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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 w7u 0s7 km/ov6/uqh7h5k adltcork 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 system if ther0v ct89 evfmkm5:/d qze 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 amo3 us77x*hf/9oyfpen kv:* iekunt of work yos*nkvfyo: h p*7/ue3i7fk 9xeu 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 lifted3dpvkqan/.* 8 c)rr;pp :cwhs 2.0 m vertically and is being held there. How much work is being done in holding the box in thi;c:3cq)k./pdr8 * apnpwsv r hs position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity carrying a 1 c.r;8dc.rdx;+z (c dkiyjoz)t6 2kxt0-N object, the amount of work you do i;8kdtc;tczd (ydor 2.rj kx+xz) .ic6s

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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 vertical*q iwxc7v,0bwl o.n,f ly 3.0 m then returned to its original position. If the total wex v q.o*lwb0,, icw7fnight 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 object;utzbw5+eqk+ ?

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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 th mz2x680zb* pzmtr2 kne sign of the work done by gravity while the ball goes up with the sign of the work done b z tx2r26*z0k8bzpm nmy 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 curr3dcs ov ref-m ob)s/nm y3/wl 63e4f4ve, on a Force versus position (F vs. x) graph, represents 33/vec-lmo/bf o s34fdwn s 4myr)6er

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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 represen (pr5r( emhbh0ts the work done by the force0(ph rhm b(re5 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 pokz8pps,/hz mf7nc d07d/5cv4w ah *lisitive, 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 obje 6it1e.vfxo+.7 :vnv+y ztrjnct'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, th6 k1*kwf +va vai.eg,nen 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 a4. lk*hen neg5vv3 8n8 frr2jms much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared tom.*4khnerflg 2n838ve vjn5r 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 carxf5*mtpdq9+g J has half the mass of car K. The kinetic energy of car J, comp dg*pfm+q5x t9ared 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 spev )n3juoixqa4, )7 4kmr z,caeed. What is the ratio of the final knu e ,i4)cr34zm)k7avoa ,jxq inetic 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 pebbmcdvp) bl.86 lle is moving at a speed of 5 m/s. If both objects have thevl )m8bl6d.cp 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 massoxo:hhp6 xtq m -;eegq3a* 84 ,s,wqhihm-2yh is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and areqh;mmg 3wo hh4h2 -ha8 *x pixo,sy ,q6t-q:ee 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 your car inkn1jol13tb8d6v8dhj c* j( da a panic, and skid a certain distance on a straight, level road. If you had been trkt1o* 1(a d3j8dcv6n jjb 8dlhaveling twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Su i) o;tz(ucy q908dzhjn in an elliptical orbit. Neglecting any f;cyzt9odhj (iqu z 0)8riction 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 princi/(ek /qdjr+d .djhjfh5x3 s t0ple.
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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 s/ kfg2-rh hmm1;5 fzp9 .9ykbwd*lrhxystem 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 above the ground. A second objectn9 dmywb)nk49 with four times the mass of the first if released from the same height. Tbw9mnk9)ydn 4he potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a springij1o 3d* :.a/ompwwn l causes it to stretch 5.0 cm. If another 0.20 nwojpiwm3 1*/l. da:o0-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 energy0g)sgk64 evy f fz6z-p of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K,5+*sggby h mj0 to its potential energy ggb0ms5+*hjy 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 driving up a hill.1nuhc d 1 ef/cj1g*n/f

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object an)sc/ ixz jef32flfz ,(d a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to afl/ze s,czj23 )(ff xi 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 ;rdspr /a.,)gem7uu v$m_{1}$ 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 conservat2ww bug jl)n0bej2y:1ion of mechanical energy for conservative forces.)1b j nb:g2wyl2wju0e
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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 (aip) ob4 :9asfxsr friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top ofp )x9a4 ss:bof 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 diso1 z 6g c-gqa-*o7ihywtance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential enerc6gza-oywg *1hq- oi7gy 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 gravitatf9t( vrbisc4*hf-1nf / mkm.uional potential energy. Do not ignore air resistance. How much kinetic 9-nmfc/* (sv .rh4mtu1k b ffienergy 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 energycaged9s+p20tm j ; k 1,baxe7b.
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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 isc -1lph ;:7plhyf sn(k

