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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 r( (u)j2xjw iwkq*4jq qc4wr)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 ah nfvx1hz, +0)+vpb ra 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 wall,/-h)gm a-o)bhihy z, u the amount of work you d oa/bz,hu)hm yh-i-g)o

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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 vert3x0eea. p49o *dwrual4rw v. hically and is being held there. How much work is being done in holding the box in this p po ed4. re390wlruhx4*w.aavosition?

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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(bp1bq(indi2a,1mt w at a constant velocity carrying a 10-N object, the amount of work you ((m 2pdnq,iibt11awbdo 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 returned to its origi ww9a19yqwh) rnal position. If the totalr )whyaq9 w91w 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 objg.j ayz1lw1 -wect do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Comps v elqz5g*m7h2s;m9vnj n;r4are the sign of the work done by gravity while the ball goes up with the sign of the sn qlj; v ; gezr5*s4vm9m27nhwork 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 positio;1z i uz5kk/to3qy/ 1xt;s+fdksde/d n (F vs. x) graph, represents+eo/d 3t /dx5k1uk/dzfk;zs s1;qy it

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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 poso2fh6 ck2hdhgh( s/e 4q,abe8ition (F vs. x), what represents the work done by ts8 6oe2k,gqhhh/bfh24e ( dc ahe 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 53cfkk,l*hakwb (. nv positive, 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 ,x5gx g+kpox tbzm (-.on an object is negative, 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 done9;3iv,-m9 bzewp81nz i .qnasbu -spz 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 isbk03r0a+i g0x 8yabh j moving at twice the speed of the car. Which statement is true about8i0h +r3baa 0kx0gby j 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, an46bpr vswf 6z0d car J has half the mass of car K. The kinetic energy of car J4sw pr6fv 6zb0, 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 speednq w0pp jjm00+. What is the ratio of the final kinetic en jpp00 +j0wmnqergy 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 pebble *pks,m(na a i9z4.tztxd gri(m;n(o2 is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the k2nz(4 (rad*opxnit zt(.gm9 mi ,s;a 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 movit5 045sqrd r mzt4:0(kpwt qbwng with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whic440rttkb5wd5pmt0 rq q(w s:zh 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 panic, and hwqy;pj 5d99nt wzfg *++4:u:xmo jyz skid a certain distance on a straight, level road. If you had been +nu4m:;fwp9y9d5q* ojw + zzhgtjxy: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 *jq:t9.f uitof2yqt;t50 ub)wuict 5w8d p0a the Sun in an elliptical orbit. Neglecting any friction t :9y.q ijwutw5pt08bf; c0*u2 tuodia tf q5)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 princozrb1oov+3zfgm-81 n 9e k-lciple.
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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 eni7y7(ace xfi h,eb2tzx8mdzc02r;dxxg .a;4 ergy?

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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 second objectncg;*1xaq(p/kwu bzjt zk* 5: with four times the mass of the first if released from the same height. The potential energy of the second object com/5( *c1n gzkk;a tzup:wxqj b*pared 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 cau v)m b44x,qk)x tf)rhxses it to stretch 5.0 cm. If another )fv,h 4)b)mq rkx xxt40.200-kg mass 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 ezf8 vt1y pc 5,-ad t3f*wt8-imfld 1janergy 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 cz+y7z5, x1)ycyauf lits kinetic energy K, to its potential energy Uzf+c c7ya) u51x,yl zy.

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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 drin1oqgm76rs q(p8 y n:kving 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 objeuyf a 1a(vcxn m*aowu e 7c6c/z/no371ct are sliding with equal speeds along a level frictionless surface. They both slide up the same f a/3 mz7ofey1x* vn7cawc1n(/ao ucu6rictionless 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 ,fevjc9rm nxtn-0.mdo 7f +( f$m_{1}$ 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;i y+eac nxi n(;v*l)f energy for conservative forces*i+() lcnv;fn eax;iy .
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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 o-0hdoi /scd)b3n- 4qxi2anc1 ofj*z/z/ w vp if a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to --adi /i4p 3*2o/qbnwhcfnos d0 jzzvic)x/1 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 ene; cd1vig4l-8s2 j vqwrrgy. Do not ignore air resistance. How much gravitational q8v 2jl;riw- g cs14dvpotential 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 gravitationw mw1,/ic:be hal potential energy. Do nwb ,hwc:m1/ ieot ignore air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation o8uasa1h oae9ly )ye27w:zu848e ncf tf 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 is+bqqs)l6gnz ml ;*y893h zxon

