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习题练习：Physics Unit6: Work and Energy
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://tiku.one/test60.html
 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct un..vgsu- kod:,nz;ux y +pqc.mit of 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 a sys 5h,yoy9p4 laxous/ *95obzm ctem 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 of wo7- ccadi* ura5rk you iu5 c-ac*da 7rdo

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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 k-pmt+tm6u8n1v h- ef is being held there. How much work is beinftme+ h6v uk 8m-nt-1pg 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 at a constant velocit63 2uh 3mucfk7ulb*pu y carrying a 10-N object, the amoulp2uu* h ukf3c736mbunt of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m the ifn jy*;e-+ms1xdj (uz.m9do n returned to its original position. If the total wed n;moe(sj d yfzx91-u*.ji+m ight 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 ws(p,j7:zl v/(hoo;8 gus9,wq xmaznea9wo+rork 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 6yj9rus2tbu nd 0-w6kof the work done by gravity while the ball goes up with the sign of the work done by gravity whi0rbk- du6ns9t yj uw62le 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 pok k e5ouz. maf qu9/7b*(n3qehsition (F vs. x) graph, representsz3n.hkfe m*ka/7qu (q9 beou5

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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. n 2tr*tk7qd gwjfa88 the work done by the force Fgqt n t8*j8w d27afrk.?

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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 omo 5 vwfubm,l ;ye3-:-qu(ovenergy

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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 obsa tut6*gf1 /nject'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 i qz6ary0ap,/f*dp0aan 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 moving at twiceeu40yo q+mp 0c+7 zjgt the speed of the car. Which statement is truee0 cy 0+ 7qutojg+pz4m 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 haah 3p2yxgjay:a;0cp0 s half the mass of car K. The kinetic energy of c:ap00jpa xc ;g 32yyahar 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 half4kzub+ensh12 b6z1f d of its original speed. What is +dheu1kf 42sbnb zz16 the ratio of the 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 m/s and a pebbl ds ,ruoncby poykby-;9++*.i e 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 -ybr ioyukosn +*y,+b9dc.p;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 wim/fc2jl yhqb- o9 s:0cth speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s/ ych- 2o:9lmf qb0cjs. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of yo/0 lgsl3zdkox dv.l vp9 p8n u(jpm,-+ur car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what dist pupl.9 -x+sn/olvd3 (vzd 0jpklg,m8 ance 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 1 folw63jjqzz/yn275 :i lv( fhqf-ctelliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic enerv2q(/z l:of fynw -fzt75 j3h6j1qlic gy?

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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 principle.*crsi gm0eoi. i2gi 91p(7cpq
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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 ne6knp-x,xo s a9gative 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(*z/ l:0deoqnuiej.nq t nb2 +z (s(dnjf)he.om rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy on d:qo+tqe./el2 sznj. *zbe (j(hi)0ufn (ndf 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 stretch 5.0tr jw;)abe1 c6 cm. If another 0.200-kg mass is added c ;tar6jw) e1bto 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 en0husgkmthc.:j:n )3 tb7zr,((kmeqpergy 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 kiywiw+/a 8o7nj1ad6k8pzp )a tree. Compare its kinetic energy K, to its potential energy 8 w /kiipwdyzap 6jo 1ank)87+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 vcd, sx(j/n d,a car driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy obx lq j2-vctfj zy)9e,(ject are sliding with equal speeds along a level frictionless surface. The f9-zv xcjlyj,2tq)e(y 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 f r x ovhyp/2m*.2ozd+$m_{1}$ 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 energy for conserv6xl kzz 53:18ns4 ip8, dzlw;af.bcc ft hez;iative forces,1dz6z8c hl;xi.p t8 wfl3 k5ei:c4 zzb san;f.
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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 the air (air friction is p+w(mhj,b- 2lws :qu grqt6o3jresent), to the ground belo:r2( u tjq,-h36wj+wgmslob qw. 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. Do noxwu-t 9a:qb.gt6;hn yt ignore air resistance. How much gravitational potent6yn:hu- qt xwa. gt;9bial 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 gravitational potentibb3pg f fows/ka+q7 )wq6j 407oaa o)qal energy. Do not ignore air resistance. How much k) q/kfqq a a+ ob)7w o36awfo0jpbg74sinetic 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 enr55 area-s jk(ergy.
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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 isk4r0px:p8 +bu vkhgw x8e 07qf

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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 uuab l) 5 nt9)ynqjmr5b/r4s j0nits?

