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习题练习：Physics Unit6: Work and Energy
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 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work o8b /ibhr1 7t /-muumcy:ioo8 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 there is no mopb/wr m xul45q0;gg0ction?

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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 aga 5a rao.o4due.inst a stationary brick wall, the amount of work you d ro5aa ..eo4duo

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is being held there. How much wt)wr pqm, qm.6ork is being done in holding the box in th)qw,.r mqpm 6tis 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 horizontac02ava 2cr8-ydke i t(lly forward at a constant velocity carrying a 10-N object, (8i-t 2ak vyaccder20 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 ver 94vea5x er syo87 ubz9+f+dwetically 3.0 m then returned to its original position. If the toty 4 ue9 zas+e7xev+98obwd 5rfal 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 e7z2) h.a7wzn2c n u sgn6eta2b.x5yhacting on an object 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. Compare the sign ofrd19mmkj65 0kfgv 0 toa*n n2i the work done by gravity while thm0im2kf16*9jn kndg5trv a o0e 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, represip5ol) 1 gqa*bentsp 1)qbi*5glao

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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 versu xpirod *7*;he3ilib x /4iluvqn;/wrd y ;4c)s position (F vs. x), what represents the work done by the force Fxyi7b*ii3p;cd;l/q ;e)ldw* i o44/rvuxnrh ?

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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 y 3zpm13 i9quyb+5z x3k+rvgean object 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 objectcslj i)c1)v e/gyh cy),wik)+ 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 done on an object is zero, then the object's kinetic e 1;iucd- lw7wf -2tcplnergy

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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 ca m0*62; cmswc um(ftxlr, and is moving at twice the speed of the car. Which statement is true about the truck's kin0*s mf2cmc6(w x;tlmu etic 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( n/wqzo ka0f,0vp3 bxt t5zy. J has half the mass of car K. The kinetic03yto5n,f0 (zkba.pt vz xwq/ energy 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 a3;oru:d3ho gq v,k6 jwith half of its original speed. What is the ratio of the final kinetic enehvo g3d ,jrk3 u6qo:;argy 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 a 3-x 0pdtnt :y;ql5vskww 6d:ut a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick'lvds :nqxpt;dy6ut:wkw- 3 05s 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 moving with 81bijgkozjar,d / 340w mvic5speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest a vo zkiwjj01/r di5,c4bg38m. 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 in a panic, and skid a k-4xu5ybq q .5ilajt0 certain distance on a straight, level road. If you had been traveling twice as fast, what distance would thu5lqy5k0-x4qibjt .a e car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun 0 g/w2 fhycuy*in an elliptical orbit. Neglecting any 0wy*ch fg/y u2friction 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 principlenenlz+(j o(knk0 8:x/ag 6pqv a+e7cw.
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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/: izyup ,ryd2 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.90su qcjp6*u z A second object with four times the mass of the first if releaucp szq u609j*sed from the same height. The 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 spriv4iqbof ed739ng causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy be4v97fdq o i3of 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 systs 9+qi ;zz00lk3rr4 jgqz5wpiem

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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, to its potential) *yocst y7v(s-nksqz69 1sjw energ)zkso v*sswytc jnq(1967ys- y 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 g iqu a+-*kv.gcar driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding ayv9wu 7jte 2 6hbh(k1ux(mvizk7n50 with equal speeds along a level frictionless surface. They both slide up the same frictionkva (ei7wh 62k5bmxj970h1t ynz vu (uless 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 lnkb;g; )nd inc9u;f:cz .kf23k6ihzw ;p ni*$m_{1}$ 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 cogyef4 1bfxx(gl6 4xt0 nservation of mechanical energy for conservative forces.yf1l f(btxg4xe x 4g60
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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.2fri) ( 0rh nzoln, *aohwdj5 a building, through the air (air friction is present), to the ground below. How does the kinetic ho 0)zfrih nad (rn ,5.ojl2w*energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and ga8. gqtqi3 wedz b/0(35yxb7 c:mp trvains 30 J of kinetic energy. Do not ignore air resistance. How m8 yt3zae0v bwcd/.5rm tbqg(ixpq:37 uch gravitational potential 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 distane*v g*k ou8wnnw/a ;49ssf(z ece and loses 30 J of gravitational potential energy. Do not i */f ;g9s zuea8owv 4w(*nnskegnore 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 conse-eyhjn ) :7g;v fnwo4jrvation of 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, kl:h i:,wgdc