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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 powouam5 (py*e f,er 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 av;, b3-lsfrjw 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, youu,fp4;0+w9xez4 ytl wa. ynmc did 3 times the work in one-third the time. To do so, your power outpuwmc9 y4peun+ 0f zyt;4wx a.,lt 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 acceleration, the ca2jsjz. q +6utxr'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. han 4:e zi;6fk If the object weighs 90 N, how much work was done in liftin 4fik6zha;: eng 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 constanv /c+qp5h7d;vqh t 7 u)ljdsq*t velocity of 0.50 m/s. What is the work done by the weight of the ;uq)h t7+pcsj* dldqv 5/hq7vbook?

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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 con f+/*ce6 w-6jfspgatrstant force of 5500 N for a distance of 50.0 m. What is the work done by t wt-c jrgse a6p*+f/f6he 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 distamv1l, (;2owp xq2bcaj nce of 50.0 m. What is the work done by the weight of the v;xwc(1j2pbq, loma2 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 c0i1 k6db3cu/1 z bawkuonstant force of 5500 N for a distancc bb1uza wkik10/3u6 de of 50.0 m. What is the net work done on the elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up along a..m u 47qnj6k bt2ctso $37^{\circ}$ 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 ny r,b4gq7og6down 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 (ass oga.4, gk3 +)jot2dv t7)b ohz(ftksdume no friction), with a force of 60.0 N at an angle . zdghg)f2ksvto +dt7(3 o tk)4jba,oof $37^{\circ}$ 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 d sc,iznifxvee;ox 2*zm+,+ /force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obje+ ee,d+ni*x, ;f2mviszzc ox/ct 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 direction of the force. The graph in Fig(xm a( xs9a(xunjd0d 2. 6-1 shows the force versus thxasm0x9xn2(j ((a udd e object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig.n7nu 3ncfsrni o.r3j l--9s,y 6-1 shows the force versus the object's position. Finorl sf-3nn9jc-r3.i u,sn7ynd 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.n ovg;p 4 2)xewvh. -s 9)3do1mt lal1a4ndldw The graph in Fig. 6-1 shows the fod lhs9 aa.n -dn tov 2e1vld;x)l4gp34 1wowm)rce versus 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 (ighu( df;h-( ntnitially at rest) across a 10 m level surface. What is the finalh;h f(n-( dtgu 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 at renjk7(e3ot--rfhd ut. st) across a 10 m level surface. What (j r7-ohut ndtk.e3f -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 movi,q iacg (3*u,alsk,-jo5oskeng with a speed of 5.0 m/s. How much work is required to sto*asj, (kqc3-l i gko5u,aoe,sp the 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 distanch dy1bz d7 5gz1rv.ih0e is required to stop a car movirz5vd0z1dh.h1 7gi b yng 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 byw aelt ,- ,swj5ie-bp: exerting a force of 20 N over a distance of 5.0 cew5e paw,btj - s-l:,im. 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 vertic l8 5jn3r4npaa m:p/w ,y9olyzal component of 60 N. The force is applied to a box which rests on a levell a5l43jw8 anm/p:z nypy r,o9 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 horizontallyd)+-( hlw4nxmjzkku/ into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average h mj4+)zkk wxlu d/(n-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 a floor to a h9nwhw*hoxhx6lv9 0 r 3eight of 13.0 m above the floor. What is the change in gravitational pxhwl 9x0 9*3wnrohh6v otential 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 mx0aloa6wk2 o6hj z 0v1*ph0f n long and rises 2.0 m. If the plane is frictionless, how much work was done byfhvp n6w0* o1zkl6a jo02a x0h 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 stretcnx)f*w ,ljch 4 f:ao+jh 2.0 cm. What is the spring c j n oa4+)jx*fh:flw,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. How me et0mriw;f+;,,x gfmuch potential energy does it store, when s w,fm;rieemtxf, 0;+ gtretched 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 adtm-q d9h3b 9i.h:df initially uncompressed spring with a spring constant of 25 N/m by 10 cm.h d.d hq3-idf9m ab9:t

