr1 8hkg8um+ a9v/-ruaq/ jy6 x mkv:mnnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

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99#
 
判断题 ( 1.0 分) (组内6/46) 切至整卷模式 搜藏此题  
  An object can be increasing in speed asd6l hly3yboy ) 1qcg04 its acceleration decreases.

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100#
 
填空题 ( 1.0 分) (组内7/46) 切至整卷模式 搜藏此题  
  A baseball player hits a foul ball stra. fu43wcfk(gtvv 5j+r ight up into the air. It leaves the bat with a sfg+ru cvjwvt4 3k.f5( peed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

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101#
 
单选题 ( 1.0 分) (组内8/46) 切至整卷模式 搜藏此题  
  As a freely falling object speeds up, heznn5)u+08+i06a , t8q z.gznjhsz ug rv5di what is happening to its acceleration, howzvn+q+i6 n zzid5j ,h8a05) zh gsun.eru8g0t does it change if air friction is ignored?

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102#
 
单选题 ( 1.0 分) (组内9/46) 切至整卷模式 搜藏此题  
  As a freely falling object speeds up, what is happenin l,0a di3a1ybvwn5u5rj ml6uhr4 z,w 5g to its acceleration, how does it chan,3r01w54 drjuy l l5mawhuba5v,i6 nz ge if air friction CAN NOT be ignored?

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103#
 
单选题 ( 1.0 分) (组内10/46) 切至整卷模式 搜藏此题  
  An object that is thrown vertically upward will return to its ori.aaxr-5kz )6:ke+ 7a: zqdyydi+aafoginal position with the same speed as it had initially if air resistance is negligible. If air resist.fe+7kdok xad a:ar:+aya) yz-65iqzance is appreciable, how will this result be altered?

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104#
 
判断题 ( 1.0 分) (组内11/46) 切至整卷模式 搜藏此题  
  An object can have zero ve9zuub k97ojhf *w7a2olocity and nonzero acceleration at the same time.

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105#
 
判断题 ( 1.0 分) (组内12/46) 切至整卷模式 搜藏此题  
  An object can have nonzero velocity and zero acceleration at the vodo cj 6thzpz,7 +;ryu+-ts,same time.

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106#
 
判断题 ( 1.0 分) (组内13/46) 切至整卷模式 搜藏此题  
  An elevator moving from the second floor to the fifth floor making no s7txvq ( -p5wkht 4;jjwtops along the way has;-(t wqp kjj5v x4h7wt zero acceleration all the time.

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107#
 
填空题 ( 1.0 分) (组内14/46) 切至整卷模式 搜藏此题  
  A rolling ball moves f)zcl-s3nbc s(rom $x_1=2.2 \mathrm{~cm}$ to $x_2=-6.2 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

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108#
 
填空题 ( 1.0 分) (组内15/46) 切至整卷模式 搜藏此题  
  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

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109#
 
填空题 ( 1.0 分) (组内16/46) 切至整卷模式 搜藏此题  
  A person jogs eight complete laps around )bi aw5k7e f)sa quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

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110#
 
填空题 ( 1.0 分) (组内17/46) 切至整卷模式 搜藏此题  
  A horse canters away from its trainer in a straight line, movia9+6/xry/s gkrd b,a ing 101 m away in 11.2 s. It then turns abruptly and gallopsg/i+a rb,ks/ 69xay dr halfway back in 4.6 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

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111#
 
填空题 ( 1.0 分) (组内18/46) 切至整卷模式 搜藏此题  
  A car accelerates fromns5h3cp:;kcuat s. a (c*el)l $12 \; m/s$ to $23 \; m/s$ in 4.5 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

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112#
 
填空题 ( 1.0 分) (组内19/46) 切至整卷模式 搜藏此题  
  A car slows down from )+yq a clkm.w-x1a;ki$21 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

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113#
 
填空题 ( 1.0 分) (组内20/46) 切至整卷模式 搜藏此题  
  A light plane must reach a speed of g gv.q vh..,ay$28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

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114#
 
填空题 ( 1.0 分) (组内21/46) 切至整卷模式 搜藏此题  
  A world-class sprinthu ubje6unu -2cb752ter can burst out of the blocks to essentially top speed aboutu6ue cbhn 7 2u25b-jut $10.4 \; m/s$ in the first 11.8 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

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115#
 
填空题 ( 1.0 分) (组内22/46) 切至整卷模式 搜藏此题  
  A car slows down uniformly from a speeac*t vv7cy f*(b,: cwgd of $16 \; m/s$ to rest in 4.06 s. How far did it travel in that time?  (数值)  $m$

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116#
 
填空题 ( 1.0 分) (组内23/46) 切至整卷模式 搜藏此题  
  In coming to a stop, a car lead1q00bks9v+kbdq uqb5i ic 85ves skid marks 92 m long on the highway. Assuming a deceli 0bbq 0q81q5 uvk5bs+9icdk deration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

