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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://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://51fly.win/test60.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed in SI uni-o9 z hj9 cwp.lgh5mq+p6 itc+w)bah; ts?

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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 systemz6u(m /np/tw6fqip2p;trjq - 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+/psh 9-zgsuyif( 0bt amount of work yo sfg9/ysph+iu( b0- tzu 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 lifqj(x b*p3h0cxh q+kb5ted 2.0 m vertically and is being held there. How much work is being done in holding the qx5bk phbc+x(*0h3jq 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 carrying a 7**64sm3ba*hljiplxtc twde v3 c;o.10-N object, the amount of work you* vwpatocts3 lc74 l*x;djeh3i.m*b6 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 vertie*d enjr8ww,b8 y a-7;c wp4ptcally 3.0 m then returned to its original position. If the total weight is 30 N, how much a*w 4re p-ndt;7eypw88c j,w bwork 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 ku6u8xvalx ( )force acting on an 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. Compare the sign of the work done by gravity whiv6ioe 24i,8cs yklno g6)v (hwkh h0z+le the ball goes up with the sign of the work done by gravity while it goes d6 czohnigs2k(olhvih)e 6wk84 v +,y0own.

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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 pos v m(h/)om9yil gu/t)tition (F vs. x) graph, representstm)y 9l (tvi/h)mo /gu

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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 represents thxhd pu1b+w1 zko:8b 2(p xzp/be work done by the pwx kp1 z 1h+bpd8zob:xb/u(2 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 object is positive, then the o42eyf 03r* likndzoubzuf54o:+ ) sdxbject'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 kinuj 0ms(h8j7qcrz l;awk8j ;c2etic 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'suc9yqs,a1:j s , r: bhf7izwi9 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, qm6h-rjel8 (ohun7 tml. 0a4t and is moving at twice the speed of the car. Which statement is tru-(4rqhom mt lj h7.ne at08u6le 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 car J has half the mass of car +r+ gqrn,9emg K. The kinetic energy of car J, compared to car+,g e+gn9qrm r 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 wit4v1;y,jqjpve,k smf4w7yl0- n)sa xr h half of its original speed. What is the ratio of thn vp4v 1yjk mw)7yera0jq4,sl,;fxs - e final 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 a speed of 3 mha *m/osr .n)o/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 massnohsm ao)*/r. ?

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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. Ap5p tztx*w- -+zgpl;asq hc :2 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 greater distance before stopwat plqtz-h p ;c-sz2g x+p5*:ping?

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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 distar e57le/p(:i, ich4qy;v qds snce on a straight, level road. If you had been traveling twice as fast, what distance would th qi;s5s,pe4ci:hqev/r( 7 l dye 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 el)y sjv; r2ub8 5jl /.;p8oszpvnlvu+mliptical orbit. Neglecting any fric2 ljj uvuops5/ 8)b8vy; l.z; nmrp+vstion 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 :a:kk/mf f4fou)j g,fprinciple.
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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 (k dd)a0v0xmuc 1h(fqnegative 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 fr 5fo s///nsv(3a2 djpln7oj xbom rest a height h above the ground. A second object with four times the mass of the fd /p5b /joo27nnalvj3 s/sx(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 p;4 s -;phrptykiq+d/ rnnr04to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is add4n0rh +t;nryr4p-p;kdi q/ p sed 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 of a systej41w/0frp+b:1lri q wyjaou i t7 21lmm

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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 el+ny -b 525hijsmmg; dner;lmy5d+- nh2i5s gb jmgy 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 atyib p3sh53 81bdqqp3 af*g,h 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 areor llrb ,,tj2jwm9.w.jsi4*e sliding with equal speeds along a level frictionless surface. They both slide up the s i4m,ol jewbtw.l.s2r jr, j*9ame 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 n0eb;ovhr-( e $m_{1}$ 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 conservatijv)d;lwa4x7 o on of mechanical energy for conservative forces.wd)vlxoj4;a 7
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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, th8 ny0xr bsb+y1 pek12g0iqd. kk8t8zorough the air (air friction is present), to the ground below. How does the kinetic energy (K) just before strt 1oi+ 2e1pksnkbd8br0kg 8z yq80 .yxiking 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 yf(ag w-(q ;iuopvtt:qb*63d and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitaut pt:i6 yvqb(d ;3gf(o*wq- 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 vx1(4 eixx+ hlJ of gravitational potential energy. Do not ignore air resistanl+xh x4 e(vx1ice. 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 ene5*s/i u w ;wd;ihhfw3grgy.
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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 isgg q5zp xf f:wra2.v60isnn/ 4

