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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 unia; ;h(yt rxx2bt 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 awjvsjqc r*9n ,*)ben , 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 against a sf vxne/nq a:9n c7u78xtationary brick wall, the amount of work you doeax:8 xf9 /77nuvqc nn

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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 being heluh 3q3bjrcrx663 rm k4d there. How much work is being done in holding the box3 6rbhc3qm x4j3ur k6r in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity 1qdv7us;ymg7 nh1: al carrying a 10-N object, the amount of work yvmqs;77y1 dnauh:lg 1ou 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 verti(qpawib2-*a9st /o up cally 3.0 m then returned to its original position. If the total weight is 30 N, how much work was doni 9p*(pws aouqt-b2 /ae?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetaln g)l0 dpwc3m3d. p-jg force 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 0 9bpmzk 9 bj9k6:i5tjom4owyby gravity while the ball goes up with the sign of the work done by gravity while it gotj05k9om 969 kp4i:yzbmjw boes 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, w8b-; enxv6j ion a Force versus position (F vs. x) graph, represents6jvb8; n- iexw

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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. x),gl-ul-k(e,, sir j :bh what represents the work done by thbu,eksj -g(l:i-r l,h e 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 kinajf 8 y6)su.v-c vj. xkxigwi q7*bvfb ((r75xetic 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 negarlqc:mc96xzo-b z .qk uv-9t )tive, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then t/w8 ;tjvnh2sh he 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 twicn9 y tczb/nw64e the speed of the car. Which4 c6/tyw9nnz b statement is true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has hal6q+xicn+06z+9wcr, wzyi qv mf the mass of car K. The kinetic energy of car J, compareyc0mzqczw6qx ++n vwi i,69+rd 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 baij i*d*p7ncyv *l sblms ;f-43ck with half of its original speed. What is tsj4mbfy*pi7l; csnd3- l*v*ihe ratio 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 sp4c;+(z p g) mgdol7gwjeed of 3 m/s and a pebble 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 tz d4gg7j lw+cmop)g( ;o 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 2.02:(ec uo ,laegf/6zmx/ f1 0yob;abpi m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels :2i/ gl/(f,ou1y bpcoxb ;mza0e6a fethe 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 ski2uevqjmay 2k/z+i) -t d a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the cj2vat2i zeq)-u/y k m+ar 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 makknl pwfu)p 28a0bu)+sjl 08 *l0ucrkss orbits the Sun in an elliptical orbit. Neglecting any friction eff8lwlksp) nlrpb800kucuu0 f )+k2*aj ects, 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 q 4 kizj0fxyz b3n0h0(principle.
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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 haz1,t weu 1q7chve negative potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the ground. A second object wi .d aso0j8yzk;5bky: fq2)bkith four times the mass of the first if re j;dsykb:b20oqiyk).z f 8 k5aleased 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 causes it to strei: pevw8:v8nsdu7 y(btch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the new8p v :d8yvs(7u:ibspring 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 p+1c0*lgpr sc lww m)2*i+u sja 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 jh (asa*m3, c4x bd9ed8g+bnet g9vt(K, to its potential energ va4ax8c hb g(tje9+,tm d 9eg*bsnd(3y 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 yr1s7r -rda8m driving 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 +zot)qh8dmys g 8i7t8and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionle t7g 8m88qsodi)z+hyt ss 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 w:y5jrc.qngkbo) 5( 94mbedy$m_{1}$ 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 cpnq7 wxelq/ su4t5m0i4(w +f forces4x(s+/uwq0telw4q cn 7 p i5mf.
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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 frictifxwq6jz)1ab6/n + 5a2b udyvlon 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 tv 5w16a+j6yz 2/bqba )ndfxu lhe 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;d7 ky7cx ) q3pxa9enh of kinetic energy. Do not ignore air resistance. How much gravitational ph 7akd;cn ) xy7xq39peotential 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 gr ,4dmfs5zoz .bavitational potential energy. Do not ignore air resistance. ofsdb.m5 ,z4 zHow 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 ,ww 0u,t4aho6 (ku jriof 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 isjmh/z 0 hkg5a)

