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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 unitsskfbo4 p5qp2/x63:o w lmwy-v?

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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 src;9f( fh 03tabkr6u hhytt 1.ystem 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 onw:i64 wcf+ lbrick wall, the amount of work you d 4w n+c:6olifwo

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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 h/fd m(i c/yzg/ i9xm)us qq85and is being held there. How much work yfhim)i s5xq89cmu/g/zqd /( is being 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 xct2mmnyf6)y )i * ciy9s4,w+ww :gmkobject, the amount of work you dof6)ni4w2csy wg xmmy: w)t+9* cmkiy, 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 :d/duk j+yq54/ij b q ymtds3+then returned to its original position. If the tdmtqijbqddks 3/yu+/ 5+ y4 :jotal 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 acti ,wz z3pn)yf, y;4zoptng 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 th) zvwck*ytl/ xn,j;h0e work done by gravity while the ball goes up with the sign of t;n)tx/*k0wylhz vjc, he 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 versus pmo()4id9ocn qosition (F vs. x) graph, represents9o iq4c(onmd)

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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 4j80)bwcolc cys 4jxq* 46zgsby the fo0b4y6zj 4 *g8xq lcwcj 4)ssocrce 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 kinetic energy-)cyhxwxd 3 *d06z4)xroxckp

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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 kine bp gld2 w.jp* tn;dz42u2vi1utic 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 objec0th/a dy (hcvfk9cw4 ef*/e7dt is zero, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as muy; 1 weyr qp27fiv;j6jch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy comparef y6pjvq;wej2yr;1 i7 d 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, anda;:cwc*vy7 fz car J has half the mass of car K. The k:v ; a*7czyfwcinetic energy of car J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bouyw0mkfi lc9 49nces back with half of its original speed. What is the ratio of the final kclk09wi 9m4yf inetic energy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebby7mvta q )2 ks,*0t4dwcr8 agble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the rati,0m a tgky*wat)cbv8q27 dr4so 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 j5 0.nvhw (zno9c a2k1 4v rcjeyh9;lpm/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encoualyw0j1v99 cc;(h k2r.h5 jon nev4pznter the same constant 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 of your ho1 +q bmmop5fvvp41 )car in a panic, and skid a certain distance on a 1 oq vo51+4mm)vhpbfpstraight, level road. If you had been traveling 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 elliptical- 6-1knm abyl .eicl0 .i15u4midbwkb orbit. Neglecting any frictimk4ila5..1dbk-cm1eb -y nwib ul 60ion effects, 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 p7ge,1qlh4-x gg0fizqg-c zn1rinciple.
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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 eoegldm 0 krh5ams,pxl(0/3 44n u,u :xlt5nucnergy?

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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 sgm zqy; ; :gp-tcz54bsdw18jf z-+i*d po *kouecond object with foub*z4g*p pko-+w:f ;jdq yo8zc m5i gzduts;1-r times the mass of the first if released 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 stretch 5.0 cm. I0 nzm*cs:pze zx+.age2qg( k:y 6c2 fbf another 0.200-kg mass is added to the spring, the potential energy*6.ec s g0yf+za:gkq2(exm cz 2 n:zpb 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 systl f 8idom 1abl:6yy5f*em

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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. a7n)w:v (vu:5z19l pvxgst hkCompare its kinetic energy K, to its potential energy U.ul p(g7 n ) kwahszxvvt591:v:

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car driving up a hillf(57c6 o a qhyd.9ftqx.

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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 obje58 iuf7+,5xr/bzlyrsseck/3y 8 sjs qct are sliding with equal speeds along a level frictionless surface. They both slide up the sar/y/ 3bx58+usfijk7zsyq 5r,s8se l c me 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 ad cii5u/ d/qs8 7qfcd6qcvo:3d+ q4h$m_{1}$ 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 forzl ie2b1qve3 up--1 wsces.e2i-zqp 1 sv -u3bwe1l
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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 presen 4 q*zf.6(ap porg/ibtt), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy pg(4p/q otz*.6rf bia(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 energy. Do not ignan.zz ( nmgumocgd(e1, 5b.* sore air resis5( uga d,m.(csz1*nebom.g nztance. 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 lo 7 nwh(f nhq(4qrcx(c*ses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetf(nxhr4 q wch*q7((cn ic 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 e6qw. e ;fns95,vd yj6ezlmu*7mqff +nnergy.
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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 isj ,(:6y9b:p ymlbi vlq

