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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 esxxhn,* l2w w3xpressed 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 thb (f,incjau/pdma;z *z9/ k5uere 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 wall, hi3a )roe i9 2sikqk13e9 ag/bthe amount of work you drk2/gsa)i 1ei3 h kb9a3io9 qeo

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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 verticallydmc.cm * fu4lt.)yar-:/lkwt(sm.ba and is being held there. How much work is being done ins(yurktclw..t b-fl *a4: mamc/) m. d 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 aves 81p -vw;cg constant velocity carrying a 10-N object, the amo-gvvws;1 p8ceunt 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 its original po ;cqxe f+;qhr-aj+ih/sition. If -fc xr/i;qah ;j+heq +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 u.7jax7 u3cecan 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. ccj* dxime,.+ Compare the sign of the work done by gravity while the ball goes ,+md.xc*je ic up with 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 Force v av:fc1.abwo7 0mdw3hersus position (F vs. x) graph, representsahwd7 a1:wc3m f obv.0

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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 i rr cc8) /8reezpj ce),xl3u)(F vs. x), what represents the work done by the force3c ru/8z cxple e,))ircrje8 ) 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 *k 2cmdkie 6i *a3nemlx 3po(uu--8 vdpositive, 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 negative, then the object's ( vjxrwe07i7b 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 objey))9:krhi- +j i 5 enamkd3xsuct 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 mu +f nnn:8lhjm+ch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to nm:f+nln+ 8jhthat 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 6nziykrg prx-00m4 +wK, and car J has half the mass of car K. The kinetic energy of car J, compared to car K 4pz+rignx0rk-06 ym wis

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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 bou2no*9kf vhg5l0o4yz h nces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy?k95nyh4fog* l0h2v oz

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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 cqq2w,- 0i d;p* raux+fwohb1 3 m/s and a pebble is moving at a speed of 5 m/s. -x* arp+,qbuhw2 d;1fwq0 o icIf both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving w 5 z4e.v6blprz;kka9t):ox pzith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objecbzza;vl. 6z 5t :k)9orppek4xts 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 / q:oz8;rrjve1u 3xn:t;ma vidistance on a straight, level road. If you had been travz1tr 3 mu;vi a :jo;rn/vxe:8qeling 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. Ne8 tp; lks r*hz,k,rs.csy93zaglecting any frictip ;zyrkz,s89* ,c.la s3hs tkron 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-energ691m 0x,crhjy va n,:dl9af;gjnye-uy principle.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system g6fcz sgz9:v rhmx*uxl/c1 ,8 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 from rest a height h above the ground. A second objeaf1aflw e a15)9uvz)lh: g oh4ct with four times the mass of the first if released from the same height. The potential energy of the second objevlz9a aa ougw ffh:1) )l45h1ect 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 se/ -kc 7hzl0g18q sziapring causes it to stretch 5.0 cm. If another 0.200-kg mass is addedsh ze7lzq0-cki1 g/8a 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 ene 0j*fkgbxje42/ s6ji xrgy 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 qsq,x33 q d6hrits potential energy Ud s,6h 3qqqrx3.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy ofl4mifvqco- org 6 ,4;g a car driving 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 with equal speeds along a(uq* ztxku4)uk (ta)zq4 *xu a level frictionless 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 7lu sxi l(*hs q/gb-a9$m_{1}$ 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 ene2/fgry -i sgks1g.d-irgy for conservative forces1 .gk/-s dsy-r2ggifi .
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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 xsx jf7+v 5; cm8q;szetop of a building, 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) azq7 mfjxe;v; 8+5xscst the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and +f+ev:rp)*aypf ch5b gains 30 J of kinetic energy. Do not ignore air ref )papb5r+ e* yh:cf+vsistance. 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 distance ana8x 4y.hv:5lpd9oc) (ut ji dod loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy hd i :5(l)ooucp 4tdx.vaj9y8 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 consqd9mezvbv;(xx 0:sy8 q6y lizo0 8s7o ervation 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 isc/ i8n2av kl5g

