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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test60.html  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。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  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 unibpt);gooy d1 :t of work 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 there is no motiot 0hgciwo1q+b4jd rq w0d8 8.ln?

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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 bric+w h09ck mi(mc8-plerk wall, the amount of work yo+(mpli8 wh- cemcr90 ku 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 9yw 39nrd z;sxr7.h3bq:qygk vertically and is being held there. How much work is beiwrq9 q;yn93b yhkzgr3 d 7x.:sng done 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 atfe9 -rum50/w af -wya constant velocity carrying a 10-N object, th9-rft /eyaw-5 fua0wme 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 mz hwg- 9set 460vxkn3b then returned to its original position. Ig e0k9xs64 wbhntv-z3f 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 ob6- br8v8o4ad fm-vfk)afpu*o e0b c,iject 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 sigr0 3w6 xnk9z.,n jmi0owqa lu3n of the work done by gravity while the bamwn9i00xznwr u3.ka6 3 ol ,qjll goes up with the sign of the work done by 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 position (F vs. x) graph, represents0 flxqg:6xo(qkmh*yfrl f) 7(:xgfxkq 6oll) *r qfh(m7y0f(

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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 vera *do(o g4f-zjsus position (F vs. x), what represents the work done by thef a*ood g4(-zj force 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 oin+7(zfr-f2d l0sb xa bject'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 pi + ;yc sh6l9)xtk3gkan 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 object's kiniolah . yk*3vs8efvl k;g ))jdc0sq:,etic 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, and is moving at twice the speed ofju v(;tje; r4pp5zi,ul *h*bf p:gk 7b the ca4zklh;5pj;v *urpg*b ef p(it,u7b:jr. Which statement is true about the 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 the mass of car K06 yasx 9(p*u1i ukvpd. The kinetic energy of car J, compared to car K0 iu apv9p16k(s xyd*u 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 bouncef bbcff.s1m; +xixfx2g ;m(6is back with half of its original speed. What is the ratio of the final kinetic energy to the i(;f1b6xg sbff; m+c xm2.ifix nitial 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 moving at adksoo e,cdizs/(- n 1* speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's ma cz n*o1dei, dsk/os(-ss 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 me)l.)ibb .+mk8 psi ug;ri/ht oving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are bm klhu)sr e)bgii. +/ t8;.ibprought 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 arvs)i sfyl-16:j( n4dgxw (rof8b iz - certain distance on a straight, level road. If you had been traveling twice as fay o4i:rnz1x8s- bfd( isg )6wvf(lr -jst, what distance 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 ;nll c0nd p5/vji/rt; elliptical orbit. Neglecting any friction effects, what happens to the planet'sntl;j; //n5drv 0lipc 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 princ2s 9inpt6 )uzws7jp:m iple.
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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 sy-l, 7i ovvsx(tstem 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 rest a height h above the ground. A second s-8 0c ,rla 3mjh6crbbobject with four times the mass of the first if released from the same height. The potential energylc, 6mb-8hsj3bcr 0ar 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 jc7ot59(4jvdj 3nn r w ;kqh2send of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potenti5 273nodkh(j jjrqcs4;n 9twv al 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 energt4;yf3peb v6 ky 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 a tree. Compare itfy 3*h jsqsk*;ngwo* +s kinetic energy K, to its potential energy U.yw *nq*ohf3; gks j*s+

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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 hotzuq1e : u 5zyml3v3(ill.

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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 obpp +*(fewnlir*0: g rmject are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises ip0:g m r**fw+nepr(lto 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 zgni:hk e,g u m9d-6*b$m_{1}$ 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 conserv3tuvzblet. an9185 jfative forces.u9 a3jfzbtv 15t.eln8
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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 b p(zo:x: p4tqthe air (air friction is present), to the ground below. How does the kinetpo(:q: pb4 tzxic 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 gair3jjzx ,oq e(/d,er -dns 30 J of kinetic energy. Do not ignore air resistance. How much gravitational re-zx,j/je(o q3rd ,dpotential energy did the 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 of gravitational potential ener+ a a gc(ugm9)hf0plq5gy. Do not ignore air resistance. How much kinetfa(+5p0g)hmcg aq9 ulic energy did the ball gain?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 conservfk/wsbk7b; x814a on r9 (xkscation of 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 is 3puumz6b6qify/q0w7

