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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test60.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed i8 fim)jx;gzp*c cl( ya4z:h )yn 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 there is np 6dx3l (thk0 9pir0,ow*telio 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 brip 6 -yvd09n.xc +jsh dyin0kl-ck wall, the amount of work you n- 0dpx-6vldnyy.chsj +k9i 0do

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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 aro.g s;4j q1xrw f5g 2a0)4bmw-gty lknd is being held there. How much work is being done in holding xg l) grw 1b-wmq a4t2.0jf5yk;4os grthe 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 velf 8gghx9j0a mmw5z aa:1bg(h1 ocity carrying a 10-N object, the amount of work yofhmhawa98zx51ma 0(1b jggg:u 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 returned to,y2v4(6gaeoj rm +jdl its original position. If the total weight is 30 Nora2,v (eg64djyj+l m, 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 s zkugiewb5w;j (j7p6 2d.rf; 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 xsy2 ky2t4ywe3 2 :vszup. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes do2y3s k2y zyv4sxet2:wwn.

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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 Forc**bj:cxqd bv 0e versus position (F vs. x) graph, represents0*bx jvcqd :*b

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents the wop ozkvmj)-3y9rk done by the force F?povm3y k9 -)jz

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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 object8wfg)o8d )vs(ogrq t . is 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 on an object is negatj g.anm y(p-c9ive, 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 zhvfq k8lnb c +x+k ;rdpb5*x:vacncy3+) z( m.ero, 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 twice thqr4-,ydgtlx 4e speed of the car. Which statement igx,yd-r4t4l q s true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J h y 20pohjjt80xas half the mass of car K. The kinetic energ 8 xph2jty0jo0y of car J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speesm/b oa*ttsd-od (2f+d. What is the ratio of the final kiat-f2/+so(dd*b om stnetic 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 pebble is moving at a spei.1 aa+gqn 76 wq)njxhed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's a1+jqg w.qxa h i76n)nmass to the rock's mass?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 moving wit cyjj0 qq;/f) :u vt lvk8zk(xlk..m7dh speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stoppingmctdq. fj zlvljk8:k ).(7xuv k/ ;0qy?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 a certain distance oc8 : pkf 4sc+oyhtzal+ 6y1r,sn a straight, level road. If you had been traveling twice c:y14+sk8c+s ,tolayzp6 hrf as fast, what distance would the car have skidded, under the same conditions?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 glwh( e7 n lt, b4 evw1znm)a4;p:uka3an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy?p:b7 w 4 ,(4z gkvtnma;1w e3ahuenl)l

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energyh8 512gmws5zh.pb llc 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 systemiy fz);zm14vt 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. 9+l5z0 jqb;;hd*cbkem0 mskg A second object with four times the mass of the first if released from the same height. The potential energy of the second object comparemh;g mb5k+0bq0 *cjd;zk e9 lsd 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 toe;tm2yi -,)rc gcxyc 0-csiz 7zk j)b) stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential eneesi2b-c c 0mzc ;)cy )rz,kyxit7)-jgrgy 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 systemka l+;1ddn ; (p1b0bu+jxc uqi

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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 kint c3 :7 opqbe5xwafl1)etic energy K, to its potential ener7 q)lefo:cb53a w1txp gy 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 arv4 pdzrw.h-4f22k wq 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 are 28cyox/xn .aqsliding with equal speeds along a level frictionless surface. They both slide up the same x8q a/2.xc onyfrictionless 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 vvp koc4:jnm+l gapn h y.k:.0*mq.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 energy for conserv4yji4 god 7o; 6sa5yalative forces7y iglaado;s 54jyo64 .
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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, thkdcph +y2/:mg rough the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare t+k2h cgpym: d/o 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 nouyj*2-+j0uspy tu.ft-dz h :at ignore air resistance. How much gravitational potential energupstd a -+yzu* .u-j:2fthj0yy 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 potential,:wbeb,)m7 vwzi5qfg j : o/kz energy. Do not ignore air resistance. How much kinetic energy did the:e )/ io7 j,,zmwwbvq5kf:gzb 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 ene) xn)w: :on/g icd6dcergy.
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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 3bc4 4h-fityw*dg yl,

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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 o7g 3re;;vk bl6qrq, olf power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit of powezh y,41 7cwk(owbi.tpr?

