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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 v rc;;l3q3gx5oh:z r oof work 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 i8qdz; cho+3jh4v 9q yis no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall,wup71pk(f;p +yfe5 lr the amount of work you pep+7r u1wffp(yl5 k;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 is being held there. How mu). bs0xpln v,nch work is being done in holding the box in thinb). n0,vlspx s 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 a6j:mb yoq6(vt constant velocity carrying a 10-N objecty :otmv 6b6(qj, the amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted/ or;tw8p(0 o /tsunny vertically 3.0 m then returned to its original position. If the tottsp rwto(nnyo0//; 8ual 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 on the obm,t b7,pwm7aeject?

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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 wt 10f8m sb6haxork done by gravity while the ball goes up with the sign of the work done by gravity while it goex b10sa6m fth8s 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 6eda)o *2qgmdposition (F vs. x) graph, represents)m2*6o edd gqa

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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 vsw,c s+si l:9fg. x), what represents the work done by theg,i +:ss fc9lw 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 oib* w kl8pky/mwt0p+l; c6 w.nbject is positive, then the object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negu0+j av+ je2mgative, 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 e;z)x wp(.qrjon an 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 a car, and is moving at twice the speed of the9zn89 y gkr9/7cu5n( mjfuv kgkg 1uq1 car. Which statement is true about the1 9mfk(g u 71gyjv kukzq9/u9cnng58r 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 ces. .s,7z.2s*- q-dd riuzw yz;kgvgmar K, and car J has half the mass of car K. The kisgd - gmvssu,.yqz.*i-;7d w z2kze.rnetic 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 bounces back with half of its originalvg-)0tiv*c cuy*id e+ speed. What is the ratio of the final kinetic energy to theg) tciudv0*y +vc -ei* 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 at a speed of 5 m/m) v))slq8 ivupg4 z5ys. If both objects have the same kinetic energy, whai)vv)lz84y mqp s5gu) t 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 wit(;:fpkgt51 vsiiw 9uvh speed 2.0 m/s. A 1.0-kg mass 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 greategi t1u:v59fksvp ;wi(r 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 yp/ hwpy: zp2;4 4glnup) s1e odt69thlour car in a panic, and skid a certain distance on a straight, level road. If you had beenh91 el;n/hu4pl 4so2pt pz)6p :wtgdy 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 orbit. Neglecting a0tjf (3pz/jal:vmc w +ny friction mpfl0+jt za3jwv ( c:/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 prij ( dc.5:ikn5 yuvf*jnyet/1inciple.
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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 neg,mo s(zqz fhdb.h75 8qative potential 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 /e1b 8dqyrr1a from rest a height h above the ground. A second object with four times the mass of the first if released from the same heab8 1r /d1qreyight. 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 s)7ptw j cep;uia.jx5(sq bywf37n:r 7tretch 5.0 cm. If another 0.200-kg mass iya7r7) (b n5j.pj;pt7xiec 3:ufs qw ws 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 odh;ji8p:-i n v)b(k01fya jzvf 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, to its potential e,x2dsuh+8 9bqxw/a xg nerg/xxx2h8u +9g dswbaq,y 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 driving up a h/6qmm nypf7 o-5ms7 inill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding with eqdxb u4zlpbx:k3z+pil1jno/9*5ya s: l51px oual speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater heightppo *ibnlz3xkxx 1sloa/55:d9l+p y uj:z4b 1?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses 2uvxkz o00,gjt 2puo46c +f4vhrf( qo$m_{1}$ 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 yta-f8 )7;b nwyy yle)of conservation of mechanical energy for conservative forcesenl 8tw;y)f by) 7yy-a.
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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 (h fd p,0z6yl xe rl:1soa;yu*present), to the ground below. How does the kinetic energy (K) ju p:;l*xh(,ld1y 6s y0a roefzust 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 distancs g r sfk+tmh82j3x yec9)eu1,e and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential ener+93 1)kmxysjrt2ef ,hcu eg 8sgy 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 loses 303cn*myzp gxb rc/) +9u J of gravitational potential energy. Do not ignore air resistancexmn3) *cbr g/uyc9zp+ . 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 enerxd 6zupv**9oo l 81vdtgy.
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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 isldpj92n1+ uxd7ub g 0wcbp7y4yf; k t2

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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 iing-3/qm (h hcn 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 powe:).qg+6 n o, ihirvd-chr- tyqr?

