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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test60.html  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。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  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 S mwx0ilz/f inh96,+ jqI 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 zlvw;keoc2* )kbv26s 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 c0 lc1*tl azw :41 hpi,(qzszxwall, the amount of work you do c i(z*z4, zhqwps1l0 cax1lt:

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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 is being held thei7pg :* uq9pgy5mu3avre. How much work is being done in holding the box iy7 * av: 5puq9gpigu3mn 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 vln0/vrzu4 jr4 elocity carrying a 10-N object, the amount of work you d40/rlnvzj 4 ruo 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 its h2e nu-7 d.vxv 30xfbmmqba9)original positx0n239a vvh-duq m7e x bfmb).ion. If the total weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an object do work o4d4 (bfna:av)*toc w4ms c,h7:wbyjrn 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 ofe(rcshbva.fa8r4k - /2kh;x9wth8e h the work done by gravity while the ball goes up with k rfhh2ceksv tb4er-wh8.8;9ax h /a(the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Forceqq0 nr(c.c0pu versus position (F vs. x) graph, represents(quq .pr 0c0cn

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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),jhpnzzv s-5(: what represents the work done by the force F?(:p v-h 5jnzzs

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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 ogx:5pav9.l/rxwa 0wqx 9muy-vq 0ur5 bject's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then the oob0kzmjtpz n+8jf2uh+:o2 4 hbject'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 ang) lf*t-5b mm *n fedpaye,;gu3y6ea7 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 muc2n6 7 1he1opy7u+ ufpq*y+ws6e7/het eqkyt kh as a car, and is moving at twice the speed of the car. Which statement is true about the 7oqh6+1te2w /yqfep7u6*ke1 hypk nytu e7s+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. The kk)-zla6/s 9y5nn hkdjinetic energy of car J, compared to car K y k)ls5/nkh6a jdzn-9 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 an mq aq8u,n0p 5 yv-tru2rtgt/5d bounces back with half of its original speed. What is the ratio of the final kinetic/,mntt-arp qt2q5u5yrg 0 8vu 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/sg(aiobc,;zm * ,mpe,s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to ,i,sop cezm ,b*;gm(a 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 spec3 4sn.kwl mq1 ty wu97wraa.*ed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter n 3.kw* 1qlwamctyw749 asu.r 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 distn/hwpct 4i4/ nance on a straight, level road. If you had been traveling twice as fast, what distance would the /nc wh /p4tni4car 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 a()-d;gq s4zrf bwkn 3rn elliptical orbit. Neglecting any friction effects, what happens to tbwrkrn);f -d4 g(z3qs he 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 prix8r:o bvqc-ek7mv9k 8 pju 2kf9bqa:.nciple.
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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 /ds2khn5v ytvu6g:.;nu fkp -energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the grounm gz*q0 llws:nng;;0fd. A second object with foum0l;lzgg f*s n;:wq n0r 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 spri b-cqe*;nstty bl4u-k.d09t fecl .6j ng causes it to stretch 5.0 cm. If another 0.200-kg m l qnes0eb.d-t* f4; jc.- 9ckbt6tluyass is 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 eu6m8 0qyfztutat4a(gol)y20p3p zc2nergy 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 e4b.fzbmx2h1 - rrk ;vy38qnacnergy K, to its potential energmv1f ra 3rnyx2.zckbq -b ;4h8y 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 driv m*zrif1ef , )m1oubf,ing up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding wip 5fm./ kq.bzmmj:.bath equal speeds along a level frictionless surface. They both slide up them :az.f p..m/bmkb qj5 same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses rzq6(iag -0qsui 8l2gk ak /m1$m_{1}$ 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 forcew /u8 cq0c gxuu/38ywgsugw w8q/u0ccx/ yg 8u3.
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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 presej7c;onhk;a,w4hu gf / so 97kint), 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 the building? f/h9 7;oo7i n;4ua kwhk,sjgc

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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 en.m vicinni; o,;mv5 f6s5wq. iergy. Do not ignore air resistance. How much gravitational potential energy did the bciv.;io s m.v55nqm6f,wn;i i all 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 loseskqj,6ghgk4 c 7 30 J of gravitational potential energy. Do not ignore air resistance. k,7jqk4 6hgcg 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 conserju-k z9e8p: bivation 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 is9ri5 / x8moy9rte2r yhv(ry4g

