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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 qa e xs7zfbkxepi-4l2v a7m0s82g 4z 3in 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 syst34n l*-iex6lyao 5si0 rluu2n em 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 stationhzi, b oa:; jagihkr0 z;69w,yary brick wall, the amount of work you;az6gih9, ar:zwk0ij b o;y h, 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 lifted 2.0 m vertically and i(c-zt/micil.kn3utq9c g* ( is being held there. How much work is being done in holding the/l3qgi-(tuiz(*cc nt c m9 k.i 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 horizontalt92e c+.xqnj ,+*qppm in oy6vly forward at a constant velocity carrying a 10-N object, the amount of*+, ijop2ytnen6.+ qcmvp9 xq 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 lij ;y,f7.liysf 4+j*ann uaak: fted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how ji:,afnuy4 a+ j7 k.nsf* ;aylmuch 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 fornfw,bpm2.fxp:(vwq ,f 2y*o k;(vjh rce 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 sign of the work done by gravity whicsmjfq6554 *m :iybvule the ball goes up with the sign of the work done by cu5i*qf5mm ysjvb4: 6 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 position (F vs. x) graph, represent3 xw(p5;bn itvsw3tnv 5i(; bxp

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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 represjl,rsb3 k3c w 2h6 uglh+ebl,3a7il5qents the work done by tlqwaglslr, 3,il+2u b5 j6hekh3b3 7che 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 positi vl4*gs)4hs: nfu yjk0g+)gqxve, 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 negat p e1vs.p 9;ipqk-yvv6ive, 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 anbo5b:5z nujm: object 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 much as +dci1 p irq+ m6t8:o8n u,cklya car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car86ptc8nyil m,c1:qk i u+od+r?

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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 w.bzb p 9-aawurm3. kno325a7rgrc0g has half the mass of car K. The kinetic energy of car g zba9w.m 3cra.5rw2aknur-g3 b7p0 o J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. Whan0;dvjlh6 e;p w2i u(yt is the ratio of the final kh06 y(; u;l 2wjvpneidinetic 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 pebble is moving almbyi g92qt dtj.*)t lpv.5e5lw6xo6t a speed of 5 m/s. If both objects have the same kinetic energy, what is theidyot9l6lvjm.tlq5 6x 2etbp.5 ) gw* 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 h 6/gbujs q9duoua1 ,:1.0-kg mass is moving with speed 4.0bquj o:1u, u/sd69agh m/s. Both objects encounter 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 car in a panic, and skid a certain distance on rx8p me03s+t va straight, level road. If you had been traveling twice as evxr0 mps8+3t 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 orbit. Negp;4 )j;i rqpoc8)mjd nlecting any friction effects, what happens t8 o)jm4dpj nr)ci;qp; o 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 princi:. 4bn 0pyhn vf0 pgtjzeo)4il q-,4tjple.
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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 e:q jx j 1ffh9z+maxg9tg01 u7c ao1y:vnergy?

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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 :/-at ragzc67fct db8 above the ground. A second object with four times the mass of7r 6azbd-t :cag/ ctf8 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 ofr1nl7k-*y. b4f5w( 1azj fuubheulx7 qo: 8 hn a spring causes it to stretch 5.0 cm. If another 0.200-kg mass yoh-*1jlu aqlb8w 5 k.bn f7xuzunh7r( 4: e1fis added to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy of02o;gl.sw :xzq)zuom 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.f/ + r 3lm22wwxpjl)cd Compare its kinetic energy K, to its potential energy U.3w2)w lx 2c/fm+ lpjdr

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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 hpb6urat +l2l jzwc-d.wz( /a(ill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object andd-gzj7j g :sd3e l/yf; a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which ri e;jg7lfy3-djs z/d:gses 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 rm jldze( -:x+faqe 8*$m_{1}$ 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 fret t (1:suy/nor conservative forces1:eu/ys ntr(t.
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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 buildisb k6vydn/2b 0bvix 9q5qez5,ng, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of thn,dqb/ivqkb2 zeb5s 0 9 y56vxe 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 3 gpq,so fw3)+ycq7aj4q)4j yb 0 J of kinetic energy. Do not ignore air resif)jb,w+4aq4 ygo)q 7 jqys3c pstance. 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 distanqw5uy v.5x 9 3(pjnw lk(fv;hnce and loses 30 J of gravitational potential energy. Do not vj w y5q3xfhp.w vln5kun(;9 (ignore 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 const 8d7 qlngyn kx;)k/+eervation 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 is1y:lj,1h,sr/g ,o ks/kuau ib

