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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 u .v3co9f,jb*6:qaug *qles wl nits?

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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 no motiom.e sap,xf7t*p h8k .pn?

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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 against a stationary brick wall, the amount of work yocn9 k)9( ysqhm1w4vx tu do9m1 hct(v kq nyw4)sx9

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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 lifted 2.0 m verticajbcn547d no1v lly and is being held there. How much work is being done in holding thc1 n47do5b njve box 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 constant ve6x -.nvtjsxa.g/b; gb locity carrying a 10-N objecbgx- xn;tgs. 6bajv/.t, the amount of work you do 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 tf5vdfe r.;2f ehen returned to its original positio5f frdvf.;ee 2n. 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 force acting on an object do work on thv8.qkf ( oss;ze 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 the sign of the work done by gravitbyg 6w038 kpuky while the ball goes up with the sign of the work done kk83w0 b6 pyguby 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 versus podwxurfloou7n* ; +isy+)jb;;sition (F vs. x) graph, represents;uo u)fsbil;;r 7x dn y*wo+j+

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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 (F vs. x), what represents the work done by tw 3 i287kgq;*y* jnx yv.kgtfkhe force Fy xy qg*2fg*kv7 k;ni8 k3j.wt?

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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, tho3ysq+o fue sf zr(1a.h03 b;ren the 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 on a.p s yddlm7 i*.46oriln 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 zero, then the ob zb/ y( bzk+ss rq;3j7q4j5jkpject'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 as much as a car, 1f): l79wrzs-;pamftk7,8zbj z:)osiam koo and is moving at twice the speed of the car. Which statement is true about ;a)zs zjop79,ok zfobmsr w:8)-t7f 1lk:miathe truck's kinetic energy compared to that 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 as7ptol2f tc 04l 0e:jthe mass of car K. The kinetic energy of car J, compared to car K isfpct0t 7: 4se2o0 llaj

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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 wiasjbym/w-w/-b3z a9*0tf0wa 4 s gnruth half of its original speed. What is the ratio of the final kinetic energy to the initial kinetiz0swusj aw-tb4 * mgbf3/ n-y/r aaw90c 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 moving at a speed okhf18qq(k/2y p(p 2f eju22zqwn d7qif 5 m/s. If both objects have the same kinetic energy, wha2(8qqqi(w2uk zyph2e 7f /nqp jfk1d2t is the ratio 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 speed 2.0 m/s.er e..8xlax,hu24 zn;b,tef d62geypw o0a :m A 1.0-kg mass is moving with speed 4.0 m/s. Both objectea dxa0pn z.4hluyw 2f x8r:eet,mg2 6,.b;o es encounter the same constant braking force, and are brought to rest. 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 a mo0f 9 1tzuuym5hnjc,n- t/-7 o.cruvstraight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under.-rj/1u zn7c5m ut9yvft o,-m uc0noh the same conditions?

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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 mvxmql.*4 tv :). enlsorbit. Neglecting any friction effects, what havemx.n 4ql:s*mt l v.)ppens 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 priscls) zh,6r8 znciple.
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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 a42s)z de5p:jzcgveq6tr2gc 9laj; n + system to have negative 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 restppa qo:. 2/ou7bmc;x l a height h above the ground. A second object with four times thu;l ob2. mq /7po:pxace mass of the first if released from the same height. The potential energy of the second object compared to the first 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 attached to the end of r 1x3m;ysdm5qj ;axny.haov900:hbo a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of tajhbo; a;m50q.1r0yvd9mxs x3on y:hhe spring will be

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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 u nx:o*:ie0qo 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 kinetic energy K, to its pod8729ct ud umptential energy U.cud p9dum728t

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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 hr6f uk/ jn8 rq:l2ihlp.3bya:7; lzocar driving up a hill.

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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 a very heavy object are sliding with equal speeds along g-y by5y.95sbvh0* aq l0ofog a level friba .ogsov09 q-yhgylf b05y*5ctionless surface. They both slide up the same frictionless hill. Which rises 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 ox 6*ko 9fo*dr$m_{1}$ 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 mechanical eeb jwj9 n.xb7vdie9f/ f(29- nj.y6epgn(z bvnergy for conservative forcesbnxg9-b jn6(e2z7v fnepd (fjei.j. v9 b9yw/.
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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 buid3v)qiz/l)8jx - vcq klding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potentialiqjl)cx -kq zdvv/8)3 energy (U) at the top of the 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 a u8xpp. +iwox9pp(vx7nd gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the p8pxpx7 . 9xuop +i(vwball 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 of gravitational potential energy. rf5l/oyz7;b cz*u pmec 6nn)/ yt5u /bDo not ignore air resist l*y6nup//7 ;r/ofucmz 5)ebybct 5nzance. How much kinetic energy 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 of ru05nq8jr 0arggvx ueg6*u7. 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 isuuy4g-ck:zdbx*v 22 a

