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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test60.html
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  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  
  What is the correct unit of work expressed in SI un 4w d6pz5(ej*efp,xd lits?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is nv5uglc 1n44lm .qv 9rj,t zqw74xx.pho motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard g yz u1u2h:f) 7uj7l-bzdurz.against a stationary brick wall, the amount of work you doj1 7)yf: lz2zhuu-bg.zr duu7

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifte*,x ofyrxyxo( 6 hyl4/d 2.0 m vertically and is being held there. How much work is being done in holding the box xo/y (x4hfl*,r6yyx o in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a consnw2g99h9;ls a y tkz(ptant velocity carrying a 10-N object, the amount of work you 9hnl9s 2(kg9a;p wtz ydo is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m.) m,5bldnivcmr2- p rhxj5e3e4xv: m then returned to its original posir c5v) e 2p3lmx5vixn-:,rm.4j mdhbetion. If the total weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal fh4u)czock pvg 5ns/ )+orce acting on an object do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare tz8tfkyw 9w*c 1a;o:fe he sign of the work done by gravity while the ball goes up with the sign of the work done by ;k:t9e cf81yafozw w* gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versxzp3rrb* u5fcqi)k 6m 9*7ro )+ffwssus position (F vs. x) graph, representsf7)qw 5 6k*sx r*zmf39ipros)bu crf+

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position oag/,l4u*wry:( i upr(F vs. x), what represents the work done by the force F i/plwy:u ,arr 4(uo*g?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, then the6/b7jgd 3kzji .cm r)j object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done l ckwv5/ ha4ii3+*hgk yvxi89on an object is negative, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is ak5x( ec co30;6k: gro oalz(kzero, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice asff)bun mgaz(3t;4t z. much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to tt.zgn )m;ff3 tu(abz4hat of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car Kh4.u e4 gr9*bo;p chaq. The kineuch.pg oa bq 4;r94*hetic energy of car J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. What is4/feq za)mg2 o the ratio of the final kinmgazf2e q/)4o etic energy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is mo0u-u u5)nzg6 p(erwal ving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ra regu(p)- ulz0nuw5a6tio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with spn4rw(ez9ktidazb ;6a(htx sm 80pp+1eed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to res(db zp4r8hnwi xzmaas61t0 ;(9+ ptk et. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a certain distance on aegs w:)0z;b7oh vc kk,r/la )y straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditio,h ko/):krz 7g;y )bw0slcveans?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an elliptical b2hf f3hx (sme 1fh4m ov24n3corbit. Neglecting any frictio2f1ch(f v4mx 3n homefsb4h32n effects, what happens to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy pd(yae( vi /q1c7zdf tfx )pu67rinciple.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have nega2c6lljycq(gqo6g 4 l8 1d: abvtive potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the ground. A se+sxfg,a)xtg3 um*kj yi.-n 3pcond object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the fir,nx - +g3gkau3) p*smjt.fixyst is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attac(h+xcv vvkh( 6ldon1;npk :. ihed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will x pvik h(k:nvdn ;hol6 +v(.c1be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy of .fr nvgzn59t*a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kined8q2)mbd+ni.:/jm rnp/lg jjtic energy K, to its potential energy Udbgpjn8l .j/jq/ :m+ n )id2mr.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car driving up a sn3c4g n/-hlw 5w 8)k kfatyc2hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and 4 *yh)xkcs- ima very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises cki* sxm4yh) -to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses p 0dor5)ikz8d $m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of conservation of muwxco1 x yq//-echanical energy for conservative forces-uox/w1q/c xy .
