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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   总分: 98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) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to gy7hwz ; z.qep 8m.lq-another. Make a comparison between the we h.pzql;yz 8qm.7-gdisplacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the instao+hx8 y4pbja0jxvhgf:e;. : tntaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer f (crde0hv1yw qk)2*f advertises that their car can go "from zero to sixty in 8 s". This is0 q*(1fc2r kv)fhy edw a description of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis exper1pqw sc+,f-x7dul:hpiences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x d1fq;wsx,q)zn8 -xufjirection) begins to slow down as it approache;xuqjq1fsnw) xf -,z8s a traffic light. Make a statement concerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x direction) begins to ;x6bmmhd*ftgv21 pg6 slow down as it approat; b f6mm1p v6ghx*g2dches a traffic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constant velocity. Make a)t 421 ylnaf i5rapij5 statement concerning )1al5tj 5pyr 2ina f4iits acceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it mean that the accelerati jh4htc)04xw mon is zero? Support your answer with an hxmj wt4h40c) example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change direction when its a wdj5svra j62(g c6lum5ie3n -cceleration is constant? Support your answer with an2 dir5e5s3awg j6v6muncj-(l example.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constant acceleration. ic:2ekx*3ygn Make a statement concerning its motion with respect to timekc:2e ygn *x3i.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acce fqnq af7v151m a-4 w4 7wvd;jh6vzabgleration is decreasing? Support your answer with an examplbjad7ha7;5qf m4f 4-vnwq1wg zv6a1 ve.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smooth hill : 4or u7rg;xk5luuk/wof ice. Make a statement concerning its ack u5rlu4owx7 u/: rgk;celeration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the average of the objecf zp,l -,8fs hr1:fjevemo/ 1dt's initial and final velocity?jfo-p1,sre/ dvf1,h f8:zlem

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They bothd0ac qs jc 3hh::pnj wn2k25ji0qc:s/ accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objectqkj05hac2n3/sds 0: c jwn:cjqph:2i A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. They both accelerateth7ge. 3es .zu at the same rate. However, object A accelerates for twice thzse.ue7 g h3t.e time as object B. What is the distance traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest hydwata bxjv ft5/: . 1r3hx j*sv.mote+89g+and falls in the absence of friction, which of the following is truetw + /bt vm .:f9d x3j8e5 o1.agraxs+hyj*vth concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is reledz(6vi y7ib( h0j) p h50xctfed xr-1eased from rest and falls in the absence of friction, which of the following is true xeid0)i ydpc 1hhf5r b-0j(z(7xe6v tconcerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up.c;1 nuv-pr:k-*hgj: )/hdlejy jth+f Make a statement about the velocity and the acceleration when the ball reaches the high:j nj-*lykh;he- : g/)hcdfuj p vt+1rest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration just before it cr*wb1n(25t gz b -zdhsju*o3 reachszh djrt(gu*zn 1w25 o*b3b-ces its highest point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maxu. 1r;isuyq *td/ip2k imum height, then falls to its initial height. Make a statement about the directisru2iqt*pukd1/.;i y on of the velocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum height, then falls to its initioeswlwp.j;b/c6*b 3cal height. Make a statement about the direction of the velocity and acceleration as the ball is c; 6jowpbw ce/s* l3b.coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the absence of air resistance. Make k5 ;n )-xwoqqoyezp+2a statement concerning its acceleratiqxneqy +o2ok-5 w;)z pon.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying h70tgbzt w24z plane. What is her acceleration whet0 btg 7wzh24zn she she reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identical senziv-r ipx8 plxd uk 17:6x8t7cond ball is thrown upward with a speed 2v (twice as fast). What is the -7xxvxunlz7ptd88i:kip16 rratio 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) 切至整卷模式 搜藏此题  
  Ball A is dropped from tcl + s8qctc7jsmhf7 yg/n6u16he top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance betweens1ch/8c7+6 ytsn fmqu jl6 c7g them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, ballw)dt1ecsqoit eaqmf.) n5:x)-f ;uu :f:m ln7 B is dropped fr; qetmo fw)i-:1n nclde 5x mu.)u:atfq7)f: som the same building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top dv nn-,+x *ktolq/r.mw7e;crc:; 2 ac *ikalbof a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit k*7v2lr;xrwbdn ; occ tnke*ca-, ia:+/lm.q the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from t ) loi ,s(zybc03.ydydd+ s:wt ke+h9jhe top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accey:cz ijs0 w.o,l3 +y(b+ktd)e9s ydhdlerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with conphqzb xx8rjccq)4m c1k5 su /:al0-)dstant non-zero velocity in the +x axis. The position versus time graph of thcpku/hjc)ra bl1qsc)xx 0qm45z8 d-: is object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in t a qz.fuv:2q2the +x axis. The position v2z2vqta.fq : uersus time graph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. The velos;0f 4w9dsxbp city versus time graph of x4b pfd9ws0; sthis object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleratio d ;bo+) : jb9omcuplmwy-hp.9n in the +x axis. The velocity versus time graph of this object i. jbco wmb9d9 lu:ophy-mp)+;s

