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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://mail.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://mail.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 unit of work expre/m yqyp(h *du8ssed 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 p)6by+bl: hxx.cpx8a a system if there 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 agains*f-xjdjzou1wp4 0v0 qt a stationary brick wall, the amount of work you*j4p0xo 1qd vwufjz0- 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 av atauz7k9;g xl*0n5h tq.2lhnd is being held there. How much work is being done in holding the box in t5hat7tgav9kl .0x2; zq *unlh his 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 horizontally forward at a constant velocity nn5/z 5w 1yfm(.,w- ooipad fgcarrying a 10-N object, the amount of work 5owmo5(1nyw.fna /zf gdi,p- 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 waterp2ztmy*d( wwv8/xn; t is lifted vertically 3.0 m then returned to its original posz;yxm*wtpvd2nw (8/tition. If the total weight is 30 N, how much work was done?

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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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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 workzo g,8w12i.wd61 bxgftci ld 3 on the object?

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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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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straigh ynfhoi:;( p/dt up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity (:fd/phoi ;nywhile 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 tjs8;(gkzx/r (F vs. x) graph, representsrzsg t/ x8(;kj

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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. f.)la b,1y7 t csyhcr+x), what represents the work done by thehtr)+cycslb f.,1ay7 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 object's kinetic energ6k:o a dm*42fdfq c,xey

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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 k6) egr4uq kla;inetic 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 kinetic z.ksft9b2j k: 37vo hjenergy

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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 twices74dtjd65 f3o3 tu7hq*zlafc the speed of the car. Which statement is true abf7asj3t o53zq f7dt*dc6 hu4lout 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 carfx, b7vkd* mu- J has half the mass of car K. The kinetic energy of car J, compared to kb-x f m7*vu,dcar 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 w rtd8xvq5o uje8mksixo 7ni729/zyj9 8.z+p hith half of its original speed. What is the ratio of the final kinetic energy89 7.m 5no8qhz7yijp+vzk/sx 92r8jodix et u 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 movizzz t:/ s3lkqn:bp-0bng at a speed of 5 m/s. If both objects have the same ki :l/pt zq:-bbskz3z0n netic 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.+5x92ivb5oofqe6ie wh;nc4 u 0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same con2hxno5e 4cuof6e 9+wiq5iv;bstant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a certain disy g llyl6138rstance on a straight, level road. If you h s3l8ly g61rlyad been traveling twice as fast, 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 ellipticaqq rhok*buar)md.8*6 qv - y,pl orbit. Neglecting any friction effects, what happens )qb-v*6hukd m8q .qr*,yr po ato 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 pri, 8)h mkf9hwmanciple.
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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 vm7qafzzq )pj5 cv/x/zf;i+: h2+qvrbn h.8d energy?

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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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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 grou -db-;gbat zos)1i2tv1oi )bwv n7it4nd. A second object with four times the mass db i72toii1z)t sa4tbo- ) nb;g1v-wvof the first if released from the same height. The potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of adp 0z:m2j /a9yhrnex ) spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energyp:/ zdxhme)j9 n ar20y 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 ofh,sku bn,47 jb 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. Comprzrjz6:4eg6v are its kinetic energy K, to its potential energy 6er j6z4 zrv:gU.

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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 r6 .m,cq4 veti21zgqydriving 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;gzu7fo-ue jy +:/h5 9axvhu z sliding with equal speeds along a level frictionless surface. Thfjz g7e -9uo;+xz y:h5ahuuv /ey both slide up the same frictionless hill. Which rises to a greater height?

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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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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses sqh:c/i,n0, zo cx qz6$m_{1}$ 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 conservative forc 7wu 3ievh,3ypop ea7;:g0bif esp,i eyvo3a; :be3pg7h0wufi 7 .
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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 friction is pr1 9mo-a hr9lcpesent), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the p9or-h 1 pmacl9otential 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. Do not ignore ai7e pbt.6z;f ;tiqo6 wbe .wx42beh3yqr resistance. How much gravitational potebb7xwy;pt;63eie w4 b 2tq6. oe.fqhzntial 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 a8y f,brr-i+b:m nff9 rnd loses 30 J of gravitational potential energy. Do not ignore air resistance. How ,+nf8rbf rrb-m:y i9f 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 zf u)6cp+p nrp+qvxdyj*;/6d. veb(d 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 isglxphq2. xg5 .d+5xrf