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117#
 
填空题 ( 1.0 分) (组内24/46) 切至整卷模式 搜藏此题  
  A car is behind a truck lhnk8 )+ axq5 4mo+tqb+/wpykgoing $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

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118#
 
填空题 ( 1.0 分) (组内25/46) 切至整卷模式 搜藏此题  
  A runner hopes to complete the 10,000-m run in less thae ena,d vxe,6- y7sd.bn 30.0 min. After exactlye,,s a7ye.nxvd6dbe- 27.0 min, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$

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119#
 
填空题 ( 1.0 分) (组内26/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the to.wh.u tmo:/xizpm pu 045u+ hip of a cliff. It hits the ground below after $1.95 \; s$. How high is the cliff?  (数值)  $m$

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120#
 
填空题 ( 1.0 分) (组内27/46) 切至整卷模式 搜藏此题  
  Estimate (a) how long it tooivjw 3,ry twt 26csj2/vmf*i9k a stone to fall straight down from the top of the Empm/ w,*c22vtwyvs63f 9jt iirjire State Building (364 m high)  (数值)  $s$, and (b) its velocity just before landing?  (数值)  $m/s$

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121#
 
填空题 ( 1.0 分) (组内28/46) 切至整卷模式 搜藏此题  
  A baseball is hit nearly straight up vi b, wuzbd:st;)p 56rinto the air with a speed of $21 \; m/s$. (a) How high does it go?  (数值)  $m$ (b) How long is it in the air?  (数值)  $s$

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122#
 
填空题 ( 1.0 分) (组内29/46) 切至整卷模式 搜藏此题  
  A ballplayer catches a ball 2.4 s after throwing it vertically ukb , kmd)x3594owpb ngpward. (a) With 3bg kmdw b5)no xkp4,9what speed did he throw it?  (数值)  $m/s$ and (b) what height did it reach?  (数值)  $m$

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123#
 
填空题 ( 1.0 分) (组内30/46) 切至整卷模式 搜藏此题  
  A helicopter is ascending5 vzebe* lw*a2,kog1d vertically with a speed of $5.06 \; m/s$. At a height of 81 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?  (数值)  $s$
[Hint: The package’s initial speed equals the helicopter’s.]

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124#
 
填空题 ( 1.0 分) (组内31/46) 切至整卷模式 搜藏此题  
  A stone is thrown vertically upward with a spey4:0aglm (e lzed of $16 \; m/s$. (a) How fast is it moving when it reaches a height of 9.8 m?  (数值)  $m/s$ (b) How long is required to reach this height for the first time?  (数值)  $s$ (c) How long is required to reach this height for the second time?  (数值)  $s$

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125#
 
填空题 ( 1.0 分) (组内32/46) 切至整卷模式 搜藏此题  
  A falling stone takes 0.12 s to travel past a window 1.7 m tall. From what heig98*m getdo fxl51kla.4:i.hhgftnq 8 ht above the top of th 9l5t oahmffht*.i8qg x 8n. :lkg14dee window did the stone fall?  (数值)  $m$


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126#
 
填空题 ( 1.0 分) (组内33/46) 切至整卷模式 搜藏此题  
  A rock is dropped from a sea ck71:nzdzx;1 e *luzldv m;uezq,.b(q liff, and the sound of it striking the ocean is heard 2.4 s later. If bn( mu7. vl,zu:d;;kzzqqeled1 z x*1the speed of sound is $340 \; m/s$, how high is the cliff?  (数值)  $m$

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127#
 
填空题 ( 1.0 分) (组内34/46) 切至整卷模式 搜藏此题  
  A stone is thrown vertically ,mm+ 5c t2fwr :kq.zadl4mub 2upward with a speed of $11 \; m/s$ from the edge of a cliff 41.1 m high (a) How much later does it reach the bottom of the cliff?  (数值)  $s$ (b) What is its speed just before hitting?  (数值)  $m/s$ (c) What total distance did it travel?  (数值)  $m$

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128#
 
填空题 ( 1.0 分) (组内35/46) 切至整卷模式 搜藏此题  
  A baseball is seen to pass u*p1kzll 8t8u/3voy td pward by someone on the 9th floor (28 m above the street) with8l*tzpd3 t1u8 yl/kov a vertical speed of $12 \; m/s$. If the ball was thrown from the street, (a) what was its initial speed?  (数值)  $m/s$ (b) what maximum altitude does it reach?  (数值)  $m$ (c) how many seconds ago was the baseball thown from the street?  (数值)  $s$ (c) In how many seconds will it reach the street again?  (数值)  $s$

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129#
 
填空题 ( 1.0 分) (组内36/46) 切至整卷模式 搜藏此题  
  The acceleration due to gravity on the Moon is about q5-4(gv8 ttqspx 9oay one-sixth what it is on Earth. If an object is thrown vertically upward on the Moon, how many times higher wiqa-x4 tg8v s9tpqyo(5ll it go than it would on Earth, assuming the same initial velocity?    $times$