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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 ecc4sbposx6tkk)0e 6 tb0p 4 7dxpressed 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 oe3sw7ddf 9 ldj,p.zp5f 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 one-third the time. To do so,,if:; qrczu9x youq,:u9c; rfzi xr 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 car at a constant acceleration, the car's enginqn-o )l /kk;ple 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 e2e d+)mucw1 qetrm*c:. z6pcthe object weighs 90 N, how much work was done in:cer te*m.6p mcq e21w+ c)zdu lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, at a constanl 9s5qo)6cv;ogn+v owt velocity of 0.50 m/s. What is the wo5 9scovo +no;q)6gvlwrk 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 force of ((aanddk p7.enbirl , d h0ffgu;8: y.5500 N for a distance of 50.0 m. What is the work done by the 5hfy((n 87u :di dgkn 0e.fabpra d,;.l500 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 isip-w q 9l-)ncc pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of piccw )n-q-l9 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 pul0khv( -r w,in;. t2rmz slez0bled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done h m2 (lz ; -v0ntsr0,rzk.wibeon the elevator?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 upg,(yrr;mxm m;pp+80qwbwebd9hib3;hfp 7 / p 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, inclined gb :hz:g7 -bwrat $30^{\circ}$ 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 li+b07e agksa.x u2y8fh ttle sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an8h0xse.gfk aba+ u7y2 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 th5n4bk9zy f-a ke force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movebky 49-afkz5 ns 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 l:r*99l8rv x*nx) 0f+pvevdz d.t kvdin the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesvl . + kd*d n*)0 rx:lx9rtzevvd9vf8p 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 dir( mq9stqwsp1pv qc/p-m6 kn* *ection of the force. The graph in Fig. 6-1 shm6q c(*svs /tk*-q9ppnp mw1qows the force versus the 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 direction of the force. The graph in F7x* qmom- tfvum6.u 0gig. 6-1 shows the force versus the object's posit76*m-quu o0 vftg.xmmion. 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 (initially attipa8( 4z ixe+ rest) across a 10 m level surface. What is the 4ie( ax8+ziptfinal 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 j0ij.9 *+p2elm bj -us4eqolvqs5dn3move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cle-sj.e s3u9ji+qb45 m0lpv j* o2nqdart?

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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 .i7 46wv abjslspeed of 5.0 m/s. How much work is required to stoilajw6s b74v.p the 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 distance ig hw+.:ytbirf( l; l27ukde5bs required to stop a car moving at 50 m/s under the same condik uw:h2+ir e(ldlt;.5bg7fby tion?

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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 cyxa 0pv ;,gun63gy4x a 10-g dart. It is cocked by exerting a force of 20 N over a dis63;x p0 nc yu,gvayg4xtance 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 and a vertical componenq35i8 w*t30 bhxrzhxrt 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 r qr3w5bx0xhi 3*zht8the 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 horizontally intowai9 c.0 f+n thd0iie7df0; eujki;v5 a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stoppingi;a . d i7; 5w teni9fd0+0vekjh0fuci. 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 abov/ ti jua,tx6+qe a floor to a height of 13.0 m above the floor. What is the change in gravitational potentti ja,t ux/+q6ial 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. T -d8w;2txiv+z:bfo k khe plane is 4.0 m long and rises 2.0 m. If the plwxk2 f-+t zbi:dv8;o kane 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, causes the spring to stretch 2.0 bvt 66n:*k0vbi/t kwbcm. What is the spring constant?: b v66v ktt*wk/b0bni

