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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 ez1.ncogp;be i -ne;; bxpressed 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 systemfogdica26;i8 f;*b0m b 4h ei48 ieoiq 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 wall, the amount of 9xj7 bf s4(kip)nt0fpwork yo9jkxp0b7sn f4 (ipf)tu do

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was liftf),cyk vp5hb.h wnt()o7 n7 gied 2.0 m vertically and is being held there. How much work is be ncwf tib, og.)h5)(kvy7 ph7ning done in holding 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 at a constant velocity carrying a 10-N oy 7x3fk07r1u :cr5 zi)grfhv5*t( i pz uqq(khbject, the amounh0cht q7f5uriuprrx 5:fi ()1k (vyg 7zzkq3*t 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 d mf7gx7qj2yq x5 8f9z9xz-t uvertically 3.0 m then returned to its original position. 9x g x- x9m58ff7zzd7quqyj2t 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 forcx/;0xjky tsh d qw83/ke 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 fl) c ys3u(pkv0ly,2m sign of the work done by gravity while the ball goes up with the sign of the work done by gravity ws0mu(lpy v,y 3l) c2fkhile it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, represents*d.)tg.knb q i)d.i*.bnktqg

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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 dv3)kqf 7,*ia9z 2krq :eeck xvs. x), what represents the work done by the )qird ,v9k 7c2efqk ex3 ak:*zforce 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 o25kp,i9 gjirylbgy6 2x bplx7yx 2hm (igi-78bject 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, thq9 vutrjx14n c 6:*5dmrb iarglvu h,5xl/h,5en 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'ssrm 4bnd07ey9 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 vmks5:a ,ercc71n6dp;)rc qln*. okg at twice the speed of the car. Which statement is true g*n,nlsk kv6)rdc;.e5c17oa:qcr p m 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 Khzuf+u/s2cz5h/uet7 , u :fmq, and car J has half the mass of car K. The kinetic energy of car J, compareu+ 7 um/5z u2/qfthz:eu,hf scd 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 ands g 1j(os( s5y0settu, bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kyt1,so( ju 0 s(5sgsetinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of hg-) bhto +;1wlm cvl:5 m/s. If both objects have the same kinetic energy, what is the row hv+ :l;-)hcmlb1 tgatio 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 is movi*goe xpr g71/r(h-ysmvq,8h o ng with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before sto- 8o/x ,rg me(7gyph 1*rvsohqpping?

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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 car3;yfu c +ne-wow y+6ug in a panic, and skid a certain distance on a straight, level road. If you had been travelyyn3+owe6 w u+;c-gufing twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an ellipt8f q )1;2f af (1aqipck-cusnlical orbit. Neglecting any friction eff81ifs(acl n fqqcfkp ;-a 21)uects, 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 principleqmhde2 2gj gxqrgr5 87n02 90abfhei1.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have negative potential enervapsmi:1ai ,s(84 wc k00kufmgy?

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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 8kyu(p 3zo1dm 2pa7-fbtg4vafrom rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential u7d84b 3v- ka2z1( agyf potmpenergy 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 stretch 5.0 shvaaxlz4er70 a n40 *cm. If another 0.200-kg mass is added to the spring, the0e4hrlv4a0a* axn 7zs 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 s c0zon) oo9 5mycx4pr4ystem

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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. Compar+ rxf9: qo,lc w hdfsh1/:r.lae its kinetic energy K, to its potential energy U1:fr h .dalh+,osrc /:wfxq l9.

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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 arm1c;)lio b.2x bpbt+ 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 with equal speeds )tn-v nun26; n hygn dy43ch*salong a level frictionless surface. They both slide up the sadn- cy2 nn64sn3g* vhy u;)hntme 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 kq: v)dql8ju(pvq)p ( nv5m0x$m_{1}$ 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 conservativ ,v2v )sxu )qxne2-7qqelna8ce forces.ls x7qq)-, neu)n2exv 2a vqc8
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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,z4tejw fz)d69 zhmsn(i+t:7 l 2tg bx friction is present), to the ground below. How does the ki:s9z,efi+d tzb2 t(lw7h n g6jmzx)4 tnetic 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 goq.5f dnzygrv -6 zd,jqoss- d0d; )0mains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy di,j5;vof-om sq)- 0q60zzg.sdyddnd rd 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 gravitw -09t 6q/fzlyhuwd-rational potential energy. Do not ignore air resistance.9thd0uqf wl-yz/ w r6- 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 conw ai* labs*r cag7d,s3 s-*-ltservation 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 isy vy 93n/lhl+f,mswi6 u18bje/o+ k aw