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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 expreh+t+px8-uh 9mxv- a skwb)l s)ssed 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 70a8(jhhh :s5fq foap 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 did 3 times the work in one-third the time. Ta*4mukdkdimh)15 8 mso do so, your power output must h81hd4m5*ski ka mmd)u ave been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's engvyg6(a cixl3r4x1zm49 8ssvb ine 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 tl( 3e(w2fibde lqk 4ys4m4yw 5he object weighs 90 N, how much work was done in lift( we2lyk (i44s45ywfeqbdm 3ling 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 en 6iou h ,y/dyft2s40up in the air a distance of 1.0 m, at a constant velocity of 0.i hu 2,6sy4nyf0/et do50 m/s. What is the work done by the weight of the book?

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教师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
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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 co f5;n)ih.5/tirye otjnstant force of 5500 N for a distance of 50.0 m. What is the work done by i ;ty fohn/5tji5 r)e.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 fo,: -ftu/iwiyir a distance of 50.0 m. What is the work done by thu/ ,:-yitiwif e weight 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 upward with a constant force of 55k+ok1.jj t2 yg00 N for a distance of 50.0 m. Wtj 1.kgo +k2jyhat is the 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.;()ioepm,frv 0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slidez :lt7l3-xlxp;nj b7hseq72n v 5oy0vs 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 .fytzg9od qfdzp 1pyr):0c6*friction), with a force of 60.ydpc6zt*9r)fop0 y1dg f :zq .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 fot1 b.0x7 ttio(vcjg. yrce. The graph in Fig. 6-1 shows the force vers.to(cjy7.vt xgb1ti0 us the object's position. Find the 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 force. The grap3 s/4gyb.titac bg1/- ric c-uho1qi9h in Fig. 6-1 shows the force versus tg3go t4.- u-/ cciibt/c91qa1bs hyirhe 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 dzfd, .t s7xg5vva.b0xy fke+w y3hx v //1p;bfirection of the force. The graph in Fig. 6-1 shows the force versus the object's positionpsdf7x/.y + ;1,v5xky 0 txzv3bhg/.b ffewav. 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 ie upol+q5: k/nn 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 0 to 6.0el+5o :qpkn/u 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;ni+; bvg dvh/-ip /ba 55-kg cart (initially at rest) across a 10 m +i;-dihpgv b; /n/abvlevel 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 55-kg cart (initially at rest)0 4pgbok3yx. q across a 1po 4k0b. 3gyqx0 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 5.0 -z( dj 9mhgv4vderq+z)-.b yh m/s. How much work is required to stop tb.jvy-z(rv4g9d em +-) qzhdhhe 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 mzv(rgko1 e/0,g5us jk oving at 25 m/s, what distance is required to stop a car moving,gzjg 0o1s /keuvk5(r 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 prq n)gj ,ttpe82m2twt 9opels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what 2ettj8 q)tgw2m n pt,9speed 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 compa*7 js qyns:-donent of 80 N and a vertical component of 60 N. The force-qydsj: sa*7n 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 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/p/(4xkuk,;d h-e2hw.nt w1da pz d vlle of hay, striking the hay with a velocity of 60 m/s. It penetrates a vph e.2pdnw1w ua-/xhl, dk;k4t(dz/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 bhcfnh v,dyp(q7. a 3ld ,mxr0;rq-1uto a height of 13.0 m above the floor. What mx3(p,h1r7 u- qb0ly;q ,vr.ddhfacn 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 and rises7u fs9 l)tfd) hmzjl0/ 2.0 m. If the plane is frictionless, how much work was done blm)fz js97l dhu)/t 0fy 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 springdo2( u-sv; mfv to stretch 2.0 cm. What is the spring cosom ;dvf 2u(-vnstant?