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130#
 
填空题 ( 1.0 分) (组内37/46) 切至整卷模式 搜藏此题  
  A 95-m-long train begins uniform v5r871y gr:/w+fywrh n gjnz9acceleration from rest. The front of the train has a s wyg5r/9r jgy:17hvrn8wf+ nzpeed of $18 \; m/s$ when it passes a railway worker who is standing 168 m from where the front of the train started. What will be the speed of the last car of the train as it passes the worker?  (数值)  $m/s$

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131#
 
填空题 ( 1.0 分) (组内38/46) 切至整卷模式 搜藏此题  
  A fugitive tries to hop on a freight train tra vun )(ll5oje+veling at a constant speed of $6.0 \; m/s$. Just as an empty box car passes him, the fugitive starts from rest and accelerates at $a=4.0 \; m/s^2$ to his maximum speed of $8.0 \; m/s$. (a) How long does it take him to catch up to the empty box car?    $s$ (b) What is the distance traveled to reach the box car?    $m$

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132#
 
填空题 ( 1.0 分) (组内39/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the roof of a high building. v u,cdls( cp 3l-v0y/rA second stone is dropped 1.30 s later. How far apart are the stones when the seco dclv,s30vl(-c/ry p und one has reached a speed of $11 \; m/s$?  (数值)  $m$

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133#
 
填空题 ( 1.0 分) (组内40/46) 切至整卷模式 搜藏此题  
  A race car driver must aveqkny* 1qwm9 c-rage $200 \; km/h$ over the course of a time trial lasting ten laps. If the first nine laps were done at $190 \; km/h$, what average speed must be maintained for the last lap?  (数值)  $km/h$

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134#
 
填空题 ( 1.0 分) (组内41/46) 切至整卷模式 搜藏此题  
  A rocket rises vertically, from re6 pw-d0luqpk e1f r57amso3r( st, with an acceleration of $3.2 \; m/s^2$ until it runs out of fuel at an altitude of 1200 m. After this point, its acceleration is that of gravity, downward.
(a) What is the velocity of the rocket when it runs out of fuel?    $m/s$
(b) How long does it take to reach this point?    $s$
(c) What maximum altitude does the rocket reach?    $m$
(d) How much time (total) does it take to reach maximum altitude?    $s$
(e) With what velocity does the rocket strike the Earth?    $m/s$
(f) How long (total) is it in the air?    $s$

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135#
 
填空题 ( 1.0 分) (组内42/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the roof of a building; 1.40 s atc h5upauivc8 0 rw/ 123an. elp5uok+fter that, a second stone p0 e r3nlwipv/.u ac1hk5a 5ct2u8 ou+is thrown straight down with an initial speed of $25 \; m/s$ and the two stones land at the same time.
(a) How long did it take the first stone to reach the ground?  (数值)  $s$
(b) How high is the building?  (数值)  $m$
(c) What is the speed of the first stone just before it hit the ground?  (数值)  $m/s$
(d) What is the speed of the second stone just before it hit the ground?  (数值)  $m/s$

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136#
 
填空题 ( 1.0 分) (组内43/46) 切至整卷模式 搜藏此题  
  If there were no air resistance, how long would it take a freeplq6mxu 3yysbw b9,8gql u 7*)-falling parachutist to fall from a plane at 418us6q*pl um9yby) , 73g wxqbl03 m to an altitude of 350 m, where she will pull her ripcord? What would her speed be at 350 m? (In reality, the air resistance will restrict her speed to perhaps must lower value)  (数值)  $m/s$

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137#
 
填空题 ( 1.0 分) (组内44/46) 切至整卷模式 搜藏此题  
  Bill can throw a ball v /8uu .gzd/hzfertically at a speed 1.4 times faster than Joe can. How many times higher will Bill’s ball go th fuzg8du/ h.z/an Joe’s?  (数值)  $times$

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138#
 
填空题 ( 1.0 分) (组内45/46) 切至整卷模式 搜藏此题  
  You stand at the top of a cliff while8x l5w ;*ttsnq your friend stands on the ground below you. You drop a ball from rest and see that it takes 1.2 s for the ball to hit the ground below. Your frien5l*w n txqts8;d then picks up the ball and throws it up to you, such that it just comes to rest in your hand. What is the speed with which your friend threw the ball?  (数值)  $m/s$

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139#
 
填空题 ( 1.0 分) (组内46/46) 切至整卷模式 搜藏此题  
  Two students are asked to find the height of a particulfva pxs vgi1 09+*l(hpar building. They take a stone to the roof of the building and drop it off, timing its fall. One student reports a fall time of 2.0 s, and the other, 2.2 s. How much difference does tax sl+g* h9v0ppi v(1fhe difference in time make for the estimates of the building’s height?  (数值)  $m$

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