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the air (air friction is f t110 cu2yk(n7zb/vp+atxk+)ubccx present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of th+c/tb1nzax bu2xy pkft 1 uc0 7(+vk)ce building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and g-u axibiupvb 37* ,8goains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did tpx8 3 ,i ao7*bgi-vuubhe ball lose?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and loses 30 J 3e z 57)i.o8iowkukqt of gravitational potential energy. Do not ignore air resistance. How much kinetic ene.u kie oz8qi5o3 tw)k7rgy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of3j ah4mc85 +8pj cmxd*fwr5uc energy.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t issv,c-i.38 gjnfvjk8 p 8ap-cg

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unitn+x w ztsz:r70 of power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whichw ;p;l*o)t:5yvbvmm3 junx s4 is not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did q6d yg xlvud xmqmd 747i6*n6kaj*y4+3 times the work in one-third the time. To do so, your poixmudxv7ynm6*lq44a dqk7 6+ g 6* jdywer output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car *dni3x yf,f fetn.kt12r b)x)at a constant acceleration, the car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertica-g ,yiy9qqvo:5g1dg,xn+ kly vv0c a/ lly 2.0 m and held there. If the object weighs 90 N, how mu,qvy vg adl9v n1g+-cyy/50xq o gik:,ch work was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physic t:xby3ni nqnm823da 0m4wxy:s book up in the air a distance of 1.0 m, at a constant velocity of 3x3d 2y8n0nnt:wb x :mimq4ay0.50 m/s. What is the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of x: davmcz5 oc.;a-k 68bku+w g5500 N for a distance of 50.0 m. What is the work done uk g +dza v;5c- wcmxo:8a6.kbby the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled3 rj ,iydh,muk qyf+*vl66hd* upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight oq udh h +m*ydlf6v j3ry,,i*6kf the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N gpmpzq o2-zp68mn f)dlbq / -3for a distance of 50.0 m. What is the net work done ozgqmd- lo 2p8p6-fb/zp 3 mnq)n the elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up3ajy*q*x1 wd1r*jua g along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 orcv*n;p* g;fm down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on ani3m ku7 o.8jvn(idl+bv9+il d icy surface (assume no friction), with a force of vn9d.i i++d8 kjl bvlmio(u73 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the kw- zms fp-.p-x8c2 grforce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the ob2 gp wmzrx-cs-8pk.f-ject moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6wh v- )jfu6s/b-1 shows the force versus the object's pjvwfu/hb 6-s )osition. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction ofo:3a d9w (nqxyers1/wx+b7 hv the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mrha:b1 yw+x3eo/qwv7 xn( ds9 oves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in a 2sxr2pkd, 2gFig. 6-1 shows the force versus thx 2srad 2k2g,pe object's position. Find the work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg ca p4j.q;ye-waw rt (initially at rest) across a 10 m level surface. What is the f.pw jq-eway; 4inal kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initially wxr9f4onm05y fs 7gx- at rest) across a 10 m level surface. What is the final spe7ngy 4fm5xo0 fwx-9r sed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required to sw2l6cxyk +/7c.9xvfz -*ir wf e *vqjhtop the mass?x+yq-c/ 6lh9fr j7v wic**zvfw ke2x.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initiux/: t2.y kwuef 6truk9q 7v(hally moving at 25 m/s, what distance is required to stop a car moving tf wh/ k2.(qe6uk u xu97yvtr:at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a forcz g6*ufzl4ig9e of 20 N over a distance of 5.0 cm. With what spelzg4f9z6g iu *ed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a 1pkfdr4d3 2: ,m2 /+jf. szxtcnbjzfevertical component of 60 N. The force is applied to a box which rests4 t md2,ezf cf2ks1xzp dfjb3:r+/jn. on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizok ke5y:rs b;)ontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping sbey5k):rk;oforce acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to a hb)fj3t,.2ctwdm .wup eight of 13.0 m above the floor. What is the change in gravitational potential en,2j p3).uw.tdct mbwf ergy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plani ob6f.q4iit(5eeh;ch /ha9 1 f 4kucle is 4.0 m long and rises 2.0 m. If the plane is frictionless, h.6lu4e1 chb;9ihk/(q5f iiea4c o ft how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretsk-sq/ws o-z7u l f5a-ch 2.0 cm. What is the spring--ws lu -z5/q7ofak ss