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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 time. To do s ;-dsyc+ia ez(/ nug2go, your power output must have be g2+y seg/(zid ;uca-nen

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's engine zk qm /tuo)fc(fm:skj+ v**6umust

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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 dc-xy , 4nc-sk xb1i:cheld there. If the object weighs 90 N, how much work was done ixsnc,b1ci- x-y 4:cd kn 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 c ;y c;w8kk4lxxonstant velocity of 0.50 m/s. What is the work do4cx ;xk8w;yk lne by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 550t j,x apg56bf5se0uq50 N for a distance of 50.0 m. What is the work done by the 55aj0b squf 5x5e,gp5t600 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 o:*r*x)w gr2d. y04 iwbkbrg5w*hptaconstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the.b4**5x ir*byawwp2ghwtkorrg : 0) d 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 pulledgx: 42yqsxy th83n v3n upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevatos4 gnx3q8n h 2:vxtyy3r?

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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 q f8:-:5x*l mvwhiuuaoxv-f0m 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 slide:/t5 k 15k2joupalnyu s 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 sl04z:lrn g8az12w /qnmtseh 8 f 1fo(qyed on an icy surface (assume no frilyqf(r/nt8hq2 eag fmzon 141s80w:z ction), 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. Th a;jssku1amm r+.jv40-sfc4g e graph in Fig. 6-1 shows the force versus the object's position. Find the work ur+s g14avcak fs jj-m.4 0m;sdone 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 objeo0 h:k5gw/l hug:rua 9ct 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 moves from 2.0 ta9/:ouu lhr0gh:w k5go 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 objecxsmbwc0; oxxv(-q+t6/ p t).bv7olcmt in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. occ .0-tv)xmb/wm7 x oqtv +s6; lx(pb 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 ff on -va c31)e(u.foydirection of the force. The graph in Fig. 6-1 shows the force versus the object's position-oefv fy anu of.(c)13. 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 Ni9cmr; dnoq6t*;o+vl- ;m eez is applied to move a 55-kg cart (initially at rest) across a 10e*lmn9oe;civq6 rd;z ;-to m+ m level surface. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a /zi6w0q3 m)ua+tjrvl 55-kg cart (initially at rest) across a 10 m level surface.wmti)jzu+ v0 l6 3/aqr What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is r*mx bvta4jcd05d 9gy3equired to st*4 gambvdj 09 t5x3cdyop 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 st ,a 0 82fkhq8rhk,dklwl45bhcop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the sahcqld8, r5hw28 fkal, hk0bk4me 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 7p 2cio0x dzod3h760w zgl5 lxcocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has nel z25g ox7x pd0zwd07hi36lcogligible 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 verticalqm0n*wjn,xt:r 6t- 80e ijifw component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from restjnwti6trn- *q w, ij:fme00x8, 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 shot horizontally into a ba 9h9(rznw8;b.glc,v gt6tbvc le of hay, striking the hay with a velocity of 60 m/s. It penewb9c;t6.g vlvhcnb,z (9r8 tgtrates 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 floor to a heihf-/pdme+ vnk: j)s5.t6on yfght of 13.0 m above /fed+jhvt.:n -6k5 f ysonmp) the floor. What is the change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plane is 4.0 m long anuoh3e/w48w0 pd/ uxcad rises 2.0 m. If the plane is frictionless, how much workeou 4c3 wawd0/uhx/8p 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. Whaog5.xwj9lt) f t is the sprolj9tgw ) x5.fing 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 constanixdyw 0y;y,xf-7tck)v n 9 zn*t of 60 N/m. How much potential energy does it store, whenyt yz9nkvwnc- 7d*,;xy 0)fi x 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 compress an indc70im(4; nsa8mr nc 8xrz/qi)d,bqgitially uncompressed spring with a spring constan in8qn xar);70dsi/mc 4m ( r8bdgq,czt of 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 of spring constant 40 N/frh(iwf7o )ba 2gy c)(5. nfbmm from x = 0.20 m to 0.25 m? (.ibwn)(gf) y(fr bo f57cm 2ahAssume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compre l. d6/qw q26x1bu+6ozcpbrgfssed by 3.0 cm. How much work is requiredz6u r dpow fl6bx 62gqqb+.1c/ 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 slope7f-d a vjdh2b(x/p1ra. What is the speed of the slier on reaching the bottom of the slope? (Neglect friction.ravhxbd7/p j a(f1-d 2)