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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 w 9f xavr a3ab)qnp53u+,j pr.pork in one-third the time. To do so, your,pra3xbvra+p9 upnaf q .5) j3 power 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 con:k vs*+lzkpx) 6-yd1xw5ik m nstant 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 th9o( ipqhpo/1t e object weighs 90 N, how much work was done in lifting tqh1oio p(/9 pit?

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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 ru-dj qw 03:y( 8qbyha1.0 m, at a constant velocity of 0.50 m/s. What is the work done by theyr 0: 8bj3y-q(a quhwd 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 forcebfp2f5t ,vlu6 of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N forcpu vt,2fbl 5f6e?

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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 conb4) kn8d 5de8qmnmvm ;stant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of tb8md; n 4k8 eqvndmm)5he 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 constant3zgw w4w4zgqart+c y930) d :ebsp0jq* 1qzcv force of 5500 N for a distance of 50.0 m. What i)w0 y +d*vsgzbgja:qrwzc3p0eq 9 4cw1 4 tz3qs 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 al+ 7i;(-f 5pihangl mbr23wjepong 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 s4tx m54lb13re3qw )iciyvmie e+q-:t lides 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 an icy surface (a3 c+ i- vwi0+unhf *oaep(v)qessume no friction), with a forcnqo+e*vw(a 3 efu) -hi+vcpi0e 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 +5ogp+zu(pq, y8yahp(s xo3 sdirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. F +5+3qs opy8xps pyh(zog (au,ind 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.4+udp t g3syh8ozyl) i-3k hm graph in Fig. 6-1 shows the force versus the object's position. Find the work done whe-zmyik33op4 dyt)u hh+ gl8. sn 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 tz ota 1sq:1e ksu;2xc8ncz 8s;he force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesxe;:sc 8u1kz2zoas sn;18qc t 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 directiolbrogueb sh i-;2k)88n of the force. The graph in Fig. 6-1 shows the force versus the object's pbr- sbgku)o8l ;2i h8eosition. 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 mx8 x5m /oh7n xixm88fa 55-kg cart (initially at rest) across a 10 m level surfacefh i x/m xx5xmo888m7n. What 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 toh9z vl,:si6a*nt pd.s move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the sz:6,tli9dn.vp sah *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 ree434s bcty n2mquired to stop tm b2yc4tnse4 3he 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 ste 5 0yudu9bcq(5a6 hlfop a car initially moving at 25 m/s, what distance is required to stop a car moving ata5dl yf(u ub065hc9 qe 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 propsnygg *wo3u: /5 nu annbu3/v8els 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, assuming the spring has negligible masunn /n */5w3ba:8g3uvsouny gs?

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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 component of++ldc ix5 ,dl 6mw8uid 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 5+l+dmdiu 6wd,8il c x2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of hay, striking the hay vgu*o 32pa5c2kfov1z with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on tp 2ak ogzv uco1fv*235he 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)y4jzx9vd aw,g y) bu-.00 m above a floor to a height of 13.0 m above the floor. What is the ydv-,)yzw j4 u9gx )abchange 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 ) ei 3ijoh2nn+is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was djne i3i o2+h)none 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 ag/u 9 gtep7e0dqg 6r6stretch 2.0 cm. What is the sp pdgq rg6ea6e9t0u/7gring 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 l:y- h w3igmii*vs:k ex7 .s fl3ofc5-N/m. How much potential energy does it store, when sw ss*c.-5giey:hi: v-kf l7o 3xml fi3tretched 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 uncompressed t0ng(mo.eviszxn n9 g5*;r sms q- ;(uspring with a spruoxg ;m q(9zg; smnn.t v 5*n(i0-rsesing constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a smnqzz: 2 e,c 4ku)j.xrpring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstre.n:2q ju)c,m z 4xkrzetched 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 initiall(x3h9ij2-g sn- dd*stki*s v7bm-gn ly compressed by 3.0 cm. How much work is required to co*(s9g-ns ijildtv dhb7*sgk2- mn-3 xmpress the spring 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 rest from the top of a 50-m o8+ k4bw:hurbdxmcpz( - +r3bhigh slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect p+b3 h8:(xm ow rk-z u4bdb+crfriction.)