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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 uni(j icw+my-9m8oy4r6 o gyohkb/k f z9)t 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 power?z(3/g b j -.5typixpi;jawdr6

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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 onwkssd0j07 y ,tpy y-4ke-third the time. To do so,skk y -0jdwy04sp ,7ty your power output 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 accelerationau g9ub))ov8n6mhmf)9 cd/p m, 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. If the object weighs )ywrvsip)w*iu;3y +wu3 x ;o,gba4 8 a r.kriq90 N, h,;riwyai.rwy) o)3u+kpx w q4ub vi8r; 3* sgaow 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 air9pg3as ssschdnnb2f 45t:4u:y8,q es a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done byd se bc 3a sqnus24f,s4hp:8tsn:5g9y 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 with40 :bmuy33 yel5kf h5c0uf qfn a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N fcuy4 fuqfh3nm 0y50kl f3e:5borce?

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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 f jalt 4q:.mkrvw1y/, jemhs0ij03x - oorce of 5500 N for a distance of 50.0 m. What is the work done by the weight or t q/0ah0-ij.vkmmxj,jeow3lys41: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 pulled upward with a consgo9ejw/5xrgx f x)62 i2sy,2 a k.vbvrtant force of 5500 N for a distance of 50.0 m. What is the net work done on the e2 6a bjvv rksy/xwi 5og29,.f) g2xrxelevator?

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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. bgmzin4+r +1+w . s.mqyfz-)c+rvwtp0 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 a ramp,9iq22 oku,tx* ncqrlio t3;epn a-9; x p)trc+ 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 sistelmsx 2o7apl6) r Sarah in a sled on an icy surface (assume no fricsl 76m p2a)xlotion), with a force of 60.0 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 in the direction of the force. The graph in Fig.m8 *hs2 ,iau2y) v+svzvza)qf 6-1 shows the force versus the object's position. Find the work done when the v8 ia),m fsyzuqs)v+ h22va z*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 200 8(sidxfu)ii n 7;7rnrcqnbzk y d;direction of the force. The graph in Fig. 6-1 shows the force versus 7(x bi0 fk;duz 7 2dqy08;)ncsirrinn the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fd;gy c;y*;1tpz8b1ov m v2ezbig. 6-1 shows the force versus the object's position. Find the work done whz;;;o1g vy*ycde1t2b bvmpz 8en 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 forquvh/z80p 7js-vfur 7ce. The graph in Fig. 6-1 shows the force versus the object's position. Finds uz/-ju0h v7pf7rvq 8 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 j4/ :*4jk pk 8n bi:lduejre-2/hfnekapplied to move a 55-kg cart (initially at rest) across a 10 m level su-jepd2k/:4ul erk4bjifh ej*k/n8n : rface. 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 w6 pcy)yx roda s,8f1(applied to move a 55-kg cart (initially at rest) across ao (pysx)ca8ryw6, f1 d 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 moving with a speed of 5.08n/cwyb uf z. kifd +xv;m9/u9 m/s. How much work is required to stop thu;9b8zfvf/i.nc udy 9kwx/+me 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 initially movingazd+lt7 f;uo5 hf() )jy,ry bi at 25 m/s, what distance is required to stop a car moving at 50 m/s under the samez;ajb7 f u lo,5y)id(+yrf)th 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 exerting a7t)sizf/4kn a force of 20 N oz fak)/itn7 4sver a distance of 5.0 cm. 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 horizontal component of 80 N and a vertical component of iufg0 : ny(*lznh4a e260 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 the cart's final kinetic 4ni: f2z yunle g*0(haenergy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of hay, strik*p +e,v +oldw1ycq1lting the hay with a velocity of 60 m/s. It 1pd1 v,oqct l*wey++ lpenetrates 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 above a f+dnts vk43( hhloor to a height of 13.0 m above the floor. What is the change(4kntvhs+ 3 hd 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 an5bw2fd5kpn2q/nkm s *d rises 2.0 k5dqk2bnms2 n*fw/p5 m. If 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 2.0 cm. What isyz7zd ntu(h;8 the spri8d(zy n;u7zht ng 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 much,k* wnkov+n4no t)c t 12hl1ut3y)jsk potential energy does it store, when stretc ) l1h)u1k2ojnnsk3tot4 ntvkwy+*,c hed 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 sp9xy un*vilfdx at ,z5 27ov1+qring with a spring constant of 25 N/mdi*qyvtxz, 1 u vn2f+xl5a7o 9 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 requiredk+ vn2.iqjoxurt5/ bj4pn2hey +j o2; to stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)y n /n2j5koxh 2++br. eipq j;v4t2jou

