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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 expre)(gf4, .5 l(u(kclsxdvs uklissed 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 nql1u(rt/* g26br ep xsystem 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 wall, the amount /s ; ypmdhe6:.gvg.gfb+jjwh3xv *d (of work you do.jbv.hg:jdg+g/ewmsx d p v;6*3 ( fhy

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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 he(pv6dwv) i4p/n)czhr /ilf-m ld there. How much work i l)/p6 w-/(f4r) hdivc mznpivs being 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 ;f ig yj;zq3*oat a constant velocity carrying a 10-N object, the amount of work you f y3oj*iz;g;q 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 verti t; n(w-50fok0yjwtj fcally 3.0 m then returned to its original position. If the total weight is 3yfw 5 kf wot0j;nt-0j(0 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 objecgx0a1 s:icsut24 6fixt?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work dljc-c++)vkn;;j t s e5uy : c7bekauf3one by gravity while the ball goes up with the siv ;e+u scc7kab;jtc)nkyje:f 3 5ul +-gn 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 versus position (F vs. x) graph, represee6v z0c:wwa+ants0:a cw+6avwe z

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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), wh;9c4gqk5 h+ gbcy sj/qat represents the work done by the force cg9;hgjq bcq+5 4yks/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 positive, -gk/k+cf jv+ithen 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 angk8 x64fv lqz b3g6y:+o+kh6xntg nk . object is negative, 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 object is zero, then the object's kines.3( w *tkftld 8w1mmq/hq rr/tic 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 t:s+x38g gd x rh1 jwq3rk5+tdzhe speed of the car. Which statement is true about thg8hxr3 z:dwj xdks1 rg3 5t++qe 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 zq/ ur 5p7/x,fst(liyas car K, and car J has half the mass of car K. The kinetic energy of car J, compared to7/s/puxt iyzl5,qf r( 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 bosj9 z*6 -l0fsois*h gsunces back with half of its original speed. What is the ratio of the final kineti0 z 69-sohgjs l*ifs*sc 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 ab7at:5a pr4 r .bbwwt* 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 i.btwr :bta7b* w5a4rps 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 with speed 2.0 m/st: j/l cg+a; nr,naxq8. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are btx/;ac ,n8 jg:raq+n lrought 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 awm6chrczu44/hd5g +g panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car hau+ wzdcr gg5c6 hm4h4/ve 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 fy*bbe-mnrnc /k:8( rthe Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energynbcmr n/8f * b-eyk(r:?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energ9j(2bqy)pukd.i ) bxv 7tgl;f y 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 to have negative pq-w dn+..ie gec xs3wbi*smrxh,8 z. ;otential 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 ab9fsts:,tep0o( h-u kaqq+eh,ove the ground. A second object with four times the mass of the first if released from the same height. The potential energy of thfp9e0s:kq u-hh,o+(ttea qs , e 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 ot4g1g+.9l;hizg tr 5ta-ptas f a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sp;p9 . saat +zg4ig-thttl 51rgring 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 ol1;wqa 1ji8ub up2n*k f 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. Compargcdx+,o)-e u,1 dors,x ;nuhi e its kinetic energy K, to its potential enero x1,,cegx-ndu ;o ,d)hirus+gy 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 7pe7m6 4wduu3mu c eh: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 e hda6ld3g+9kc ; nb 7eif88 biox.kl7gqual speeds along a lloc6 xf;dn78bb9 l7k3g i edig.hak+8evel 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 2ikex8zq.;dnkrxt -1$m_{1}$ 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 conserc:5-vakbfvw/a jojz-x m6( 4ivation of mechanical energy for conservative forces.z:ojv6 ca b-a5 vjif-xm/ k(w4
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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 buildiwm ,kf-zlmb v- 6v:3clng, through the air (air friction is present), to the ground below. How does the kinetic z b3c:fl- - 6vwlm,mvkenergy (K) just 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 distance and gains 30 J of kinetic energy. Do not ignore air cn0s-, h(yso;ic 2 lqaz d43*dz3;appm hguy0resistance. How much gravitz(ilp0yo ;y m0asd243h-uh c sz3c p q,;agdn*ational 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 and loses 30 J of 2.z jal lt,uk/gravitational potential energy. Do not ignore air resistance. How much ki /k2j.ltua, zlnetic 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 conservatioe ik-,+2.ke pcy1p vfyn 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 isu3 5ki)dc ovz1pnr++u