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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 k2,pac0 e(1 ip v m9toqvwx1)nnot 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, you did 3 times the work in one-third the /drwdh tc(mbgv7x68k; -shb6 time. To do so, your p/ gdc7vm6bswhrkh ;-xtb (d86 ower 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 consta,1qb8znp9 wwy9j m q/lrgva,o f6. a.bnt 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 th5/ jjkr- rxtb1e object weighs 90 N, how much work was done in li- krrj5/1 xtbjfting 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 distance of(em vsssi*8q2 1.0 m, at a constant velocity of 0q8imsv(es 2 *s.50 m/s. What is 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 xoyu(vl*d4u ym9hc1 4upward with a constant force of 5500 N for a distance of 50.0 m. What is the wor*y9yumlh1dvc4 o ( u4xk 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 5500 N for a distaf a19nbha;c4rnce of 50.0 1aa 94rcfnhb;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 u:xzb w8qaxq+- pward with a constant force of 5500 N for a distance of 50.0 m. Whataqb:xxzw8 +q- 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 pulledz ioo4g3.*riafl .o304z 5pu w czyd)k 6.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit ,di:x 1m 4opl k0knf:fslides 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 anafzqq,u3 ;+(w kvm6wi0ps i5,gzvv( o icy surface (assume no friction), with v,aig 5(vi6zp3km;oq, (sqwvzw u0f +a force 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 in Fig. 64v 66h 6 erfsnsm4w3cd-1 shows the force versus thn4erds cv6 4ws f3h6m6e 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 dire69. kfrh u*j xt+ti4xkction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the oh jx ir*6f94k.ttx+ku bject 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 fme0h. 5t5paul-n hxhxw/bi34 orce. The graph in Fig. 6-1 shows the force versus th.hitxme b304p/ uhx 5h5-wlane object's 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 graph in Fig. 6-)lu4 j//9 uuds4 xtcil1 shows the force vs9i)t 4/ ljulu/x4ud cersus the object'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 (initia rg5adebxca( n-. 2n*vlly at rest) across a 10 m level surface. Wha5.*gea2b n na (xv-cdrt 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 52ky4cz a4j ojv/9iqt;5-kg cart (initially at rest) across a 10 m level sutzq/jikcvy 4 4ao9 2j;rface. 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 a3rr8 mm/yjjbwa (n,iq, y;,pz speed of 5.0 m/s. How much work is required to stop thrnj m/,;iz, rpqwm, ayy(8jb3e 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 distance is rerkd;68rgj7b h quired to stop a car b7 g6 8d;rrjhkmoving 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 prklbu vm67edby, wi7.*q p /ei3opels a 10-g dart. It is cocked by exerting a force of 20 N over a distance oqle d k/viubm *b6p .y7ie37,wf 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 com5vvj(fq ;qr1al q1q. tponent of 60 N. The force is applied to a box which rests on a level frictionless floor. ;vfj1q.v1 l tq5qaqr( 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 )k+e4ylz nlg ;f7nat:shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s.+4lng:;7l )ekntay zf It penetrates 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 m5 wo h5r6xzff,b)e spwn(v-j 4 above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentijp(se)b6z wrfx4vh5 nf-5o,w al 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 gz)at . j8av-nup an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is fjgza.t)v n-a8 rictionless, 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 ondohex ck:yu 4u6j0q ::to a spring, causes the spring to stretch 2.0 cm. What is the spring conso:ckhd4 x:u6e q0j :yutant?

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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 splub1u l6gr r1j5: z2spring constant of 60 N/m. How much potential energy does it store, when stretchedsbgj:165 z2llpuu 1rr 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 uncomprc 3eedl(lp :hiy +vhh) 9bbz,7essed spring with a spring constant of 25 b3hi: plhh9ydc() vebez7+l, N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/mq9: gz d,pi o6oei-ne( from x = 0.20 m to 0.2i,e9 e-zionod:gp (q65 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 constantsg-cydy 5u48j of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an addition4- gy8uj5d cysal 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 ofh/i 3sj+ 5ubtf a 50-m high slope. What is the speed of3i5f+tsb h/uj the slier 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 qx 3g*)yksg5rd2k-dov, ltt(s9n i c.of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevyt2sl3qkionrxs*gd(t 5k d. ),9g- cvation?