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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 g(du t(s2vn8w unit 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, whic q/2n u n*bvu2(ogd wf,;3ih14dye acfh is not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times tzmpa.cpjl 2, 5he work in one-third the time. To do so, yc5 z.a2,ppmlj our power output 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 cbcvw 4 )hlf*s)ar at a constant 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 3)gxza; 4ccu8t14 dflit3x aothe object weighs 90 N, how much work wao8gf ;z1 iadxtu4 tcx3)4 cl3as 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 a9u-owoi-+cd qir a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of +-odo cwui-9qthe 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 force of 5500 N 2o+:p 3t1pfnt q8wgqofor a distance of 50.0 m. What is the work done by qo+3 q tfp8tw1onp:g2the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 550/ yl,w-c2d7zicuy3rd9ki 5 h v0 N for a distance of 5k/ c79 wulcz3 iyhd, y2dv-ir50.0 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 fk+y*boe td lv78l .:ivor a distance of y.l*doevv7:t+l i8kb50.0 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 6.0ajl8+ t 4 :zds,ekcp*x m 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 8.0ic:cc7gi 8/dp g5 .vkkpmgx7zj m, )c+ 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 lit ahl1 up+alc;c60af m7tle sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0fap a c61l0mhu+a7l ;c 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 the2/,yotkaxb7zl - -glb force. The graph in Fig. 6-1 shows the force vers ,o g-kl zlax2ybb7t/-us the object's position. Find the work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direc5foeo h3h. jj,7x,p n+ tn9lxftion of the force. The graph in Fig. 6-1 shows the forc .pet7x +3n,fo jfxhl,59j hone 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. rbivqx47.ukf/3* ib t2z a rmw9cr(;dThe graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves 2z.r 79k;i*r rifcwbd xv (qm/tb3a4ufrom 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*p /5 77ejalobi* gmjvnib8.w Fig. 6-1 shows the force versus the object's position. Find t .jo7n*wmie *bj7ibg /av85lphe work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (in0 ,mhi0 /nf6p6kcbvtxt d 0x n4ukqw,0itially at rest) across a 10 m level surface. What is the final kinetic enerw0u tv4/ dqtnc06 inxb x0m,h pfk0k6,gy 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 200qgw- n,x /ibmkn/ hi76 9kutqxy 7o-j) N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed ofugnxxi ,q 9h-7q/o) 76bn-ytwkm jk /i 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 movit6 w)r,vjmc;b ng with a speed of 5.0 m/s. How much work is required to stop thercwv bj m),6;t 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 wcy*f qypba/3.n,)vw0kms:s moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the sam*3bnfy.q:svyp, c /) aw mw0ske condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g d0 tsh-q;leuu26zdo 0part. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the s2-e0 udo;sh0q p6zlu tpring 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 of 60w /m +s:+13icrq bjavkq ziee3 e(hq.* N. The force is appliedivw3as./k +i:qr(1eeb 3 c+mzhqeqj* 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 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 sho uanj;9h7 -*bs2snk qyi0ca l3t 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. What is the average stopping force*7 sk2luqnyhab3j;-9asc0ni acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to vovti8ox)-6c qmoln8,h 6v b0a height of 13.0 m above the floor. What is the change in gravitational vx68m)t06hn,vol-v biq o8oc 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 lc anrdhhefi4v9 .a(c8.m+4dxong and rises 2.0 m. If the plane is frictionles4 a hea mrc.(vf9h4d8 c.dinx+s, 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 s;p vf2q0;yzbiy fce2:pring, causes the spring to stretch 2.0 cm. What is the springvf efc22i;;y: zp b0qy 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 characteriz8- +za c8hny2v,x1:ndgkves zed by a spring constant of 60 N/m. How much potential energy does it store, when stretched b:v8 8yhd ns-1xaz+k, czngev 2y 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 d0q6 )fua2tuo uncompressed spring with a spring constant of 25 N/m by 10 )fqta6d0u2 uo 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 constant 40 N/mvm,aqn; k+u9t)5tt lu from x = 0.20 m to 0.25tlk+ m5qvntu 9),;at u 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 compressed by 3zu 6h; 3w/,mr kfw7mbh.0 cm. How much work is required to cw;z mwr3 bf7uhhm,6/kompress 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 rewc pp 4);vrau ss(r9-gr3;. -aug jvhjfsl2p6st from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frp(j as )9 vrg --l6.wuphvgjsrp;;uf32a src4iction.)

