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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 unitx05-.h0ql v e ifuvyf7s?

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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 q -xz:jf14 lefsystem 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 againskd5s *)htk4ep t a stationary brick wall, the amount of work you4pd ks)h ket*5 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 lifted 2.0 m vertically and is being held there. How much.omr* 18yprya)nltt5c58o a n work is being donepo . 8y)n8a5tol1c5r yntmr*a in holding the box in this position?

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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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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 const 66l/z1gc ji:euoi;mj 0abl 5qant velocity carrying a 10-N object, the amount of work yo:ubm;i 6ge6 oljq 15/ jlz0iacu 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 vert *kgs ,ybc*rrn)2 t*d02zbsyyically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was donrb g2ybktzr**y2c, *s 0 s)ydne?

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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 gg7 d8ul,1cuk p6c7 qhobject?

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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 jw;sjk5u:po2 up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work wk5j s:j2p; oudone 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 versusl -jmi,)ufz)g position (F vs. x) graph, representsmlu), i) gfzj-

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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 wts9e 0o wf j 09epcjoaf)5c1stb;)+sqork done by the force F o519s9 ta; )+cp0 )qjsojcfbwefst0 e?

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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 positzqn; yto 8d(/my;d8 u tie(nj0ive, 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 obj i0ig-8)(y uf1; 7nufyfu0x bboh0uzyect'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 z94: kqmdtp6s on an object is zero, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is movingz ux(6 :em .hnklpy0fb 9n6hu (k0tdcz *dt+d6 at twice the speed of the car. Which s ce xtdp(.0k6t6(:uuy b+zh *n6l0hkd9fdmzntatement is true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car K. Thx3g6:7us krlde kinetic energy ofkl gdx7s6u 3:r 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 bounces back with half of its original s a o + p*oj(m6:a-kxsi5y41mxgpb h5kvpeed. What is the ratio of the final kinetic energy to the ini(so 5-* jxi51xpaa kvbomgk 6 hy:+4pmtial 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 u1d ( f;: fpzz9;lg8 nmbgorb0y53vzi m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is;m0 zg1o8 fp(;5iy :fbzlrn g3uv9bzd 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/s. A 1.0-kg massf7 l667 gjz3u xsis,bz is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest.z66b3g,7u x zl7sjfi s 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 panipq a8a6wn :po:c, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distancwaa nq6:opp :8e 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 orbi/) kxly.hw5*yowp b9xt. Neglecting any friction effects, what happewxx5h.*p/ k ow)ly 9byns 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 prie:jpz 1 zwy1a1fn6:tunciple.
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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 potential energ*h5 cl 8*ruabhh0aq5 mgiv 2j y0pq/-bkp*zt7y?

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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 )vvt3q jqa)x4ground. A second object with four times the mass of the first if released from the s) qxv )3q4jvtaame 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 ox1afeex,/x- a c+km;;*a bbjaf a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, th;aaea-e1 xm,k xj+c */ bx;afbe 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 en3fmn 5 8xti4wb)jxb)p mhct5wg5py9; ergy 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 kine.40ei5rwgc6ndbu mk2tic energy K, to its potential energy g.0icbkr 6n24mwe ud5 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 wbt 07f7b+p j;stpgnv emv/51a car driving up a hill.

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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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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 alongf *sb-gpg0; zi a level frictionless surface. They both slid-s ;0*fb ggzipe 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 dsj2 bekd4x b/-brn-1r 7,u wx$m_{1}$ 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 g,(y8b y+ae.t2 qzau .ht2 wyamechanical energy for conservative forces.g ,8+aawe2yt.2ht.ubqy( ayz
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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 o0e/yw )zf.-mfwfnsn tj1.3 r ;cp r/ref a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before zp.ff1rec/n .rf wmt3;s0ej- nrwy /)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 diuo8k :uf2dt 2ostance and gains 30 J of kinetic energy. Do not ignore air resistance. How mu2u8d:fouk 2o tch 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 and loses 30 Jcb(faho 1+ he+jp7if: of gravitational potential energy. Do not ignore air resistance. How much:e+ fofhp+c7( a j1ibh kinetic energy did the ball gain?

