题库网 (tiku.one)

 找回密码
 立即注册

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp,上传完成后会在上方生成预览,用鼠标连续双击缩略图,或拖动缩略图,该图片就被绑定至本题,显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片,绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


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

标记此题
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 object travels from one point in space to anbu: 8v+l geynq,w(m1xother. Make a comparison between the displacement and the distance traveled +ye(1 qlnm, 8wgxuvb:.

参考答案:    

标记此题
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 instantaf*swhid7-9 wt6u xfkrkz2h3 -neous velocity?

参考答案:    

标记此题
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 car can go "from zero 9rr;q8xcp4( ;/+ po xur rtiibto sixty in 8 s". This is i xrq;pr(c/9+i;84bur ptxora description of

参考答案:    

标记此题
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 experien-lum6 j *sgxk-ces an acceleration of $2.0 \; m/s^2$. This means the object is

参考答案:    

标记此题
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 the East (+x direction) begins to slow down asyrj i53 ;ui),- mgb*yrgu*htb it approaches a traffic light. Maj3r * u ihb-mibry5*ggtyu;, )ke a statement concerning its acceleration.

参考答案:    

标记此题
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 West (-x direction) bega twlodw 3g7;/ins to slow down as it approaches a traffic light. Make a g3lwt7;ow/adstatement concerning its acceleration.

参考答案:    

标记此题
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 movi k-mk)hw8:j:p)y qka m3gxxzds 7j 72fng with a constant velocity. Make a statement concergh:wsk 3x pj7m:7 )f 82z kqdkm)ja-yxning its acceleration.

参考答案:    

标记此题
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 the accelerat9cyw 1fn4zsj 1+idz u5ion is zero? Support your answer with an examp1uf+d4z9c n5y iszj1wle.

参考答案:    

标记此题
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 chans:3c0n /vdfzxvl4t i 4z2u+n kge direction when its acceleration is constant? Suppor+ kznvtd sl /23iunzx0fcv44:t your answer with an example.

参考答案:    

标记此题
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 constant acceleration. Make a statey4o1 m6.fr(w7 xb/n h)ipjqdlment concerning its motion wixw4d 1rmopbl)j .fqyn( 6/i h7th respect to time.

参考答案:    

标记此题
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 while its ;pqew 9 bb,0o*lpd*daacceleration is decreasing? Support your answer with an*padole wb,d *qbp;0 9 example.

参考答案:    

标记此题
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 pdat 2g1h15b eim ga/ +d1+fc8jkas i1kick, moves up along a smooth hill of ice. Make a statement concerp1d e 1+/d+ibgs2ijg ha51k81f matcaning its acceleration.

参考答案:    

标记此题
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 velocity eqbjd efd xk/e(lk;z (:3ual to the average of the object's initial alde jz/ kf( b;k:ex3d(nd final velocity?

参考答案:    

标记此题
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 sta93tfjz fe (f; piszj3+rt at rest. They both accelerate at the same rate. However, object A accelerates for twpi;e+ zs9t(j3fj zff3ice the time as object B. What is the final speed of object A compared to that of object B?

参考答案:    

标记此题
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 start from rest. They bopfow7-ow.-:db si m0eth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objw bpio0df -7: mwe.o-sect A compared to that of object B?

参考答案:    

标记此题
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 fally,)-q (a9fpj 6pw baz8xedt o7s in the absence of friction, which of the followpjb 69a-)w xoatzpfd ,(e8qy7ing is true concerning its motion?

参考答案:    

标记此题
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 friction, whicj6q*/ zwy zmem7 3((.zhvwi g;er3y nttvk1d+h of the f(3+ht n1v/q 6yzz jimyezwkw .v *re;dm(7 t3gollowing is true concerning its motion?

参考答案:    

标记此题
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 the5uc(q r)a:ckn g2rq*6sdz*q l velocity and the a urglqcd2: 6z*5q*)rsqnakc(cceleration when the ball reaches the highest point.