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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 uyk-r b+(xn(igr x:i-onit 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 afe- )/7udpv9 nwdgo,7n*sau:zlu 4 k is not a unit 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, yd-m.kf9t 67d9 vxih1,wq 9fe8 h mntpoou did 3 times the work in one-third the time. To do so, your power of1v-ph, 6x9mn 799dkdt. oiwm8qtfeh utput 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 accele dl4 ;lhne8opf6ozwlptl+++ :ration, 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 vertica59owm ot)g60ymwgrd,lly 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting io0mo ,r5tgw mgwd) y69t?

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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, aa:miz l3cd3v87 r:jz pt a constant velocity of 0.50 m/s. What is:a:dczpz73 mlij3 rv 8 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 5 n fzn95hzf1r-500 N for a distance of 50.0 m. What is the work done by 1fnz5 rhzf9n- 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 withvfhiqa/i21 xgu - l-u cgs35;p a constant force of 5500 N for a distance of 50.0 m. What is the workaihuv/ 5-2q pfi -ls 31gx;cug done by the 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 pul+ylscq5 *xacqzz3(b 7led upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work qyq*z za7ccx5s+bl3( 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 along a j(d fl76yf h*f$37^{\circ}$ 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 ra*w pvcr) fo77omp, 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 (assume4y1 xp)-cv 4lbw* ucfw no friction), with a forlpcvx u f-*cw4wy14b )ce 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 i1+q7 wtj)w7lpnc 2e xin Fig. 6-1 shows the force vejnwcq2xli1tw+7 ) 7persus 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 graph in 7t us queb5hcmtz; 097Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.eu9uq;5 z0h 7m7ttscb 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 0m./a s lrc3dcgraph in Fig. 6-1 shows the force versus the object's position. Find the work done whenrc sm./c03dal 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 ftuzfp4 + f,7vforce. The graph in Fig. 6-1 shows the force versus the obffz7t ,+4 upfvject's position. Find the work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (l*owle q0o1z: */uptiinitially at rest) across a 10 m level surface. What 1 *0: u/o to*wzqlliepis 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 rhr;b.2 d3o-yg)wbtmmove a 55-kg cart (initially at rest) across a 1or;-b t3h2bd )rwym.g0 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 5.8 +d17prpy cem0 m/s. How much work is required to store1d+7 8cpmpy p 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 stop a car initially moving at 25 m/s, what dis kw kkkbdr .ta+sg:,.n4,n0httance is required to stop a car moving at 50 m/s under the sakkbt,.. ,rants0: wnd k+k4hgme 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 -b d-z2murz ,6 yutk*j10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leavd2zju y,m-6kzbtu-r *e 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 vertica;w(8q i hm3ghr652+aql- moarsfpc p6l component of 60 N. The force is applied to a box w ; -2l(rgq+w ohmp36amq hsr8ip 65fcahich 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 iaxdw/ vwpi0:5 paj7/n aq.kh 8+zztl5nto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping pq5 zpi lnk+/5htjvx/za8a7a :0w.d wforce 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 7gd5a4lr e51 ok.00 m above a floor to a height of 13.0 m above the fl1o 4l55g rkadeoor. 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 incli+/t.do gln2o)gvk r4- tsgcs/ned plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frn +kg -)vd4os/l2 ot.t rcs/ggictionless, 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. Whajgbil4 gtg 3b b5e,,s(wm22qft is thge b4l2s2mb5wjb gif (,gqt3,e spring 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 potenj1 ev(;c0vdp;f y kgzc9swb.jo* ;:sltial energy does it store, w;sspj j9 z. vd;yf ok*0gl(ccvwb1;:ehen 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 initially uncompressed spring with a c 45 *j+b/wzgih i)ef/t fqdk8spring constant of b cwq) fkeih+ f4 58/itgd/*jz25 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 od)vr+eqe+t4 