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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 expressed in SI u:+l d tt;zy1l*)7 owpqh2tk vinits?

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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 w 2vw*2) r4rkszvc0j;tb dzl)5ny8 zqa 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 stationary brick wall7 , cr3mk-vc:mp tq* km.1of;0yvbmze, the amount of work you dok1vomyc bqcf.p*k;3-tm rvz ,em0m:7

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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 verr1+ mlioroz :6zm(1x3m;cjml tically and is being held there. How much work is being done in ho 1lo(:+zm cmr ;iolm6z3jx1mrlding the box 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 har)zh/azkvm3 )1. /wyaj 8ng at a constant velocity carrying a 10-N object, the amount of work you do mn.) a)8kgh yazrz/h/av1 j3 wis

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to its or.mz j 2*r7qjvbiginal positi*vjqrb2zm .7 jon. 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 acting on an object do n+ t ;wlxhr;ocr3mfnh/)d 3cq i/a82dwork 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 sxd7 l punds8),7uir8ds9 y6jf ign of the work done by gravity while the ball goes up with the sfd 7nrixud, s su8jp 7)6l89dyign 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 vers20-s(+d7jvajawr5ewj i ud 4h:tn1gjus position (F vs. x) graph, representsvni a(hw-jrd0 5sa7ju:+e2jj1wtdg4

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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), what represents the work done byj tpnl70y o8efa. d+v: the forcj :yae.7od 8ptv+0nf le 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 positieb 0kp2 w)unr+qh,c;ave, 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, then the object's kinetic enrq+acp/3 kar;ergy

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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'tfz34xsqg3 ; jcjavq8,ou2 (p 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.b -;enspuz- q is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that op b--q u;zsen.f 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 jw8+blb04 b7i:y-3 *iyrii2 sfvv pf jmass of car K. The kinetic energy bib fy*bl048fs iv:iwp -j 7iv+2rj3yof 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 originkz7c)7n7it ajj0- hbnal speed. What is the ratio of the final kinetic energy to the initial 70 z) ab jjcknth7in7-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 eb02l/vic .cd and a pebble is moving at a speed of 5 m/s. If bot l0iccbd/v. 2eh objects have the same kinetic 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.t.lx :8e k)ujmgug llq.tr68 /0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are broug8 xjk u ./llrgt .)u8emt6:lgqht 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 4if h4z ;x4mspcertain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, und4;4 sizfxp4hmer 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 lplnv7s3sd,.c4 2fxw orbit. Neglecting any friction effects, what happens to the planet's kindnv7,llxsp3c. 2wf s 4etic 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 pbqk9gobt7j* k;e., frrinciple.
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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 aq9c ublkcwd 5- y;fg(5 system 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. A secon-) 0 h co;mddi8 8 :uiqj q2ve8vhwjfamnqj)49d object with four times the mass of the first if releasehj 9me qjuoihji; 4dd0)v 88n :) q8v2mwfcaq-d 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 s*g/q c jy+hl-kpring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sjhyc* lg+ -qk/pring 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 sys b09u02 gqqdtbtem

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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 x te70s)gn bss(,n4zp energy K, to its potential enerpsb)ns , (t40genz7sxgy 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 o 1 3fifvr0wox(ku0 tg(7wu e:ff a car 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 heavyo5ip n-wkd.; bib*bngz., /n r object are sliding with equal speeds along a level frictionless surface. k nb5, db.-ognr;pn.*iwiz/b They both slide up the same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses v 2 wdvf6t7uf a55ukk:7 lobf8$m_{1}$ 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 conservat*a5+*yydh(j hd; y.j dcw*zqyion of mechanical energy for conservative forcesj.dd5 a( yq+y*wh z *yyj*;cdh.
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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, throu*j f qlsi 20u4r/t c9aew6mg8ygh the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare t*tu4j w0 r6lqef9 8sgciy2 m/ao 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 kin7 4lh9d;q 3czumk,ffd s83o knetic energy. Do not ignore air res9d cm4ouf38skq z,h d 3nk;7lfistance. 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 gravit .+b;btmwk bzy+ m2vj/ational potential energy. Do not ignore air resistan.b bw/2mt j +;kvzmy+bce. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of eneph cya*jej 94h; ae,v9rgy.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t is.,g 30vbvldcn0pcd tl c1 p(re,,nu6i