参考答案:    

标记此题
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 straigh8. z/sni1rmf zt up. What is its acceleration just before it reaches its highe1z i.sznmf 8r/st point?

参考答案:    

标记此题
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 s2bcp g ln vml8/km.d61traight up, reaches a maximum height, then falls to its initial heightng8km/lp1v6. 2b dclm. Make a statement about the direction of the velocity and acceleration as the ball is going up.

参考答案:    

标记此题
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 asjy q6dj03 )dwts/m 6up, reaches a maximum height, then falls to its initial height. Make a state/dqst)0sj a y3m6j 6wdment about the direction of the velocity and acceleration as the ball is coming down.

参考答案:    

标记此题
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 ;6gai )3+av0ljp fvsmabsence of air resistance. Make a statementj3l6f 0sa+gp)i ;a vvm concerning its acceleration.

参考答案:    

标记此题
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 higu c*4*9rqu8z1zd- omw7wfsmw h-flying plane. What is her acceleration when she she reaches terminal velociu uwsc mzmd9w41rf8w *-7oz* qty?

参考答案:    

标记此题
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 ib *5 fg/ox)hdhd*.lt4dj0u yqdentical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the fir **lxtyddbh q4 fgud)o0j/5h. st ball? (How many times higher does the second ball go than the first ball?)

参考答案:    

标记此题
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 later, b+txa(ota w7e0all B is dropped fr+o t xe0aat7w(om the same building. As time progresses, the distance between them

参考答案:    

标记此题
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 5o-ons*v(+jtiawf8*t0 bx de top of a building. One second later, ball B is dropp n(5 -*aos+wtexbij*f08votd ed from the same building. As time progresses, the difference in their speeds

参考答案:    

标记此题
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. On7s+ bd*n oxrw/e is thrown up, and the*/bo x+nr w7ds other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

参考答案:    

标记此题
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 a building. A second brick is throwzqrvy -p9vqa2 4a 0p v8k4bn.dn straight down from the same building. pq4yvbd0 -v 8q29kvr.aa4nzp They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

参考答案:    

标记此题
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 with constant non-zero veloci/h /hc,us (yslkbn7,/v,ishity in the +x axis. The position versus tims,7,skh i huy/(l/vnh,si/bc e graph of this object is

参考答案:    

标记此题
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 acceleration in the +xu6l a9f+y/ im3lqw+q k axis. The position versus time graph/mqwuaf3ll ++6yq9i k of this object is

参考答案:    

标记此题
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 ven3;oz jjn1 jv8locity versus time graph of this obje1v;o3jjjz nn 8ct is

参考答案:    

标记此题
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 constsx)ocx:me;;4mf z h9a/( o pjqvvp,/iant non-zero acceleration in the +x axis. The velocity versus time grsj/;4p)(e,oav p cfzi mq:ox9/v;mh xaph of this object is

参考答案:    

标记此题
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 graph giveyho(uzj q3 ,e5s

参考答案:    

标记此题
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 graptot)- h np:yei,z :zn-h gives

参考答案:    

标记此题
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 tim/qvn6 h.c,xth t*-utf b6 8ucue graph gives

参考答案:    

标记此题
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 velocity v0trbu8 7xn aq6ersus time graph gives

参考答案:    

标记此题
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 horizqb97)m.t s ngeontal line, the object 79m )eqtbsn.gis

参考答案:    

标记此题
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 li6 .jnsxqd+pl3o1 k;sdne, the object isq6k 3;lsdnjpd+o1 s x.

参考答案:    

标记此题
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 object i2kgm uzju/o;1 ):bg cds a horizontal line, the object ijkoubc :/2)gg md1uz;s

参考答案:    

标记此题
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 i :xw8m(n5 y5na5hswl,xg6udof an object is a straight line making an angle of 30 degr i ly(8ngx u6awnm,55 w:hd5sxees with the time axis, the object is

参考答案:    

标记此题
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 then 11.0 m south. Find both the distanxlhou *+8c n8jce traveled and the magnitude of the d*+ cuho8j8n xlisplacement vector.

