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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test60.html
 作者: physics  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 unit of work expressed inm )y tik; b3shjw2e:pq tin(-ym7n,2 w 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 system if the4hxus)y -6u,hxqnlb ywx:/6 t re 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 workzn/(f -b;cha3+ 3tbsaeb og8t you dc 3-zaebogt;h b3 8fb+n/as( to

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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 7*gnvi d)s- guand is being held there. How much work is being done in holding the box in tsu7- dnv gg)i*his 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 velocit(0 bd0fxmae*f y carrying a 10-N object fmbex0d*fa( 0, the amount 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 then ;gwt frj11/rtreturned to its original position. If the tow rtg; rt/f11jtal 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 obzh*yn:n;;y qzject?

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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. C ;qfwck pz 8v* v mr(ecxql.14(bs;+uvompare the sign of the work done by gravity while the 14uzvsp+c*c(k v q;(b mw.evq8l x;rf ball goes up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, repw l:07sio0 1,cc 6nap o aeuqj0e*z(adresentsd(az06 s,pn*a qwe jc 0oeuc1i :07loa

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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/dvpr0p1ox s* position (F vs. x), what represents the work done by to/1 rxp s*0pdvhe 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 obj cdmz-txs 79h)ect'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 negat.(8typrap hd05lvo 6aive, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, th a gz1 un:w;jpu1z:uk3en 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 tw1rrho qmzdj;etc* 6+ 2ice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of dtoc1 6 hz2;*mjre+qrthe 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 car3e1aird ep aj52 m--st K. The kinetic energy of car J, compared t1pt 3eesma2-5irj - dao 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 isp l,yi92tudy(t 6zx8toqds895kn *and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energu,tq9pdyz 8t5olt8siik2 yn6* 9sd x(y?

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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 movyl)l0ng(m n2xwa/n;q ) ;pyfying at a speed of 5 m/s. If both objec nyx )wm)al0nfg( ply;qyn;/2 ts 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/s. A 1.0-kg mass is movid7yo5fl5u n4n1 p, wlyng with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater di uf4 1d7y5,pln ln5yowstance 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 5i 3xwci0y3hz m8: fav w).hdca certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the cafc53vx0.:hzmdy8w3 ih)aiwc r 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. Neglecting ant;sp. n1 w j3+fbud4exy friction effects, what hapb.1e wdnj uf+sp 4;x3tpens 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 n4qz(ze8 grz:principle.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a v g.m,pxkt 19 u: jxvj6ealf5:system to have negative 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 abo8q3p m5p5mc(-aiwu1diq2:im(qpwkf ve the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to themqw c2 f8(:qmi p-dpa55k1w 3upi(m qi 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 qtqif r 9y;(e+ nf94zj-x.h4rfzro)f a spring causes it to stretch 5.0 cm. If another 0.200-kg masz4f(i+f9 fhx. 9;qtrzyjrq-f)nr o4es is added 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 uv6+w4.jj flfsystem

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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. Compar (u0it+ccrv db9za l(7e its kinetic energy K, to its potential energrlbtu09(ic+ zv 7(c day 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 n 9hu+x f .crk11srvt,9k-pehdriving 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 44xc4c bw3v zh;7ghq oare sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater hei;4c hxoqw gcz4vb43h 7ght?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses plvlhyd3 )q6u* d s i:oi4cz7:y mn5b.sx5u:h$m_{1}$ 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 ew)z2meqt avum 5kdb0a4b 0 :)j(nkm3 knergy for conservative forces2bv) qwbk3k)0mn(d0 aem :z4am 5j tku.
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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 pr.- n7dl wk29naovmj9 hesent), to the ground below. How does the kinetic energy (K) just before striking the ground cm9 l7.no kw9 v-2jadnhompare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 30 J of kinetic energy. Do not ignwf3vn+6gav 88k2xodp49h rd hore air resistance. How much gravitational potential energy did the ballh8 oa9xdhkv v2grnp d6w 83f+4 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 of9 zn;sun2zsojt m ).9fu6-quf gravitational potential energy. Do not ignore air resistance. How much ;9)zu.nmt uf26ujzoss -qnf9 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 3v jh6fu0zj3p+jg d )nof 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 isl7 b9 *d ,n )ppgalqqhe,81 vkq;fdgt3

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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 unitsbu)d/gi, f2 s2uc/ajkdada +-?

