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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://mail.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://mail.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 o5 7:hsptkvxom);kxd-l 4q e+tf work expressed in SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on auhcpa4.. .m jn system 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 w3 fye2 j b(b;-ks txj+dt:gf,zall, the amount of work you 3dgb+j;yf jt2tz, - ke:x(bfsdo

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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 bein)mhn-t +ff5vbkc hj /ie:7)tmg held there. How much work is being done in h7t h5 n)/i+tmmhk ) cjb:vfe-folding 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 carrying atus0a jieyxr axf: :1f:di049 10-N object, the 0r90 sixti1y4:au:daj exf: famount 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.x :5 acg, p216xurielg0 m then returned to its original positiu5 xgrli:g26 p1ce ax,on. If 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 an object do work on the obj88ewpgj lu2 4ctez+d/ect?

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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 stra1d, mpf *ywz;*xesa2 aight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done yez2* f;d1 ,pwsa*xm aby 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, *tf i0o b2f2ldrepresentst2bi ld0*off2

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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 the work donedxgovt xhep.966.5o i1al u0 p by the force F th.l p05xe.ua6ov9oigd x16p?

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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 object's kinetic e nz,jc0u;1zeb nergy

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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 kinetic enerq,(zr(h, njrngy

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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 kineticg y3zgk eq3 /;, cehmlr*/9nhc 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 at:cbrh- 1+z. nznxe e*s a car, and is moving at twice the speed of the car. Which statement is true about the truc nre z+*n-xzte :.c1hbk'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 asmp7z()u1oxjb:p1oeuc ilw/. 7/ vz w q car K, and car J has half the mass of car K. The kinetic energuw u xb e17w mq .zp7/(zpjlci1/o:)ovy of car J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bopi6+ sdd7htl.vrq1t (qvxt + 2unces back with half of its original speed. What is the ratio of the final kinetic qdh+x dl2+si7rt 1qpt (tv6.venergy to the initial kinetic energy?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 /j3t0 dkrg (sfcq.qs5 m/s. If bot(fkrg j .q q0st3cd/5sh 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 with speed 2.0 m/s9g j7: 17r*qx op4k9sz dcmcjc. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels th s1 qo g7dcrjc*cz94:97jpmkxe 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 distance o8cyj82fo jua-qfj3,o 31m kcin a straight, level yufj1 8-m28 3 ajq3ccfjokio, road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an elliptical orbit. Neglet49+x3us ;pmf czdutt6*0hee cting any friction pf4zxtu9 dhc *tum3et;60 e+s 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 przmp4 .9 photiq5g/f m(inciple.
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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 4 4f en3.h6-etzexcwj6 u 4d9 tp3gujanegative 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 aiwlas- +e3+,znkb uqy 4fc()second object with four times the mass of the firsq4 c ualiaszewn-b(+f3) +,ykt 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 it to wo kse) e9b4+ijwd5(o 5;cyfd stretch 5.0 cm. If another 0.200-kg mass is added to the spring+eowd s5)9d4;f( keyo5 bwc ji, 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 energm)0lfzl*gd;th4q ctr:+hg7c y 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 i-1 v w8o 1ytagp7cz1axts potential energyoaa18- 1xvct1wgp y7z 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 drimy(qq4 t*zzeej( xa o0mr0/f*ving 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 hea,gn i3w22t c8: gzv p)37 ji/ovcsjuamvy object are sliding with equal speeds along pj2 7v 2o): 3s,zuw gvntj im/ai3c8gca 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 9p,6jli9c vc/yy s 3kw$m_{1}$ 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 ene )kdiu.8 e;c9mybh- nkrgy for conservative forces. i8kum.h-end9cbyk );
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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 aezz-v8js edt3 yx-). the air (air friction is present)zaxsz3ev- j-dt 8ye.), to the ground below. How does the kinetic energy (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. D d858tf wtbtcy1fcwa6 an/ jk-d3 s+n0o not ignore air resistance. How much gravitational potential energy did the ball loda6tj5+bdaf -c/tysk 38w81nft0nwc se?

