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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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://autoconfig.5edu.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: admin  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 unit of work ex iuf+b yr;;w7hpressed 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 zm z(h:4z dst-p :y6ozthere 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 bri9t xtr e(hspdo-kd r2qt u58bb0):*vpck wall, the amount of work you2r0 (bturt ov95q:h8 e-t*pd)dkpxbs 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 g v2)rfwpp bs 3)ikb8-7pbh-ubeing held there. How much work is being done in holding the box wv2is 7pgp))rb- 3h-bkb8fup 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 horizon1b ye 6m2;v3eg tvah-ztally forward at a constant velocity carrying a 10-N objemtz3ee2y vg 61;- bhavct, 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 then returned to its original po( y4l tlujsiw+td h)/m *u6an(sition. If the tota(4 l*dt(hua)6j mntwyis/+ull 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 +k(6 zm zk hqu*rlro43the 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 gravity whixtnsm45yt ,6s le the ball goes um64 xsy ,ttns5p 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 positionrg;-poeyky 8 6d.jtg7 (F vs. x) graph, represents87teyjpg .6-d o ;kryg

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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 positiq.jj l/ r yho- +ijhl4iq; +zgagk,4x(7jik- won (F vs. x), what represents the work done by the forco4(w /++ q-klxjr7h; hiy,ljqzk-gg4 j i.aije 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 obw*6,ghe2v:2ffsoy 2nlu t6bdject'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 8m2-n vcf zlo)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, theiuq6*lqc;2 wkg 9fj7 )asc )aen the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice al l40wqaq-(n o0ph90gf v2nz qs much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy pw qgqhn40n z9(lla0qvfo02-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 h;y/),vvmo zpgrnq1 e7olz 0d:7v bma .as half the mass of car K. The kinetic energy of car J, comparz0mav1g.7l,op :7o ;nrve ymz/b q )dved 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 wp9; w/u2bcect ith half of its original speed. What is the ratio of the final kinetic energy to the iniw9ct peuc 2/b;tial 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 pebbkl *m ewxfd+ 2bo5pejd s*j(9(le is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to thdl w ( pm(fs5 oe*9*jkdx2j+ebe 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 moving withem. rldq-eq 3enxh887 speed 4.0 m/s. Both objects encountl 7x. ed3rhqq8n8e-e mer 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, andi6-- y79, tefsj9t kas/feuvz skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under tauzk7-sev 9ttyif9ef, -s 6/j he 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 ell-83e p20qtlvm*lf qpc80zx) enzx2lsgg g )4riptical orbit. Neglecting any friction effecz-egf s823 lgr ml)c 4q2*0lx0e 8nqxzg)tvppts, what happens to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy prigl- p0o4as9orho0v 1k) la/cu nciple.
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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 potential ene:4kkame / hh :torf46grgy?

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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 u-bmaf/ sub1 pyua, n+pb8e.((mf ) 4tsp*opothe ground. A second object with four times the mass of thft1 .bebaspu*oan m fsu b/(+y8p)(pm,op4- ue 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 a spring car.79dwyg sjax.) 2u xvuses it to stretch 5.0 cm. If another 0.200-kg mass is added rd xx)v9.y7a w2.jugs to the spring, 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 -xf 29zf *):/prpwk lkg2 rwqvenergy 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 its kinetic energy K, to its potentiyi8/ mkl ac,/val energy/kl8y m/acvi, U.

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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 drivt*q(zd ) cukq:ing 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 sl0*5ae8ckh; k oaurh: niding with equal speeds along a level frictionless surface. They bothahkeu0: oh;r8 ac*5kn 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 zfzq:vx; w9n+7y7ly l *rs +jq$m_{1}$ 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 conse0dicds*x m-q3)) d iotrvation of mechanical energy for conservative forces.ddti i)m0dscoq) x3-*
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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 fridgj )a(w3 yn /c/j(bajction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the pote/)d jy(ajawbcjn /3(gntial 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 k d8/ywy.,zb3p:u 3 1umxrhpmjinetic energy. Do not ignore air resistance. How much gravitational potent1/8ydypj3xu um wp3rm:,b. z hial 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 potenh7y3ua9mfdz82 6qqp vtial energy. Do npm732yh zv9a8duqfq6 ot ignore air resistance. 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 enl5xvwljw 6n p/yu 1p s1(:uiw0ergy.
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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 85lc ce(qf*ndk 1dc8x

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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 un ;h6ots9( ktd7l 6 vm-:sow t8wf6otppit of power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit of power4-s zqtbci z :3fxdpez4/8z;c e os3h xz11n1v?