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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-o0q1ld ch 8pixcqt34 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, whic.v:zt5zqd y 1jh is not 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 3r7cjzo jjx-p1a+ ,xa 1 times the work in one-third the time. To do so, your power-c1 j1o axz ja,pxrj+7 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 constant acceleratio1 +7nuyibwe.::n r d5/l qoxam0 ,odqmis.9m rn, 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-q lu:rg49z:plvk 7vi held there. If the object weighs 90 N, how much work was done in lifting vz qkplvr:9 7ul :i-g4it?

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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 boovi3 bm-p(y+k 5lfs n9euf;m-p k up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. ; v-u3i sk+-nppmf5bym (9elfWhat 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 o 6l ksgmy,/z dgj,+.xltnd**bf 5500 N for a distance of 50.0 m. What is the work done by the 5500mdkx,, ll+.gd*jyz* /tsg6nb 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 distan6af(21g9: +opvyhgyigi ltv5ce of 50.0 m. What is the workfg 1 ip+htl6v9 :ag2( ygiyo5v done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 Nbr; vlch3 ,d5t xiy3h) for a distance of 50.0 m. What is the net worklybd3 r;,vx) h5i3 htc 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 ujsj2-s1qpd 4npz2 38bhan u6 xp 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 ramp, incling la xyiy61do4gneg53 pn.o 4yi+ 1(ufed 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 S mtq 49d 1wn996vjqpwgarah in a sled on an icy surface (assume no friction), with a fotj qmp d916n94wwq9v grce 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 Figoc2bp ncmd)o*o5 rlz1al9o/h+ 7c p( ibog:w 3. 6-1 shows the force versus the object's positionc7/io+rahcoc g(o oo)dp l93nb *:z1m lp 5w2b. 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 direction of the force. The graph in F lgxzdv: ;vkly)tyeu7ot3 i i1 eq(a:45mc-r,ig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0xzt1v m,l 7i:3y :va 4ioltug-;(ce5)qekryd 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. Th+aomi+/dr:ri e graph in Fig. 6-1 shows the force versus the object's:r+r oda+iim/ 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 d)-* kpdm.agx +u ey*lin Fig. 6-1 shows the force versus the object's position. Find the work done when-.gm+xe pd**ykl )u ad 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, r x+5f0srlyh (initially at rest) across a 10 m level surface. What is the final kinetic ene fy,hsx5r0r +lrgy 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 mopyo;ec,p0 4hjbbi5 4+ei-e6 v4 o riecve a 55-kg cart (initially at rest) across a 10 m level surface. What is thb44eiv j+-i y eop,0e6 crp4iec;obh5 e 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 much work is 7rq-vj.hvl) rwf s+q (h)t/ boqp(w i6required to sto(wh fqls h6io v)jrq/7r.+t v pwb()q-p 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,*yi9j 8ppini: what distance is required to stop a car moving at 50 m/s under the same npy i*:pii9 j8condition?

