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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 exp4kt *v3rol5cqgx; v1tressed 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 )86zrcy w)h: ljj+bax 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 stationaj je34qpi .,ikry brick wall, the amount of work you do4,ei kj3qj i.p

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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 lifthp91v *w +0oxmt, fukxed 2.0 m vertically and is being held there. How much work is bf,m 0px+hvu9txk 1ow* eing done in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity dunt7.e+kja u)9p-ka carrying a 10-N obdk.+je tnu9 a p-k7au)ject, 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 vertically 3.0 m then returned to tcz-u0po, om; its original position. If the total weight is 30 N, how much work was do0u oop,c-z;m tne?

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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 pb 9q.qfn jq24object 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 ;hpnp/4z;/o pp aqv f8work done by gravity while the ball goes up with the sign of the work dqph;/vpa n pzfo4/p;8one by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus positio:gmd- nca;xq /dnt :n*n (F vs. x) graph, represents dnq/am;nndgx-c*t::

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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 repretju1hl f2t1 p0(p 1i*7wcsn xasents the work done by the forc1c* px upfla1027 j n1tish(twe 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 donem;a1.t q0xfjc on an object 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 negaty;qpeh ,s:nuj1 qyp .*ma*bcrg -)u9tive, 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 objec fibk t vkpe(e.+ xp0ot;+-u*et 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 tht;+ 7lm/eir0s rir3z se speed of the car. Which stateme7/r0zsiilre t ms;3+ rnt 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 ca7k s:g t.kk:pwr J has half the mass of car K. The kinetic energy of ck7k. wk:t: sgpar 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. What1e3lzp c.+-s suq)dy iigd5o 4 is the ratio of the fin+s4 ys pl 1ugdz5iqdo-c.3ie)al 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/,tbob-u2i vw qnr /0zajbvu/*+ bj,x7v0vv y a speed of 3 m/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 the rock's mr w7-,2y,x+0/aubnj/qbv viv bzv/ vj*uo tb0 ass?

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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 mass is moving with speed x )lu2 wug5hy3oqr5/e 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whice hw)o 3 5rx5g2/qlyuuh 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 dist5yfs br* a009tp2giqj, 5ik9u vnd:iqance on a straight, level road. If you had been traveling twice as fast, what distance wouln 2b9ry* 5kds u0q 5ivfji9,atqip: 0gd 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 sktm2u.tfu 8 ao9w nt/j3b7 g3any friction effects, what happens to the planet's kinetic e .k2 79m83t /tu 3fbwnaugsojtnergy?

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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 2d/)ye; q*zzs;o - x-s2b vuzokn/hseprinciple.
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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 system8o:6ugp tgf (b f.r c,ydmi-9e to have negative 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 fromzvik.a. g d(hmx *f)7p rest a height h above the ground. A second object with four times the mass of vp f*ai.7x.(mhzd) kg the first if released from the same height. The potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causes -mn6.t mha8 yv7q .zup4be9 f7brqr f+it to stretch 5.0 cm. If another 0.200-kg mass is added to the n m7b amhb9p-+yr 6 z .e4uqf78vq.tfrspring, 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 mechanical9pe poh(m, lzi16 px(x energy 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, to *bijjf +k,:cml;p5n o its potential energy U.ofkjcnj;l5 ,b+: ip*m

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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 i3tbnp5k(n( i,, qwy nul)vnta9)vu6 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 al *pdnu- 7jtoi861 2t *jjuanere sliding with equal speeds along a level fri-*nj te*18j2ua7 tiou ljpnd6ctionless surface. They both slide up the 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 y6pjy ;qv9 0vl ,)arsg$m_{1}$ 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 nr*whl ;(ne76ws g2hzm7be4,px) xqhconservative forces,gxw2 w46ee;l xqhsnn 7 (m phz*r)hb7.
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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 presenxxq41vdcs+;zk3 u9ss2ki.b qmiw39j 1 kg sa5t), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the to xdq3 a1xj.ksv3qswu2sgm+zbk4 k9;s1ci95ip 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 distancl5; 9sr ,*,d muf2rn o.kfwppue and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy,* mprf5n2p9rkfw, u losd;.u 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 30 J of gravioq )sjh+ j.o +rfq5o1,e(otpitational potential energy. Do not ignore air resistance. How much kinetic energy didqs p1i+5(oeo ),q fh+oojj rt. 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 conservvp. yw9r+zc7 qgn; b+eation 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 isk ng;e:4yqa9+de7 ikq