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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 p1py6y5av k (fz:ytzmxd -7)q jower 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 is not a une 65co+,s vqneit 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 3 times thf jfa5v7hhx7/ft) m+ce work in one-third the time. To do so, your power output must h 7 fhf/t5acjmx7hf +)vave 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 constant acceleration, the car'svbnq014)qx(lm p (w vf dn7-s:nkm;qb engine must

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 hel5lsaz 9w ,(himd there. If the object weighs 90 N, how much woh(9mz s iaw5l,rk 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 physics book up in the air a distance of 1.0 m, at a conilulb7 (kf)5 i.mdem nf3h( (tstant velocity of 0.50 m/s. What is the m)f53un ld(7 b(( mt. ehlikfiwork 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 pu;t h-;-nmdxhw yoj:/ mlled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the hdn/j- m:o- ym whxt;;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 constant9fhq i.k(pz()ds fgdxp4;t s/ force of 5500 N for a distance of 50.0 m. What is the work done b pdd9t zgf(ssq;4) ifk/xp.h(y 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 isiszhtma)*r ..j3u)y9t(a vt z2ssi o/ pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net /(as .*ui.3hztts imj9roazs 2)yt) v work done on the elevator?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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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 a,u bso(e o5zpdd7w47v pm o/5along 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 m down a ramp, inclined adaxerca(rlsw.(i*01f b61 gq .h j)tmt $30^{\circ}$ 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 o.ze o mei0;zny7y29 cfn an icy surface (assume no friction9miye72efz y .0 conz;), 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 graph in Fig. 6-10sf.*6hzs9bm(tirr)roh c 92 w 9bjto shows the force versus the object's position. Find the work done when the obj hzw.ibsr( )r rhtjo 69*t bm92o09fscect 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. 6-1ifa 9 w0d o/ob1mf/vp2 shows the force versus the object's position. Find the 9f/o oaifv1 0 2dbpw/mwork 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 force. The graph in /xq 0v 1mdorw;Fig. 6-1 shows the force versus the object's d mvw;0 1oqr/xposition. Find the work done when the 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 eflz 1ka+yqzo/mp *e585:vfbFig. 6-1 shows the force versus the object's position. Find the work done when the object move5ve5ak1qf/b*8 mypl:o f+zz es 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-yrgqi *g 67*wc tt7wj-03wtqykg cart (initially at rest) across a 10 m level surface. What is the ficr -tw7*q ty7gt0jw w6igy *q3nal 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 mp hm 9q:4d( tpb6bmo*ud ;jg*to move a 55-kg cart (initially at rest) across a 10mm;*bj9 p:b *4tg6umd(pqhod 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 with a speed of 5.0 m/s. How much work is rinhmuxbfa a out1 0,374;g ;lqequired to stop the maslmxn oa , 41u3qfgta70;uhib;s?

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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 25 m/s, wha43zlkmdf )u1w t distance is required to stop a car moving at 50 m/s under the samldwu kz )13m4fe 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-gb*yw rd1+v7zad) x n9m dart. It is cocked by exerting a force of 20 N over a dis arvdb9*7n1zm y dw+)xtance of 5.0 cm. With what speed 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 x /v /j(n,9pxuipze wd75ywfr :ub/a(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 horizont5/i ,d7xfwuvj b /u(e x:ypap zr(n/w9ally 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 shona 4 nf9m9mf7bt horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. an ff4m mb997n 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 7ygio ,n,g3ut(,eu httv8ju6 to a height of 13.0 m above the floor. t,e ,g nyiogt7j,3t8u6 hu uv(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 placyda o1g)nxqarbxr ,f:u- -92ne is 4.0 m long and rises 2.0 m. If the plane is c2oda r-q9g:y ) n-,1fxrb uaxfrictionless, 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 o07 lilt 9r- )vqsc,whntmp94 fnto a spring, causes the spring to stretch 2.0 cm. What is the spring 9 , m7sl4) f- t09htlrwcqvipnconstant?