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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 sprin smo5a;5iurrhx,5qq5fh4l 9 q g constant 40 N/m from x = 0.20 m to 0.2l5 or5qx 4h9 qu5,5hfisra;mq5 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 cok9m v,9tca5z9o/ah2l4zuwz d nstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring a945uz9 z o2/aazwc vht,9dk mln 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 frokwv )lql*)ij4 ne xo31m the top of a 50-m high slope. What is the speed of the slier on r13*e)4 knjl lio)vwxq eaching 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 with an initial speemf ,pt6o(lux +d of 4.0 m/s. Neglecting friction, how fast will she be moving after dropp plfxt6,(uo+m ing 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plx) tnt(n5r(i o mvxu+9- 7qhmoane. At the bottom, it has a speed of 9.80n9o+oxv()5m h u7tn x(t-mrqi 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 o -;26wi dk+tttu8ph9o97 xck*wedzl the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast w-k*7d t69loo pc8iwu;29 ezhtt d kx+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, weighingie5v*gmq1c5 jgi*4f t 10 N, blasts straight up from ground level with a kinetic energy of mvi4e qggi jftc5** 5140 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a x1:vca-cyk scg9tv,mb ;gq77m v+8 dqkinetic 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 poinkbctcv; qd y- +vgxm:a,9q sv1m7cg87t, 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 pointagb6)q(nxd2 x2ikzy xd8 +x)oskz 7s7 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 bottk(+q)sx7) a8x2o 6 xxnd kzgzd2bi7 ysom 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 s.2 3ig xaza*mepeed 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 of the roller coaster at the top of the next slope, which is 30 m above the beai3. 2*gzxam ottom 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 4(tjw5c 2kao(q1ra2h f8w xivmwih)v be16u 3a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller ck5xrvvm8b2jc1(432( q 1wu) a tafh wie6hoi woaster 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 bottom of its swing (p .l yhu :r0v1vw+au6ah,3rms koint

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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 gj9n seq *yopme3v; -*jm2w+i 30 cm away from the vertical axis and released fro;e *oqmpm*93i w2gvjjey+- snm rest. What will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits jz1isjq)eig* d)c)-j an initially uncompressed horizontal spring with gz*1 d)jj)jsq-i)ice spring 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 2000gevg7 l5*tw5q.:nzob 2hb : xm kg car to stop for a red light. What work is don:zqglbte5bg.h 2* xvn 7mo5w :e 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 anai7pwsvke: p.dyx8 9c*uld-6 d a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide bef-8yua6lp9:w sc7 dei vkxd.p*ore 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 surftrqpx-,z yv. .ace. It has 24 J of kinetic energy. The friction force on it is a constant 0.50pqvy. x,-. trz 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 b7i awzsj4f41 to a 2.0-kg mass on a level surface. The coefficient of kineajz 4w4bf7is 1tic friction 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 topwcm/ czuhok9-24g.jz *py 4o e of a 50-m high slope. If the work done by frict9 coouwy p2h.zg4j/ *em-z 4ckion 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 inbl06gd2o p+ebc +vpw4,cfm z 5clined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction forceec, b64m vpd2+copfb 5+g0 lwz 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 thevw) y9 4l:uuu u2hx5 7 i)..qmglnkpus top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the m )us7kulwnpuh. .qu ilmg) y95:x42vu ass 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 droppe) qs.q3q7adu sd from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it qs).dq3u7 qsafalls?

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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 hwtmp77b0k0o+ mnw)s using energy when he runs up a flight of stairs 10 b+0wtp s7o 0)m7mnkwh.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 constant vp-*f jy m8s:e-yj/ ruyelocity of 5.0 m/s. What power must be delivered to the object byp8/y* rjmyjye-us- :f 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 useo2g0vdmze12u 9u v3uud by a 1.0 hp motor that runs for 1.0 hr? (1 hp =o2guv0 zdu 29e vu13um 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 ng7z c xzg9 +a)p-19dczh(rxpwhile riding. How much force does her foot push with when she is traveling at 8.rx +c dn9c)hg(pxg7za 9 z1z-p0 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 accelerateshjrlpa 48+rr 1 from 0 to 25 m/s in 7.0 s. What is the average power deliveredl h4r8jp1ar r+ by the engine? (1 hp = 746 W)

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