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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 wotet w n8m)4t12m pq8e(4ssq eurk in one-third the time. To do so, your power osqm4e4 usmpet ten8w81t) (2q utput must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constanr 0251zg-ci 7(6 op xpaeur9wa+fea7boxrn; pt 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 verticalt.u3d z ;)xqu aw r5bm-yto.*mg: wff2ly 2.0 m and held there. If the object weighs 90 N, how much )t . fmax.yq*;b-uw2 d: zwfm3trg ou5work 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 thet1: g3kmo4:x0 dbknf h jpa)a0 air a distance of 1.0 m, at a constant velocity of 0.50 mxjh:db140)p3: 0a tnm kakgfo/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 rzqkjun c3ljw s5,2m,z- lyv ; oo3u0/pulled upward with a constant force of 5500 N for a distance lwu ovjn;s2/z 3 5q-z3,c,y0muorjl k of 50.0 m. What is the 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 upward wilvn.j*d-dymeu-m 99 hth a constant force of 5500 N for a distance d*9 j9.mvhndl m-uy -eof 50.0 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 upw(706j krulk vxard with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevajkklxr07( 6u vtor?

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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 a ef-d+5 43y0ksd bx pyd$37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.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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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slwcd h:+kh-d/9 0ucnp vides 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 siste 3blok. q whya +g(o8ydeuf4yt1) yu9(r Sarah in a sled on an icy surface (assume no friction), with a force y9wykfu(u3g bo.t yl(y)h8 1eq4ao +d 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 di hzo (33i7dutrrection of the force. The graph in Fig. 6-1 shows the force versus trd3z3tu( 7o ihhe 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 in the direction of the force. The graph i06vw m 3ok g/e;rptm:pn Fig. 6-1 shows the force versus the object's position. Find the work done when the oko w0e:v p36rg tm/;pmbject 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 directiq 65hm7a duq/rjchj*i l,x3x wmv*j ej:7f 0-pon of the force. The graph in Fig. 6-1 shows the force versus thmi0xjdh*:hr6j / a qcm*q-jpe5 f7ul7,w3 vjx e object'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 directiowy rym617e +* w)ux09ahyh zacn of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to +1hyazcy0e6y m rauxh)97w *w6.0 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 1:da ;b fd)8lxks , iuvejdc:l2j g-m0cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the ca:1i,aj - x ;dl)fc slg:28vkj d0dbmuert?

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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 atcwi/tr,y 3fq)9 rijv3i;x z5z rest) acr3zvi5c;,wxfyiqr 9j/ zt )3ir oss 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 with a speed of 5.0 m/s. How much wor qodn)nyjxj)f,-(ixxa59 *9ynhv bf + k is required to stop thybh95- (n+nqv))jx,ix9fd *jny xf a oe 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 25 m/s, what 1h z,z y,mhc+sz7u2,imie 5 oidistance is required to stop a yhico 5 ,1me2z z 7zh,si+iu,mcar 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 m59kf 3wh e.;c d0apbbgun propels a 10-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 the gu5bkm d. e;aw h0f93pbcn, 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 vertical component of5vudi +mk 5;tf 60 N. The force is applied to a box which rests on a level frictionless floor. T+v u 5tid;5fmkhe 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 horizonxs s,ql:tp1c fwt9bp3 r1w/0ztally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm besw3,pz 1c0ft :9l 1stwr x/bqpfore 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 heights8a(lj rw(x ) b7ofrv/*dsz/f of 7.00 m above a floor to a height of 13.0 m abovlvsjxb) *w7dr//roa s 8 z(ff(e 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 is 4.0 dsf gmp* r:yi,b;ecmdy i)7/+m long and rises 2.0 m. I7g r;ypf*yic+ m:e/dim sd),bf the plane is frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, caus5i ed: wdawv ))ij0ef*es the spring to stretch 2.0 cm. What is the spring con va: 5ejfde*ii)0 )wdwstant?

