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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test60.html
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  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 expres .6k1smn 8cicn stozl;.qc2m/sed 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 )3tzucr bh +2hthere 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 stationar- ivy txe q5qz00vsj11abh0 *yad,-w by brick wall, the amount of work you dov-y b5zv, j0s1t*hx w0bqq1a-ya0edi

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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 held the c2b-n znupy r0kx;8w-ad 0.were. How much work is being done in holding the box in this posi; c kwp 80-nwrnzdxae2uy. -0btion?

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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 cav. k )7jkw(btvrrying a 10-N object, the amount of work you wj7t.bv v(kk )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 ids-6gcm 4/) nli pzd0 tjyu(/tts original position. nls pzi6c /u)y/g4jm (t d-dt0If 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 acting on an object do work on t0gaodz q4 9zol6*6qfj eby cygc357w 6he 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 straig qr cdc 2li2kre(gj6y28c-z-ght up. Compare the sign of the work done by gravity while the ball goes up with the sign of the wei2cg yrq lkz 268(-jg 2rc-cdork 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 versuss/by+;qctv u9g iz -1p position (F vs. x) graph, representss 1u+tzgyq bpic- /v9;

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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 va ui tmo0r 385qab ev,*eex7y/ersus position (F vs. x), what represents the work done by the force F?7* a/emvr 03tb8ux, ioay 5eqe

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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 o(592paw8d,jred ; b .r 8x(fdjrhloyen an object 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 sxrt7fj/xh 9u v -cr17negative, 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 the object's kinetbhj,ii.g+56af b r, : bhy;mcxic 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 5h 3;d +ybkmyctwice the speed of the car. Which statement is true about the truck's kihk5 c+y d;3bymnetic 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 fastwoh r0zg*,2i y as car K, and car J has half the mass of car K. The kinetic enew o0hzi,y 2g*rrgy 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 and bounces back with half of its original speed. vq1remw y )tla/r5n-(z6x l5a What is almw5 enz(/al6yvr 5r -xt1q)the 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 atze-:gf7ny11jiahq rwjcq + ;7 a speed 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 to the rock's m; 7hjc j7y 1ewzqnif:g-1+arqass?

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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-kg9pv)3d02e2( v:x gl f3iu /pzko ubw.3xx xwtg mass is moving with speed 4.0 m/s. Both objects encounter the same conxip2t wo. lf:g2/x(pgk9v zuu3 d0x) 3wvbx3estant 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 1 aco vkyn8st.mii7:s.9 b +kcjqgq9 5of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car ha9:18ygi soa9qqs km5nk+c.jb7tcv . ive skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an elliptical orbh 67v rhdp,gp.ltrb qy :7nw+7it. Neglecting any friction effects, what hapb:dwp77 v6q.rp+nht,yrg l7h 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 prin5*6)x 82*nj d nffsulo .tgt: n1mqdafciple.
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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 6/8s 1;s(fnt nmtmr:asdzpw 4 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 ob-(/0yc/mid5l bpnb at01n-sah2wz s pject with four times the mass of the first if released from the same height. The potential energy of the seco/sa2(b ads w h00b- 1m5/pt- clpnizynnd 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 str u0zpfg; q53dln30soug7xc ()jd0ymn etch 5.0 cm. If another xc(dyj 0n7 nz0gmpl; 5uq o0f d3u3g)s0.200-kg 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 mechanical energy of a scx0zjz1;j m jp .k0)hcj ,uah/ystem

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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 28tg+ xyhx ,u:eb.ffgenergy K, to its potential energy b.hgu8,fe2gxfyx+t : 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;qyw44nak 8 17prvrikbv )o 3j 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 and a very heavy object are sliding w.aatj4;f+l cav*;cxwith equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whichj*a4lafcc;x w a;.v+t 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 7y a9 -3t kzdsq zzkofut0)1q2$m_{1}$ 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 os tn qgr y;1d8v.cdg :3l5+ze;1miu mnf conservation of mechanical energy for conservative forcesm;dgdm;sg.8 nzi ely1vrq3:nt+c5u 1 .
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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 oby 8me zdun2r 7npu :0lga a)4j*;mw0present), to the ground below. Ho p:zn40y;jnae8 ulamm o2br0ug d)w7*w does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 30 J of kinetic energyw 5*i o6y,v2k ;jfrewh. Do not ignore air resis 5 jfivowhr2 e*w;ky,6tance. How much gravitational potential 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 po,lfil sd z qx26a;zqj0u(0 s.wtential energy. Do not ignore air resistance. How much kinetic energy did the ball gainj walqs . z26qlxfu0s z(;0,di?

