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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 9x0 )qud,mzdv m,k d 5,4tz 2if9ozl ru5o.czhwork expressed in SI units?

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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 the4zzp 4iqzz80/ma)d8+m myrc od/:atjre is no 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 against a stationary brickom4 .0fr,gkr0(nmi6 n yzln u* 6)sxts wall, the amount of work you,x0otf) zn .r60gsm sk(ynn46i*mlr u do

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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 vertically and is being held therehsmfr77 fnb/5. How much work is being donefsr7m h57b /nf in holding the 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 constantywzfxhxd5-p(4xt 1 9r velocity carrying a 10-N object, the amount of ww5yxx-dxt 41hr9 pz(fork 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 then returned to its origingr z)n.16qwt7virke :al position. If the tz7v. 6rgq1et:rwkn) i otal 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 obje -1brm mqlu*tqka ij- fgtnd8p8 0t,6*ct 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 the sign oynm: ud/wlu s5uwipo1c17s 7 o xq4n68f the work done by gravity while the ball goes up with the sign of the work done by gravity whiowp 7mli 8 ud167sx/usn14cwq 5on y:ule 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 adl1+ j.s 3 gwbtoe-k0s Force versus position (F vs. x) graph, represents+-0 ejdw3 1tlos.sgbk

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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 7q b8g;qbbg i.represents the work done by the force ;7bb8gbqqig .F?

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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 the u/ 8lqxp;m8mg 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 an object is negative, then the object's 5vf:.w)q menhcgut1 8 l4hs 7ror;o0gkinetic 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 objectva.ta4 skj0en) smbk ::./um;+qok/hg u-n lx'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 carue++6-spi v nu, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to t +e6iu-sn+v uphat 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 ca0*huq;6 yqezc r K. The kinetic energy of car J, cyqz* 6; qhu0ecompared 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. W-f) 6mb80)mkb1d vq ct;fsa gbhat is the ratio of the final kinetic energy to the initi)d 8-ts0mg vmcb k bba)qf16;fal 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 djh)*xz f(nl7c 4ed2 ipebble is moving at a speed of 5 m/s. If ixnjzd4c7 e()d *fhl2both objects have the same kinetic energy, what 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. A 1.0-kg mass is movingnpdfzd/w42og , kh,ig2p, yn- with speed 4.0 m/s. Both objects encounter the same constan/ y4,z,wgon kg2n-dd,hppif2 t 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 certait thy6+t*vhgum9; e m*/ya8/shxc+n un distance on a straight, level road. If you had been traveling twice as fast, what di *+ah/xht e89;c*t +mhgy mts6/yu vunstance would the car have skidded, under 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 elli-idup tz lykf9+:o*(hgg4g/a ptical orbit. Neglecting any friction effects, what haza uyg+(*4 9dltogfihp/kg: -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 pr24x-l ts*bfp rinciple.
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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 hcl.g+g o/3 trd4 9y9zy/bqvelave 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 rest a height h above th8/mw2pg)ahegr 9l k8 de ground. A second object with four times the mass of the firs m pgdwk)hlga8/e98r2t 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 attacm(p7 *ehtq7y lhed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spr7p*l7he(ymq ting, the potential energy of the 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 energyo k-- t02 ttb*ke8 lzp4zztrq6 of 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 f l88asvd e48zirg0 .vw03 ibka tree. Compare its kinetic energy K, to its potential energy U8zgvi40 3kaie lv8. wb8d 0fsr.

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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 dri; s2jkz6r-:cdpy )suj ving 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 cyghe e+mp3v l:;c9jrw,at 4 2heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater hei,c;: ehcy r l4gvpt9wae3m2 j+ght?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses q )/*2mdg2ps: erpyvq$m_{1}$ 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 energy for conservativ 3z1eml5vyrcw7a 4( 6jhv- ioze forcesw5j7al 16yzv-(v m cr4ezih3o.
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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 (airi0pgmenb (e8zl o.he00i1 i*h friction is present), to the ground below. How eehipngil .z8i*h1 o me 0b(00does the kinetic energy (K) just before striking the ground compare to the potential 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 and gains 30 J of kinetic en5c;1 w7lqfwfe 4bpli /ergy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? 7ef1wlb;cwi pqf54l/

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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 gravitation-0r (yuwouaikvff520 7 esrg0bn p0+ ual potential energy. Do not ignore air resistance. How much kinetic energy d np0r uefib ug0k 2w(0rov7a-50s ufy+id 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 enlg(wuq0m; d6 wergy.
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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 is cgku-7a:2 ;efmmva1i

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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 power expressed in SI u +gzgu,ypyy .,rc.qd1nits?