参考答案:    

标记此题
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 water. How long will it ta2 rv;(c.pwdu yd2fks(d, z)jj ke to move 12 km upstream in a river flowing 6.0 km/cdyufs ,dw( r v)2(.d kz;pj2jh?

参考答案:    

标记此题
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 mi = 1qk 8 fzdc.28ta:f 7xwf609 m)

参考答案:    

标记此题
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 order toap *u0x0baoq4j7ob v7 travel 350 km in 5.15 h?

参考答案:    

标记此题
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 marae9zb+)h fv2 ezthon (approximately 42.0 km) in 2 hours and 57 min. What is thvez92 )ebzh+ fe average speed of the runner in m/s?

参考答案:    

标记此题
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 it to travel 4006i;.mjslp ps 3 km?

参考答案:    

标记此题
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 1k+c*q-55d xzssphroin one year. The speed of lig5so1h kd5c- pzxr*+ sqht 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.)

参考答案:    

标记此题
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 al k70olu z mn 1z4qhdxh/**:qavv9brt -ong a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive p*lh q7h:0kv1*m bzxatduov 9qr/n4z- eriod?

参考答案:    

标记此题
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 /c w):6l cys()6kmgkzvrqw/qan outdoor track (400 m), in 100 s, your average velocity i6c vl/mq: /s6 g)qkw wc)rykz(s

参考答案:    

标记此题
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 south, 1utu)49 tb erfthen 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. What was thf91 rtb uu)t4ee bear's average speed?

参考答案:    

标记此题
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 Pole. It travelse zla*apfjc+0l( dd2y)./s ch 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 trip takes 45 min. What was the bear) le+ z 20dsfjl/ypha*a.(dcc's average velocity?

参考答案:    

标记此题
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 wc :h+4qh5d) tnt;/ n1wsf qbejeekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutesf/jt 5nqw)bdehqs;tn+ 1 h 4:c. How far is your hometown from school?

参考答案:    

标记此题
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 is tib14(9 hw)7b cp ykivghe average speed of the ghvw)i4ypbi 7 1b9k(cmotorist for this trip?

参考答案:    

标记此题
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 3.0zy-94, ahu emnr2g e,ryi75xz h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tn hzr7 ug ixmz29ye -a,y4r,5erip?

参考答案:    

标记此题
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 mitai )gw94 r2fx/h south for 2.00 h and then at 250 mi/h north for 750 f)94x2r iwatg miles. What is the average speed for the trip?

参考答案:    

标记此题
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 th3 gkk+ni8:j /umi+znte last 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, it+zn/:k8+ mi3kgijn un order that the team A runner not lose the race?

参考答案:    

标记此题
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 to ak**a1 knv5ebjkc1f5 6qc9ep j stop after 14 s. The car's average velocity during deceleration was 40 km/h. What was the cb*kk5qc1 6 c1jene 9pkav *j5far's deceleration while slowing down?

参考答案:    

标记此题
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 speedoq+ q +8i.ra.rb.u xd( fh/ t-htnh/td from 100 m/s to 160 m/s, at the average rate of aqfob -r/ .+(hnr ttuhiqd8/x..dt h+ $15 \; m/s^2$. How much time does it take for the complete increase in speed?

参考答案:    

标记此题
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 h ef81bcmip 8jo.p3rxv-s y0(rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

参考答案:    

标记此题
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 acceleb )..gqegfbt dxw753 erates at $4.0 \; m/s^2$ 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?