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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 3q2 fa +ll-iorexpressed 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 irp sai o:dth,v(80lmm:0l f5r;keh )ls 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 3 times tx* qij2zz*dr 4he work in one-third the time. To do so, your power output mustq4*j zdix r*2z 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 carjs6 smosw:v 32'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 as;r9k2j 4oig.ts+ ,idsf.c 3f szfh+bnd held there. If the object weighs 90 N, how much .ho3.z tcs,fkij9gs2 f+f;dris 4b + swork was done 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 th2a qv*ivv j;d9e air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What javq9 ;2div*v 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 for7 ) e/fgik2i05 tnjepn a distance of 50.0 m. What is the work done by the 550ke f 2)ntp0ij5g7i/en0 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 db 8 n,j(, ,+rlfkebyjforce of 5500 N for a distance of 50.0 m. W,djbjn(kly8+br ,, fehat is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pullejwgrp, dp2+u: d upward with a constant force of 5500 N for a distance of 50.2+j pd:gr p,wu0 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 q0 a j*x,qvw pymg6ue);( lkk76.0 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 dgs +hbbp4 bh0ae4nl1jy)a ei,r* +8kl*u v4yaown 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 Sarahzf:wzzg l:/qyi)n2f* in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angl):2*zfl/zy:g ifnq z we 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 ip:mp/o)f on fza +x/e4n Fig. 6-1 shows the force versus the object's p )/: p fenafzxo+4omp/osition. 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 forczp2wc,yi6c. zeor /0) kqa/c2p t gt-je. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.o p - 206z) cit,prtkzw.cqe//g2 ycaj


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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 direct43xrwo )jbd-bion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.04)dj 3box bw-r to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in ;i-,impr vh 6ibz 80ajw8chk8 Fig. 6-1 shows the force versus the object's position. Find the work done when the object mo i8bi0rz; k-ic8vh 6pwhjm8a, ves 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 (initially at resth/ht-u u7m axvq) .;kslx7r .w) across a 10 m level surface. Whaav)wkhx7trxh 7uls; m../uq- t is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kr)ffti3t5 j4op8 3hkt g cart (initially at rest) across a 10 m level surface. What is the final h)tp j 548fitkfro3t3 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/u;9dts4iu: kj501 /a t pcpamis. How much work is required to stop th u :su;ijtc/9amda4 5tpp0k i1e 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 v71 nni-z1tkze0x zf+ a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under tn1ietx0k7f-z v+zn1z he 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 0)jll;gg 0ahya 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed w;0lg)al0jy hg ill 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 componentp4:)gs in8bmny 52.iqcwsy 8a of 80 N and a vertical component of 60 N. The force 4 ypins ci5n:sb8qm2g 8).wa yis 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 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 q8ehhc lj1d7w s+ u6d)is shot horizontally 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 stopping force acting on the wc7d l6q+ 1j )8sehduharrow?

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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 ab4 bs1bf w:ulu4ove a floor to a height of 13.0 m above the floor. What is the chb fwsbuu l:144ange 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 pushedtxq9bvv kt a:8*0dq/o up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much workqk tv o9 0qatx*d8b:v/ 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 stretch 2.0 cnk )lcffhcl0s / by-12m. What is the spring constant f2h/1bncls-fk y0c )l?