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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 express q4er sfx.4tm* v e( b3iuw*da,rghl;8ed 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 un::;jm6uyah8*zhx2 9 azx svdv it 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 dw nqc.4i5(wmnqj(i v 0l mtv*9id 3 times the work in one-third the time. To do so, your power output must have bev4(*wm (c0ilmqj9 5vni.q wtnen

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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 wmowg,pa(ejo87c 3 8cu+ +byvpd; h9za constant acceleration, 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 m and held there. I)0 d,rd bev)9rgp. bw.0snrg +p,yszvf the object weighs 90 N, how much work was +0r rpy))g.bvn,g w0pbded vs.,s 9rzdone 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 of 1.0 m, at a constaptyry *0kzn4l;:3wc n 7itpt8nt velocity of 0.50 m/s. What is the work done by the weigy:3 c;nyt7p l4r n*ti0wpkt8z ht 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 p/y 7rn;2 2f-p3uo :ycd9r c 2.jzoxrmutqjy e8ulled upward with a constant force of 5500 N for a distance of 50.0 m. What is t2uy;n2urqez/2r3 oyptm fo j c:xj.-dry 79c8he work 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 N 4ze6vjna z13j)w5qjhfor a distance of 50.0 m. What is the work done by the weight3z)ne wvj 4j6 ahz51jq 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 ud k(4jn7msj7fpward with a constant force of 5500 N for a distance of 50.0 m. What is then77kfdmj(j 4s 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 alondc76m:jwn2 jzn h7w9ag 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 frui6j9l4xvi*tka. pzx,k,d .qan t 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 f9py-5qny w u7yriction), with a force of 60.0 N at an angle of ypy w y75-9nqu$37^{\circ}$ 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 objec*azw 1jh+l3fc t in 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 object mo j 1c*fhw3+lzaves 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 objeciu2ree4 b 4 wp7u63k;fp3qtqit in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's pk6uerf27 ipb3 ;3iqtup4wq4eosition. 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 f foyayt 478x*the force. The graph in Fig. 6-1 shoy* 7x8 fyfao4tws the force versus 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 ov ot:;1rrb* nhf r2p6c01ajk kf the force. The graph in Fig. 6-1 shows the force versus the object'sh121 vfr6rab k pj*o; r0ckn:t 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 a 55-kg cart (initially at rest . 77rra2ujlguuhbf4hj2z/ k 1) across a 10 m level surface. Whatb urhl/7r2jzjhk.4 u 7 g2afu1 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 is4k1 .pvi gm5g,yqy q(d applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed dk g(y5.yp,mg1qv4qi 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/sh 0e7hjhg4g -6 twfih6wh9u. x. How much work is required to stop theh uehgt7w hh46 .x9gw-f6 h0ij 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 stg( bw16)ec3 nvr) ttdkm, :rpkop a car initially moving at 25 m/s, what distance is required to stop a cakb1 n)g6 r te(kcpmw:rd,3tv)r 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 exertink 6.3j0jsga6j 7 tjdwng a force of 20 N over a distance of 5.0 cmsw3gjd t0jjn.j676ak. With what speed will 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 horizontasu f1ct+ 4- afnu77gwr*+ jvuol 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 moves 2.0 m horizn *7f w oru7t-ugfjvc+4u+s a1ontally 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 stn/ez) /ovy/ jhot 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 stopping force acting on /vjy/tn/ e)z othe 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 abo s7mi:u ,5vf4hgsxkb3jj4,y xve a floor to a height of 13.0 m above the floor. What is the ch3j,v4 bi g7s,4sxh jxmy: ukf5ange 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 q7d8ul ;8n mm-q (4 aq1ofiocsf7 wc3i xc+j.d4.0 m long and rises 2.0 m. If the plane is fcwdf78o+ m.jq 74-oca8ix m( qc1ul;qdn3sifrictionless, 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 theb8(6mi )cxboi spring to stretch 2.0 cm. What is the spring constanx6bmbii co( 8)t?

