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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 una6*rtwqe :5c)f5a cfait 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 zb(x n- ej0c 7+yda*dpis 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 fzy18u-9a( yd; dgdl+xcct;aa stationary brick wall, the amount of work you z1 (ald9xcy-yg;futc+ 8dad;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 m3,jk(ha7m k pgdvg0xm,3j0 yh vertically and is being held there. How much work is being done in holdvmhh p3j,j 07,k 3kdgy gx0ma(ing the box in this position?

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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skysky1258，获取更多资料
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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 horizonla:0po8/ptv 8oq26 wgozbcn wv ch990 tally forward at a constant velocity carrying a 10-N objectv o :tg 09o9 nbazwqclp2pwv86h8c 0o/, 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 liftedt;h 023jagjkt vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much wkjgajtt023 ; hork 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 forcqxi)q90 (l pgce 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 the sign of the work done by gravy.+z0hi8l*om sjwtnds2*b . rity while the ball goes up with the sign of the work done by gravity while it goes downl*8 .jb2srz i.d*s0ym+ toh wn.

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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, o5;7xb7wlwj6n v-aspthumq/snc *v( 7n a Force versus position (F vs. x) graph, representsw* h; t7mua6v7p lx /vj5-7wqn(bscn s

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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 versb:il9o8cs-jr 8-/qao0 fr hxqus position (F vs. x), what represents the work done by t:9/olx8rcafsji80-roq h -q bhe 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, th p73h dnpe:tk77zfwo+en 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 an object is negative, then11x(kx emvcv 4m ,wq-m 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(0 i.v6 uuj tjjva+twaxf: lu-cyp.sfw9+ 5p: 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 as much as a car, and is t27had2s pm5w moving at twice the speed of the car. Which statement is true about the truck's kinetwa 7ph2 tdm52sic 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 /gk k1:fr.arv K, and car J has half the mass of car K. The kinetic energy of car J, compared to c:k/1.vk fga rrar 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 ank sn7s/ jv7 qo)znpa8. j-pnu3d bounces back with half of its original speed. What is the a nqjn3 zn p.k7o7 sjs/)-p8vuratio of the final kinetic 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 moving at a speed of qav30b; yv: xp5 m/s.v: qx3y;vba0p If both 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 masse5 jn*km imur0c73jr5z;yyd) +0ewtf is moving with speed 4.0 m/s. Both objects encounter the same constant braking forcdm7) u*mrzt+ eeik3f5c0 y 5wrjynj; 0e, 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 brake /ric5va3m8r us of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance 5 r/m8a3 virucwould 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 elliptical orbit. Neglecting anyedd ,,oas1v5 hjzu, *ert3 4np friction effects, what happens to the planet'se4*v,an,u, 3pszo 1rje dthd5 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 princi8z: 8rv; obinq*1t, h huiof)sple.
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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 negative potentias98pshqw6)glsh6fk3 b sq,1 h l 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 groq8-)tx gsn,xnvg -5 r4gp*larund. A second 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 firg q pgrr)g4-*-xv85latn ,xs nst 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 a spring causes+adq sr4f c1g) it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentid )+fg arc4s1qal 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 energy of e1i rfmw)95ni:qkd9y3b 2i q ua 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 potlq1 nx0sq* 2j1ce 6jpz:wzt c/ential energy Ulpjqtes 6 1:n1 j/2c0wxq zc*z.

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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 drivin qgnt+fhaj0q7z1+i8e g 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 objectiq:s q4 2qiuj/ and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up tq:/ ijq sq2i4uhe 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 3jek pez-eae.2 )i1ci $m_{1}$ 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 wwt 2 30,r x9inypklnuz7; ks;conservative forces. 3ui 0lxk,kz2ypwn wrsn 7;9t;
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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 frictio f:nxtgu+5y2z6odmk1 x 19zgjn is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare 15u x6tg9xj2 n1 fymzok+dzg: 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 energy.9ne r9-yyi7ne Do not ignore air resistance. How much gravitational potentiai7n-9e ynry9 el 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 distancd:ij9q64d ca fe and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kine c6ifajd:9q4d tic 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 eneryg 5k8l2 xsf5sgy.
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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 iss u)y8ag/ ls+ zbgz/0o