参考答案:    

标记此题
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 fo v-xyl i)2)2t iobq auow;8us(r 10 s. It then speeds up with a constant acceleration ofw8y i 2atbluovqx)o(s i-)u 2; $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

参考答案:    

标记此题
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 1.7 m/s experiences a co8dq(cqg+4 o jsnstant acceleration of cs(gq4+oj8qd $2.1 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

参考答案:    

标记此题
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 a,j 1i1c/ei/ n-6fbpspy*ipf) with a speed of 460 m/s strikes a sandbag /p1*,ibfie 1nfyp-j6 cisa/pand penetrates a distance of 81.69 cm. What is the average acceleration, in $m/s^2$, of the bullet?

参考答案:    

标记此题
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 launched frq/)n8 h* i4tufk(kxv yom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, whfvx4k/ q*i nt( k)u8yhat is the length of the catapult?

参考答案:    

标记此题
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 rest moves witht 4z *mo t/3l c5sk-5e0onfmbe 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?

参考答案:    

标记此题
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 tphvr, voq-3:n 3*/ osxen,v6h;rg lyko 80 m/s in a distance of 200 m. What is its average acceleratioln er6/-* v,vrvh; oxpk:nyq,3h so3g n?

参考答案:    

标记此题
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 unifol(t yluhe8t )s 1i:l7crm acceleration. During the first second it travels 7.2 m. How far will it travel during the third sh:ltl yl8e 1(ut7)sicecond?

参考答案:    

标记此题
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 c lyr nfwqx1x,bx:c/vf)kg u(a2-3b l7onstant acceleration. Initially it is traveling at 16 m/s. Three secolr fxf xayk l3:w/cq17) (2bu ,-bvnxgnds later it is traveling at 10 m/s. How far does it move during this time?

参考答案:    

标记此题
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 accelerates uniformlk.tgp/ nvrm h .1afx44 ;b8kxzk8xi*ly 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?

参考答案:    

标记此题
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 road can+vex b3-eb:xim3 f) z j;zi)yz 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)

参考答案:    

标记此题
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 thaxzx4)/g4i s mog6q.ge intersection starts ahead wio4gxga6i sx)./zm 4q gth 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)

参考答案:    

标记此题
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 u+*o rhio4f7nh+ef+9qh( vu ogpward with a speed of 12 m/s on the surface of planet X where tf(hoguhfh4 ri9 qe7++*o+ nvohe acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

参考答案:    

标记此题
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+rg9g.ey pis./*ce j l m/s on the surface of planet X where *+g l p ry.e9siegjc./the acceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

参考答案:    

标记此题
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 15 m/h95zf- jdnwoktt8p xr3z l+).s on the surface of planet X where the acceleration due to gravity jz+hnkz -wtldr) .3 9poxft85is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

参考答案:    

标记此题
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 upb1frf1ss3p 1b,u3f3 vb 5y0c c2kkfml9to/hrward with a speed of 14 m/s on the surface of planet X where the acceleryc 3m r1b9o1fsfk2b1,t/3fv3hlfs 5 0ku rbcpation due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

参考答案:    

标记此题
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 your friend h;o+n m z8p01+x agpkgqolds a ruler between your fingers and releases it without warning, how far can you g+kzo pqp8 a;0ngm+x1expect the ruler to fall before you catch it?

参考答案:    

标记此题
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 pxk,/,wsnle n m,: jh5velocity of 19.6 m/s. What is its velocity after 3.l,n wnhj5s xp :,k,/em00 s?

参考答案:    

标记此题
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 11 s. What is th6d0;1yr t qvtt r7ihl8e initial speed of ttli rv706;d8q tryh 1the bullet?

参考答案:    

标记此题
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 sp07tb 6ja ro;roeed of 36.0 m/s. How long does it take to retab60jtrro;o 7urn to its starting point?

参考答案:    

标记此题
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 downward from the top of a building with an initiad0jdnc8 2zq)x l speed of 5 m/s. It str nxz8d)qj2d0c ikes the ground after 6.6 s. How high is the building?