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus time graph gives,bl3 w1f5gq* sbgnn2afxf9 x(

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity verhz rudz6uep2v))6/tk sus time graph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versus 8juhnhejnz8.; w- t2xtime graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in a velocity versus os8csmw+ )n2o *m. imke. 2qphtime graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal line, the objec64bt s.kyk+: 5uxjvkat is.b:kujat5kv 4 +6 syxk

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an8*gdyk:znm w/ vpl . ;*x(sbou object is a vertical line, the object is;* vz. ( bdgkx*owm/pun:ly8s

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time grapg - x:pu:eqeb*h of an object is a horizontal line, the object i: bxu*q pgee:-s

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a straight line making a ekeb-7f.e h7sn angle of 30 degrees with the time asbfh. e-7k7e exis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m south. Find both thxps 8)ryh;)oq e distance traveled and the magnitude of ;o )yxhp r8q)sthe displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in stxzqzr 0otqm *0x+20z oill water. How long will it take to move 12 km upstreamz+qoq 0x zr2 0*0toxzm in a river flowing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (yh) ulv4 bw0)e1 mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in order to+j 9nb sz xj9umlr:3np99mt1q travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Wha6a. a;o exuf1( tmmm;ysqgu+.t is the average sf;yuu6gexat(; o .q1m.m + sampeed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take for it to travhvk :* c2xm7i* ;dnngeel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels in one year. The s-ibdypu5z9wg*k kg 7 +peed of light is 3.00 x 108 m/s 9k-i g+*zwgbkp5udy7. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 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 side o3u2gxn i37 bzfor 4.0 s, how far do you travel during this inattentn io3z3gub7 x2ive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop aro5u. k mtx(kn5sund an outdoor track (400 m), in 100 s, your average velo usmtn 55(.kkxcity is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole-(rq;u( cq1 ;tifu2gh;qpq 8a u9w uie. 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 sta 9;(aqhfc;8u rw2 et; -qipiu1( uguqqrting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south zld0ad i rx6)z9p.m)w, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip i d )z al.w)xzd9r0m6ptakes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from school at 55 mi/h xw4)zx5sm ss2 for 110 miles. It then starts5)ssm42swxzx to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 cin1qg 7e6aokig1)if;nq0 s; dm ;ro:km at 100 km/h. What is the average speed od nk7q1eo: 6q)ggmac ;;oi isr0f;i1nf the motorist for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 k js e ,g3 a(xlbyth- khu)67g:hrr.t7wm/h. What is her averagebahxgwh 7( 3tyljhu-7k. 6 rt,srge): speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h avk8us l .; qivn301btbnd then at 250 mi/h north for 750 miles. Whatbu;3n8sv.kb1t0i vlq is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorma e-dt1j hm.:wy,llrm:u3 n,pdn (the person who runs the last 100 m) for team A can jrn:p hw ludt,d13ym:-.el,m 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 team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comeszo4lvet *8*ikcujl)+; 9t (ihb:zi;hyltg0c to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What wz o*l tt)ghkc(:hvuz+l l;4 0et i*j ;b8cyi9ias the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average r : c-6vqrz, 3jackftw2ate of 6qrz,:t3 facvkcwj 2- $15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates at the rfs3kg m.mctma3e 70 x q44n/zwue:s-fate 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) 切至整卷模式 搜藏此题  
  A cart starts from rest and accelerates at pe(8lb9 u/l qx$4.0 \; m/s^2$ 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) 切至整卷模式 搜藏此题  