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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.2 *uhibx1 nthh bl kt*42se0p4 twi.2i How much potential energy does it store, when sb 24hh tx2tpwe*ib l0*u1hin.s2 kt4itretched 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 spring w rn388;0t52nantlpdoxb rci 2 ith a spring 08 nxa83;ornp n2c tt b5rd2ilconstant 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 st 7+l4xcnuu 0-gpbxq5qretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x -4pq7gbu c +n l0uxxq5= 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 q;au80z 6be/qv1d 1jff n 2aurcm. How much work is required to compqf1; un/efraqvad j 1zb06 8u2ress 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 to mgp vcpgl3*dry )-s 2),1ncn;tmm- sh(ix5mhp of a 50-m high slope. What is the speed of the skier on reaching the t p glnxd,5ph3 m)m)yhsis g-1(n2 r;mcvcm*-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 speed of 4./ prf, rgj.(y.m 7j)kbup -fyi0 m/s. Neglecting friction, how fast will she be moving after dy iu(p -fy7rj,r ./ f)gj.bkpmropping 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 frictionlessa 0p+zl 8wp*rhj9dr3-qcuh y5 inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heighthdzqpj0la +ru c5yh8w9* p-r3 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 it43 9te vnr*xur is 0.70 m above the floor, its potential energy exactly equals * u349xn etrvrits 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,)mfkt2 4 xg,0h qop;ge blasts straight up from ground level with a kinetic energy of 40mkg2g,) oeh04 xq ;tfp 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 grousna1c kl g az0/hv1;9wnd with a kinetic energy of 220 J. At the highest point in itnl0w s hg;9zak1v/ca1s 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 r 4h/hx5y7uzns z,94y 6plbhbn,7 byis est 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 bottom of n7n7zu4b blpi4s9y,byh x65/sz ,hh ythe dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s f97w:bozz 5:vyi/e fwat a point 45 m above the bottom of a dip (See Fig. 6-2). Nego/z:7iw 5vfewbz: f9ylect 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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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 abc0xer td(re4 g08n(f2 8qqazaove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top (fq aqc00age4 x8(zn 8 tredr2of 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 boe1nkfyit)57kspj47+( j bdio ttom 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 2-kg pendulum of length 50 cm is pulmuh /5)jbh;jtgsy g9mpo43j3led 0.11 m away from the vertical axis and r 9mp yjmu/g sh5h)bjot4;gj33eleased from 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 an initially uncompressed horizonta2e-nf3jumww ml2nv8; l spring with springej-8flm2 ;nvn w 3m2uw 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 to stop for a1 dg7/bl1et +ugk m/qp red light. What work is done by the friction forc/7q1dg ge uk+1mtblp /e 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 ansx2a 2* b+:jo-jhsrq rd a horizontal surface is 50.0 N +s r: bh*j2qjaox2-rs. If the initial speed of 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 a rough ut do9:oba5 . jqgg(s28b8gvo, level surface. It has 24 J of kinetic energy. T2gbvst:o8 do8a g(5.9guoqjb he 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 tbi.d8xb-6ye n/ cq7 oco 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 mass is moved a distance of 10 mcnebc8d/o b. -y7xq6i, 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 theq0n.ly4+)b esqgq(rbaapi . . top of a 50-m high slope. If the work done by friction is sbbniy(qe 4 lqra.)0 .qpa +g.$-6.0 \times 10^{3} \; J$, 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 8 no1zbt*/s9)fakkn v 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 *k19kz)b8ov f /st nanforce 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 inclined a+.cwe j+itgx,l51s xj t 20e above hx15ijx.c g,++esl wtj orizontal. The coefficient of kinetic 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 0u:7f*gwgrea a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s:0w gg*f7 uare. What average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using en: hn2 ah7p4 gink)kit9ergy when he runs up a flight of stairs 10.0-m high, p9kh 4n )iktan:hgi 72in
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 5.0 m/s. 1icq1 0qhek (pey --rfd*pe.yWhat power must be delivered to the object by the fpfrq0* -e d qehe1-cyk.i1 yp(orce?

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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 be 26 l.hadv1pu ds4+isy a 1.0 hp motor that runs for 1.0 hr? (1 hp = 164dhdeu2ai.sv +pls 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 while riding. How much force d bia)l(r4,ot dwu y7b 0hk yib/h9*qc9oes her foot push with when sh haib ctybhqlwr 7k*9ib0,49)/(odyu e 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 zp*4itwc9m ,o 1vdgn-m/s in 7.0 s. What is the average power del1vzp nt i9wo dg,*m-4civered by the engine? (1 hp = 746 W)

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