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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 pjn9xq*g v g;yz(t*u m, q(zzgr d0 mz;qf+z64dower expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit2glp5we7ep9t)z. oo n 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 gei:,dbjd e).gv0wh ; did 3 times the work in one-third the time. To do so, your power outp :heid,ve.;0wb dj )ggut 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 const0wfciz6 4f(iu.rg c5 5p1iyloant 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 helk)jk0d;mc wxfo1av0: d there. If the object weighs 90 N, how much work was done in lifting it?a;: k1 0)ofk0mcjwdvx

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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 aic-6dr ucs3/)- mpdn lir a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work dosurml)pc /c d63id--n ne 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 ch vc k+mcu)g(m(a x-b9onstant force of 5500 N for a distance 9cmmb x-+)huk(gv(c aof 50.0 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 constant force of) kd7u 1 jahdf 4za8hcc,0-uhz 5500 N for a distance of 50.0 m. What is the work done by the weight of thafz8djahcud04 hc-h)zk7,u1 e 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 f ooj) :wuz98x9 lucuh1orce of 5500 N for a distancez uu99:co)wlju1hox 8 of 50.0 m. What 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 6.0 m up along ra: zib;lo0t(sq)uw 8a $37^{\circ}$ 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 fruioc2 y x(s p2up114jj/ v.nmfqt al0g0kt slides 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 (:i7en xx1 5cqh nie81eassume no friction), with a force of 60.0 N e8 ihni1x75qcne 1x:eat 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 g ucryt4h./ii)raph in Fig. 6-1 sho ic rti)/.yhu4ws the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.


本题所包含的其它图片:

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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 f.73yl 6aewt xin the direction of the force. The graph in Fig. 6-1 shows the force v3at 7fe6y. lxwersus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6-m/4er, ak5v3maalyo 91 shows the force versus the object's position. Find the wormamra ,3avy9k 5 /o4elk 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. The graph inzslw1 5 4v*v-ahk3eqt Fig. 6-1 shows the force versus the oblav-34v z 1w*5eqs tkhject'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 5 zmr,4tg9q-ev pu 09dx5-kg cart (initially at rest) across a 10 m level surface. What is the final9 ezqv4t-mugx0 9dp,r 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 (initial2 6vvr7gky8 ckly at rest) across a 10 m level surface. What78v r6k2v ykgc 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 wor8k 15q5zsek0sm7 gqsyk is required to stop tsk1587 ym50qsgke sz qhe 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 init119xb 0n.s4/vxf6t yehml dyc ially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under lcx nhb9dmy.x16/yf4te 01 svthe 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 propels a 10-g dart. It is cov sknar.3 *8zt2 tp4(f(evca jcked by exerting a force of 20 N ots.*k (fa4jp83ce2vv( n r atzver a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vertical component of 60o,9kj/1fsmk t N. The force is applied to a box whic 9/ oskmjk,t1fh 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 bale of hay, striking the z fmwvn)kli r3uc /sq 1 2v0:)e)j2yvhhay with a velocity of 60 m/s. It penetrates a depth of 20 cm befork n2 e)v1vl sfyzr2j:i3)vu/h c0 w)qme 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 cainkzh tz, 2t,(t/(p m above a floor to a height of 13.0 m above the floor. What is the change in gravitational poh( tztckt/ia,(nz 2,ptential 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 rises b alj:z:me3k3 2.0 m. If the plane is frictionless, how much work was done by thejem 33k::bzal push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. What is b(iw /7rt 9a/r+rgw ut0v5elk the spki gr0/t w+rw(9/vtu7 5el barring 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. How3v3b 7 we-xzgl 6a1ifo much potential energy do3g lvo x3- a1wbfz7e6ies it 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 6gk b1 owhzb;czdx83:compress an initially uncompressed spring with a spring constant of 25 N/m by 10 cwdzxb 8h3:;kcbo6 1gzm.