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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 60 N/m. How much p*q2 brz y) yuj.c3gt h9r5ni1wotential energy doesiu9jyw rq1zr 5ng)y*2.tbc3 h 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 an initially uncompressed spring czu,+8.x i:nne0)e gzr ufx*cwith a spring constant of 25 N/,u egue* ir8)nc zcf+zxn.x 0: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 st9b/lob. 9tr kla;c7 csretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m?/;l.ac9 9colr b7bs kt (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 initiallic1(twnzxvy- w 4ga4(y compressed by 3.0 cm. How much work is required to compress the spring an additio- yw izg14w cx(4an(vtnal 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 ,kwybbp-ev7; 2 s2u11b cglce-m high slope. What is the speed of the slier on reaching thecbg1e vbp skuy7 e 1b-l2w2c,; bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial szy ltp4d5l ssi3e561 lpeed of 4.0 m/s. Neglecting friction, how fpst134lz5 sl di6e ly5ast 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 thezwy2+.77rrnmmj: m ax bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?a2rrmn7 m7x: .mjywz +

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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 th uj;0 eivs o/qg ;c9kwo/c90bie floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic s i; qju vi0o/0bcc9 w;koge/9energy. 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 up from ground ly 1spa;+7gp zwdave) 2dum:5rzoc4 .. n9rnyuevel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertic:nu. s ze9mpp5gd arc a.+onz27y 1vw;ru)4ydal 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 thenasrwrimtqqujw +7f i )6*-40 ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, diin+wm) t40-7jafq* ruirq s 6wd 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 p2ktw+0t(lzf ;ulyt a 4oint 45 m above the bottom of a dip (See Fig. 6-2). Negle tll(yuwt2ak4 z+0f ;tct 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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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 qmv b7 au-4kr9point 45 m above the bottom of a dip (S4 ba9kv7q-um ree 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 wi.5nw yvl*siw 7th a speed of 25 m/s (See Fig. 6- lv.*yinw w57s2). Neglect friction, what will be the speed of the roller coaster 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 bottom of its swing .1kg9i4f bb, p owfko;(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-,,q56 5u wdsr kr9ce:rtoaf a is pulled 30 cm away from the vertical axis and released from rest. What will wrr,c , qd :rt-5ea 6uks5af9obe 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 ntd1b5snz 5uk7 yi(ed5 g bf-5hits an initially uncompressed horizontal spring with spring constab sfd(d z557nk5ntibg-ye5 1 unt 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, slo7 x 6u3orurx(vtn,*tiunrt :+ ws down her 2000 kg car to stop for a red light. What work is done by the friction force against itvurrou,3n(6x utr*x+ :nt7the 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 an;u5u/71uwo 1dt lfamfd a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s,u7tfo1uwadlm15; u f/ 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 o(rythn2 al54 7w:o 3, 8u eeiird3mlguf kinetic energy. uln o :wl3uer yrm3ag,85 td e(h27i4i The friction 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 horizontall-8-2dk wxn n34mmevmay to a 2.0-kg mass on a level surface. The coefficient of kinetic friction an 3dkmxv8 m2e--nw m4between 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;m0p9za4 e npj high slope. If the work done by friction isepzn4a ;p0jm9 $-6.0 \times 10^{3} \; J$, 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 plan9vwlj 1 yiufp:o,ad)lt.6 )8imoh d g1e. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get thapg1 i j: t1vd. ),mlyo8u 69wdif)lhoe box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane inclined i -k9z5a*sv bzkx:cm5at 20e above horizontal. The coefficient of kinetic friction between the mass and the pa55mkkz xi*c9-zbv: s lane 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 ground wirk0 4 *ll ;wcbs;n5injlc ./evth a velocity of 7.00 m/s. What av ;kel*4. cli/l;jsv05wn ncrberage 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 box eheu7xy )4-: 5jztqky using energy when he runs up a flight of stairs 10.0-m high, iuzj-k7tqe) 5hxx e4:y n
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 conmhv+vp b(g , 2xj-,gmsstant velocity of 5.0 m/s. What gvg,pxbh-s+m , ( v2jmpower 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 energy argtd uvrj b9.i+.t1;,ngscm c5 e used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 d.5 .tnsc9, gitc1 b+grmjvu; W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while riding. Howy*-0g,zzz rg9 +mnt vj much force does her foot push with when she is travel* nz0gtz-+9m vzr,yj ging 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 t yj ):;dya0aeao 25 m/s in 7.0 s. What is the average power delivered by the engin;yyae ad) :0aje? (1 hp = 746 W)

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