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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 c r7noxu*q 8ri,b-ny k*6f r,jrp5 )ayin 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 i toww/:gv8 r1vnq:8qm s not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times the work in one-third theydnk.1s14 ogish )nj6+gwcy 9 time. To do so, your power outw)iskyc.g1 on1h6+gjs dn49 yput 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 acceler kvb63btnsod z 5t:k7dt0ed)0u;*qiwls gm (;ation, the car'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 vertically 2.0 mkupsownbopw6rmm. j*cox 7+8 2k*4 o9 and held there. If the object weighs 90 N, how much work was done imjpoc7 swpm*xn86u. ok4w92o+* korb n 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 ouare:nc )bv81f 1.0 m, at a constant velocity of 0.50 m/s. What is the work 1)a8v rb:cenu 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 khrf9q :*4vzx/2fxlqj oh),vconstant force of 5500 N for a distance of 50.0 m. What is the w f, x hklxq4:)jzrf2 9h/o*qvvork done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 r,ogs /v*;lym2nm 70sdudv2- vj)qoaN for a distance of 50.0 m. What is the work done by the weight of the elevmu)2ydn2o* svdo gl0 va,v7msqj -/r ;ator?

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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 no8qh 4+q,msn fel-hdd z+0,na constant force of 5500 N for a distance of 50.0 m. What is the net woeflh,-qz8 nd,q4on+ mhdn 0s+rk 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 a g6* ysinlgxgc522ml6 long 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 fru.xel7zcgw cso4:; mf+wp z :6uit slides 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 sled on an icy surface (assume no hh+ .*6lwz* qei: lg4 5uosnmefriction), with a force of 60.0 N a uhew4isqo* zgn 5:*l6.+ hlemt 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 direction of tu:di2sv fsi1y9sz y :r3;o 5i:myfo0s ;dw3zz he force. The graph in Fig. 6-1 shows the force versus the ow dis: s2s3mvr;3fsiz90zy1ifuyo5 yd:;o:z bject'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 ofbuvsv;q1+g 7z the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when 7;q sbgv u+z1vthe 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 in F0q k1(qr1-kl9c 2 htrf nhzu4yig. 6-1 shows the force versus the object's position. Find the work done when the objey 1z 4r20qkf9(chrtnlq1 uk- hct 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 Fig. 6 b670bintx , -eqqgdj2-1 shows the force versus the object's position. Find-q,b062 itex7dn qbjg 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 applx) oh *ty*nv/dn7xap5z *: helied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the 7lyv*h:hx)e* t*5n dop azx /ncart?

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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 move a 55-kg cart (icv;5+si 4uh up;bf,kz nitially at rest) across a 10 m level surface. What is the final ufu;zp54s v+kcib;h, 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 u()km)s:g ag 5 f1ybgcmuch work is required to st yu:g))f1(gsab5k gm cop 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 5e 1pd, x n0o4vcd6vqp sc+1zoinitially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditpcno,1pdxe+scv5zovq1 406 d ion?

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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 0q46wj ftk0pf-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed 4f6j w0 ktpf0qwill 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 horizontalj8e4j:y r ntc; component of 80 N and 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;:cj8 4eynjrt 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 balecdru6 nd5lxe.3 -,b bx0vkis8(br -or of hay, striking the hay with a velocity of 60 m/s. It pene run 6r(8 rvobsdx,50 bb.x-3el ik-dctrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m al-q92b xe /umi(opz4)xs w4-l /ywqknbove a floor to a height of 13.0 m above the floor. What is the change in gravitational potentiaz( kq iy o/ 4nxw29lp/-xs -ew4lm)bqul 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 pznwem* jb 8tdn7l )at;) zy;;hlane is 4.0 m long and rises 2.0 m. If tya 7l) hwjb d;*nztme8 n;)z;the plane 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 3:wgz:dra+-zkh4htcmsf xa t, 2ad+ ) 2.0 cm. What is the fz ht, rg 4wdx:3+at2ascmad) z:-h+k spring 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 character,zinuq cy09 k hjiy.h .vb7 xql/q:,4dized by a spring constant of 60 N/m. How much potential energy does it store, when strey 0cji/7 nuqqh.y xd:z 4,kv.qi,bh l9tched 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 springm(jk*c 7 u 8 z+1(;1zqxvvniuzh) efkf with a spring constant of 25 fx iq c8)uz1zumjfk(e+;n(1 z*v7k hv 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 consle5:v,4jx0pzv b ysud ,ph(sn7d-ed / tant 40 N/m from x = 0.20 m to 0. dp-,b snuv:(v h7s/,j 0pd5y e4lezxd25 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 initia ksifr66 jmwxyo)7b8 )g 5-wvq-:ie cqlly compressed by 3.0 cm. How much workrsec5g8q)xq)vy fj6m6 : biok-i7ww - is required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope. What isk/3a5jwew rb7cu5fe uv0 hb* 5 the speed of the slier on reaching the bottom of the slope? (Neglect fric er* jbw/7ehkfuwu50v 3c55 bation.)