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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 unit of 88a f8cjg/g:qgzew7f px:+t lpower 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, which is6q2n2 .+t1;p nc;. gbw2gw lu qztvspv 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 didak+iow ze3 v86 3 times the work in one-third the time. To do so, your power output must have beeaewvo3i 6+k8 zn

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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 at a constant acceleratxtvh3aa2k5ii 9kv :1tion, 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 vertically 2.0 mqsg)6o8igq78 bubrf:e 8 g5qk and held there. If the object weighs 90 N, how much work was done iq ) igrgq5867g fo8sku8qbb:en 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 physics book up in the 7fi.idtr* gq(3mc,l oo. plj0air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by thep.t(rolj d,mlo 7.i*3 0qcg fi 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 +w3yjh v*0 4tef,fmb44hgbdf upward with a constant force of 5500 N for a distance of 50.0 m. What is the wwt f+ 40hmy3jb4,hfbve*d4 fgork done by 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 pulled upward with a constant force ofeoquw9 q82 d6e 5500 N for a distance of 50.0 we e 8d2qqou69m. What is the work done by the weight of 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 pulllahjhan54 ;q3 lre33argaj4 k s8s+u+ed upward with a constant force of 5500 N for a distance of 50.0 m. What iss arr aqk;a+h3j4j+ 43g 38hu alnlse5 the net work done on 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 up along ah fc ,ur:cg()y $37^{\circ}$ 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 m down a ramxc; q6r*f3x2 shw(v lhp, 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 Sara6gvp wo/ 1/hzhbao6 kjckll61)m/x qrh9m*1 ph in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle okxvg/1 k /hapm*l)rh hooq/mp b6cw1zl 66j91f $37^{\circ}$ 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 fo /rx c6vcw;)garce. The graph in Fig. 6-1 shows the forcg )wx/crc 6av;e versus the object's position. Find the work done when the object 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 ikn *efj +57rc 7o;2qcvld.pacn the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fin2.*c5enr c+ 7k aldjo;q7 pfvcd 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 of the fory-0 tvh,o/ynsce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 tooy-0y/,th sn v 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 objecgz-(r5oi9m8hbg-m l i t in the direction of the force. The graph in Fig. 6-1 shows the force versus theozim5h(gm-gl -8b i 9r 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 cart (hgad ib p2la- (9odz.4initially at rest) across a 10 m level surface. What is the fin a4dpal h2.zd9o-(igbal 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 at reyb:pxrfpn9xm q 4:5-a srz8k: st) acrosmx9 :aq4-zpbrr::nf yxk8sp 5s a 10 m level surface. What is the final speed 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 9oudhzx5d szq):v.c .with a speed of 5.0 m/s. How much work is required to sto)9h dxc.sz:do.qvz 5up the mass?

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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 initially moving at 26drl1*n sf,z m+3afamz d1xwz.6j r; j5 m/s, what distance is required to stop a car moving at 50 m/s underj6 lzrm+nsfa wz r;dax6d .1f1,j *zm3 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 dar.5izp4r6i booiqg.i6 t. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has boq.p6ri6i5go z i4. inegligible 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 co7 oy(tx-x*yrbu a21aiu*c3 j mmponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What cxyiabm-xjua1uy7( *or t 2*3 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 ho -5mjs1u tn.2kj:auihrizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It peneu12i mua-nj .h5 :ktsjtrates a depth of 20 cm before stopping. What is the average stopping force 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 height o;ls1hb vn3ow 9k-bk;2w9mus af 1v2s9 sabnwwmkl1 -uh;;b9o k33.0 m above the floor. What is the change in gravitational potential energy?

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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 plane xq2a4 6kxq5sk zr :4qxis 4.0 m long and rises 2.0 m. If the plane is frictionless, how much woxs 64z5r :qqx 2qx4kakrk 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 stretch 2.0 cm. r3w6w7 ktfaj*What is the spring conk * 6f3wja7rwtstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characteri 7f tn0fm-3nsr atp6e;zed by a spring constant of 60 N/m. How much potential energy does it store, when e076mf;- pnnftrs3 at stretched 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 compresw a 3yurpx* x,/o96ppes an initially uncompressed spring with a spring constant of 25 N/3r upa*yo/ 6e pxwxp9,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 stretch a spring of springim10r pv-y x7a constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position r7-xp0im ya1vis at x = 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 compresse(xhb 8sv gzo4/ twqj*2d by 3.0 cm. How much work is required to comprzobg2h /(s4txqv* j 8wess 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 rest fromgof59g0bfsj8 u1)n jb the top of a 50-m high slope. What is the speed of the slier on reaching the bn 9fg jgus 0b5j8)fbo1ottom of the slope? (Neglect 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, pushes off the top of a hill with an initial speef3,o )ym z kx)f kw:3sj(qki:kd of 4.0 m/s. Neglecting friction, how fast will she be moving after droppingy:k)) ikjkmz,3fw s3:o(x fqk 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 frictionless irw ry;ec/8(z ynclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?rr8(y /ezwc y;