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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 (oa7pn(.8hl1)cjiw yvdizb .unit of power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit of po aagfz3r q)i3b8vvq5 .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-thi k xdd: +zl,gani4)-qkrd the time. To do so, your power output z-,axql:kdd4)i k+ gn 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 enggm4sfmq+ ,y/a ine 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 ther4 x)ug tgn8ut+e. If the object weighs 90 N, how much work +x)n gt 8ug4tuwas 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 bc;ym6x m y d(xat;0qveb9b2 n.ook up in the air a distance of 1.0 m, at a constant velocity of9y;6vbt mn0 y(c.qambdxe; 2x 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 upward with a constant force of 5500 .7w oiur6/ydfv qj)g( p ,+jakN for a distance of 50.0 m. What is the work do6)j7vw ogrkif. qja,d u +(py/ne 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 pulled upward with a constant force of 5500 l :pk(elx8 kh+bxyv8.N for a distance of 50.0 m. What is8+b xvl.8xe:(lhy k pk the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a cons9yt 0eip 7;newtant force of 5500 N for a distance of 50.0 m. What is the net npe ei9;t7w0y 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 * 0ygk )j(tws39vtoc6x a9tanalong 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 ra azbl zwi-ki5t3+;u0 cmp, 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 s p5pndv xd2 4ovav;m-9ister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 2p vv4an-5;o pmxv9dd 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 ino qryzvzah8(kk857 * d the direction of the force. The graph in Fig. 6-1 shz88 ok5y hzd(a7rv*kqows the force 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 :s gmb 1bza)kop*5k*;zxfx5 w 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 obj**;5a:)kp1 z wzk x5mobf sgxbect 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 o fc dri0y, g-f) f5mo(:hontyq)x*k p/f the force. The graph in Fig. 6-1 shows the force vm*5/-y :no,p(0r))tqk ofyxgf dhf ic ersus 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 grap: +op (4wdfcqhh in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mfh(w :d+ oq4pcoves 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 at resf; ll zb4:lf,h-zho5l t) across a 10 m lblfzf4zlhlh ,; l:5o -evel 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 applied to mov t mm8ugnjf.;2 uxelh*j i,(pg,1)w cse a 55-kg cart (initially at rest) across a 10 m le2 hu,sce 1ig nuwt,(fmjxlg)m.; j 8p*vel 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 to st qztc 8;8bqy,t-gsh5d kj /vb2b:i((5x yag goop the m/b:x, 5tyq8v;(b-2abo( tgk ydj8g zi hsq5gcass?