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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 frictus wb/bs1k6 e1 gwm 4)8lyst8hionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height swu8t6swk1gh1/ bm )b8esly 4of 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. When it is 0.70 m abovev +6xsi 84*brrj;*4 yvx5xnu0z bi kxu the floor, its potential energy exactly equals its kinetic energy. Hi 0zjx b6 nbxxv5kv4 r8r+;uuiy**4 xsow 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, blasts straight up from ground l8b.f ,c;n w, voedwb7revel with a kinetic energy of 40 J. At the exact top of iwv fr,o d .87,n;bcwbets 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 evl wf( ff2fj8bn;-lgb5qf/4 i nergy of 220 J. At the highest point in its trajectory, its kinetic energy is 1 l8l- ffbgib /4;jnfqvfw(f5220 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 m above the bottom of a dr3ln m f-5/x( 8nglftgip (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 the5gmtf8nrfl3 / -xl(gn 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 point 45 m above the botp3z i7gfyoopoby7 12ts:0in lvvs8/5 tom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastsvbo yt 7732g1y oo i8:pvn/zl5p0ifs er 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 pshbol 3 k58 yze,.c7vurua)ci1e3 a,vu+w*o aoint 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, whi+ .bksah,8w 7 ri*ccau l)3e,u o5u3veza1oyvch is 45 m above the bottom of the dip?


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78#
 
  What is the minimum spe+ n(qe i5(vx7i5x mgksed of 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 away fromkqw,sp. tz d+: the vertical axis and released from rest. What will be its spezd:sk p.w,+q ted 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 uncompressed horizo:ezq)aht 9 m;ia qx(p1w)uwh5ntal spring with spring co;mw(ut zp ih5)qhw1 :aa9x q)enstant 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 v69pybq65g.m ixroue p :eh3 66paz-l2000 kg car to stop for a red light. What work is done by the friction force againsto5l-p eb3 v6rh 6 p 9a66zxpuie:gym.q 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-k ( 6meog25i3 yj yjg7 lgudru:h);v,ekg object and a horizontal surface is 50.0 N. If the initial speed of the object i2 mk g6h,yr (g5;y:j3edeuv7)jgu oil s 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 roug a(e y 1xeu.d,kb yc5 6vvza-(hth-.qrh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.achh,5yez.r( a.-y-v be 1kux(qv6 td50 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 applieb rtuiu/d83ogi f/(76u(t:3 ek hssil d horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic frict u ibt7ui uefhr 8/:(/dgl6t3so3k(is ion 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 res3ab y(rn wyrd ( qx9r3.vf,-cit from the top of a 50-m high slope. If the work done by frict(axwbr9(r,yfrv.q y 3cid- n3 ion 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.mg, e8h:od w/e82yohenrv* +h n2z iu80 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 thn2 er v ue,/ heno+md8i*y8g2oh:8zhwe 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 fr;1zwov)p ial + sux3,som rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass andpsz+3l1wo,sxi uv ; a) 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 strike(7uj.mznyz-u* sn2nis the ground with a velocity of 7.00 m/s. -ui2 y z7.nm(*nnujzs 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-k o (jnz:te/a,xg boy using energy when he runs up a flight of stairs 10 jx(z/a :ent,o.0-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a consk3pd oub f+uvo a/.1.dtant velocity of 5.0 m/s. What power muk o.apuf1+odu3b/v. d st 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 are used by a 1.0 hs iw8* 2wfrf.1i7qtbk p motor that runs for 1.0 hr? (1 hp = 746 wikwsi2.r* b1qtf87 fW)

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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( ;zh hbdf9vtw0h)5c u 500 W while riding. How much force does her foot push with when she is;u(whfzhdvc )htb950 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 frm h 5 smstdu43r4:jn)vom 0 to 25 m/s in 7.0 s. What is the average power delivered b s3jm4):s5und v4h rtmy the engine? (1 hp = 746 W)

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