a spring of spring constant 40 N/m from x = 0.20 m to 0.2 eo4dev tr++)q5 m? (Assume 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 compressed by 3.0 cm. Ho-paq3: s ag.iaw0,nsq w much i :apg0-sq.wqns3a a, work is required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50ny1bow0uf6 * ,q42qefhscqh7 -m high slope. What is the speed of the slier on reacbu7 2fceq hf*nqqo,h6ys1w 40hing 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, pusmjf5 b 08,(o*icrou qrhes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast ob*f,i q(murr0cj 85owill 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 bottom, ils zw 5c(y/,2au p2.hk 7eik0.kd5uzqf,wm kdt has a speed of 9.y0ldd2.q5wuz2 fk(c7 ehk,i. ,m5u azwp/k ks80 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 th ttg/v8)ku9phe floor. When it is 0.70 m above the floor, its potential energy exactly equals ih)/tgkv tpu89 ts 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, weighingbqdv 76*u)5a pi 4yaro 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To whatvr 5 )pob qyi6a7u4d*a 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*us gpucd790+z8 f tqu 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its laug87 sutuu*p d+cf09qznch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of a di r-f(,5l:erlquvyv / lp (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the nueyl:r vfl ,(5r-qvl/ext 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 sta)u w mua5t.t,rrts with a speed of 5.0 m/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, which is 30 m above w, atur 5)mu.tthe 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 bott/9g0* .d:hpn-1q jtj yxizv ndom of a dip with a speed of 25 m/s (See Fig. 6-2). Neg gpj :yi.xd nh*t-0zq1vj/dn9 lect 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 of0;q iu4;xr r1 0p.gnoxro0rma+s oj9a the 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 go0 pnf3g9j8c away from the vertical axis and released from rest. What will be its spegnc3 f 80gopj9ed 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 m0cubw/1prb m(w jsiah x(0xpby-6 , e./s hits an initially uncompressed horizontal spring with spring constant of 0 -,c.x wujybbimb1 sewa(xp p(6rh/0$2.0 \times 10^6 \; N/m$. 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 rt fhg6c7bq4q5q:z6 xd ed light. What work is done b6q4: 6hxftzq7 bdg qc5y 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 andzx wy/5gxjo9 d6a13dp a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide bj6zxop 3/51 gxa 9ydwdefore 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-r-/cemd vny7fnra 64 on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N.cd7 y4naer6rn -v/mf- 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 h0v q0m8n.exap(ia5c9:spoi;n 9 f i t(n8bg arorizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. Iai0 v r cm9n9aibao8. gq(pi(fnx08pns5et: ;f 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-m3dp omv llh5-g tvj+7+7czlg 7 high slope. If the work done by frict7g7jod mh-5cl l7gv+ +zt3 lpvion 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 ril/s,j+,+h*mrqdm1/qbykk , lj 9 qtzjses 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 average fric/t 1klz*ljk+,md ,m/jqjy9 ,+srqbqh tion 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 atad4vf, r2k6 (:kkp hmq the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after slikkpmv(akf2:r hd q,4 6ding 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 wit1x/pcxua / xo+h a velocity of 7.001x+caxupx/ /o m/s. What average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg3 h(x;i 3yacp/pcfqg) boy using energy when he runs up a flight of stairs 10.0-mcaixf;3 p/)p qcy(3gh 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 needeiimi .6l i04pgd to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the objectii.04 i6mpilg by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (,b)fwszn.ft w/:8km2 ,oweowh bqw7.1 hp =zk who)fe.bsw . n,/o q8www7tm,:2fb 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 raf,zldd .e0mo /te of 500 W while riding. How much force does her foot push withd m0. do/elfz, 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 average power -sy . 1xtp1 n:y3rcj.r.*shcbj5p uj edelivered by the engine? (1 hs c. :y1jjhtsyxp-1p.c rn .r5*e b3jup = 746 W)

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