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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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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of energy.t.c17w7- ody klp gsw5
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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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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t isbc m8p4b9 ,g7acw5u(zfbyo, z

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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 iyz379cf4ic k*7q(wt over p: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 is not a unit of power?jug1 eg(kto rnuw3.w51z 42io1vz(2w*uo x wz

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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. Tayf-o kv1ccx x :mm0;1o do so, your powe-vy1cf0xx : 1m;om akcr output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a c9j lo7nq-hd: oonstant acceleration, the car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the c* x5eknr9 newo3y5o fr2h1+qobject weighs 90 N, how much work was done in lifting rwne+ hyx 12f9kecnq55or*o3 it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a dizpm(q*k:wz -8u v:m/rfpw d4m stance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by thevmuz(8mwq *r::d p4 wk-/fpzm 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 constanu nd*wzxpub a*(39z .ot force of 5500 N for a distance of 50.0 m. nubzwu9 *(apz o*.dx3What 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 pulledf1roj0n9 :+ zk/bfso n upward with a constant force of 5500 N for a distancz o/9bs1 jf k0rn:+nofe 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 8mit 9hb( vrjx r2h )9coime9/force of 5500 N for a distance of 50.0 m. What is the net woh9eixm 9vo89hrt2/micj(rb) rk 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 +9n)s3 vok90b j uwti1p9ku ,sbzfjq8up 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 s3h 4)zg *xxqwtlides 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 sis 3l*a yc)jnzx805 rqpzter Sarah in a sled on an icy surface (assume no friction), with a forxp y85a3c zn)rqz j0l*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 forc/azvliwq: v c3ugyz--6r h5g:e. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves fro/l ziz56: vu3v-cwr- yg gq:ham 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.e0p:g2 m8ra 3t xd9bgc The graph in Fig. 6-1 shows the force versus the object's position. Finacmted:8g 09gb 3rxp 2d 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 i do5x4hnb hm3-n Fig. 6-1 shows the force versus the object's position. Find the work done wdhx -h54o3 bnmhen 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. The0pv)/ct y rw0wo*n y;0 ejzy7s graph in Fig. 6-1 shows the force versus the object's posztp7wn )c;w0/vjr0 sy o*ey0yition. 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 20aof9n1hwdskof04 + ) . t+ynuq0 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the c9ktfs+u+ )nfoa nwdoq. h4y 01art?

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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-/bqe;t s,4 zezkg cart (initially at rest) across a 10 m level surface. What is the final speed of the e,; q 4b/szztecart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required toruk+jyhvu )2f;+ mh6br c f(g7 stop the f;6vf)h7gcy +h rujrm+k(2bu 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 initial su30/c.xtxgt ly moving at 25 m/s, what distance is requ3us 0 cgx./xttired to 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 dabw0ahrle+ j d,sint4/n0c rx(r, ji ;(rt. It is cocked by exerting a force of 20 N t0jjah (; i ces4ri,x0/n+dr(lb,wnrover 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 80c3 ud6+ dgaj9s 7usn/h N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart startsu cu7js3gsa/n9+ 6hdd 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 thxt;r4x-8 o 7b+fddgfqc5a i/ ee hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the ic xf4 5gqo-fae ; x7t/ddrb8+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 abllew2k4)z;2c7n yqt h / bc(qqove a floor to a height of 13.0 m above the floor. What is the c2 7bnewlhk(yzlqq4q cc )2;/thange 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 0apxqm 4q-,qb plane. The plane is 4.0 m long and rises 2.0 m. If the pq p,4mxaq-q 0blane is 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 x)zag4ua o,k0z ( 7-t1/zoug+q bgavo spring, causes the spring to stretch 2.0 cm. What is the sprzg z+-auzt/(g ao7k1ox )b4v,gau0qoing 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. Hom w4 a (nhyry8*el5vu96fgnt6 w much potential energy does it store, when stretched wel r9n* ynh 6 a64fvy8ugm5t(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 rzd.aye9 7q,k ss:l1sinitially uncompressed spring with a spr:less9d zsr7. qy 1a,king constant 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 2lbt v6 nu 6zxw ;lh0eauq613qstretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? ln3tv6 z ae6xb ;ul62 qwqu10h(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 init cci 7v fhqyljcl ,04up.d.y9,ially compressed by 3.0 cm. How much work is required to compress the spring an d,cl 7iyv cq9 4jul.c,.y0ph fadditional 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 frcinu8-wis6d,u i b0x ,om the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect fricti,0wx- ,d8iscni 6i ubuon.)

