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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 wor/kxj7gxu*-.zw u o4aq k expressed in SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no mo+lwphma) 0 ou.tion?

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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 statiki5+)d mmu0(+qcgdd eonary brick wall, the amount of work you )cd( qdmgk0e+di +um 5do

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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 zj , d fdd*grdjyrl8a +ko3,-22.0 m vertically and is being held there. How much work is being done in h gd zd,fd2ad+j8* rkl3 j,ryo-olding 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 t e804 zdccfq3oyo;eohlj5(o7z1f v.velocity carrying a 10-N object, the amount of worccdjqy;zfov oz1oo7(8. e h t3l 540efk 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 vertically 3.0 m then returned to ayne5)f*n+p/p6ixymf g.q : fits original position. If the total weigmp:65yne*)i/fa .f+ yqxfn pght 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 sl/l 8(9zle; d5 nrjelon an object do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work go9-tyq7( /s f6j xzjxdone by gravity while the ball goes up with the sign of the work done by gravity while it goes d/xj-6q (z g97jxsofty own.

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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) grptar6 ub7:v 2eaph, representsetu7:a 2 vprb6

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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), wp car)bc *zxk5u6 +0pn i(fs7*mzwb7 ehat represents the work done by th7cb**iuxw p7(6kp)b0s+ r5 eznz camfe force F?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, thnn9 3uhz2: eoien 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 neg g;;bve*afxmc ; :jw8wative, 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 og :zcpgb qj 3rmtlml)aj86:*p/5 iikp-sw ,j2bject's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is movz*6zn)w99. b crvs- diwcozy :ing at twice the speed of the c.9y ) n*6biwzzc-w9 c dvzrso:ar. Which statement is true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car K. They9ce8co3s 0aje vb7dti0o 07ioprd1xgn .b2 / kinetic energy of car J, compared to 1erxa0 j32p n yi0dot/bsc 8g vc977d.beoi0 ocar 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 ita ioqc+a :7;f4pyp vw*s original speed. What is the ratio oi:; vca +4yqap o*fwp7f the final kinetic energy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s ad9 s apec4xtx( 02/kjnr(fw*a nd a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic *kwx/ xrdj at(fac p2(e04sn 9energy, 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 1.0-kg ma8/)wdk tb/ vru3*gwwt ss is moving 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 stoppiwr*wkt d ut38v/b/w )gng?

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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 o 5crth 1sqm.3e+yy3rvf 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 have skidded, under the samyyv rm+1e3.3hc rts5qe 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 orb7ug1i/ v yp3*aljh4ybits the Sun in an elliptical orbit. Neglecting any friction3hj* 1i7ypa4gb u/lyv 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-energyktk kv4ob 1t); 2pzxd: principle.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have negative po75jmvvgc 3athd.3m;a p9 y(kxtential 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 heighjt.pi srgh7 31xs 38but h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy p 7sgsxtiur831h3.j bof 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 atta; g0 7sj 6msm(li8bvo/ auung/i2ty7qdbqm - 9ched to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the 9q 672aynb- mvdmi/sqisbj7lm tuu ggo(;8/0spring, 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 +scov1y pgs+e(7a/d6 dj n 5fpenergy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, t0f5 yer g)7 myjc3d1yno its potential enernjm5rd0cg1)yyfy7 3 e gy 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 drivin+d53 ,0iiqfxz /3, irpyfb obfg 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 g/ejn sag)cljw/;*u5and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which r uw5ls/gej n;g*jc/)aises 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 m w: k-yxca 9habh776j.pxmd-$m_{1}$ 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 +h/i 1zcjh)y m o6.ppd,lr5f gforces.ph c)y.frg+1 zj,d l6 oi5hpm/
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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 prhu;1tm; fv(t pesent), to the ground below. How does the kinetic energy (K);v1ttmhu; (pf 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 kineticct*a (qf frncl0b:8:xync7 .c energy. Do not ignore air resistance. How much gravitational pot:ycxct:8.q7(rln fnccab0* fential 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 lose8kjvtq(m 1f dk g7.wk+s 30 J of gravitational potential energy. Do not i w1vtkf qk(7mkg.dj+8gnore air resistance. 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 enerb2 ld7htm.cy;3a zaf5gy.
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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 isx)7g oig2 t 9qjzbza9z287+hgwbn zz 5