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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 Jszhdm+.djt-/0c mp, t2 o*xzh of gravitational potential energy. Do not ignore air resistanccpmz.jzho /,d x2*sm-t t+0hde. 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 conservatirt; qj.uu4e,ak zal*s( 29qqfon 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 isr/ d7kqf wc1u eljkzhic;39:;

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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 SI * whbywz:-n(4yh5lq6)q swmi z6m j)gunits?

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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?u9w nbsdqd83 *m)wqpurr(,knt97 z4x

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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 4u oc o92*yrl 8lz/dxogg - mluc:::ymwork in one-third the time. To do so, your power ou:culm4 -ol28 zy:ugrc / o*:gomyldx9tput 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 actf3l/u u;uc) vceleration, 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 6mrtt 1w dzt1gnjiqmg;l7 -)vaw -1+ nheld there. If the object weighs 90 N, how much work was done in lifting it?aw;gn1 g-r- wlntiz1tdqjv16 +)t7m m

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, at au ,rzz++0o6h pzis)9xh0olnq constant velocity of 0.50 m/s. What is the work done by q0iz6z) osur 9,+ po0zln+hxhthe 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 wit9 +,mgc(pxk kth a constant force of 5500 N for a distance of 50.0 m. What is the work done bxkc(,9 mpt g+ky 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 cos0hbe99 d*iaxj c lp)+nstant force of 5500 N for a distance j+ei sc 9*0a9xdlphb)of 50.0 m. What is the work 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 pulled upward with a constant force of 5500 N for a dist; ,g6+m*exa gggxp:x rance of 50.0 m. What is the nxgxgar6e;*:p g g+ x,met 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 al :7 s mfmhw)+1e:hfhplong 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 slidm;iubj ler;m 45n/j 7pes 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 (assuv*d:a+0ir hvke ,prp;4 y;ufwme no friction), with a force of 60.0 N at an anv4+a*,vy phwr;0e: kp riufd ;gle 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 grap/3 /(xt exxaysh in Fig. 6-1 shosaxx yx/ t/e3(ws the force versus 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 )q*gbp9i ,fno in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fbipfno,q *)9g ind 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. T75v)ly -3 kq3vmqs16 lw tebuche graph in Fig. 6-1 shows the force versus the object' vsyke5mv 33u-llbqwt61qc ) 7s position. 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. The grtb2t qrscy1* u8d 6hd:z:vc -nadsl 4 5q4;seyaph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0q* qd:tuss;yv6tl 8dch2 4ya-1 n5cez b4rd :s 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 appm)yd4w7 n lbc9lied to move a 55-kg cart (initially at rest) across a 10 9)7cw4 ymnbd lm level surface. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initially aks:qbv+hxtl(1 up .8)9cn djf t rest) across a 10 m level surface. What is the final speed of the ca jk+b( :t1cuhq9.sxpf nvl8 d)rt?

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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. wqtac5;y13 k k How much work is required to stop the mass?aw qk;tk1 c5y3

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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 inws/ niil79o:litially moving at 25 m/s, what distance is required to/w7 io l:9ilns stop a car moving 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 propels a 10-g dart. It is cocked bygabw-*fvdgki :q7yg 1)h7x7 i exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, a wh)x iy7g vgg1a bk*i:7fqd7-ssuming 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 Nz bp84-gfy ,yd and a vertical component of 60 N. The force is applied to a box which rests on y8zy ,4gdp bf-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 horizt4a0+dsqb 897 w +yn02slgcwy r+ udyzontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrat4 s2y0a+ lswcud8yb+gd w7yq+t9zn r0es a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m aboz2iz5 54i8 qxw +fiibyig*dq 9ve a floor to a height of 13.0 m above the floor. What is the change in graviti5*izbgiq +yif4q8 d59 wizx2 ational 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 planezh0w s(ntlhq:kv 2+x) is 4.0 m long and rises 2.0 m. If the plane i2x +h swh(vlknz :0)tqs frictionless, 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+z+cr3ght sl-)0rv ct spring, causes the spring to stretch 2.0 cm. What is the spring constangtrc +v03 z)-h+ rtcslt?