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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 spri1+qfjl-dqxv t k:6;t-s0p.ps8 gan gung constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring anq0gft:-6t pv-k xgs+a;j s .p1nld8uq 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 f5un0ed/ozx5 ;t g- oarest from the top of a 50-m high slope. What is the speed of the slier on reacx;oao tzg fu55-e0/d nhing 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 wi gj)rntuefc*j .3u,y.th an initial speed of 4.0 m/s. Neglecting friction, how f.u3cj. j*uretyf), gnast 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 the bottomt.m(ejg3+b xo, it has a speed ofem+(og 3t.b xj 9.80 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 floor. When it is 0.70 m above the flo/w+vu( mhu1m zrb). kzor, its potential energy exactly equals its kinetic energy. How fast is it mu k(bu+z1zwr.v) h/mmoving?

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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 straifs 3s g.ijra x,.q:hf8oc9l ci2 0uvp*ght up from ground level with a kinetic energy of 40 J. At the exach9 p .0 ijs s38ovfi,*c crulq:x.a2gft top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic )tu+ccmv m42zenergy of 220 J. At the highest point in its trajectory, its kinetic energy itmccz)+mu 2v 4s 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 po1rw+ zq80gy bl/ r)wcjint 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 slope, which is 30 m abovwqj+lrgb 8z) 0wr1 c/ye 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 j2z gw g7)fp75ym)i yzug 6+bzat a point 45 m above the bottom of a dipg+zjg6m2 z5gy7)i)7 zwu f byp (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 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 botto z,6 h(vo,r.ny h2bhxom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will v ,( h2r.x6o yhzohnb,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 bottom of its swing (pr. t l +w),2z8t1c9js7ymm9mywsxp daoint

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from the verticawc6 j9,qoq it2vtbd:6l axis and released from rest. Whatqdw9cvqt6 i, o b6j2t: 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 hit toi 9jyti57o4ota1 6ws an initially uncompressed horizontal spring with spri to9 ito 51ioj4ytw76ang 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 200pv a vsq2bkfo0 mrq)lj*g7j2nqc:9 (20 kg car to stop for a red light. Wha*0c7nb29(pjq )2so :qf v glr2kaqjmv t work is done by 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 fd j350a 0le)agr /d9afi.folhorce between 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, g) hea.0jo5rd0l/ fidaa l39fwhat 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,a:jb4ify m6d5 level surface. It has 24 J of kinetic enerf:d 5bim4jy a6gy. The friction force on it is a constant 0.50 N. How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg mass on a level s ;mvm:xits9n 9zm/ uu+urface. The coesm+t9 9mvu/nxu;m: zi fficient 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 change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope.hqhl(p,iax - . If the work done by frictihpa h i(l.-,qxon 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 plane is 4.0 m long and rises*, epv8njl7e k 2.0 m. It requires 3200 J of work to get the bl8v j7peke,n* ox 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 thes.cw m:,h4rz0ngg.u gpue(8 k 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 afterewu.4 pzncg mr. ksu:80h, g(g 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 ground with - jrvh *2mj1ava velocity of 7.00 m/s. What average force of2j1 ja-hv v*rm 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 whehr ukz6y jar(7y28e- sn he runs up a flight of stairs 10.0(u8rhzs6ye2 - j7rkya -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 cons8usx3 - 1e //oymzttwktant velocity of 5.0 m/s. What power must be deliverwoxu1y3k t//tze 8m- sed 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 t s)+b4ojhv3mby a 1.0 hp motor that runs for 1.0 hr? (1 hp = sv+ )4jbm toh3746 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 ri3rd7mwixkf tipv1e )h 42k07yding. How much force does her foowvx kfip1dh04rim y 7)e3t27kt 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 in 7.0 s. u dz*ip+ku:441 k n:e alrpa.trfzg/5What is the average power delivered by the ez1u ae4k+rrf p:nkp 4ug.5:l /*ztdi angine? (1 hp = 746 W)

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