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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 pj k51,wir a p26gl;lharopels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, 6; g2ri,ap klj5lah1w 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 +u)wb3e- f 5lecahcwg2ybs.x3 l ,n7 bhorizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is t5ng3+w- awy,l3xc7bc b2h elufse.b)he 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 horizontalf mpsrpg ks 8a)(7z l6/e*w1chly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrateshrl8sez 7c1pk wf* mga )(/6ps a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a flo h ogz*(:ttrt12u,a1lladg (tor to a height of 13.0 m above the floor. What is the change in gravitational potential aul a2ro 1:,t*thgtg(z(dt1l 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 i g2+h-pjt0tza s 4.0 m long and rises 2.0 m. If the plane is frictionless, how much wa tgp2hz- +t0jork 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 sp(l9dd v 5xkh7yring to stretch 2.0 cm. What is the sprvkddy hx9l5(7ing 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 much potential c q,7ll k 6u7njab83n-hoibf,energy does it store, when strnbu8 ,jhac,3qfo7kbi6 l-7lnetched 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 initiallytc 8bd5z1,wvf uncompressed spring with a spring constant zfcv8b1d5 tw,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 stretch a spswl: (ohoheo9 a;d( ykecia q(un,(x6l-m 0r:ring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assh -,ola(mi:ro h(ku:xeac(0len9o wqd ;6 ys(ume 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 3fs a ;r8i7nzmj6tqu/obu : qsd ..j+qN/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional +fqj :s.rbjnqz6oudm s3 uq;7ti 8.a/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 of a 50-m high sq:px0(6ye rvllope. What is the speed of the slier on pq (e:y xrlv60reaching 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 ye3)7)mso elpspeed of 4.0 m/s. Neglecting friction, how 7lo ee)m) 3psyfast will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottom, itikm5c9a p.g waxtu4 8+ has a speed of 9.80 m/s. What i9 x c+ pwak8tg4.mai5us 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 flj,tlb+n 6sg+5 nxqe gt )5g)mqoor, its potential energy ex )gg b qx6n5nlsjett+mq+ ,5g)actly equals its kinetic 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 uwwqf9d8/ as 43rtat510 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 8f ut3w 9a/a45tqrsdwis 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 kineticybrtni4bd;wrh w3j )(.j r97c energy of 220 J. At the highest point ih.43(ybbd 9rwni rcjtjw ;7)rn its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom ofr4)pg mv p21bu a dip (See Fig. 6-2). Neglect friction, what will be 4v 1u2rmb g)ppthe speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of nn5ta 8b:dn0j xscer9o;rt 9)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 sl;:n9erj5o9n cx)ta 0rdn tb8sope, 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 p.uw wn.6mcp 7ks wkr4qr1e5: xoint 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 spe71repmk.w4 .wx wusn:kr q 65ced 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 bottom of i0v* n0 tt1 lqko4oqx/wts swing (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from the vertical ar*ta b7 quw :vqg1:8ir,p ccr,xis and released from rest. What will b:,qbcpg,1rrr8:*a7iwquc t v e 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 uncompressed horizots6j 5ak p:1f6kgfa, wntal spring with spring constant of af6w1fkkg j5s6p :t,a$2.0 \times 10^6 \; N/m$. 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 xk n5ujnhv*qjal:5yw. ,lpcx.* n. h,22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction .jxy .nk,*l al5hwnxnv,. uphc :jq 5*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-kgf .4y(wd)c67 auunkt h object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dis.fck 6 uwand)y74ut h(tance 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 onj-.j8e zjl-wq0l fa d9 a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. jew 9.zjld-la8q-f 0 j 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 todw8/f .wycs7q rxg0j f/,as z1 bxj2/x a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the d xwxrygs/w sj8zf7qb 02 fj/c./a1 ,xmass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slop1*mw2mi i6ywg e. If the work done by frictio16wmm2 w*yiign 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 kwkf.3eq lh;f,w-fu zgw4+2wur(8f yup an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to g wgfff-rq+2lw,3 ;zw k yuwu8f(4 khe.et 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 smb7r5p*ob+ sh*)z pyplane inclined at 20e above horizontal. The coefficient of kins+*p bm5r7yh bsz*) opetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and stqz0u(c;j anf v*))syxn7w4 wcrikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as;fju7q0an4sc )w nc*yzxwv () 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 en k6 s8.ygfh+ubergy when he runs up a flight of stairs 10.0-m hf8sugy+6k b h.igh, 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 velocjviw +29yf: syity of 5.0 m/s. What power must be delivered to the object by the forcjiv2 s y+9w:yfe?

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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 hpe,2 s pnr(p+wb motor that runs for 1.0 hr? (1 hp =bs2w+,e(p rp n 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 5y :a ;tite4//rkr nfi/nbtz07 00 W while riding. How much force does her foot push with when she is trk/abiten0; ntt:/i/ r ryf74zaveling 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. Wha-m gxwo3tti/+i8o z 0epo87ypt is the average power delivered by the engine? (1 hpp+gz7i i 0x 3m-o o/y8totw8ep = 746 W)

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