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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 :s 2klgmc0x o 7jtoi.3potential energy does it store, when stretched by 1.0oi x0m 3l27o.j:sck tg 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 u8+mi0k3krdf h ncompressed spring with a spring constanf+ ki8hk0mdr3 t of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretchxmxhh1 g3cqjhp(; 3 6g a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assump1mcg (x;hq hhx gj363e 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 isjx 64:z:foytgtor; ,p initially compressed by 3.0 cm. How much work jx f ypg,6t:4oz t:or;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 frogz3:q y fheg/1+fz0hi,hnld7m the top of a 50-m high slope. What is the speed of the slie h1zen3z qihf0gh/ ,gly+d7f:r on reaching 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, pushes off the top of a hill wi xxrj, b;r/k(4kz( mw,tzeng0th an initial speed of 4.0 me;,z(gmnb x 0rzk(tx, j /rwk4/s. Neglecting 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 frictionb() wjhzl fnn(, gqgbt,c5 ;k3less inclined plane. At the bottom, it has a speed b;n cq, k )jbglw,(3 zgtf(n5hof 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 floor. Wheb mkt:i/pl;tmi2vj7 0*qy3zz wx (qo 6n it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is zo(pqk2j:t;i0 7ly *6mziv 3qxwbt/m 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 N8 oxfh.ac,p(n , blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanihn8,(.ox fpc acal 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 xv;q-ecitstku x mz,,v - /*z9220 J. At the highest point in its trajectoryut*tik,xv;zm ,x -9 /cvzseq- , 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 rest at a point 45 1a )8h kbc ozm3pa-d-1//hb- hyox alzm above the bottom of a dip (See Fig.o-/- b- axz1hl)yapa 8oh c z1d/hbk3m 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 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 poin zdki+pg,4x(a2 tm5 npir;n0ct 45 m above the bottom of a dgkiinm t2;5,0z+xc p (n4pr daip (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 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 star2tuojalr, h5o(axp 6 )ls1r;mts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m ab(r6a1;o5 lmjpoas l2t)xuh , rove the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom -klk :l.;r xpnof 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 vertida:(p p vow9nhw7 1dt;cal axis and released from rest. What will be1tdw(;9pdpo :n7a vhw its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits andu 6:h 2jvoo,iuu)utulmk.( 5 initially uncompressed horizontal spring with spring2dj l. io,tum( o k:65uuuv)uh constant 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 20j: -1hdyrpw-g;zeti5 00 kg car to stop for a red light. What work ypih- ;wetjg15z d:r-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 surface is abe31aoe4*gsk 38:qgfh0)w bl9sswm50.0 N. If the initial speed of the object is 25.0 m:o 1* ww)sa3 s0mkabefqg3hsl 9bge84/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. vpvp4o0 dg+ .8or gzd4It has 24 J of kinetic energy. zp0 dvd4vog .4pgo+8r The friction force on it is a constant 0.50 N. How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg mass on a level ; -twkmpqb9 5tsurface. The coefficient of kinetic frw;5p-btmt 9q kiction 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 top of a 50-m high slope. If the wor xc3bcs7q po m3+yf-)bh+:tf ak done by fricti:b+ m7ychpstbq-+o ax)cf33 fon 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 planib -u4 4f;mzple 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 fop-mzl u;b44f irce on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane inclined at/ozc*xwqy:1 a5 p(31h +qnsi tit9qcd 20e above horizontal. The coefficie5/nqth( p9siqt1z:qy o d+3ax c c*1wint of kinetic friction 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 th ,ueu ,4vcw:jae ground with a velocity of 7.00 m/s. What average force of air friction acts on it asc,ea:4uvjuw , it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a fligr((j f lm.m ,e:oodjja*r5o m4ht of stairs 10.0-m highme.dmjj l5ar j(, rf4om*(o :o, 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 t4 b cb. )e+ j-amgezh5awhyw86o move an object with a constant velocity of 5.0 m/s. What power must be delivered to the o -5z 4h.yeh +6cjbb8awmegw)abject 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 h: jy e1efv8-0jcios+s p motor that runs for 1.0 hr? (1 hpf8v jeses+-jic:0oy 1 = 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 ridinep*vp, av3mt :g. How much force does her foot push with when she is traveling at vta,p*3 vemp :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. i , qp3.xy5; q9htu lt5kzdm*y What is the average power delivered9 hq,tqpilx5um; zkd*y3y5t. by the engine? (1 hp = 746 W)

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