constant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m.r-pv6hb6 aq z5+cupo v.:n 3uo How much potential energy does it store, when stretch rbo v unvo6-puh5:a+zqpc6.3 ed by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to co)ew9nt qxg4n/ y;7 ./pqpxmds mpress an initially uncompressed spring with a spring n.ye px/)xq4nw 7q9/g t;spmd constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretzpv-st.46n pk ch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = -k 4vp.sp6ntz 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressed by 3.0 cmvygni o 9 d4m-+ogf)w5x7 eqk2,6he zj. How much work ize,79-+fmg)v24h key oq 5wj ix6go dns required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from r9rssa nz4t-. yest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Ne-ysz9starn . 4glect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushzafv 4 (9;+kceoblrj9es off the top of a hill with an initial speed of 4.0 m/s. z kc9r4f;j eb(va 9+olNeglecting friction, how fast will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frichhbq:o q3()kii* h pg+tionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of t g b+ihi*q:q)3(hhp okhe plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m above the fyl2t-y1nv qxkn*o5a :loor, its potential energy exactly equals its kinetiqoyl*axvy: 2 k 5-nn1tc energy. How fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level with is+6r 8c e:nua.y gf-pa kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical ene:6n esrc+ .8aifu-p gyrgy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of 220 J. At*ck5j jejb/8kad+ hk3 the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did 3 j8k*baj+cd 5k/ ekjhit rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts froz89t2v r 1ggrqm rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, w1r r8zg2qv9tghich is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a b+u:bxszi2 x,point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, whsxbu :z b+2x,iat will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of a dip with a s /rw nj8fc) ud/rnfdqm4gn ,71peed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the rjw cfug rdm)/1,n74/8nfndrq oller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its swik +g *lc/cxv,a q,4zn/quxx n(ng (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from tga p13gn6b0vf b6(vk*at gz 3rhe vertical axis and released from rest. What will be g6 b63 fg b*v10a(kp3nrgzav tits speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncompressed horizr (j51 0uz0a+pukapwzontal spring with spring constant0 ukz+r1pjz (up0 wa5a of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car pwo4i(,hbx 7x to stop for a red light. What work is done by the friction force againsxp i7ohb w4,x(t the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force bevwvfxut izoupz ubuy4h; 1 :z .)-1,z*tween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the ob * 1u1u,bx :z.zyovtihwuzv-z) pf u4;ject is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rjpwx f217vs k(ough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N.vp(2 j7w1xf sk How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg mass2.dqi:.h+d ) zweohw r on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic eneo:ed h hq)d+.wz2.wirrgy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier startssmibs yuc s,99 ,q9m2e from rest from the top of a 50-m high slope. If the work do9,9uq i smsy,9smc2ebne by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 m long an irs(2p5( 7ugpv-gcsyd rises 2.2ys7i-s ( 5ucggv(pp r0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a2 v6a2+i0 y8jg0uxf ufzwbh :o plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What fuu8bf62h+xvj wa20i gzy: 0 owill be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and strikes the2hj y9),zyw lmx1,w za ground with a velocity of 7.00 m/s. What average forywa ,19l ,hwymz )j2zxce of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy czqmden2spjfu6ey4gk*) 6c8 e 7k6-v when he runs up a flight of stairs 10.0-mdn upk sc6 -jcefqmz*4eye v 2g)k6768 high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a consta;t s4k7ecuj--qthfds n9ed h+/ 8f 4yant velocity of 5.0 m/s. What power must be delivered to the object by the forcesf t+447nedqk-hyde- ;9j/cu 8fsath ?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy hz81 bu:prutk73hbi 1um4 h 7sare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = :1b p 7uhtur k7smzuih4h1 b38746 W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while ridingwr3o95 ult9 ry. How much force does her foot push with when she is traveling at lu9w9ryo3rt 58.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. Wh0c 3 ppm/7wokbat is the average power delivered by the engine?k3pbo7/0cpwm (1 hp = 746 W)

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