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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 coxxyio: wwv ,*u z;7iyev :(9lmnstant of 60 N/m. How much potential energy does it store, when stretched by 1.0 vxii *79yuxl;o zwem, v:w :y(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 compress an initially:3gwf;n r;rb lcp*kv(7s( sex uncompressed spring with a spring constant of 2r* k:3 7lscbn(;(wg;svrpefx 5 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 stret0q2ajjt ifq zmb 5br q64/.ul.ch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at xj5q/rzqt0 j2 bqu af4.l6m.ib = 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 cm. 2xxygw oo4;+ .lrk0dt How much work is required to compress wox y2k+g4;0d trl xo.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 from the -p,3o: ukte*vfpp.s;f5sfm s top of a 50-m high slope. What is the speed of the s3skf*t p pfm: s.e-,vpuo5;sflier on reaching the bottom 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 m 9 n76ocspch76ssfv( ebs2r0an initial speed of 4.0 m/s. Neglef(rvso hb7 e c79scs0sp2n6m6cting 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 iat,m) u,ks do t w+7k1kq7sn9frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height nw,7m k9s sot)kt+ dqua,k7i1 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 nac-7j au rme;(:.qpu above the floor, its potential :mcu;7aq.j pn a-u(e renergy 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 1r ,sg(3 ij9sz(cjs.m i0 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its totalijs9 (j.gisr ( 3msz,c 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 ener:t6woyin /ka :gy of 220 J. At the highest point in its trajectory, its kinetic energy is /o ya6ki:t:nw120 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 a point 45 m above the 7 :or9,7qw,)ctrc.z xgxh pxo bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller co7,t hoxw.z)7xgq9r ox:r p,cc aster 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 mth2 di :sfd)-j/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, whatjdti2h-) df:s 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 bott )ax(mn5by)kuo5 nnl9om of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope,b o5 ky)nu(n95 mnlxa) 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 s--j jv qc*sxl.wing (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 t3z 9qmvxb)q zj2bi)b1 he vertical axis and released from rest. What will be iiqj9xqb ))zz b2mv 3b1ts 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 hw6qu bnza4-: qorizontal spring u qnqa4w:-bz6with spring 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 for a re*itc r ifub*s4)y/bd:d light. What work is done by the friction force againstbt4si ud: *yrci/* fb) 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 obje9a rhn5gcc4s 5ct and a horizontal surface is 50.0 N. If the initial speed of a5c rsg 4nc5h9the 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, leve. 3rm5dxq( egrh*vf v+l surface. It has 24 J of kinetic energy. The f*+v dqv5m.fxg rer3 (hriction force 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 mass on a level surfax81yo7 79o:lx9 ni fkjesz;xf ce. 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 kineti 7oxiy8;7f9 oensk 1 9zxjlf:xc 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..y no.ch ahdpso k4)1 of a 50-m high slope. If the work done 1.pha y4do o)sh.k. cnby 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 4ln 08z(9aktae wc302eqq :bwiet-gp long and rises 2.0 m. It requires 3200 J of work to get the box to the top of e0:bze29a3 ew4q g-wcl k0tqap 8t(i nthe 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 q qofc,r2qk)+04 dj yathe top of a plane inclined at 20e above horizontal. The coeffi2)+qfy ao d0qkjc,q4 rcient of 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 10.0 m, and strikes the gro* r9h m4mep3z4cd7 ri 5bwomu,und with a velocity of 7.00 m/s. What average force of air friction acts on it as it fal7ic 4mez w4 9ohm5r,3 d*umprbls?

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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 wh 9tz;uk5 9rck 4p c,9iwm0fk6 ll7cpcsen he runs up a flight of stairs 10.0-m high, 5pc0cw7klcc lmtir9sk4f ,p9 6 uz9;kin
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.h*k6 zufnu. f50 m/s. What power must be delivered to the object by thf u6fn k5.h*uze 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 stc gho gc9-c e-75kc0rgez ( +q,vs7ithat runs for 1.0 hr? (1 hp = 746 g0e-itrcs-gc(ck svcgh 57 ,qoe7z+9 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 h7bz4l dy 2eo0riding. How much force does her foot pushhd7 2le0o ybz4 with when she 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 accelern/wf g2d.5 uqoates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 h 2dn5ufow.gq/ p = 746 W)

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