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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 poc9 a;01q3;nohcpb5 cgl 5;ien ju+h .lcbn sf1wer 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 uni8 ( zf- vy:+ratt6tcvvt 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 the work iumn of6.8tpf 5n one-third the time. To do so, your power output mus8mfot p5f.6unt 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 at a constant acceleration, thelyms4j-h v65a 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 f/2le 5 +0 z9ysina:al3jk awc kfu;0dand held there. If the object weighs 90 N, how much work was done in lif kuw zsfllc329;ka afj +ya5ide/00n:ting 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 physikdr) 5l5 l):8fleltxwcs book up in the air a distance of 1.0 m, at a constant velocity of 0.5l: l)x kl5wl58fe)tr d0 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 fodzg5d ey so;*a 3sf(9e mn+t.rrce of 5500 N for a distance of 50.0 m. What is tf*(;z ymgo+5 dsnrt3sae9.dehe work 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 uf) r/cmdq fl223i4sqrpward with a constant force of 5500 N for a distance of 50.0 m. What is the work done )f3q i/r qmdfsc4 l22rby 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 dqj 0q9g2bv4lleztm 8/istance of 50.0 m. What is the net work done on the elet v l0l/ bq48e2zgqmj9vator?

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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 mw* /n*yhh)4lo k;cf7hldhs, up 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 m down a ramp, inclin(7 w+juyyr -gnna p (0io/n+sved 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 an icy surface (assume n jihi 3/x)*ensvb, ut9o friction),ji)/vi t*n uebx,sh39 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 objecq/m bgitu(ur)5y: q89z l3ksht in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the worz 83)hsb9:uqgtiu y5k m rl(q/k done when the object moves from 0 to 2.0 m.


本题所包含的其它图片:

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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. Theeg.+z4qiv46.nj;ud7sbi by/qe d ev/ graph in Fig. 6-1 shows t4ie7dn be+ /eqgju.vbd/zi;s v6.y4q he force versus the object's position. 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 of the force. Tbea*;u fhee),he graph in Fig. 6-1 shows the force versus the o aee; hu*)eb,fbject's position. 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 cr ll6bg k4y23direction of the force. The graph in Fig. 6-1 shows the force versus the object's position.g2cy blrk6l4 3 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 2 0*i3bf9mo*; xalre uv00 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is t0ul**erbfxa; m9 3voihe 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 applied to move a 55-kg cart (initi : 7ueomvsz;x-xt7ic 6ally at rest) across a 1-;xxo6m: ut7z v7cies0 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 relfbf ;2n8tc5 g f; ntu,qfr*nogi9 - nyj:4i9xquired to stop tny r4fn9i cf;5nftu*giq9 tlfox- 8gn: ,;b2 jhe 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 initiak0* g,:olo qqlb;ce ;ally moving at 25 m/s, what distance is required to st,:ql*0lc ;akeobqo;gop 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 propels a 102ah; a -,feny6,t x1rqhh6aly ml/e (n-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave txehe- /aqt,hh (lnf 66am a12y;,nlr yhe 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 verao i,w nkbj9- )gne7w5f(;8nt lv q(sstical 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 ,bnq(nag v9lit)7-ko e fw5j;8(nssw 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, strik h;ekt 0za:b*bing the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopph0bk;a*bzt: eing. 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 z4iy(jmd9* nlxvjre+ q1d :c+above a floor to a height of 13.0 m :( j1mzc9 +djdexyv +4liqr *nabove 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 in n:laj*3m, p s-ycyh+iclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the push?jmyp- yn+iah*,3:l s c

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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 stretcq.n *cxp cf1y ;;l xqlpeu1+*xh 2.0 cm. What is the sp.xu*1cll qy qpxpn;e*+;cf x1ring 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 60cf /0lpbb 03to N/m. How much potential energy does it store, when f3cto b00lb/p 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 compress an initially uncompressed spring with ae qgao5e3q 1vwvnu u:nbz8926 spring cozeu g3b9 a6ew1q nvq52ov:nu8 nstant 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 stretch a 5 /u4mqbsgjk6e4d2+a k o8syq spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = mj8 sqog4+u/6y ska bq2k45d e0.)

