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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://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://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 expressed in SI units?v s;sge7h 7udu :6gar7

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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 system8wv8x)n k 6nxdw4j)lm 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 4 d9 h8r, xh*0 0 9czzcu9l/i4h9gbpjwoqwcukagainst a stationary brick wall, the amount of work you do9 cc* o, r84 k/ij99b zz09wqxlhchpuu hdw40g

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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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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:o2u/b x5 dg8l2 m msg*nqlqj: is being held there. How much work is being done in holding the box in this pos 2m:/8u lg5:gnq2dqxojb l*m sition?

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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 carryin o,xphsi3nu fmj/wx0.2sh *0y g a 10-N objecfxoh3jy 2uw.h*,p / 0nm s0xsit, 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 i i/tk5i quoe5o) / 2c7aj2cxgvts original positi2jo e7/vcuga5o/c 2x i 5qk)tion. If 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 a(c7rzbkd*yvjzk7 zxf(*aw 2h ,zv e) 23p lil*cting on an object do work 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xxxxxxxxxx，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 straight ut smansof;ip :h1y*)4zand :;p. Compare the sign of the work done by gravity while the t;sa* m z:1hinodysn4f:; p)a ball 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 veporkfkn:4 a -4d tlzb97 dqg77rsus position (F vs. x) graph, representsnqgtz a kfd9r4k77 7o4bl -d:p

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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 vuigiv1 6u0i++vnmcemdw q6 4(s. x), what represents the work done by the forcm(ngiqui4e1d6+ mu6c v+wv 0ie 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 obtsv4 l*thd 67zject is positive, then 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, thencgomes ;whd2r84la3 ; 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 0okmn4 6v n.d8i;mv-j snbo6tzrf (5 ezero, then 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 as much as a car, and is moving at t,k ws2tpmp:n2 t3wx l8wice the speed of the car. Which statement i,m:kl twp 2w 3t82xnpss 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 93( qlveso..9dts0yjq8ir r e car K. The kinrsej3e.vot qs . qi(0l9y9rd8etic energy of car J, compared 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 anxr gp ezitaru,nr tm q(2 7v89qj/5d3)d bounces back with half of its original speed. What is the ratio of the finalez mq t 79trdu(j)qv8,a 2xrirp53gn/ 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 aktz2n ig7g bll-26c /o pebble is moving at a speed of 5 m/s. If both objects have the same kinetic6c2/2 gi blnzg-7lk to energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass ,o+1ietool si/tc4a jt+ (xv-is moving with speed 4.0 m/s. Both objects encounter the same constant braking fo-+xt slctvjoi/o1 ,i4a (+te orce, and are brought to rest. Which object travels the greater distance before stopping?

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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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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 dgqq:n;;z9 h mbjbu6j;istance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, unde j;u9qgb;hqb;nj z6 m:r 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 orb aff3;/6mw8gqr4rijck zoqm7. ( 8jfka t5sc*it. Neglecting any friction effects, what hapt;7 4 a/.(js zcog68jafkqcfk 5r 8ir*wfmq3m pens 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 prtx*;s nmsa9ah::)k fainciple.
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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,zt7u y rwe4ze:cpc;d :qthw-di5 8(r stem 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..( unitruluga1 7jjt1 5ujq;+ A second object with four times the mass of the first if released +ug jj1rutjtu;q17.l 5 n(ua ifrom 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 sprinb6z+( snd3dry ,obx;/( v oxj0ln vle1g causes it to stretch 5.0 cm. If another 0.200-kvl(b dj s1+zd x (b,r0y6;onxel/o n3vg mass is added 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 mechanicalo og b wsa3*7x45gv(1r*x 2njtp6lghn energy 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 i9aa i /6aeq0,g4ba lihts kinetic energy K, to its potential energy Ugbi94a,ai l h a0q/6ae.

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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 hi ri w3jb2g(wv5b 18bogll.

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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 sliding with equal speeds sh58 . keiur01ovx6hialong a level frictionless surface. They both slide up s16 ie u ovxir8kh05.hthe 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 ykyoauehb; z(/5; 51qq6 m psm$m_{1}$ 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 ebr+a- k eqvw62nergy for conservative forcesab rewk+26 -vq.
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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 frictioziohmlb(f wl)9 :3x/sn is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the buio3fxm9hi s )/bw(ll: zlding?