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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 witttn oy*iegx;3;/8 a*7gfgzikh an initial speed of 4.0 m/s. Neglecting fg g;zo8x agik*/if3tte; n 7y*riction, 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 has a sp- z/eevl sf.gl 5.mzz2stf.g.eed of 9.80 m/s. What is the vertical height of thtslf smlzeze..zv 5 2g/g .f.-e 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 .4h/ahw ezb t3k*ncx*u,lgf ( floor, its potential ener,*a3h *gbecw(z uxhl./ktn f 4gy exactly equals its kinetic energy. How fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight 3q hrzyye xd4 *td(:: fvols+:up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140es:vy+dd (rh:3ol z 4tf: *yqx 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 w 5s2k(ejgvd8e cdod6 .:gg0wlith a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energk.dw jgeoe(v2 gsc d l:d5806gy 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 above thptgjyv5 tz6y e)y,i 42e bottom of a dip (See Fig. 6-2). Neglect frictioj, gz yp6ie4tvy) 52ytn, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bnuh) pn-0/hce ou,hh7ottom o u,7h/ h-0e)ohn upcnhf 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 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 dip with aa zlxy1hk;*;y 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 451hk ya*l x;z;y m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of iajlt /):n5sh 0yh la*xrwge-) ts 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 pulled 30 cm away from the vertical axis anwq+boup+k8;9k :akk fs9h-txi ba y1 ute7z(:d releap zei;ht:9 a+tyk 8k(b-qwa ub:kxsok+f 971used from 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 m/s hits 0ih z bj/w 4jtqk0*i0kiye:oemc-6c, an initially uncompressed horizontal spring with sprinc4/k:i qbjo*0wijk0ye6thc -me,0izg 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 ah80fa euit i7zi+ a7pdezo/) 4t 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force apzz +d8 ifato 0ueih 7)47ie/against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horizonta z3q-1vtdf0hujr 7k:hl surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dist7q h0r 3ht -zvjfd1uk:ance 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 w qc8w3hk)ag2u c60( oow*ii hkex,v 6,c epv9on a rough, level surface. It has 24 J of kinetic energy. The friction force w(vx0,9 *c vh2hc8kg3wo6e 6 uip)o ac,iweqk 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 l o.eq2*6us zq mb6oh5wevel surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the 6q26bq.h*5 osuzme owmass 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 to ar+ mclx-hu7,a lz98rp of a 50-m high slope. If the work done byau z- 8lrxm7l+a9c,rh 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 inclineoc w 94ve4lj17ui;vetsj 8h l;d 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. Whate 1vh9; o wj;t8el7ji4scvu4l 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 frt +a9u,gv9 0,nxqakdt om rest at 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 will be the speed of the mass after sliding 4g+a ,u0q,xd n akvtt99.0 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 fr59g.c 9foom2nzvbf * mj9x l*hom a height of 10.0 m, and strikes the ground with a velocity o9g *h*no xmzf2 fbov9jc9.5 lmf 7.00 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 boys+cd yt+f 8/zn2d2z wr using energy when he runs up a flight of stairs 10.0-m dr 2c8fs/yzwt+2d z+nhigh, 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 vt3v+:bx 1f( fgq2 jvxselocity of 5.0 m/s. What power must be delivered to thest(3xbv2fvx: gfqj+1 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 energy are used by a 1.0 hp 5rb t-cm6pv- l ;bwot2motor that runs for 1.0 hr? (1 hp = 746 Wrml 5t;wbbp-6 v-tc2o )

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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 whi q+u; scdy+ww/le riding. How much force does her foot push with when she is u y/+;wwqsc+d 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/+k b 06lc86xllu ,gbybs in 7.0 s. What is the average power delivybxbkc6l,0 +l68blg uered by the engine? (1 hp = 746 W)

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