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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 cxeut.hxehk/ ye 7: /k5ompressed by 3.0 cm. How much worex5 tx/uhek h /y.:ke7k is 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 fro5 ucip),dypggt4-3g im rest from the top of a 50-m high slope. What is the speed of the slpt 3-4up5 , gicyigdg)ier 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, pusqwjs1 )u*l1 e1gbx.hohes off the top of a hill with an initial speed of 4.0 m/s. Neglecting frict1.ogxq 11wh j ul)*bseion, 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 downbe b.* tswxbo(p:6tw 4 a frictionless inclined plane. At the bottom, it has a speed oe (4:b. t*wpbws6b oxtf 9.80 m/s. What is the vertical 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 bdw/n l))(rz1 zotl6hto the floor. When it is 0.70 m above the floor, its potential energy ex )n16doh zzl /b)wlr(tactly 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, bla1 lmhd8 gi3qsd:fn 8(bsts straight up from ground level with a kinetic energy of 40 J. At the exact top of if8 b lq1ni8(shgd :3mdts trajectory, its total 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 energy of ,:w5vp-/rgglsmr h m. 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative tgv-rsh p rwm l/,5:g.mo 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 eh(cymkz. o.swa6vum (4pv)pj(.2xk 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at thekz.x.pm(p )mcs4 .h6we2(v(y j oauvk 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 point 45 m above tvt nv,jcbj*0- he 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 abtn*-j0vv c, bjove 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 j8bjim;f9pd59 civ +vr 9sat 3dip 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, which is 45 m abovebjj; ar mc59t8vpfs + 93iv9id the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at th g;ayv 8xz3z1se 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 cm is p9i; . 3jmdk1kcs 2vy,no2l;f n6ajl4nx(w gmfulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom ofs k(1;nfdm.nk anw y, 3jl2vmocx249; 6lifjg 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 ho+ d -c 4a2 f) oohg3xfwndj5f,epmw62zrizontal spring with spring constan5f2jwoa- f 4oxw 2 ndc3ez g+pd),fmh6t 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 tam:wkpw 9 svz9 8tj6e3yc6(qsx0pg, to stop for a red light. What work is done bqj:sps39xyvt,( 8 eazw m0wpkt9g 66cy the 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 f0jd s16 ( 1to ilqvgv50-;cgbvt(noigorce between a 60.0-kg object and a horizontal surface is 50.0 N. Ifit tl ; o6n00o (vvdggsbcqvg( 5-j1i1 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 surface. It has 24 J of kinetic ene-duuu azy w3+5rgy. The friuuzw y5a-du3 +ction 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 horizontaq:u 6*m7iokyhjw ,;czlly to a 2.0-kg mass on a level surface. The coefficient o*6hmuo7zk,yc:j q; w if 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 higloyt20-3k eg ugwjb85 h slope. If the work done by fricj l25-e803kt yg owgbution 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 inf+ m:-jxgu4 *6omvpu fclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the av xffuugjp-* m4:m+ 6voerage 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 inclinez(z3+7vlq;o )0+sh b2 aezdsq nz kh4ud at 20e above horizont; qzq sdob7nlsv 0)uzza khz3(24eh++al. The coefficient 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 grox1v: i9bij xqrs )31xvsgeg8.und with a velocity of 7.00 m/s. What average force of air friction a 1g)rsvxge:v x1bi9jx.i3s8qcts 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 up a flighi c9 r0*hi7mwk)apgq.t of stairs 10.0-m hig hi0) 7.qm*9ickp agwrh, 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 5y tdhdn42.fcc y95t m2.0 m/s. What power must be delivered to the objectm4ht yyc9dd2cf 5 t.2n by the 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 eqgewt e(,(y. (tba .npnergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wt( byw,et(a pn. e.gq()

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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. How9.:ysw4i tl 9oof4 bav much force does her foot pus99o4ivfay.ltob s4: wh 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 accelerates from 0 to 25 m/s in 7.0 s. What is qr/ p7xbsrq2b;b6fo) the average power delivered by the engq /xsrf;6 bbobp7)2qrine? (1 hp = 746 W)

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