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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 dshap+;cfh7z8ui2 o4unit 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 tim/ 2v0j2r+ pl o*w;p;krdaefrme. To do so, your power output m;+ vpr2w0;kpreor2jam fl/d*ust 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 acceleration, m, fqe1w (k2i+ g1bszhthe 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 sn j l3kan)4-gthere. If the object weighs 90 N, how much work was do4) -a sg3njnlkne in lifting 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 1.0 m, at a const s0* b0ioxarn:kwc 19oant velocity of 0.50 r* 0b i wxao19on:ksc0m/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 upward with a constant force of 5500 N for a iidb(/pvnx)8 1zcy:qibp /u+ distance of 50.0 m. What is tbdncib8u y+vz /qx 1pp) ii:(/he 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 5500 5vrqd/43iqip N for a distance of 50.0 m. What is the work done by the weightv/4rqpd i3i5q 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 upwasvyfyocp : n5xpu9p6zx21i5 5 mu8ky 3rd with a constant force of 5500 N for a distance of 502ys1: 5 5u izmp3pynvkux f5o9c px6y8.0 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 6z di)* r7y0otg.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 slides 8.0 m down a ;se5m4a9fdhsv) s:in 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 c:ytdf52a*etlrcng- u: rh64 a sled on an icy surface (assume no friction), with a force of 60.0 N at re24 fh :gc rydac t*l-6nu:5tan 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 gra-l2vz nzn re-;/4enx xph in Fig. 6-1 shows the force versus the objne-z r-n 4 x2;xlzevn/ect'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 in the direction of the force. The graph in Fig. 6-1 sr /y4qz4r5g8q oard.kn n))xn l;a.h shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0/snx5 n rayq).q84.n) l4 dag ;khzrro 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.mdmt g j)+;9trk 3x+,nomha3b The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the,j mn+b kamht+ )3o;x d9tgrm3 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 thebouti/kqf/ v5ts/ 57d6xm lyq*7,pi z force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moqm *izp7ixku /l qf,/sy/7vt 5d6ot 5bves 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 ofpn+e. t o:qpwmec38x 8 200 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 c3eo8wt8 exnp.:pq+mthe 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 (init63x a06v-,a4a j*b bemdxls fbially at rest) across a 10 m level surfacjbxf0b6*la4 6 -x vam3,asdebe. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How muchfvussb- mppz u6(/ kb6*,p oj. work is required to stop the mamzvu /*s-6ppf(p.kob ,jsu 6b ss?

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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 cefjg2j yf* *fetkw9,26ex t2gar initially moving at 25 m/s, what distance is required to stop a car mot e2gtf9,j2f6fyj2**eex gw k ving 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 i)cffsk 8/p3i9j fuu xvfqd*);s cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wilus ) pd9)3f;i/jf8*qxfu vfk cl 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 80ikgn 3ziusc 2g5241bm N and a vertical component of 60 N. The force is applied to a box wcibgs1 m u2n2g4ik 53zhich 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 ha.hejd7ihxyer s7;6 i)4db0noulu b91 y, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopphui1n;7 6 db 9jeb)7sd yue4xr 0ihol.ing. 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 above ah7qd1u f, mt8g floor to a height of 1 mt,fgh udq7813.0 m above the floor. What is the change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and rho 2n dw0o7j.3c ks.d,hb.ltjises 2.0 m. If the plane is frictionless, how much worko,on730 jbc thhwd.l2sdk . .j was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to svdg5ue hlg rolt(8z f94/.zx2tretch 2.0 cm. What is the spring constanv9r(5 thgo2l.d 4z8ezglf u/ xt?