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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 mc *tqr-u,etg8/s, what distance is requiredre*c - tgq,u8t to stop a car moving at 50 m/s under 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 bgld;-xbl3r1 hy exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dabl;d rlg1-3hx rt 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 ang1lz;y;qphvj 9hyn0l 7h+z)p d 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 t+y1p)lqhl7 h;;gnjzz0v 9yh phe 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 ismrja()tho/o ,m t m9z) shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates)jo(, ao 9m/ztmhr) tm 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 moifpj,q3 -gkv-ved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. Wha -3,qpgij-fvk t is the change in 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 587qnn f8gt-)wollr 6; fr vcavhtd)*dx uh0(is 4.0 m long and rises 2.0 m. If the planercavl08;l-8*d g)oux h vn56t(rw )7h nffqdt 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 spri5 / )qd z*apsajwno0-p:p9 e7ytv :lsnng, causes the spring to stretch 2.0 cm. What is the spring :* ae)j0q zaps9dltyv:57p p/nnows-constant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m. How(ufj:a1 tynh. v3 ez2y much potential energy does it store, when stretched by 1.0y3z:(t 1 fey.hu2av jn 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 unhv n6-+tv d0y0nsnzyfua 0q6 8compressed spring with a spring constant ofy 6 vau0 08z0hdq-vnntsn6f+y 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 stretrm wc7azpvk2rf hy4)z2/jk :9ch a spring of spring constant 40 N/m from x = 0.20 m tr74 : vafpczkkm r2/h)z2yj9wo 0.25 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 constant of 15 N/m is initially compressed byros6m jc 3o8mqmx* 89a 3.0 cm. How much work is required to compress the spring an additional 6ra38o *mqm8cmj xso9 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 slope.zl3c v zc7av .zx749oo What is the speed of the slier on reaching the bottom ov7coax czl zz439ov7 .f 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 bu/h2 och 5q/nx .j9gjkg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting fric5huj g2xh9jq c/ .bo/ntion, how fast will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclinegk th4)a3 :;za oxvp(e)w/ oovd plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heightpg;axe(t)v4 : kzh )3oooa wv/ 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 yu )9aflj 42a*ehir8i:o(rk:s 6saw tit is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How ria wj (4u roi9ss):la2 kf a8ythe:6*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 pso 24t.i(rrt 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 heig(op2t s.irr4t ht 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 s0d 9w1 vzl(kpm leaves the ground with a kinetic energy of 220 J. At the hip01w9 lsz kvd(ghest 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 above the b+ vtty/kw 46nzui6ea )ottom 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 bottom of yut )na+4vzk6w e6/tithe 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 matyzc6)y4vw0o j;x (a/s at a point 45 m above the bottom of a dip (See Fig. 6-2). 6;j4 wcy)a(xv0toyaz 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 dif-rc m 6zka9q;a :8mztp with a speed of 25 m/s (See Fig. 68ftr6m;ma9 a zc-qzk :-2). 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 1h5gr ,ibd2nk of 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 ish/x,-r-zuxq1 k wkrs: pulled 30 cm away from the vertical axis and released from rest. Whatx:1,/r wz-rqxshu -kk will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncomg f ex8la33w(wpressed horizontal spring with sprin xeg 8aww(fl33g constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at -bs q12gdgcjns65**h,n bqbo22 m/s, slows down her 2000 kg car to stop for a red light. What work is done byn*2bsgd* q ,jg 5q-hn1b cb6os 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 betf;p8 xkyu 5v,q v/je+mween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s+ m,yk qev5/xfj; 8vup, 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 ray-0 )jlzf2ya ough, level surface. It has 24 J of kinetic energy. T-laz2yj )yfa0 he 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 horizon9/xp(rem1.eedun 6 i vtally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.9 np.xiver/e(md1u e6 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 zd3ck/)mzhrzssxqx (( hl+)z p119cpfrom the top of a 50-m high slope. If the work donc/(dz pchh)zrp3zzssl1x k(q9 ) 1+mxe by 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 ru/ji5 b 1qb2xplane. 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 p 2/bqijrxb1 5ulane. 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 1 t 5ic5l3.7tlmrgufdabove horizontal. The coefficient of kinetic frictl5r7tl. tu13mg5 dicf ion between 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 from a height of 10.0 m, and 6j9b (pcu,jv 8 7rqfgzstrikes the ground with a velocity of 87(g6r,cvj zq j9uf bp7.00 m/s. What average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a i -lq1oo 6 bszvmt1ieas.k2l n(dwm4 i-v7t1:flight of stairs 10.0li7 4 bt-s( 2v.sam-e1k m:16o 1wodilqnvzti-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 of 5.02 nb7nt5wxzunoo56- o rr76b m m/s. What power must be delivered to the object by the force?65 rmu6w z b7o nbt-oro75xn2n

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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 use9dzo;j 0g w2a (t*kwjvv*u7fx d by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746x2j9 f(7;dwv*0 vwjzuktoag* 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 r/visce+j ja) (iding. How much force does her fooc jej v)+/i(ast push 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 acceleratesxd5klfzs8tk2 4e ngc-m9 u0b) from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 Wdn-lzkm 2ck95 sbxfg 04 )tue8)

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