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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 expressed in SI units?e: orx4s of,2g

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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 unit0/c5qrp /r8pbfspyu ) 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 timesl90x yc6es(dg the work in one-third the time. To do so, your power output must hav9ceg d0s 6l(xye 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 c81xy;*yjw8 cng;gh poar'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 verticwisayb 8ltty 3fv4+o u5 -c/i8 7nck-yally 2.0 m and held there. If the object weighs 90 N, how m37w/ lay4 b+ 5tkvcft- 8n-sioyi8uyc uch work was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physr3 m5+ 7z scpkb.5utlkics book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the wos35k z7ml.+u pb trk5crk 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 up;wn*4 h-k a +0fapljwpward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N force?w;+*f-p0hplkaawn 4 j

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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 ps/8sa 5btdc6 fef 1))plk,vpnulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the works)a c b8f )s p5ftdpn/l6vek,1 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 upwa ohd//hrj6xx- rd with a constant force of 5500 N for a distance of 50.0 m. What is t/d6rh /oxj-hxhe 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 6.0 m up along 1s e:j.*kvfpe 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 hz /z;qt ps.tem(rlre ,.94furamp, 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 9+7)h aa(k bt3 oun8noutcsv2sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle bn2 t aavk3u7s8nh(co+uo)9tof $37^{\circ}$ 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 the force. The graph4 3qm*p od 0bj(l;;(favun pvk in Fig. 6-1 shows the force versus the object's position. Find the workd nq0u3j(vv( oa p;b;pfl*m4 k done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig.itm t3e lv7- 7(zwk/njuq-ef siuk21m, dkj34 6-1 shows the force versus the ob(uifsk3wlkt 3ki ju,-jqmn27te 7v- /dmz 41 eject'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. The graph 6owd4cia8 e;*as8p g8j5laf kin Fig. 6-1 shows the force versus the object's s a8 f848pjwae ;cl*6kgdao5iposition. 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 obj:g)v z :nb.dfc /h4ggnect in the direction of the force. The graph in Fig. 6-1 shows vc.4n fgdn gg z)h:/:bthe force versus the object'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 r( xec tji*o. toqu7tf*r j86;a 55-kg cart (initially at rest) ac8jf(iquto*6 ;xr7o*t cejr t.ross a 10 m level surface. 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 applvcu2 ,voi5a8lied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is 8,lvu c2ioa v5the 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 wkx1w8hoc-b1wu sf 1lm4 ga+f(ork is required to stop the mass?s a(w f f4w8umcl1k1gxb+- oh1

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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 dista4wb0wqkdjki7wn+wd 6l 6 o,pm/ ++au hnce is required to stop a car moving at 50 m/s under/in ,qo6 6dja+u+ +d4 mk 0wbplh7wwwk 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 u3s*qnrs lo/8 dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, ass s8qurs3/n o*luming 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 componeno wpzp 6y- :nvgr*37qdl4jm3ig*.uaxt of 60 N. The force is applied to a box nu*wjv : l-yi. *g7ox34 apdm6zg3rpqwhich 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 shot horizontally into a bale of hay, strikinv;z a qvrk:oxds l6ke.f5h b h(;6ib8+mw0n3eg the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force haqe 0zb3;m;bkif. (rw 5 : 6+hslnvv68oekdx 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 ak28mvbhnt4 j( floor to a height of 13.0 m above the floor. What is the change in gravitational potential nkjh8t 4v(b2menergy?

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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 4v3myz+5*9d z onzvm/z.0 m long and rises 2.0 m. If the plane is frictionless, how mu3/z*5m+o zm9vd yvnzzch 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, causc d5 i-tva;9s9k/ mjkies the spring to stretch 2.0 cm. What is the spring consti mad;c v9t/ji kk5s-9ant?