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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 is not a unit ofc. o gu81m0w: gvjuqvw/r(xghpq/g5/ 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 3 times the work in one-third the timeu7 bjp8eyd: +r. To do so, your power output must ha:7jye b+u8pd rve 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 at a consta ag: ik(ys4dsew1o ;jl,pv(0wnt 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 vertically 2.0 m and held there. If the a 0ghvvt19l6t object weighs 90 N, how much work was done in lifting iv910al vgt6th t?

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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 air a distance of 1.0 m, at a cont (je diutq(vkq5j-2zh 8np9) stant velocity of 0.50 m/s. What is the work done by thvnh edj8tu p9(qqk zjt2i -)(5e 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 co i4yd8+p, fqnbvzg42 snstant force of 5500 N for a distance of 50.0 m. What is the work dfqydi24nsz8 4 gp, v+bone 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 pull9rme02o :sugmze s2*red upward with a constant force of 5500 N for a distance of 50u*0or2 zmmr 29essg: e.0 m. 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 pulled upward with a constant force of 5500 N for a distancz: qj(ctffyg02 ;7lqkx6 y ylkp:u3fjp;y:g 7e ty xgfy:cy;kj7 pjq30:fzgp(: y f u;l726kqlof 50.0 m. What is 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 u:-qffoowfn(3 f5*/msx gtav, p 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 +t .stolsog +7 gao9 p-k*dr(yslides 8.0 m 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 a0ntrcxqg7n (e+z v/c - sled on an icy surface (assume no friction),rtzg7(n0+xcqc- ven / with a force of 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 force. The grapht.o6.-jy2 t b2 md mya4vyj4gt in Fig. 6-1 shows the force versus the object's positi.mydbjv .tt4j4o -yy ag2m6t2on. 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 in the direction of the force. Tun7ia.;12 ut7nmgidevc y+d ) he graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mogc1du)7;v2m7eatin u+ nid .yves 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 force. The graph in b4c9w)diev bqi1( n6ou*yqj 6Fig. 6-1 shows the force versus the object's position. Find the work done when they jo9(iw db4nbu cqveq 1)6*6i object moves 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+o-znixz y3 3i Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 mo -izx3+nyz3i .


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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 (initiallyjxg96v n78qc5pwd84we0xx rf at rest) across a 10 m jdg50e xfx wx96vcrq74nw 88plevel surface. What is the final 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 ape ewy* 7jpgzn7,ku(p 7 eq(px4plied to move a 55-kg cart (initially at rest) across a 10 m level sjypqgne7* , e77u 4kw(zp(e pxurface. 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 with a speed of 5.0 m/s. How much work is required to sbt.xa0pg bb-j 8f+h kf/g d*h8t8thf0 gh+bgdk/pb-. ajf*b 8xop 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 m8c tg.x67bbjmxfdvx 2 y;(d;a car initially moving at 25 m/s, what distance is required to stobcmd d b2f 8(yjgt6 .;x;7mxvxp a car moving 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 prpnbg ;l7k1c+-uganxe( 0 uze (opels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speedg(a17bugzn keen0cp+xu l -(; 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 andv)xc+w4 m*ghe a vertical component of 60 N. The force is applied to a box which rests o4 ec )whmvgx*+n 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 horizontally into a bale of hay, striking the x0 3r:.,eq,kz scucl5dbbqg* hay with a velocity of 60 m/s. It penetr5b:,sgk.qe3 x bl*zcuq r,cd0ates 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 a5*kx3u)yw0le p 1ppb pux:.kyj7 /uhs floor to a height of 13.0 m above the floor. What is the change in gravitationalukjlp ppex73y 1y)u s/0kw .p5hxbu:* 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 is 4.0 m long and xjt i:2 +but+lsodnq 9o1e.d+rises 2.0 m. If the plane is frictionless, how much work was done bxnte1t2+s9uod+ o j+ .l:dqbiy 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 str y5mn-t:nh)5xd3eood y ry3g 6etch 2.0 cm. What is the spring h3d ye xo5):y6 yno3rdmn -gt5constant?