参考答案:    

标记此题
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 j1, fs; 3gi(j iajfmn3m/s. (only fill in numerical value in the(1,mignj3 i; ajs3ff j 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?    $m/s$

参考答案:    

标记此题
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 strap,47j8 x ijotaight up into the air with a speed of 43.8 m/s. (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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

参考答案:    

标记此题
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 the )g0n;.puzrrbm4, tol 31yzcuvelocity at t = 1.0 s?


参考答案:    

标记此题
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 td4 i 2y1flxug3 = 2.5 s?


参考答案:    

标记此题
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 velocity at t = 4.0 s?vfuqf (wj 1hg8y0 i(.h


参考答案:    

标记此题
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 velocirstzp. v a9mz2majcuh9x 5p:,(0og z0ty at t = 5.5 s?


参考答案:    

标记此题
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 avero gfs0k7 rj9)ks3ydiw1 xh (.xrsm*;kage velocity from 0 to 4.0 s?


参考答案:    

标记此题
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 average velocity from 0 to 6.0 pin:8f hg0mxu lm,o;vfk0 ,-ys?


参考答案:    

标记此题
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 acceleration rnlot bden)74 k/ua6 ;at 1.0 s?


参考答案:    

标记此题
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 th)j(l t gbonktc+;z 72ne acceleration at 3.0 s?


参考答案:    

标记此题
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 the average acceleration from z8; h: 1inavx x4f) yptts.-jy0 to 5.0 s?


参考答案:    

标记此题
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 average accelexfnqc / p;o:wcq*0*n qration from 0 to 8.0 s?


参考答案:    

标记此题
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 displacement from 0 to 8.cjw0ev k gi3m7c ( 1ti.t6iay(0 s?


参考答案:    

标记此题
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?1.ew. x9umi2 v2avvvs {speed|velocity}
参考答案:    

标记此题
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 velocity is con-ztsk ;b u+4cu20idqyvj so 6-stant.

参考答案:    

标记此题
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 ,6(cmtphegt)s; m9a8r4yxgs its acceleration is positive.

参考答案:    

标记此题
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 greater speed than a second object, tb4h4eebvm /l lh1s v-(he first must have a greater accles -hbvvh1em (b 44/leleration.

参考答案:    

标记此题
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 tuf p c/d3be0e p0nq6+sfnnel. 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.

参考答案:    

标记此题
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 inc- acd 0p(ez-vnvbkz 1)reasing in speed as its acceleration decreases.

参考答案:    

标记此题
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 s7t(0+ilfnxv*a 6*kbc bkyrlho6o8 jmvu g - ,)traight up into the air. It leaves the bat with a (iluv7h ky,c**)rjb-vo 6oaln+gbmxk8 6ft 0speed 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)

参考答案:    

标记此题
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 objecol f6yl g0rc5.a, r4rqt*r:urt speeds up, what is happening to its acceleration, how does it change if airrlrfrr:r,o 5l.c6a uy0g* 4tq friction is ignored?

参考答案:    

标记此题
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 7hwj e1*r. n0qjun; ryobject speeds up, what is happening to its acceleration, how does it change if aiynw.7r jn0jh1q u ;*rer friction CAN NOT be ignored?

参考答案:    

标记此题
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 original p*ftna peu fay+6(fl .8osition with the same speed as it had initially if air resistance is negligible. If air resiyfaf fea8+un .(lt6p* stance is appreciable, how will this result be altered?

参考答案:    

标记此题
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 velocity and nonzero acceleration atufm s l9bwp+c:cii :-1 the same time.

参考答案:    

标记此题
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 sams )qku yd-:m+vg bhn8/e time.

参考答案:    

标记此题
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 fifthh,5bpg3d k0;bxqa1fr floor making no stops along d1frb5 ,0p; aqg3b khxthe way has zero acceleration all the time.