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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 a m9yn5-hvj9iqnd gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? vh9jmyin95q-

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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 potentrvz clv1akl;-e.(p 9qial energy. Do not ignore air resistance. How much kinetic energy didqa pvr; v e1kl9l-c.z( 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 energy.0tox 9qq p;1sk
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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 is4td6i 3r:79kig uw eik

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressh-gitbsk oh qw3 -ot+6xdqrr30b+ .:dk2jg*ted 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/guut (q*8 ciotbyp+ d 77hd0yh 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 the work in one8cun,(nlmqa;56gr p rre,t 5e-third the time. To do so, your power output must havemrreua5,l8n6, 5 e( tqpcg n;r 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's enginlzr8mm p1v *zs(jyu (4e 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 heux pi63r/9t1zeq a4 rdvg j7vu6-jv:eld there. If the object weighs 90 N, how much work was64x g1re-e7r q/d apjviujvt3 6u:v9z 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 distanc5 dzl6d)j :hafe of 1.0 m, at a constant veloc5 fzlhj: ad)6dity of 0.50 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 upwakyimcgaem i, 8g)-6y 6rd with a constant force of 5500 N for a distance of 50.0 m. Wh- ,iicge866y kgmay)m at 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:z*m k(sh* g-cj5vxstr2v q,g pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by tvq5c 2 g(vks-t,h:*zsj mx*rghe 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 d h-ew4y / i(kgz3w0qu9lv4gua constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elul -gi(u0 hz9gw 4wv yqdke/43evator?

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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 upybbnzqf :cby s /19(3.5rrgpa 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 dow1(ojb8z1wj h ln a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fri (wywgq5/coaxk219i m ction), with a force of 60.ga9iww/ c(yq 5xk1m o20 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 directiotub 9u9)kqnko n7sfaq;p+m.8 n of the force. The graph in Fig. 6-1 shows the foq kt9u n q na9f)b7pumk8o;.+srce versus 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 direction of the force. The mhx5 wc) phao; jz+),igraph in Fig. 6-1 shows the force versus the object's position. Fin+w c;)mhpzx,ja 5ih )od 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. The gqh. m/ ceu:5i7i )b wlu4npxl( dl8cprbtu463raph in Fig. 6-1 shows the force versus the object's position. Find the work d prm 67nbll.ulupc u:q/wi8x53 h(ebi4) c4tdone 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. 5 5rbz 8)sl1lqv 9djlbThe graph in Fig. 6-1 shows the force versus the object's pdbslqz5 lbj1)r89lv 5osition. 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 200 N is applied to move a 55-kg cart (in2*a/*g -nwc:s kit,x r 3dajjuitially at rest) across a 10 m level surfaj3:rxt sa*ac,k u/wni2j*gd -ce. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied t, mrg;fpa k/n,o move a 55-kg cart (initially at rest) across a 10 m lepga;km n, /f,rvel 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 required tochp ps1sk6 ,o)-3xwhh stop the 1ch,6p- hss)wo3 kp hxmass?

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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 sto 3y b4*anx hpsk ,.ozlq6d)o/lp a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s ulz k .h)o,sbd*64xonyl3 p qa/nder 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 10-g dart. It is cocked by zl45q*nzskk.zzo 8s /cw r) v7exerting a force of 20 N ovez)wv sc8 zkk4/z.or* n75z qlsr a distance 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 ahmk,+ vjl)v0uuwf)ent e0+f+ nd 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 horizontally along the floor. What is them0vtef v0 n+j+uw)k,+ fuh)le 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 02nvsls dddr 7-a*/c mf5apo-of hay, striking the hay with a velocity of np0o af-d*s2dld sv/ 7cmar5- 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved fr:ncy9p9 rlezr5dl : 5yom a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change il::dr9lyey5 5cpnzr 9n 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 gd5;mtzgu, :z4 e n+ybis 4.0 m long and rises 2.0 m. If the plane is frictionless, n:dg+, z zg;yme54but 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, causes theang44v(/ ea7ur,yvqn1( *, - ben fchvtn(pe l spring to stretch 2.0 cm. What is the spring constant?f/qe egc1(a4lv n7*n (vb(eth -pvarn, y4n,u