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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 l8p x0/,wvlrjtr7b r 4in 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 pt0st pg 8k)mo3ower?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times the work in one-third the maoln),8 z vaeam,6ctwc+* u75+nte ttime. To do so, your power out6me z 7tl m*unw+at,aec5 +noctv),a8put 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,h:ncgbv. 1j8sjjrhno+9 :k)i 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/ 43xh pwajf-h0i /nbu 2.0 m and held there. If the object weighs 90 N, h- 4hu0p/iba /3 hwxnfjow much 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 physics book up in the air a distance b4xjew/q6 fw/ of 1.0 m, at a constant velocity of 0.50 m///xf6 qj4eww bs. 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 forceejutz.q 1 9f: i1iad3vrol2 /k of 5500 N for a distance of 50.0 m. What is the work done by the l/ejuq 2 v.iki:13frdaoz9 t15500 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 N for ;1 zw0aoiso 4ij;u x4vet: ai+a distance of 50.0 m. What is the work done by the weight oix4za;; e1aio+tj0 :ioswuv4 f 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 a)c m0dz;ma utx:5r rt+l0xu1c *jr2ppulled upward with a constant force of 5500 N for a distance of 50.0 m. What is thrzu :cjtr5 )pd21ru ma m00lt x+xa;*ce 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 k*mt. um 3uct7:uy1n /gmhv(m.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m down x:smmj /2yty; 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 s5ll+ vzbq,w-,s3nhtmurface (assume no friction), with a force of 60.0 N atz,,n q3bv5 tlm+l ws-h 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 62,lpu1l7z 5pshz ulcpe(*hc the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objepz5clz h pluh1(7, l*2u6pse cct 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 inmf2w8ptl- p 9t Fig. 6-1 shows the force versus the object's position. Find the work done when twlmpp2- tt8f 9he 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 gra:,f+z psl 2 xam j+v5zexe.jx(ph in Fig. 6-1 shows the force verxl2s+:f(,x 5ez a epx +vz.jmjsus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig.pgdf1 lg.0jw,)+jhm w 6-1 shows the force versus the object's position. Find the work do . p1+g,fdwjgwlm0 jh)ne 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 iw:) xzk lvp(q/+uke+5/ow, globkj(m s applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the fiw,e:+om(o /w kkg/+ xp jv zqb(kl)ul5nal 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 to3a 1;e8 gaf ga78ouswp move a 55-kg cart (initially at rest) acra p e7g31fa8w;8ugsoa oss a 10 m level 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 movincb 7op fydgweeup/5j.5/+ n0a g with a speed of 5.0 m/s. How much work is required to stop 7db + jno/ye cp5g0wf./pua5 ethe 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 initiq/s(0iygn dl86 f mdf)i5/fmhally moving at 25 m/s, what distance is required to stop a cafshy 6d dfn/g0qmm8i( l5/f) ir 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 by egxmobl 3xr-i. rk /yv,b8/*zc xerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, ass/ 8cxio. bz-y/3kg b,lxr*vr muming 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 0+l5 fh9 pkjdma vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. Tk+5pdh09 lmj fhe 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 fi s gazcg80xp5/-ti7f42mrc shot horizontally 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 5 ti40a/p ifg -2rxmcc gsf78zstopping 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 above a floorh6ik-y di 8m3v to a height of 13.0 m above the floor. What is tdmiyh8 i3v-6 khe 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 is 4.0 m long kbg9*7x5p du+4i90vcsx *dspigtot 7 and rises 2.0 m. If the plane is frictionless, how much work was done by the pt i+7v* pi7co4pgdxb9s*s kg u 059xtdush?