参考答案:    

标记此题
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 f1:lp+bzo+mkc 1k w/3t4e xutbrom $x_1=2.2 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

参考答案:    

标记此题
108#
 
填空题 ( 1.0 分) (组内15/46) 切至整卷模式 搜藏此题  
  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

参考答案:    

标记此题
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 arfknlb- h (bk5xq yj;. ufb2wl0yf)1s4ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

参考答案:    

标记此题
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, moving 110 xb o)yxs,z)9q m away in 12.7 s. Itx qsybox,z)9) then turns abruptly and gallops halfway back in 4.8 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.

参考答案:    

标记此题
111#
 
填空题 ( 1.0 分) (组内18/46) 切至整卷模式 搜藏此题  
  A car accelerates fromovhl3f3xyqd;*z g 68y $12 \; m/s$ to $23 \; m/s$ in 5.6 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

参考答案:    

标记此题
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 /rie1k5*r suqn;e 6c k$21 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

参考答案:    

标记此题
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 gc;ay5xd9hj6 snt4 .vspeed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

参考答案:    

标记此题
114#
 
填空题 ( 1.0 分) (组内21/46) 切至整卷模式 搜藏此题  
  A world-class sprinter can burst out of the5c4y; 7qu oqf trgm1cy5f4 x9gkr-/u j blocks to essentially top speed about qgcx4- yfrkfo;m4u5jt/r5cu9 gy 1 q7$10.6 \; m/s$ in the first 11.4 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)  $s$

参考答案:    

标记此题
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 speed 42vcp xqvy94wof $19 \; m/s$ to rest in 5.97 s. How far did it travel in that time?  (数值)  $m$

参考答案:    

标记此题
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 leaves skid marks 92 m long on the highway. lj,zor jm ogns1 +(qp25bu/p4Assuming a deceleratio2jg1np+sl bm j4 r5,qu( oz/pon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

参考答案:    

标记此题
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 tr9pa-cd cki zjj:c2,( zuck going $25 \; m/s$ 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).    $m$

参考答案:    

标记此题
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-mwbnpnl50y 4b+3 w3hwoigh2 b;3tv*lj run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelel3pnb g+jho42w iv l3wn0 ;5* b3thybwrate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$

参考答案:    

标记此题
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 top of a cliff. It hits the ground below after(vmw7s6bkw*.hoa** hzv*xv ddzth (, $2.76 \; s$. How high is the cliff?  (数值)  $m$

参考答案:    

标记此题
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(wf5q xa; 0hdr took a stone to fall straight down from the top of the Empire State Building (366 m qwxrf;ah50d (high)  (数值)  $s$, and (b) its velocity just before landing?  (数值)  $m/s$

参考答案:    

标记此题
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 q,s6v 1vkdf/2n-;xi rx d v( wuzs9ew5into the air with a speed of $20 \; m/s$. (a) How high does it go?  (数值)  $m$ (b) How long is it in the air?  (数值)  $s$

参考答案:    

标记此题
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 2.6lmj m/h4p f*b9 s after throwing it vertically upward. (a) With what smfl 4bjhm6 */ppeed did he throw it?  (数值)  $m/s$ and (b) what height did it reach?  (数值)  $m$

参考答案:    

标记此题
123#
 
填空题 ( 1.0 分) (组内30/46) 切至整卷模式 搜藏此题  
  A helicopter is ascending vertically with a speed of 5gfvck1l h5p2; mk)v p$5.08 \; m/s$. At a height of 77 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.]