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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 potential ery bk i/bt8o9yt0u14mj)s2 u 41najmknergy does it store, when stretched / 2bkjknsou i)u1tmam8j94y 41ytb 0rby 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 rra wsf)wv6b )*equired to compress an initially uncompressed spring with a spring constant of 25w)*r)sw f6vba 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 sw9 t6k 73eilemgrqi ::is. rx7pring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unsi7 rewqeti:.9 lsi6 r:73kxm gtretched 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 p h s1chcgn:e):eknhy-2b7 )mN/m is initially compressed by 3.0 cm. How much work is required to com)k1mp2 :nh-h:gsn ec y7he)cbpress 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 6i-md-wu) vu 7(xjxosa 50-m high slope. What is the speed of the slier on reaching the bottom of6v -j sxi 7dowu(-um)x 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 i vdh( 4(f(/qrujuc3zoff the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after duf3 /(( qz4drj uvi(hcropping 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 bok e,,wl+ik;,c tb*erl ttom, it has a speb,e kl, rtc+,;ki*wl eed of 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 theefoab9vis3 r,q+t- mj -db ,ow0xek;* floor. When it is 0.70 m above the floor, its potential -tb-eb saox;mwjf*,3, o+eq 0rid vk9 energy exactly equals its kinetic energy. How fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing ukx-cxrm1gs jb kqpmwj,+o *;d(;x21 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its mr;ojxw msk pg j *qb kd11;xxc-u2+,(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 h9tu/)qku g)mu . +i0nhsc;fa leaves the ground with a kinetic energy of 220 J. At the highest pn )macuhkqisu+hf9 0; /.) gtuoint in its 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 yn7hic82vbm 7,lyf/s from 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 f b /myh8y7sn72ilcv,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 mkbvr u-a/sp 7:7u ;u+ 2at3dn(vrtvp t/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Ne3k( vtprt a br-u:v/;s77vun+t2pduaglect 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 bqg8xjl9;n2 f:y exv)fottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the spj g:;9n)ff 2v8xxqyel eed 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 t2; q51 taa lk/jimrm7xx.hld;he ball at the bottom 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 re(6n nac82dvam leasenn 6cv(m da28ad from rest. 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 hj:nli v+tl4v1its an initially uncompressed horizontal spring with spring constant:14 +jvll nvti of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a reoevu bvokm6 /.kv; c6*d light. W.kuv6c;m/kevo*v6 o b hat 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 force between a z 2kkitf5* h25*ulcsz60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a 5fz z c*s lk*kht2ui52stop?

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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. It has 24 Jvo uw83drjfyvoh0 mh;(8ig1, of kinetic energy. The friction force on it is a constant 0.5h3 v;ov(mj,0g dohy8f1ri wu80 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 ltj1 ka(u.khs-z0/y pgs5m;a eevel surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a dista1-tu/s(j ak0;kmhz.s pg ay5ence 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.r8 p l ,n.ff +vv1terld.s1xf1 If the work dons1f fpd,1 r +1tllrvfvx.ne.8e by friction 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 p0a+mptyw x 87alane 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. Whapaxyt807 w m+at 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 pjf4 t8lw tlwjsbap*0m 2+l7py o+c 5;dlane inclined at 20e above horizontal. The coefficient of kinetic p*s5 7f4 t+d ll; wtpojcbjlm+a02wy8friction between 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 thaom dx;l)gw 6:e ground with a velocity of 7.00 m/s. What average force of air friction acts on it as iwxg6:lo md;)at 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 ene;,l m)pr7ycti yjxb7 to.)zc )o+ 8xvdexg*v-rgy when he runs up a flight of stairs 10.0bx .,)+ yc;do *7p 8 )mzvtoeil-)cgtxjr7xvy-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 mov avm5ij,t yolza17 3(he an object with a constant velocity of 5.0 m/s. What power must be delivered to the objecto 3maaz,1( vh5iyj7 lt 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 1vddsp0/x7jp2 .0 hr? (1 hp = 74/v7xd p2js p0d6 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 5)vmu)uobi n+riding. How much force does her foot puu+ 5nm)io) bvush 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. What is the mqtbm aoa/ ;g9yl.9c cw(1d.taverage power delivered by the engine?mao(99cyd . blq;twcm. g/ta1 (1 hp = 746 W)

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