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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 ,to( fdtgezr+ ;swryd +u:kw/(p)h 1ta spring constant of 60 N/m. How much potential energy does it store, when stretched by ktyw( 1sew d:/u)h(dr zt+; rpo,tg+f 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed spring 1j zf lw76,jtxm0kagdfpm*wk7b58r, with a spring constant of 25 N/ *wwgfx7j mj8t,zka l651rk p0bm f,7dm 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/m from x = 0.23p da9-ooh9v6:y o dm 4fug*yh0 m to 0.25 m? (4yuo *a9ddh3m 6vog h9 -pofy:Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. Htkwwe: x,9:x zlsb/ (oe7b( w/phpj ;iow much work is required to compress the sp/h:e(7e;(s zbiw,t:w wjk/x pblop x9ring 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 r6p, ll vh7it;lest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? 6 v ;l,i7ptlhl(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 .9/.l c or-91sumwyo3nhkv yythe top 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 eleva m.cv-s9 9l/wkyho 3rn yoy.u1tion?

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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 fricj x bt30kn -a)/gvk(sytionless inclined plane. At the bottom, it has a speed of 9.80 m/s. Wh03-j gk/ (yasb )vxkntat 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. When it is 0.70 m above the floorxj r.eaq; clu(*t7nk( , its potential energy exactly equals its kinetic energy. Hokx.(t(ncur* l;e7 jqaw 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, weighintq-oc5p (w h,ng 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it ri-ntho q 5c(pw,se?

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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 22ze(3x *f+ztnq dvn9b30 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pz+ xven3tz9b*f 3 nq(doint, 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 dip (Sej / uo;oo+ (jtz6z*hcwe Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whj;/z6w(c j*u oohoz+tich 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 star6zm7 ayyhbzgga-qurmr*;25 h6x(h2 g ts with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed o2* 6xm h2hm-qyag gzrah6(zb7 gyu r5;f 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 withfe+vv. n3wcfei ;c74l a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the sf.w;+3v7eeci 4n fvclpeed 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 at the bottomd1mc y73 1cgi.l/uojh 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 aw t:d*cv5ih) loay from the vertical axis and released from rest. What will be its speed at the bottoh)i:lvco t5d* m 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 horizony7r8q d)/rkq wtal spring with spring constant of/)qwqk8r 7dyr $2.0 \times 10^6 \; N/m$. 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, slowvzv7o *w9 erpt19/ l6* kiqrhs j:(rufs down her 2000 kg car to stop for a red light. What work is done by the friction force againhv(rfurqs z/*k jw96 pt ir91ol7ve* :st 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 a4aqf0y:o d lg;yd a,zljo1p.( nd a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/sqdd f :l; o0.gpaz,(yljy 4oa1, 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 kinetict scg 6rd:8,9s kqn0xqy/t8dv energy. The friction forcx9c/8d6rtdyvs qtkqn 0s8: ,ge 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-km h2ycyb v2+;eg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is move hbyy+22v;ecm d 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. aimw .2,g)gprw)ml f7If the work done by fr w .w,pr2g) iml)mf7agiction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 mc ewp2a6l +ggg yu(q)j :,my(3xvdl w; long and rises 2.:+)( yw wgvly 2c6g3g,u(dxaqjme;pl0 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 ofc(j0xpdold, . 2jt*su a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the lt0d(*j,p du. j2xcso 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 the ground j(rhe- nshtjy7 :k,9grj4c + jwith a velocity of 7.00 m/s. What average force of air fricrn(s+hye c 9kjjg4rjh7, tj :-tion 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 w 3aw4ibx5nw8dd0-btx1o 7rmqhen he runs up a flight of stairs 10.0-m hi xd4nq3 bb8mo 5d7-rax 0twiw1gh, 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 constant velocki 3p. m5h90tt.ln 0e8h04c hvy lfibdity of 5.0 m/s. What power must be deliverep0nyii0c3dl0 eh .f9v.m 4lh tbh85t kd 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 hp motor th8cj *cu;2lasl at runs for 1.0 hr? (1 hp = 7l;s 2jalu* cc846 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 t-l in. ) qll,yju0)hmforce does her foot push with lliylt),j m0uq.n-)hwhen she is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the a9b/rxzhc92wi u, 99yv1grs 6um7vuk:7oqb t g verage power delivered by the engine? (1 hpgvhu 2qr967i99s:zy1xk7bbw/ ,u mg 9cvortu = 746 W)

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