参考答案:    

标记此题
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 upwa.8n s m im8ykajvx,gvhr,p9*6rd with a speed of $18 \; m/s$. (a) How fast is it moving when it reaches a height of 10.6 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)  $s$

参考答案:    

标记此题
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 0.16 s to traout 6rgxmg37uh: / if)vel past a window 1.9 m tall. From what height above the top of the window did the stone falxgf)7mo h 6:grut3u/il?  (数值)  $m$


参考答案:    

标记此题
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 albyhis2tx88(b0 -qjq sea cliff, and the sound of it striking the ocean is heard 2.9 s later. If the sqjtlhyi0bx882s-(bq peed of sound is $340 \; m/s$, how high is the cliff?  (数值)  $m$

参考答案:    

标记此题
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 vertically6.v zvsx33spfqu (4 qclpz13jkh4z*k upward with a speed of $11 \; m/s$ from the edge of a cliff 47.2 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)  $m$

参考答案:    

标记此题
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 upward by someone k6m;ip7io.t h gl8v+y on the 9th floor (28 m above the street) with a vertical spet; 7kv .6opi8mhgyil +ed of $9 \; m/s$. 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)  $s$

参考答案:    

标记此题
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 gravity1h0s+ ;bbafnn on the Moon is about one-sixth what it is on Earth. If an object is thrown vertically upward oba0snf1h;+ b nn the Moon, how many times higher will it go than it would on Earth, assuming the same initial velocity?    $times$

参考答案:    

标记此题
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 acceleration from rest. The front of t (a;8 .ecjdqrahe train has a 8;cre(aaqd.j speed of $23 \; m/s$ when it passes a railway worker who is standing 129 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)  $m/s$

参考答案:    

标记此题
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 traveling at a constant speeds8zw3wp 7x,qle lb k;8 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?    $m$

参考答案:    

标记此题
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 aisz* nh-ut4u 5 high building. A second stone is dropped 1.48 s later. How far apart are4uz*i-tn hus5 the stones when the second one has reached a speed of $11 \; m/s$?  (数值)  $m$

参考答案:    

标记此题
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 avera(gu75tlc 7 jfs usw*1bge $200 \; km/h$ over the course of a time trial lasting ten laps. If the first nine laps were done at $187 \; km/h$, what average speed must be maintained for the last lap?  (数值)  $km/h$

参考答案:    

标记此题
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 rest, with an accept 4 kca ;4ynica)4efj;9h1nkll 20jz leration 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?    $s$

参考答案:    

标记此题
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; 1.33 s after that, a seconw/t (0wwpk8ji3m4 n-fx;fjwnd stone is thrown straight down with an initialnjm w4-xfw( 8nt jw;/0iwpk3f 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)  $m/s$

参考答案:    

标记此题
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 woutf v:2xj;. zsjxcc67-smdbue2/oe;pld it take a free-falling parachutist to fall from a plane at 4675 m to an altitude of 350 m, where she will pull her ripcordox2def.cuj:cz2mx bp6j s t v;- s/e;7? What would her speed be at 350 m? (In reality, the air resistance will restrict her speed to perhaps must lower value)  (数值)  $m/s$

参考答案:    

标记此题
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 vertiy e/9bt-2f gcrcally at a speed 1.2 times faster than Joe can. How many times higher will Bill’s ball go than yg92 -cf/brteJoe’s?  (数值)  $times$

参考答案:    

标记此题
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 while your friend sq(pp:zqn7vb: be*c1 c4l,oc i tands on the ground below you. You drop a ball from rest and see that it takes 1.1 s fo bnp7:qc, pcc l1vq biz4e*(o:r the ball to hit the ground below. Your friend 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)  $m/s$

参考答案:    

标记此题
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;ix(.e7syqud find the height of a particular 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 the difference in time make for the estimates of t7id(uqx sey .;he building’s height?  (数值)  $m$

参考答案:    

  • :
  • 总分:149分 及格:89.4分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题,此次习题练习共有 139 道题
    本系统支持习题练习,作业与考试三大模式,作业考试自动评分,成绩排序一键导出,可设定动态变量同一试卷千人千题
    如果您对本系统感兴趣,想加入我们或者想进行任何形式的合作,请加微信 skysky1258

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2025-6-9 13:43 , Processed in 0.804315 second(s), 303 queries , Redis On.