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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 conservatio(vpomg+qp, ut8v 5fdm3 4urq (8z y/ohn of 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 isupr5cyelyz94qf d.j63 4qk8xmp+6lktp0wy :

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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 po:8qipg8 ilm2ux hf8+xwer 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 po gfigrdvy1.p wt(0 3q.wer?

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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 thnaz gpt a;1+/fe time. To do so, your power outputpz1 /gaaf+tn; 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 en4un kdtk.8 h(cgine 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. d75 aof8b0wmjIf the object weighs 90 N, how much work was done in lifting w75 08jbo damfit?

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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 foamd jzy0i, k3:w 5qnix(.8 nair a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the j, n(i 8.xwqnamz:yko3fi50dwork 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 pulledw.skd v*je:8j7rew w7 upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N forsd e87jw rj.kev:7 w*wce?

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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 un6cb-;sp3kx k fny3f,pward with a constant force of 5500 N for a distance of 50.0 m. kk xc,s6fnnp3b3 y;f-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 wity )i l;f-gtkd9h a constant force of 5500 N for a distance of 50.0 m. What is the net wkdf)9tg -l ;iyork 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 6.0 m upi3i1 z .l/kand 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 sl,,dz b6y(lkev ides 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 sister Sarah in a slq *c2 naq*+asocb*b 8ied on an icy surface (assume no friction), with a force ofb*s+ c nci2*qa 8o*baq 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 direc az-eu;9s.sy1sd xe7 stion of the force. The graph in Fig. 6-1 shows the force e1as; x9ss -us.zd7yeversus 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. ih85hd61 bw8(oqwv xm The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves doi(h1bw qxm6h58 w8vfrom 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. Th1d o*) b9p 8byqjmjryd uj(6)ke graph in Fig. 6-1 shows the force versus the object's p)brj8 j9jd1qo )yd k(y6mpb *uosition. 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 r+e9klj vn xo55 gei o(gle2h+64by. qx h.hj8the direction of the force. The graph in Fig. 6-1 shows the force versus the obj 82 5byxhh+ ln(ghj9x 64+.ele qgk.jio or5evect's position. 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 lf;yv:zwgy8 bc)7h yhs96e;na 55-kg cart (initially at rest) across a 10 m level surface. What is the final kineti v)z8ly yes7cgh9f6y:b ; h;nwc 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 mova, txpj4+e om 94s2p9euxjv.ge a 55-kg cart (initially at rest) across a 10 m level su. mx+avsjpe 9u9jx4o2gt,pe4 rface. 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 0bow kk8y1k9r-naqqa;r2jefjz9 a+: a speed of 5.0 m/s. How much work is required to stop the w k +9jr;2oqr8j kqe ka afabn-0:1z9ymass?

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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 distan*zd m r;bvl(e k*qybcd-0j. ;fce is required to stop a car moving at 50 m/s under 0bz; (q-ye bc*.; r *dfdlmkvjthe 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 cy3o6 -wo/xrs1r) v (a9pgcq zhocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the g porh13 )wrv 6 xazgo9sc/q-(yun, 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 and2 nwzbum4to gu4e8gz*z2ow 0) a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from r *ne82wmzbzu)ot2uw gg4o 04zest, 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 horizontallyu:g8l l8 d ftfw.1.ppy 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 acting on dufl.y8p 8t gwpf:.l1 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 hk t69/-vzofsn7 se)rztr -sb .eight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitatn/6rk rftz) tzss- 7.v bse9o-ional 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 plvdt3:4t uvpu/ v60 gjtane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done bydv j06g3vp4: tut u/vt 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 mmmdfq+zs dw6 56 2a* zuf;3 5whpeiu-to stretch 2.0 cm. What is the spring condiwhu m q; 56f *-usf5d36z+zwmmpe a2stant?