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterizedm ko il5n *qb*28mxb9p* k4jj(rb s/xe by a spring constant of 60 N/m. How much potential energy does it store, when stretchekr/b(4b2x* *km5 oi xnq p89jbsljm e*d 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 cokqa:vsvtnf,;v df di5/,q+b /+ w1qgg mpress an initially uncompressed spring with a spring constant of 25 N/m bq /vwfi/5 k; vg :atd+sdf,,qbngq+v1 y 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 constant 40 1) sfr. olo,ncN/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is al. coos1,rfn) t 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 cbio:rys80 /emd di/6vonstant of 15 N/m is initially compressed by 3.0 cm. How much workv0db s8y:e6m r dii//o 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 from rest m u f6xgf -b+jl:k4o,vfrom the top of a 50-m high slope. What is the speed of the slier on reachin6 lvx4f f,k+o-jbg:mug 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, pushereg uvwco/ ykv8u2w, o6s4o 0/s off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after d8vuo6s /gr ocko 2u,/v4wwye0ropping 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 frict+xe .2uw*db p-oy *aomionless inclined plane. At the bottom, it has a spwpax.o* +oe*y d-bmu 2eed of 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 to the floor. When it is 0.70 x+)e 1s* y5mqwc4sjzs 4squa- m above the floor, its potential energy exactly equals its kinetic energy. How fast ismj 4y uas+wez1x cs)q4*-s5sq 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 1oi/ahi,f: s8 o0 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is o iiho:f,as 8/140 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 leav6vcy5 t o-f2z7s(gfopes the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what veop5y2g t fcz 76fv(o-srtical 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 po mi. qwws(hu;ej9i ov-p96n; v.uxr9lint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of tr iw; p9s e; vjwolqnmviu69 h9x.u(-.he 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 at6w kvh(i;5i)xtf, oik 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 bot65 viwt)o kx;ik(,f ihtom 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 poiwu3* bucuw l gc:(q/d0nt 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 coastc/ub :u0w3w qulg(c*der at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the) tu04qi s.t rgo+d,f1uj ,tmx 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 pulled 30 cm away fromt(*.ibcy arc y 1zv/vgm0t m1qc1v;/ v the vertical axis and released from rest. What will be its speed at the bottom of its swi1(gqmtmy ;c0 va yti/z/1cc1 b.vrv*vng?

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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 uwp8owe.w+k- a9jf- r vdl h8zsv-80fyncompressed horizontal spring with spring constaweld+.8z a-8w8 yp- vjvs-0 wofhr9 fknt 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 .xion- wjxl p2u(y+g ur j5,:da red light. What work is done byjj g-yxp+ri:2xln5.wu d ,u(o 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 60.0-kg object and a horizontal surface is (fy sysdl (r ttm9*2 agwn *6y+4f-ebg/7vidk 50.0 N. If the initial speed of the objeg- nyy g7tldsmta 9(+(*syfe4b wifvk 26d *r/ct 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, l0 1q;csm ubnio:7ra.o evel surface. It has 24 J of kinetic energy. The friction q ci;sa no1r:b7mu0 o.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 ho i4m ny(ei,i+hrizontally to 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, what is the change in its kineti my4hiei (in,+c 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 g1:2k)q(vtuq 2iyl x,gqp i5t zahe0,rest from the top of a 50-m high slope. If the work done by friction is 2tq:eg12,a kh5i,zy0iq)q xtl(uvp g$-6.0 \times 10^{3} \; J$, 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 it t;m*d4:dm h dw4eo6ivd4aw:nclined 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 average friction force on t :*:vmw; m 6o44didaeh4tdtdw he 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 planav40 vk z2r;noaj5 ),q0xzbvne 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 4.0 m along the planozx;,z4k0vva v5a2jnq 0r)b ne?

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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, ,c6uab /2zp) g fpr9fzand strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on u6)gp92 b/cfazz,fp r 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 e 0+lmyy8gfa7 w 9up8sxnergy when he runs up a flight of stairs 10.0-mxu 8f8yw9s+0yla7 pmg high, 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 movzvo5mei)gnys 6do : xt0u.*j:e an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the foom.*)oyjn t:v:d0ugex 6z5 sirce?

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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 that run2z:fw:z5pcz) 6m +mqovewu x2s for 1.0 hr? (1 hp = 746 W)fwzqmzu+5wp2v: z 6 cx):2emo

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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 atweejp/4a55 w uf c*.wn the rate of 500 W while riding. How much force does her foot push /5ja. ufpcewe45n ww *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 tmv oh0b6 v:q1s+7gfrbo 25 m/s in 7.0 s. What is the average power deliverb 6v bvqrf10h :ms7+goed by the engine? (1 hp = 746 W)

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