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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 thekcj++a)cj00gb.qr j6x w e cs- top of a hill with an initial speed of 4.0 m/s. Neglecting fricrj 6 k+c-)qxa cjbec0+.sgjw0 tion, how fast 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 frictionlessy)2c 8pv)bvk;ca00 ho4 n vtjw inclined plane. At the bottom, it has a speocvnv a0k2bw c))h v0y8pj;t4ed of 9.80 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 the floor. When it is 0.70 m above the4solo lk( 7/oq floor, its potential energy exactly equals its ool/7o(kl4qs 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 10 N, blasts straight up from ground level with a kixfu(14 eqgot1netic energy of 40 J. At the exact top of its treq1 xou4g1t f(ajectory, 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 mfh ubwg)s4w):z4 ,ra;hz i:aw leaves the ground with a kinetic energy of 220 J. At the highest point in4 w:,i;h)azb4 : fg)rwwszuha 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 of a duzch//*fe:uen9 i* xbho )hm)ip (See Fig. 6-2). hzu )ee):hfochi/x n 9mbu**/ Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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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.,hig7 zworn 6/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 a6.i w 7hg,znrot 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 j fa5ggn(ek0fr dl8xswx 15)( of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of twfjsg(58()xn 15rdkx fgl a0e he 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 ui71 b0tn fy g;uz3vs6the 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 iqn07s(o,on uz-aojk( s pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of itso ( -jqa,zn o(0uo7ksn 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 e *7xh8 pqbj fvh;qstn:95c3g at 25 m/s hits an initially uncompressed horizontal spring with spring j8bng*qvsfxqh7pc h 9 :te;53 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 2000 kg car n.95e mod7jt1uv8 mkcu.u;wum+ -jyd to stop for a red light. What work is done by the friction fo7udm .vyen1 t.d c;k-o 9u 5m+8jujmwurce 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:5mzq -b:t ggbwss4o 1 between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of-sq:tmbwo4g1 gs5b:z the object is 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 a2oq;y)n z qeq*)*popi rough, level surface. It has 24 J of kinetic energy. Tq)*ye2zp; noqio* ) pqhe friction force on it is a constant 0.50 N. How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg mass on a l,:nx;iymfkb t0tc : pua-.ze :evel surface. The coefficient of kinetic 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 kz:.0cxntay:ekp ;:,tbimu f-inetic 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 :g/witf kr1agl.8wpcjg,htyr0u ) 66 rest from the top of a 50-m high slope. If the work done by figg,0/tukyp1g6c 6rtw8)fj a.r: wl h riction 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 m long 25),tq v ramlfand rises 2.0 m. It requires 3200 J of work to get the box to the toa5vl frtm2), qp of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane incn+/n ppelcb 80* 6gdo 5khr3ijum- kol-/6bjdlined at 20e above horizontal. The coefficient of kinetic friction between the massel5cpp- 6*gk 3bo nokm80dnjd6+ /bu /-hlijr 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 6g9erq ndjyq k(r1z-6of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts onq6 rj6qng( dz1e r9ky- 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 when he run.by;,le;yb kaz whc26 s up a flight of stairs 10.0-m high, ; bly6c;.ze2ahybw ,k 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 velocity of 5.0z.1qrn)st b /p m/s. What power must be delivered rsp1z.b /t q)nto 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 1lid6 ( tf0;.wvhlw 6lv.0 hp motor that runs for 1.0 hr? (1 hp =w; dltihv l(f.6 0lv6w 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 wak npp+r z;7u8hile riding. How much force does her foot push with when she is traveling at 8.0 m rn;zk+8 ppa7u/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 averagehqo u r,dwxjdz.g3;ozf((9 6r power delivered by the engine? (1 hozrz 3,r6x ;(d9w of( u.hgdjqp = 746 W)

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