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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 with an dieeix 5. r p lmm10cdb/(9bpuht74b:initial speed of 4.0 m/s. Neglecting friction, how fast will s4(5:d 01 pi/ bm.xbme97 uclerdibthphe 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 frictimx3f2aw 3)dx r+c :lbeonless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plan+3mac b)l3de:frx2 wx e?

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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 mr/8t xqgtg ty,.8gi*t above the floor, its potential energy exactly equals its kinet8 gt*gt/ 8.ttq,rx ygiic 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 10 N, blastsmp je n y9+b)mfu(9ru4 straight up from ground level with a kinetic energy of 40 J. At the exactf y9rj) mb9 peuu(4+mn 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 groc04wgbwh*3osjpq+ quye9*w n*73ued und with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch poi3pbh n eu04wdoqy g+* c3 suj*9*ewwq7nt, 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 sta r(v;j;5jrb)os :hfqhrts 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 the next slope, which is 30 m above the bottom of the djr:5oj) h;hvfq s;(brip?


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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 point5 bey 1sh3w,jc 45 m above the bottoms y,beh5c w13j 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 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 of a dip witho7w7k em)r7jy16yyrjjk h+,x a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller c1ym ,xo7 j jw7)kjehyrk+r7y6oaster 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 thek 99jk t t;0d(f0sqexd 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 lengthqaam nz-:t55xps2uosh*4z + t 50 cm is pulled 30 cm away from the vertical axis and released from rest. What wilm zax+4ps5 q2-sz:tthao* u5nl 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 hits an initially uncomprb nig )9jvp20vessed horizontal spring with spring constantv2gvnb ij 0p)9 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 tg :n6-pg k2fxgo stop for a red light. What wopxg6:2fnkg g-rk 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 )*.gta mx (jtms/k 7lqum3-ktn5y 7vris 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide m uy7na 7tvr(53qtm-l* .skmk)jx / tgbefore 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 6jt 6j wcbyu(-has 24 J of kinetic energy. The frictyu c (6jw6jtb-ion 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 f;k5r: wks9 68ro bwkzsoczd:1y 6m(son a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance ofz:r6by;c r8f1o:5k9s6( w ksm d woskz 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 a f4d75 my b,o*vnmh4925ryem/zyyby slope. If the work done by b5y9hey dmym5b,*ov 4afz7yym4/ rn 2 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 z ,*r)lfqp kf/up an inclined plane. The plane is 4.0 m long and rises fzp)/f rlk*q,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 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 atl;1zaa 5q sfe1x( pjt3 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 af11pe5staz(; xla3 qjfter 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 fro. fcda,4hofh)3lp/ rdm a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction d)o. acdrf4/h,3plf hacts 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 us0x * an:8ga z+jwvwla0ing energy when he runs up a flight of stairs 10.0-m w0lzj8v: *ag 0xwn+aahigh, 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 a constant5. a a l3zo-bj (l8kydg0(spap velocity of 5.0 m/s. What power mustg5 spz 3k-8 yabodal0 j(a.p(l be delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy *v c2w:.ya0q9v62j3e1 vbof mkkgm s d*mk4goare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 7ommo:v3 2vv1g k 6*m fskea0w4 2jygk9qbd *c.46 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 vhq-ff i 4s,6ob*ms2vs her foot push woqf4,ifmv 62sv hbs*- ith 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 1dyld3u:zi ei-v3l )xfrom 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746)1ve 3du:dilyi3l- xz W)

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