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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 xw7v,r3+h.lym1 bnh lspring constant of 60 N/m. How much potential energy do,7 h1 wnx+vbm3hlryl.es it store, 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 to compress an5be5z7 9wg r6ezzhcgkiwl80( initially uncompressed spring with a spring c685elzhi(g5 c9z zwebkwr0 g7onstant 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 spring of spring 20 miw -.hwanba(4ctxconstant 40 N/m from x = 0.20 m tomw4ti 0.(na a xw2bc-h 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 initially compress*oel54)s.8v5 yj jcce5mv:nbovd1f yed by 3.0 cm. How much work is required to compress the sprisy:o5v 4bv.8l5 df5cee*vcj)1 nojy mng 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. What is the3fg oa 2xwg-9ba)a(uzi2 nml* speed of the skiefo3g2ga9bm x2 l)n*uzaw(i-a r 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 ds0o bn 84ezv7hill with an initial speed of 4.0 m/s. Neglecting frictio 0zv e7nsd48bon, 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 frictionless inclined plane. At the bottom, it hau89ia, v rl(+xs7d7kcqs,fnos a speed of 9.80 m/s. What is the vertdi(x vs,kl n fr7,qsa79oc8u+ ical 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 flsuou)+c(,l jt8 tlw.goor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is(u tl).ugjc ol s8w,+t it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level with a kinechs eu6;h7f e ;i2l1v eb85mgttic energy of 40 J. At the exact top of its trajectory, its total bm1ts h8e;c76 g h2 ;elivu5femechanical 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 wi8n -wpst sglamy6bt 30fki)/5 th a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic bg 0 kapl-3 t)/ m5tyfiw86snsenergy 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 a point 45 m above1r2l ,cn +dpjq 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 thep,qcl 1j n2d+r 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 3x) beb/ 4c 1g7pugdvj5.0 m/s 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 ob1c/p 4guv)ejdb x73 gf 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 2q ep xn6efoi,-)-fzgpoint 30 m above the bottom 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 to, ezqe 6inxo-f2)g-fpp 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 bo *z1g2 f7hzl(wm(-hr bngu cq3ttom 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 2-kg pendulum of length 50 cm is pulled 0.18 kxcpp.tunv5j 7,/wyxy b8 )6sm away from the vertical axis and released frypk ,ybxu c)nx8v6p5. wj7st/om rest. What 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 25 rim/g ).gep/ d4jq xt2m/s hits an initially uncompressed horizontal spring with sprgqxgj/m .ed2 4i)/rpting 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 fghty4/cf s4, stop for a red light. f ch/sg4,4yt fWhat work is done by 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 force between a 66d*ex (ks0kik0.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, wd 0 (ek*s6ixkkhat 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 hasg e dy8wzy; hgg4o4nf5b10*fn 24 J of kinetic energy. The friction force on it is a cogh 0;y8gfz nf4g*onew5b y4 d1nstant 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 tdl:jx7 jk +ugwh -)yh1k,0vwh o a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, wwvuj0xd k7lgyj h)+kh1 h,:w-hat 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-m2dt+ 04rew ;jtr(zlp a* n3dho high slope. If the work done by frictiont0;3r* jzod4w th2+epan( d rl is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and rises 9qv2fz* 6k-u ( mh, :+6j vd-c*tnngxvz xiaes2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of tx9(-vfcutv e6a2m ig-j:dszk+ v**hnz6 xqn, he 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 aeokr 3amh3 1 ky6.fnrv7j,lw5 t the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What nm3rfeh6,r3 5ylwoj7a v.k1 kwill 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 droppe;8ptt8. /m1eity 32h,ls ssjp v li,hwd from a height of 10.0 m, and strikes the ground with a velocity of 7.8 swis; h mtsly1,p,lhjt/ 83.eipvt200 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 bx9y* e:*bs.on2gc noh40m rxzoy using energy when he runs up a flight of stairs 10.0-m high,2b he rz.04msoyxgcxn: 9*no* 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 m /nicp1kna 8nwc,1fon0e y7; vove an object with a constant velocity of 5.0 m/s. Wha7v01y ek8w pia1,o nnn ;cn/cft power must be delivered to the object 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 en97 z-1ili1mri1kx mefergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wil 9ix1 1m1erik-mz 7f)

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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 them5,(ng 6q*kgy bw (aoc rate of 500 W while riding. How much force does her foot push with when she isg qbw,ackyg( 5 6on*m( 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 isu6ci7c r68tye 3p) mmq the average power delivered by the engine? (1 8 t6ce7q rpcmu3i6ym)hp = 746 W)

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