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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 conm7n)g lzc7 5hjstant of 60 N/m. How much potential energy does it stojhcl)m75gz7n re, when 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 ;zjc6al / .dymugxnxk6* (ta-to compress an initially uncompressed spring with a spri /tal;km y6dx(nuzx-.j * g6acng 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 strehcv-;) 0sq,uyq :l mjy/v+ awptch a spring of spring constant 40 N/m from x = 0.20vw0c,p:yqy-lh/)s+a mqu;j v m to 0.25 m? (Assume the unstretched position is 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 initialr)/(j ;+dhxo aoqq9c xly compressed by 3.0 cm. How much work is required to compress tr ox hx(a9/+;jdco q)qhe 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 from the top of a 50-m high slope. W udp 2a+(gj;w0mxii1y hat is the speed of the slier on reaching the bottom of the slope? d2 u0xwi+y1gij (;m ap(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, pu+mb;be( ypu, vshes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropeb+ bm(,v p;yuping 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 frictemtyj w,6xm79 ionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertx,wjy m6te9 m7ical height of the 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 floor, its potentk, yhju/ojwie*q tg)p, 8 6rva 8-i:qjial energy exactly qi,8j- hqk)ojp8ju :ave *i6,/wgty requals 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 level wizua7kw ,ye v5,th a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. ey 7,zw au5vk,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 ye:b d yudni7oaty3cq)789) uof 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it 3 yydeuu9banoqc)7) 8:7y dit 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 a point 45 m above the bottom of hgfvug**uj. z,mq)05ock a3 ba dip (See Fig. 6-2). Neglect 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 t)kmhguo bfg*v *uc5 ,a.3 0jzqhe 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/37rjfr/l7c e ls 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, which is 30 m above the bottom of cl 7rrj/fe7l 3the 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 thep*- h/yeyd;wv*4napv qts4x1 bottom of a dip with a speed of 25 m/s (See Fny* sqp *t144hadp / ev;ywvx-ig. 6-2). Neglect friction, what 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 the bottom of its swing (p*:nv0c+ ass:dl;fth2 uoe1 qk oint

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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 fmto9;qyj4yf 271no 8ex5el * inke5ocm away from the vertical axis and released from rest. What will 8eq ifj5 te1m o4ofn 9ylk7n 25xe*;oybe 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 25 m/s hits an i /n j c6cm*)g3wfa-w gq30- xal*zznxknitially uncompressed horizontal spring with sprinf j3)cw 3xz/*xz*nwnmcgk-l0g a- a6q g constant 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 for68r :c-xj vdj6wrl3o v a red light. What work is done by the friction force against the d:6lrvvjjw-x3c8o6 r 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 objectvn-h+w19raw 5vr d 0 fh6tfjo1 and a horizontal surface is 515w+v 0hvra tf9-6on h1frjw d0.0 N. If the initial speed of the object 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 rough, level surfacer 5lw1w ozm)5b. It has 24 J of kinetic energy. The friction force on it is a constan o55wlzb1)wmrt 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 mass on a lev uodl- :6su sbcbna0+2el 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 chaldbs s n2:0cb6+a uuo-nge 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 re4; v- :ib(ffh*jr jq:f-ui m,coiusj-st from the top of a 50-m high slope. If the work done by friction isf 4mq , s(j;hv:- *-rbjifjiufi-ouc: $-6.0 \times 10^{3} \; J$, 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 silr (ojymv5f: n:s 8)c5v-vd4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. Whatvcd (ss:): 5rj5-no8fy lv miv 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 kjzzc6:c :a :etop of a plane inclined at 20e above horizontal. The coefficient of kinetic friction bet6ak cz:ecj: z:ween 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 10.0 m, and str5 w58ds3gbmpm8b g56ju nbq 7iikes the ground with a velocity of 7 s58g6w dun 578 3bpgbimbqmj5.00 m/s. What average force 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 when he runs sy2f 95vx0krpup a flight of stairs 10.0-m high,9ryf xps25 0vk 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 constant velocity of 5.0 m/*d frpcvw l78g wg,;r2vqn3g9 s. What power must be delivered to the object by the3v8,gl *7rg2fpq ncw;w9rdv g 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 areour l,r6) +vcp used by a 1.0 hp motor that runs for 1.0 hr? (1 hp =6v,)puclr+ o r 746 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. Ho. f7rkkuc m9i kmlx3 +hku7*uddrm .66w much force does her foot push with when she is traveling at 8.0 m/s? .67ruk9 lui7ukd3+.d hmmck6 m*rfxk

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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 accelerat59qm*wob,*ze 5b s0d8h hovke h +/twxes from 0 to 25 m/s in 7.0 s. What is the average power delivered /h**hweh8kqbwst0 o5z9,+5evdbm xoby the engine? (1 hp = 746 W)

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