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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 iniokoyz4l:w b uxi2;0 s.tial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevat2kl o o;:b0 z.wsi4yxuion?

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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 botr6n0 fy .i+vsstom, it has a speed of 9.80 m/s. What is the vy6 i+f.0nsrs 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 abovqbg.o yuml hp9pq un39o*r7b7t .z n),e the floor, its potential energy exactly equals its kinetic energy. How fas 7u.b3n n,.9)7m*prz t9qhgoy boqlupt 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 level with a kineaq3t u*gd v-: dld3x-dvspr;7 tic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical :lva37dqd*pdr s- ;3vgu x-dtheight 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 leak cvl 2u5y40fm6 z9y y8*ertnrves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kir z*vytr8 cyl4ykn5u629mfe 0netic 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 h *e..zw5 ib6yvtaab; from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slopz avaw.*y t6b.beih;5 e, 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 sp7ji;o 2+r5 lm xpz- dfnml cy7o43o(xieed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglei4-(op 5lynl;3dj mmx+fio727 xozcr ct 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 dy,qj5s4qeu r,qo2) 2kjail * ayx w0k0ip 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 the next j0q5,,qaar 2q2s* kol4juxewk0y)yislope, 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 ( z6s1c5mnz 0gcpoint

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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 h(4i nmy*/* o stf4xv0h9xwcvl/ ay-q30 cm away from the vertical axis and released from rest. What will be its speed at th4v/xs*m q y*yntx4flw- v/hho0 a9i(ce 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 uncompreg*(bdyaklhd 5 i*w af8n/p( .yssed horizontal spring with spr(*a(pi 5hd/gl bykdfay* 8nw.ing 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 2l cvy3)z 4y :x q*-z9cvd7umcb2 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction foru bv49qc:zdc-lc)zyv3xy*m7 ce 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 hor;65e adh u uswiqp-f+8izontal surface is 50.0 N. If the initial sp6pe iu a8h5ud -+sf;qweed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surp:mlq-y ba ,:tface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How , m-t:bap:q ylfar 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 c6pn9gme;sn hn25dh0 y to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface h0 hdg9m2nesnc5 p 6n;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 .d;lrj7qz9jook0 *er mjvd1( rhud50 top of a 50-m high slope. If the work done by friction is *07lv ojm;dh10 roz5j9j.erddu kq(r $-6.0 \times 10^{3} \; J$, 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 long8 q7 zdcgu: mvgoy.lr4t4ugn8 9gb.7l and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the bod4.uz7 t.gr lv8c84g9:oq gmn yglb7ux?

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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 - :((mmr2c i c75ok 7ihqjxyc1 4oocektop of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the (rm eoi4c:ix27mjcc5qkc1 kho7-y (oplane?

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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 wi42/tba/q ecdcfmy f8n; 3e pg+th atd4ff+yca ;2qgm//3ee8 cp bn velocity of 7.00 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 (bl9sc1fn ;m7 )skyheup a flight of stairs 10.0-s e)(khlbm1y s9;7c nfm 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 wi3s2ggf nl8u cn ax7clk3zt9-a e:,;cith a constant velocity of 5.0 m/s. What powerkuegzgaa,t ci9l :3c c78n;3 ls-2fn x 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 use-+coe0hvtx* sd by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wh *0-cx soe+vt)

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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 z8 (su2eryux -W while riding. How much force does her foot p28u( xsyz- ureush 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 accelera7,v 4h1dx,1xtkdyavvs-4ue k 6e og; gtes from 0 to 25 m/s in 7.0 s. What is the average power delivered by dhe4ge1okay-tv k67 vxx1v,us ;g4d,the engine? (1 hp = 746 W)

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