  A car travels at 15 m/szde f6. 1smf ocea.wwfl5l:/3 for 10 s. It then speeds up with a constant acceleration ofcsf1w6ewd ellzfa .:mf.5o /3 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initil;o r4hvs4 +v 9 nrio8*pxh2cjal velocity of 5.0 m/s experiences a constant acceleration ofco *h;s nri8j9o2r4vx4+ lvph $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x 5f,-sc+ iia5qc.d lk6.yjzc1 .hzov ldirection) with a speed of 500 m/s strikes a sandbag and pel zl oz+skh1c.,fci..cjydv- q55i6 anetrates a distance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraft cqx3ikh3 e(u gu0 2dbf:arrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assumin3hk3g(02e d f: qxuibug the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest moves with constant acceleraf530;x2icwqutjj6g e tion 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) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distal1)s4k1*s*n 6kz)gjckpzk fl nce of 200 m. What is its average acnk)k1f 16sgksz 4kz cl*j*)lpceleration?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. During the firsx1 ui1 a vrff:-1pvan*t second it travels 5.0 m. How far wi xf*r1va-n 11: pfivuall it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleratiqr2 s pq wj*+bzwpk( w94a*n)ion. Initially it is traveling at 16 m/s. Three secondpbi)a(w rzqq+*j wn 2* 49wkpss later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and accelerates uniformly at rhm+2m (py+sgg9 fl,m$3.0 \; m/s^2$. 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#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can f1l+d tdx::qm 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?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a trafblor , 2vc f.-wz:1wni-f :xm- rvq-dffic light turns green, a car that has been waiting at the inter2-nv,1z. r:- iwxw:-l-qfrob vm dfcfsection 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.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown uaqqg16,gqh b; pward with a speed of 12 m/s on the surface of planet X where the acceleration d h;qg1a,qq 6gbue 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) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 4yzw :ceuh :(bm/s on the surface of planet X where the acceleration:bwyhz e( c:4u 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) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 1sl9d5m6 /hsd x5 m/s on the surface of planet X wheresm/hddx6 59 ls the acceleration 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) 切至整卷模式 搜藏此题  
  An object is thrown uu e.)87ifj16cw, *y oihb bpxvpward with a speed of 14 m/s on the surface of planet X where the acceleration due j67b eh.ixpwob1yfu, *civ8 ) 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) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend holds a rub+avsxi8*e(8 0wa xqnler between your fingers and releases it without warning, how far can you expect the n8b08+v* xa sweiq(a xruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 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 veloca ;tq7 (,ajlvwity after 3.0a;q wjt(av,l70 s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns ta,s889 v ;fm ph7kktnxo its starting point in 10 s. What is the initial speed otp 8,9h;f8amsk7nv kx f the bullet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up (deqkege 31r0.gnzf- 4 nigd* with a speed of 36.0 m/s. How long does it take to return to its startin*g4d q 0irzfn keng-ee(dg3 .1g point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with an inn5(f/ofetfk 9(chr nsns-5;nitial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the bu(okrfs fhnfe-(nc95t ; sn/ 5nilding?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed s5m(5i 2r1mbhgly81w 6 vmd0izrqp5 bof 30 m/s. (only fill in numerical value in the5zq vbd0bwmg rm 8ipsi65(2ly1rm5 1h blanks)
(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 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed ajg 6;lam zx()g sk92ac45kfcof 30.0 m/s. (only fill in numerica9cx6a zgka(j)l2ak mf;4 scg 5l value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t = 1.x.jxrt*xse:3 0* i/ -j dvsg on08yzxf0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the veln 3g 7tvcmy, e4c/ly,9le e+dyocity at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the ve am1dxg wn. hl(0itx43+m7rfhlocity at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t ;2jazz i ,g2 mpkj;mm-1ncki3= 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity f3m -szc4w x8cqrom 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the asz p16:poju6 hlymlxh 3e-x80verage velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is thl9.)djhsfb-xx9 p /dm7jon g gd+7 ui,e acceleration at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accelx.xp8c7yql 2e eration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 to 5.0krc72xe ; 57iqh xz3eye w27lt s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average accelerappiax7y7 x+ ql9ak-0btion from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what isy(3rvag; /44paw:f(rcori0 8 pjeq sd the displacement from 0 to 8.0 s?


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