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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 floor, its p0uhn cc dguep4t/4qw kf nv78j:;y.4 aotentia4uth4uj : qwnpa0c g 8e7vfn.4/;cdkyl energy exactly equals its kinetic 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 levek :fjups uf1 9tz;*e*al with a kinetic energy of 40 J. At the exact top of its trajectory, its totta; 91jfeup f:usk**zal mechanical energy 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 s qe) 0wmrpc9+mz/1fcenergy of 220 J. At the highest point in its trajectory, its kines/z +c0fp c)wq91mem rtic energy is 120 J. To what vertical height, relative to its launch point, did it 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 from rest at 48f2 acbvv d19dc; zw ca;rn.qa point 45 m above the bottom of a dip (See Fig. 6-2). Neglect fri fzcdv9nw18.rbdcq;c ;va2a 4ction, what 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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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 p a3ssxqxq9cf5 , .an-ooint 45 m above the bottom of a dip (See Fig. 6-2). Ns,c3 x-qaxqf. 5as9no eglect friction, what 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 g4h 8xc;nrwa 8a0q 2nsgb+0 h+h qf- hjk13rpia point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, waq02hr4-hj0 hg fnch+1 r x i38;wbnpak8gs+qhat will be the speed of the roller 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 tlq ).bb9k rryuck )/v1he bottom of its swing (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 c /.nbwbriz (ek77f t)ym is pulled 30 cm away from the vertical axis and released from rest. Wha b7zn(y i/e.k7tfbr)wt will be its 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 c; (/wnt4ix: -bxjq k/kt;1w vj2qtxg25 m/s hits an initially uncompressed horizontal spring with spring constaj wt/ (xqk /-wxg:itncvjt ;4b 1;xqk2nt 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 to stop for a red lignl0.: 4keky hdht. What work is done by thn 4e0 ky.hkdl:e friction force against 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 between a 60.0-kg object and a horizontal surface jk72co4qmev - is 50.0 N. If the initial speed of the object is 25.0 m/sqek7m 4 vc2jo-, 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 rough, level surface. It ih6zwx4 gn5 ;j3/igba9- xcy3q zr4hbhas 24 J of kinetic energy. The friction forcebr;9c43 5y/wxq4inhx 3jhgi- gaz b6z on it is a constant 0.50 N. 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 x,tzfn1h 4l 3umass on a level surface. The coefficien,43fthnl zu 1xt 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 energy?

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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 starts from rest from the top of a 50-m high slope. If the workp ; dxm:0ord1da2f ym4 done by frdd2 m 4 1omdyx0r;ap:fiction 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 insvc7/pu(w v)nclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3(pc7n )w /svuv200 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 a plane inclined at 20x f+ :o fg1ywn4ho+lws ncm;;m+k u12ke above horizontal. The coefficient of cfn+u s2w:xn++14kgmlkmo1yo ;w;fh kinetic friction between the mass and the plane is 0.20. What will 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 dud kx)un.0sp1.5vz wq jd.2v10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts o1wdkzx0jns.2v d)p qd.5.uu vn 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 d81 tv8/3idk3hyc rfyge2 s y+energy when he runs up a flight of stairs 10.0-m 218/ dsyifv3yy 8khrtcg3d+ ehigh, 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 ob,jzw,;(voewk-5sp mixt l*y2 o.2wq iject with a constant velocity of 5.0 m/s. What power must be delivered to the object by thetj mw,v 2,y w2(sqi*.x;zpow 5kloi-e force?

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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 are used by a 1.0 hp motor that .i ve x vnsja,y)1g7t,runs for 1.0 hr? (1 hp = ,aisvjxg yet1 vn,) .7746 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 riding. How much forpl vx8m6.w b5fce does her foot push with when swv. pb85fm6xlhe is traveling at 8.0 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. What is 0d* pxc k4gx ixcv2f4 jp8hn(gy97c +mthe average power delivered by tx df7hjpg+ *9nx0 cx244cikpvc8myg ( he engine? (1 hp = 746 W)

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