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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 in n1eaezes;2 8l,ktx .f p4 bq/czc2h9pjuy: /wSI 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?8qjctkvjlp 13 wx)e:45i f a-v

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterdayobgp yid1ok( . 55 q:utlcmott;e);k., you did 3 times the work in one-third the time. To do so,) t15pbiudlkkt;.(o.oymq ec:5o ;gt 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 consm g -:;lp /4v6v 1llpvlhvtgs1tant 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. Ifk(q;k 3hgun. q the object weighs 90 N, how much work was gnqk(3u.kq;h 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 disxy dcoby871u8tance of 1.0 m, at a constant velocity of 0.50 m/s. d1b8xy8y7cu o 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 force of 5500 N for a distai2b1aqj9 mg6 /ylvfss(mn;*;rx0rd qnce of 50.fr/qr;(as;xi6gd1j 2 yns 0v* mm qbl90 m. What is the 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 consty;h)k;s*wml/ jfgnurz3 ug,x5o 0 1azant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of theyu;j xof* u/h5)r3;m1zaw0, kggzns l 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 constant force of 5500xyxhgka-1r7vdv, lr/ p.cz) m 31hv8 n N for a distance of 50.0 m. What is the net work/dmz hx)vcxv k pr.8-g1rn1a7y3 hv ,l 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 t0aad:/+b) e-vd w ;dey rd:o1akx3 bjalong 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, inclinji lb:4oolf.fj) e,:qz+v -dqed 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 ng.kq6l5gr3z sled on an icy surface (assume no friction), wiq6ngrg lz.5k3 th 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 di 0 keo v2dn2idx7+htv(cw1i+p jqc 06umr/ +ntrection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the en1+qv htxijw72rpn vmck+i o +6 d0dtc02 (u/work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the f 32xx-c8,f o: got86o hgxcs ql1xes1lorce. The graph in Fig. 6-1 shows the force versus the object's posgt2o6cq se l- fhg13l:xscox x,o1x8 8ition. 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 Fig. 6-k3v -ui3f5l yb1 shows the force versus the object's po3k yfi-v ub35lsition. 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. T 3g : 14cpod(o.l2lmaue * dbrjsto(:nhe graph in Fig. 6-1 shows the force versus the object's position. Fi:*nj13l( :oe oob sp4tucg dml.r a(d2nd 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 (initiall i-djrr9 z9t4m lxpc -ch90)bwbzso. 4;r2qe xy at rest) across a 10 m level surfacee0b c-d2o9 qr99 ) w.lc -xxzm ;z4sb4jrhptri. 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 55-kg cart (initi8 v1qy5l( doenally at rest) across a 10 m level surface. What is the final speed of vdl1(qy o58nethe 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 ie 02n4vy5e4g w ysr2g* dd)gmrs required to stop thdvdn) e5yw4 0 r*sm grge2gy42e 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 b 6sb6u z1ht l;la-(gwg s.*0-ykjx4j;y t ulecar initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditgeb .tl4w0l ugksyz6;a*-yj6u-ls; jhx1(bt ion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exertingfy z evh7c3 8o9ppvnx4 7ed5x3 a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuyoh377pcvfzde np5v38xe 49 xming 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 o1 d(ivm)zwy63 k7 ;scvzxn)ordqi( w:f 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts fro(z7o1:dy3)i;6w( nv xdkivqzwm s )rcm 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 isaa49a*2bmf bk- sfig8 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 stoppaa8gkmab- *f2 bs4i9f ing. 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 movedmx:c 8gx6kv q/ from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational pmvcxx6 q g/8:kotential 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 and t3dxxao+2jl k q48d.nrises 2.0 m. If the plane is frictionless, how much work xlxo3ad4j2 .8k+n dtqwas 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 thenemem2 1 xb pkl 5o, l;:5nb8qw7wqlg2 spring to stretch 2.0 cm. What is the spring cmko2qbpbn7mnl; w, qw52:g18l5ex leonstant?