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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 kge -;lpahahc 8), pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, hp )ech; -ahal8ow 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 the bv6q 3caxqiyw ;1l 7h8iottom, it has a speed of 9.8q 1i yxq83l;aihcvw76 0 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 floor, its pote1 *0uge9frx jsrnn1l* ntial energy exactly equals its kinet*lr1s9xr n*1jgu0 nefic 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 straight up from ground level with a kineticbi4(aj j87fsnky f7v/o+8g .xqv-cr t energy of 40 J. At the exact top of its trajectory,c k-a4ofv .q(/ rbjt+8jsv inx7g7y8f 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 energy of 220 J. Atp z a/ ,n,zuh0s ds ,m,)ezqvi)4h)riz the highest point in its trajectory, its kinetic energy 4ami 0),szzip,hezd,u s vrh n,z)/q)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 poin kh.2. s.qvt oknoxt;-7es rf)t 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 sl s7. trs.k2k- t)q.oefh;xv onope, 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 mrk1 bj5 bpo3 * zl1,aotifa9-r/s 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 slope,b ab9*5j korzi1 po3ta fl,r-1 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 in )g(+6m5jpszi gv5vat 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 t+sg(mg )v6znv5 ipi5j he bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bott c-ch24m3:m d9 fo xur+amfeq/om 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 cm away from the vertical axis and relbzsjr. 8m:,e ceased from res zc r,em:.b8jst. What 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 txj sap7q8o61initially uncompressed horizontal spring with spring constant 6o7jaqp8 1s xtof $2.0 \times 10^6 \; N/m$. 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, senzs .9*d,6 mowx wl*glows down her 2000 kg car to stop for a red light. What work is done by the friction forcno w, 6xe d*lw9mg*zs.e 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 horizontal surface is fkg- 9cl/3vl e50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide beforf3lgv9ekcl/ -e 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, level6 whoh a:umgh**p5*iq*o dfq;ta)t6l surface. It has 24 J of kinetic energy. The fri *hau qqd *l5 gwt6o h*iht;o*:fmp)6action 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 dq+ wkz 5d*r8/8soro ea level surface. The coefficient of kinetic friction between the mass and the surface isrekd z5+*8oosd/ r8qw 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 tb :pwlx0go4 7uhe top of a 50-m high slope. If the work done by frl o:4xubgw70p iction 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 push/z+gxs0:/q e nu4owm+n. sp czed up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the bon/ /qsn:w+e. o40cmgx zpsu +zx 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 abo2zd wxi )d tz;.wf lt0qo5ds;8ve horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will;dz;z8 2dlotf.xqs i0w5d)wt 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 fromt3uy8qdn 7ht*.gc 3k u a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of a8dyk uqu3n3th7g*t. cir 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 f6mc9n +68btyj al;vzwlight of stairs 10.0-m hiv+ wb6zjc 9yl am86;tngh, 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 moveh f28vzqn ubsiol0o+- g.3mz2 an object with a constant velocity of 5.0 m/s. What power must be z i308zbo .vu2lhfnq2sm-+go 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 1.0us2j4u2: ork.mifpjj0k9y )+kueu y 5 hp motor that runs for 1.0 hr? (1 hp5u u2 ky0js94u m2pu .y:rk+k)o iejjf = 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 500 W while riding. How muc5li, 0a qyrm9nh force does her foot push with whelnq,5i yram9 0n 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. What is the averageld2l8n jq* 5hg power delivered by the engi5j*2nh 8ldl gqne? (1 hp = 746 W)

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