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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 syaczwzo +(:x4uj0j +)e j ylg.pring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume thyjxezzju(o0.aj g )++ 4yc l:we 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 c ww6o7o)a(b muonstant of 15 N/m is initially compressed by 3.0 cm. How mu6b) o7wwmoau (ch 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 50-m high ;u62ze ,(ymtah hz w/bslope. What is the speed of the slier on reaching the bottom of the slope? (Neglect friction. ueyt/(wzhhb2 ;za,m6 )

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a ncay8:lxe , p:hill with an initial speed of 4.0 m/s. Neyec8:l a,:pn xglecting friction, how 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 bottom, it has a sd do9ttzv gf95gyx2,+peed of 9.80 m/s. What is the vertical height of thedtd9ggtxf+ 9 vz5o, 2y 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 ay1 nhb mjt+u(/ek.3wl bove the floor, its potential energy exactly equals its kinetic energy. How fast is j hlubkny /+wt.(e3m1 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 3lj1 u-(lsvap3x d3zgm,x 3qmwith a kinetic e(as33 mp3 jgqdu ,x3v-xzl1mlnergy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic enerxw/dw )b f1hq4gy of 220 J. At the highest point iw q/fbdwh )4x1n 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 from resi ,j3 kx8/kdaut 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 the boiaj/ku 83,kxdttom 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 ; ogvpuj/;1bdu v,bcm;*u * obat a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the spee;dbu u1/b*;pvc o; gm,v*buo jd 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 bottom u)*i3d tuao ju joy*-(of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wi3 j *ayijuot()-* ouudll 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 a 000(f9n /bpyfduqsho 3op 7ppt 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 cmyr-9 eib6(e mk away from the vertical axis and released from rest6y-me9(keb ri . 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 hq1tctt wm71r5 its an initially uncompressed horizontal spring with spring constant 517ttwm1 tcr qof $2.0 \times 10^6 \; N/m$. 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(m nv3,:y l qx21l 9jfoni(euy down her 2000 kg car to stop for a red light. What work is done 1 li x(f:lymv39n,nujo y( e2qby 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 8bgw kih9l;6s between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object l6;8i bgkws h9is 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. It has 24 J of ki11cbh5nz ib7e ;7 gphqnetic energy. The friction force on it is a constant 0.50 N. How far will 5pe1nb71i;gh z chb 7qit 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-k p.rndv/t 8+/ct yu+-f /rlmtf*glnn1g mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. * lpu./nmfn f t+r8d1/r +t -/yglnvct 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 dr,z fbj3 o:1uthe top of a 50-m high slope. If the work done by frictio:of,d 3rjub1zn 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 ant6ot d lxfwhtk6*u(:. inclined plane. The plane 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. What was the magnitude of the average friction force on w d 66o.flthut(x:*k tthe 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 abo61 u)lvhi d5ic:xzym .ve horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after mivc.u 5: zh6d )1yxlisliding 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 hei,lxgwju+ b69u ght of 10.0 m, and strikes the ground with a velocityu lw gx6b+j9u, of 7.00 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-kg boy using energy when he runs up ah6zz m8e; jyw* 4wrtt5 flight of stairs 10.0-m h ty6;rzh4j8wzwt* 5 emigh, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with c5fupvv(n svv r/3m;9 a constant velocity of 5.0 m/s. What power must be delivered to the object by the v;m5vs/ vcp9nf r vu(3force?

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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 run 2fyeam1;k2w 6qfgt7 ds for 1.0 hr? (1 hp = 7 1t2f6d 2mya g;kqw7ef46 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 doe ; /2fedokgu*hs her foot push wug/hko ef;d *2ith 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 fkk; jb84hm p+from 0 to 25 m/s in 7.0 s. What is the average power delivered by tm;p4f8 b+khkjhe engine? (1 hp = 746 W)

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