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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 pon+uoyq3g s u2yhc(7* ed5c2to stretch 2.0 cm. What is the spring cq5+ g7c3cu dse2 u*(noo pyhy2onstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characted(i lp9vml*.m rized by a spring constant of 60 N/m. How much potential energy does itmmivl9pl(* d. store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compz2t 6n61war6oi stm g 7 :o6x;j:rdjmjress an initially uncompressed spring with a spring constant of 25 N/m by 10d66j tmm: jj zoixa6ortg;s26nr7w: 1 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 sp+ )f;dxbz31c6ryxv wg 5mril(ring of spring constant 40 N/m from x = 0.23vx w6(+)gf1irz lmbr;y cx d50 m to 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 spriu3x zx grc)9 -(zi0/*o,5pokx mqhpxhng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to co35xrxhg /(o)i0zm c,- 9h kupxo*zpx qmpress 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 mo1w-v fz9 bx;m*4f3tug p s;zej8*ltslope. What is the speed of the slier on reaching the botto fupg 81z mtoj;-4w elzb9mvstx** 3f;m of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial speed i u8ob c )gk,e 00dkr(df7x6tkof 4.0 m/s. Neglecting frictiongr0()ecokd d8fi7ub0,6xkt k, 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 inclined plane. A).t 7wug9gf yh i6l)vkt the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plg))7k. y uivtgw9f6 lhane?

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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 itq -7 x9z8xzao8j i4b-dsxvec9 is 0.70 m above the floor, its potential energy exactlyb9 dc9 jxv8 zqza7s8xe-x4oi- equals its 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, weighing 10 N, blasts ,b,- 3zo+ eb7osuole7anjg: n straight up from ground level with a kinetic energy of 40 J. At the exact tjo7nn -+7,e 3b zlbeog,su o:aop 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 p0wapohd bd.u( 3k9-wm leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, re pdwwdb-po39 ah.0(kulative 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 poinzqb;ce+ c6mpdiv34 md + w xh9e3tkg1*0z; fsmt 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, g3 *0e+skbqz4;wcxmt;hp + dm6z3m fcdv9e1iwhat will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m abovefs.j4m i*f id8 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 above the i. 4s8j*mdfif 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 starb+ 6m:qspuix5ts at a point 30 m above the 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 the next slope, which is 45 m above the bottom of the dpbs uq xim:5+6ip?


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78#
 
  What is the minimum speed of the ball at the bottom of its swing (pop(vm5 v, s8pd rauct) ;u0/cxpint

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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 cmhc1eap3c kr6: away from the vertical axis and released from rest. What willec1c3 h k:pra6 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 uncompressed horizontal sm(hrebbht:wbo*l+ m mq.ae *ro 15.t,pring with mr.oa.1q lho(**eet5b bbtw+ r:m,mh spring 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 22 m/s, slows down her 2000 kg car 1qhid43::k ho:nwe axto stop for a red light. What work is done by the friction force against the wheels h :od:h3 exkiawq1:4n?

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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 objcibq my4+e)*7x3z4 f/ jgwjwj0 pktl3ect and a horizontal surface is 50.0 N. If the initial spb3wqzi x cf47/3k+4j0j* p mw tjelg)yeed 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,ry6dqeq9v)a zk +yk/(r l)sz 6 level surface. It has 24 J of kinetic energy. The friction force on ia /rl9ze 6)rzykdq )yks6 v(+qt 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 horizontally to a xe)66+gzr m ug2.0-kg mass 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 ch)6e 6xugzgm r+ange 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 frome7e*fd:c av kfy,n t m/):x4gt the top of a 50-m high slope. If the work done by friction i:a:eyemd/kg, x7 cn)t4f* tfvs $-6.0 \times 10^{3} \; J$, 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 pl b,mz5abs0c i:ruic ):ane. The plane is 4.0 m long and rises 2.0)s0:5mic :b,c zbauir 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 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 abovegiu agt(vm;f qw0b280 horizontal. The coefficient of kinetic friction between the mv08bgmu2fw iq;t(0g aass 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 strikes the groun;s . cenij./iod with a velocity of 7.00 m/s. What average force of air friction acts on it as i/i soi.jcn.;e t 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 flight of stairs9 )bpd, gb;vba 10.0-m highbadb,g9)p; bv , 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 5.0 c(s(rq d(d r65aay9t(i g ece9m/s. What po rc5y dae9 6s(g(qc9dt(i(e rawer 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 *ab, r,p,z t4;vrj1px(l bx:xa e5liuhp motor that runs for 1.0 hr? (1 hp = 746 r,j x1;x4*irub : l az5ev(bpaxl,t p,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 much force d +x,vmun9e/8 pw1 ivy;zmzqo5 oes her foo,8mpwo;1 /+ize umv5xqnz9v y t 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 accelerates from 0 to 25 m/s iavo 7q;ixj o-;n 7.0 s. What is the average power delivered by the engine? (1 hp x;7oiv ;qaj- o= 746 W)

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