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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 sdzbj7ed 8ki5f*a gt;(ej f:(qpring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?q d5k:*ez(tbje; g(ja f fdi78

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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 compresslvzk 99v1ct(u ( vx9cs an initially uncompressed spring with a spring c(19 vt(vsvx9 c9clz ukonstant 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 =xwxy+ y:(3pxs 0.20 m to 0.s3+:xx xpyy(w 25 m? (Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring const 4l 2ng1x:lsifrx, k,dant of 15 N/m is initially compressed by 3.0 cm. How much work is rx:g rkl1sx,2d,n4fl iequired 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 from the top of a 50-m high s er v2:k9un.r pate)7h:0g 1nedyf7nmlope. What is the speed :7g0 2ea nk:.hryp7rt9 uem)n d 1efnvof the slier on reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kp -8y;5w u;mauk5 jg k*k:e (uklzcf3ig, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, howjk a5:-l35u*kmu ufikg;p ke ;(8wz yc 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 eqz8j 6 s3:ctt -b)m xzik9d8aiopi29inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height obx2ik pzjit)c e8tam-q6o:s z39 i89 df 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.: 1x ;gzlwatt7+ej/b t70 m above the floor, its potential energy exactly equals its zalt7j:1tb+ wgt xe/; 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, weighin,x1 hjs(b w1az w2wh8zg 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At th b8(zwj 1zxhsw h12a,we exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a k /k07 csj9gy/55(ou srsfyhkxinetic energy of 220 J. At the highest point/x uy5s(c gkrf057kjs yh9o/s 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 meuml:e p41 k,9c lsvg* 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 abos 9e:v *1cmuge ll,4kpve 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 ay qsul: o hf60y*x:parws2a4.8t7 ozs point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller co.8usoo:fl0ratsa hp x2 swy7 4qz6y :*aster 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 oipwqd )p (/u*k+g sff;f a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will i;+*pk/p(gsfu dq fw) 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 kn q0* i+mvs ugh0g93aof the ball at 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 pulled 30 cm away from the vertical axis a,l4kyc6ybnqt8e0 lr* nd released from rest. What will be its speed at the bottoml*8bnyr0 tlqk c4 e6y, 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 initially uncompressed horiz m,c+ligw6n63wv+0;swc vtr +ac2ocpontal spring with spring constan6+s2m ;w6r+w,iwct+g3vno clcc0pavt 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 a red liyi+ zwns 1b+t- 6+xqy/z:gl ugght. What work is done by the friction force against the wheelggz- z/+ xy1l+ nyi+qbus6:wts?

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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 suc(zui3p *9dx 9qoca9(t3/nunx p *xz.0vhbkirface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slo.p(ikqnchid39zxnav( uz9 xx3*cu9t/ *pb 0 ide 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, f pt66 .(9 gxc.uycp*qvfqo0alevel surface. It has 24 J of kinetic energyc.fgqqp. u (x9vpotac 06*f6 y. 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 ax2k2 oin lsvc;e- tk5m ifdg10,2yuj 0pplied horizontally 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 kn f tvc1,-2lyik;j eoxsd2u0 g0 5m2imass 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 high8bi n l1)wy98 pix9tnn slope. If the work done lp tx)ynbi899ni18n wby 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 inclined plane. The pem oi 6ui*3hfe)t li- hpa836qlane 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 pqp -i e6laf3oi)e83t m*uih6hlane. 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 at 20e h dbb:t1 xg2n m /m:(tjmql27iabove horizontal. The coefficient of kinetic friction between th2 1nq7j/2( glimb:bmt:d xm the mass and the plane 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 fro 6(sf9re;jzold /nhr)m fi8 v6m a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as i( 96s6nj)m;foh8rr /zvfie dlt 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 eig* rsr lk..v 4dt86kanergy when he runs up a flight of stairs 10.0-m d lig*.krr648s. avtkhigh, 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 objet-jow q9l q 3x(-lay.dct with a constant velocity of 5.0 m/s. What pol(yjlw- -xt9d .3aoqq wer 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 are used by a 1.0 hp,y4o/coe x eovtd4-n* motor that runs for 1.0 hr? (1 hp = nyveo 4xto-c, do4/e*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 wi :3a,jyohc.a ae u(iw oo (6tl*m78hahile riding. How much force does her foot push la.uc(jo3yi6ham eai* o:7t 8,wh (a owith 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 to 25 m/ y7gtqs i.hms0cc ;*,ss in 7.0 s. What is the average power delivered by the engi mt*sc, ;70sysgqci h.ne? (1 hp = 746 W)

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