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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 much poqb,p sne8+rkb a 5e.k1tential energy b.q81eknk ap e+r,s b5does it 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 require c 1d7crej;;,5lkpif*ig8j psd to compress an initially uncompressed spring with a spring constant of pcc jp 8gk ;r,1j7lf;e5i*dsi 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 sjpo g w+ 3h0gjj0.x-lhe;qq5of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x +oew -hxlqsqj0 0g53gj;p .jh= 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. H(y7)u 8k fwxsecyw iu 4(d84zvo7(8ivey(zyxduf 4 )wu8kc ws4 w much work 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 s9x shnm1+dp7xcv6 0xalope. What is the speed of the slier on reachi +ahx9 ndx0s c1x7pm6vng 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 kg, pushes off the top of a hill with an initial speed of m g 9 xn8(djhk9ct0x+y4.0 m/s. Neglecting friction, howd t8 xjy0 hgmn9x+9ck( 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. At trxk/-gtcyxd a k h19wqoc* 156he bottom, it has a speed of 9.80/co1-g5 1arh k9 xyckqt*xw d6 m/s. What is the vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the flwgsks,cx 7r+hm1s -1joor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic enegrx-hs1sk m,c+js17w rgy. 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 straight up from gava-w p 509xbmround level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 1wa5x bva0m-p 940 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 leavew6wyj0uu+ h4d p0r mr3s the ground with a kinetic energy of 220 J. At the highest point in it m6 y+ww3uj r0pru04dhs 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, )eoby. kurl) above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top yrke)o .,bul) 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 poi1 hoqn6s9n0b /0vtdaunt 45 m above the bottom of a dip (Se 6ou/qs9d0banvt1h n0e 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 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 dip with a z52dnr+y ykv)tp oo**nkr *p2speed of 25 m/s (See Fig. r*+ypk2yp 2rn)*nkt5dv ooz* 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 dip?


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78#
 
  What is the minimum speed of the ball at the botq . c8luzbcb1+c**+dt c4ljernyqd 2 7tom 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 cmkoz,yj 1i+s4 3 ns6izv away from the vertical axis and released from rest. Wh4synk,6zzvi i13+ j soat 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 inizxa-/ hs* t: 0psge /)yyk)vwatially uncompressed horizontal spring with spring0-gesay/*w s)/) xt zy vp:kah 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 2ie .ygw* -6z7hntkn/ f2 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against h6.n*gizk-7t/fenyw 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 forcyr w bf6,y87aue between a 60.0-kg object and a horizontal surface is 50.0 Nrwu7y,b8f y 6a. If the initial speed 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 gp h6,ze zea5 2a;ku/isurface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. H;gh2eu 6kp,i aezz5/a ow 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 horizoimkql. -u;rp9ntally 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 milqum 9kp; .-rass 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 (z u9z evrd 7x 5w3:lj da3(ve+-ztkiaof a 50-m high slope. If the work done by fri+3 azz7d(wxrji :(tv3dee-l uz a vk95ction 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 vtl2 hjyf*3nemj+dx 37.a1nk 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 plane. What was the magnitude of t*vnnxtm7 ae21 jjk.3l+fd h3yhe 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 f a:3frper2a: xrom rest at the top 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 p 3 rxapra:2:eflane?

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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)ux3z:t a. ac 5wwx5q89 uzbzj from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s.5.ztaz:xx3w u a98cbzujwq)5 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 flight of s/17 q yzlre,c2uuvg;hud;vs 5 tairs 10.0-m highy 2lq1 ;5d/gv,cvr eu7uu s;zh, 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 2zjx 6ype*pmfu14 5bk5.0 m/s. What power musbm5xy*6j24u z k e1ppft 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 motor that runs for 1.0 hr? (1t*n9 5 zm)q xxyhf:w8eu5m k5e hpuxqt fem*hx5)ke:8m5yz 9w 5n = 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 50h4qc/9iai /nj exg w87qyke8 +0 W while riding. How much force does her foot push with when she is traveling at9ik/+ h/gq e i7xac84qynj8we 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 :k9apha:jy7a syk9s6 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 74a ::pysayk6ks a7j99h 6 W)

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