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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 8/ikw*j 9 ed ft0)donuxhzj-p t7f:*rconstant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm? 9ew07)pjx*n /tfh-dk:dt z roj* uif8

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work re xx- 0ekipqpnq;/a/sikf l65- quired to compress an initially uncompressed spring with a spring colfi -/exnsk5;k qi6 p0qpax-/nstant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m from x = 0xg6v 5i+ewc:ob-0ij uo)qpv8 .20 m to 0.25 m? (Assume the unstretched position is at x =) o+i0 5 qvjve-u8pi6 cwg:bxo 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 3.0 c3s 3oa3 dnv)(mpav)bpm. How much work is required to compress m)sn)ad3ppv ova b(33the 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(i kmxlcof 24,v)4i au rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of th2,aicf )ku x44iov (mle 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 wi7ru5pc)mzg72:ax v wl (g x,vith an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving aflx2 vzv:p(ai)cw5 x 7rug7gm, ter 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 hag o*+;au3oy4ih wm4ai s a speed of 9.80 m/s.;4*ao4 +ui m yawiohg3 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 m above the floet mq3y09 gjs xg,g ocb529qm;or, its potential energy exactly equals its kinetic energy. How3g9g;xj 5 tm b9, s2eqcmqgy0o 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, fd 8 ,.-vaophb1 c1g8 g+bltkhblasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rhko hap+1fl8 , dv-8tgb1gcb. ise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of6f571 p:xii lanzhl v+0ksdp6 220 J. At the highe67sp ii +na 05dzvl1hp f:lx6kst point in its trajectory, its kinetic energy 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-lh5r*: syeiz8 5jjiv 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, whi:yir55jj*ehl- vis z8 ch 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 abo -0u96 lwp:luv8qtt.mp4jvytve the bottom of a dip (See Fig. 6-2). Neglect frictiow9pllt -uj.:6pmvu qv 048tt yn, 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 thez8lwac-mj 2af t(atk :8dmm7b 9(3jno 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 top of th bjnaw-m 27alc9f8:8m 3kj(o (zatdmt e 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 at9 k 7i+3b*1fqsyuwsgfx 5; 74i)ha3mluo kktb the 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 pul4vv 1bl-e46gtwqha)hled 30 cm away from the vertical axis and released from rest. What wi w4qbvg ht-6h4vl1a )ell 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 an initiahe-.ynn)44su ydk)p spp u dh +v8r-,glly uncompressed horizontal spring with spring constant ofsph )). p-dnuds4gkh ,ynvyp 4+ 8ue-r $2.0 \times 10^6 \; N/m$. 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 fo6(ub k8 iah-n zc 1p,ctiy2m+hde5v8rr a red light. What w6+c vup8k1t,8bmrh-acezi5n 2y (d ihork 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 60.0-kg object and a horizoplrkwdk)f)h1b iprwns:j8 13x5i /*bntal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stnpb5)*ks:1 fjihdrl1 3iw /wx )8bp krop?

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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 mn/ljlm71s7.fx coyuo;2sy7 vui: + arough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. H s;y 17+7o2oyjn/m uxi:vm.u7acs l lfow 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 massm/r2p p,pyub) p0pkf* 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 my bk2u ppprf)/*p,p0 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 high slope. If the worc+qkf8a8lzznffwdprosn q ) 1 + 488j,k done by friction pnn,jl8q++ fc1 q4s 8fd8r)k8oazzfw 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 andzfh0o:7y d4i4 nh.o(lw4 yfu w 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 the 7u4hnwlf.od4 ohif:0zyy4(w 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 ajzr9xqfsq 0;,is7 9xtt 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What7ssq fi r9;9x xz,tqj0 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 heigha*fyuha6i2;xk:lvv 5 pa( d5pt of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on a;(* paax5: hv6 upy52livd fkit as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a flvwvoc6n7:e , mcu8oh +9num3h ight of stairs 10.0-93u o:onmcew+v7nhc mh, 8u6v m 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 move an object with a constant velocity obgd gkd5a:+hhrjrf7i/53rj .f 5.0 m/s. What power must be delivered to the object by the forc b/g7.jadihgfr5r+ d:5h k3rje?

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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 runs fv f:x;gc;. *xp *guxsq)r*;zlum-gm d or 1.0 hr? (1 hp xmd.*ufqx g ;r*xlpmzg;-)u; s:gcv* = 746 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. How m9o tiwfdr-j; :i*oke 08j qm8juch force does her foot push with when she is traveling at 8.0 m/s?k; 9-jft08jmw:qro*id ieo8 j

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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 68n*yqe)tk. am;fb-swj g m0a 7.0 s. What is the average power deabsmjw0te 86;m.n) qa*k fyg-livered by the engine? (1 hp = 746 W)

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