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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 apz ramxzwjof6..r; *k* : yjp; spring constant of 60 N/m. How much potential energy does ifk6w;jj y* a;zrx p. .*:zrmpot 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 compress an qm cju 6c.)qq8initially uncompressed spring with a spring constant of 25 N/m by 1j 6)cqq8m.uqc0 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 skt9qvr2d :z2dc3 bl;jo;v;tfpring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is ak9 t23 ;jcr2of td;lqvb z:v;dt 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 compresk g ;.*aa,iibsozv b 5;r;h)iesed by 3.0 cm. How much work is require5b*bia;s;ie.hk vi ;goaz , )rd 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 sbmw.+8nou )x i 0k(*)fj69wytqjf b rwlope. What is the speed of the slier on reaching the bottom of the sl * )j)w9wf( kf6 ij0w8nby .or+buxmqtope? (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 o.z5ywqva;alc,cm3+ qh haw fv x+ .0:a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m .qaz,+va h 0 ; l:cw xfv+5.amyhwqc3oin 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 thzlxo; be5.2hyzb6al 4 e bottom, it has a speed x 6;zol. ybbelhz52a4of 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 flow6p 3l ti27+7ldfltldd ofjn)wp9 +( cor. When it is 0.70 m above the floor, its potential energy ex7f+lndw(+2oltdfli) c97w 63 ltpjpdactly 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, weighing69gsuj,4 jyxx 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact tou,jy6sx jgx 94p 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 energy of 220 J. Arzu1it: fdp5f3 w(k9 b9w 9qeut the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did b399 kqr9u zdei1:5w wf(ftpu 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 frlsqu.9) swas 18wzk*k om rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of th9u1* ) zsak.sk8lw qwse 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 above the bott )sy4x.eey5nrb:i 0prom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of4p.y xeinr: bye5sr)0 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 a9c qz7iwtgz1*v + y x/lyd)l(x point 30 m above the bottom of a dip with a speed of 25 m/z vq)lwt7x c +xd*zyylg1/9i(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 dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its swing (poinw ck4(8nb gpsn*a .jo8n *mc.ft

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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 verts7/5awwvst4-bw.p c cical axis and released from rest. What will be its speed at the bottom of iwbs c -w7ct.s/p4v5a wts 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 (trjn)zy 2i22a (qh7c ve kdj(spring with spring r 2 v(ci27(q2ajkzt)h jy(dneconstant 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, slowi i9wx0xuid 66phh6 ;ojxgse e62u +toz;kk32s down her 2000 kg car to stop for a red light. What e6k k x 06i9;62xzx2u3j6gdwsh+tu;op ieio hwork 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 force between a 60.0-kg object and a horizontal surf obj)w l8rt);s;w/osfp - u;oface is 50.0 N. If the initial speed of thebs 8;l-rw;o tp);ofu/wos)fj 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 surface. Itulm 2cz- y3ab: has 24 J of kinetic energy. The friction fz u-ly3 m2bca:orce 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 mas)g)h wev3an,8pi9 hx2gnrg 3c26ceyjs on a level surface. Thhncg2,crg2) 3nwgjye)63i pex 9 vah8e 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 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 toz+8jjp .xp7g l .a/,c ye9nsz eh1v6ykp of a 50-m high slope. If the work done by frey./9yeph + 6njv78,lcj.agzk1xz spiction 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 lvh wb/* irhet73:2 /+bpbqju 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 the averav/rtq 73h:lbub+wib/ hep j2*ge 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 planeil/ia;te:92he cgqb) inclined at 20e above horizontal. The coefficient of kinetic friction betq9i2;ga:belc/ heit )ween the mass 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 t 9s9-e h tqwy;c9tu1ynhe ground with a velocity of 7.00 m/s. What average force of air friction actt qesw -;t nu99h1cy9ys 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 hezi4phb 4 ; g*4gsqu-n )ou1wuc runs up a flight of stairs 10.0-ho)4b*;1u4s uqw4nu gicg -pz 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 t8:,hqx c +n gzp-n6,tc:uydvxo move an object with a constant velocity of 5.0 m/s. What ponnp-g txc:xq:, v6hud,+8yczwer 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 hp m:jz/+ bo:-t-tgc(y sli,lb n,smow8rotor that runs for 1.0 hr? (1 hpsg:o8jlztbi c--ot /ys b+mw nrl,,:( = 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 much force d 4y39p*(a0dkkbh dt yszgb;x*oes her foot push with whpz(g 4b 0yddk bx3;yt**ha9ksen 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. Whapr,p. zww+-o8 ola0ubuy ( q5kt is the average power delivered by th (.yku 5o u rpa+op,zwl8b0w-qe engine? (1 hp = 746 W)

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