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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 worw 25ipl* t*y,2thv;eyj eq l*kk 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 syst7m*wvwg5/f)l - s79 dmhez49ca v kom4bqv-ihem 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 bri6 s fxclku/ hga70p6dpv(u 2fk e2qz0;ck wall, the amount of work you dg00fq2adk ek uvc7u/6hlxsp6 z2 (f;po

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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 iqq833pauj ; yk)x3o p2.0 m vertically and is being held there. How much work is being done inx oj3;iqku)qyp pa338 holding the 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 consto7kv t4quv v3-r xh2o/ant velocity carrying a 10-N object, th4 uvrtv qv o-/o23kh7xe amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to its original phngzto3f.0 rytr5 c7)ositir37oz .ft) nchy5rg0 ton. If the total weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an object do work yxqoy((:yfj q3(8uy e 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 straigh7e4grgslp 8 4r -a.r 3uf;um 7nnwco:ft up. Compare the sign of the work done by gravity while the ball goes up with the sign of the wor s4u;opa - ru nfecg:n8.m 377lwfgr4rk 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, r4s (t dwhw1;rtepresents4 dwr(hwtt1s;

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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 representaoj . he*y8 zj;1rmeir-/jin- s the work done by the force Fiajz;m8/. j j-er*-rni hy1oe?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, then the object's kinetic en5/udfe h n61m vi.l*gsergy

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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 nt 2dxe(5253 k 34zqt 5pe(rsiedli bion 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 done on an objectcf)8(1 oy g: +ock5pj,hixtu x 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 is ml ftc,phy7-1nd1 xf0o oving at twice the speed of the car. Which statement is true f ,td0pof1-nx h7cly1about 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 has half the mass of car K. 6g g,6sixwd p5The kinetic energy of car J, compared to car K gxw 5pi,66gdsis

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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 htc ti/rk1ba x4:mxbp0him :( -alf of its original speed. What is the ratio okixbcirmbp-mx :ha4t( /t:0 1f the final kinetic 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/ yc.)r ; qzw oor/4,vy)ej0kt ptvmf) is moving at a speed of 5 m/s. If both objects have the savt4 0,kwvy pfo/ty z/me)q)orj c .;)rme 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 ma-vai7 ohw 5x+hss is moving with speed 4.0 m/s. Boti5xw-7havo h+h objects encounter the same constant braking force, and are 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 in a panw ownv el,l( tm)cc3-vwq(5q0 +9o bheic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the carmbc)l 3(e-9e t,5n0hwvo c owwlq(+qv have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an elliptical orbit. N u-c)ch8*)id:0 -jm uurgtfk zeglecting any friction effects,c*0-if8gc du):mjztk- u ru h) 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-energy2e*irpptf 3a0hl ,oyqghyn(/,l v*m/ 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 system to have negative potentialrz1 r4 bob4yt( 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. Ad2mq 86lyl.ea 4 mthd7 second object with four times the mass of the first if released from the sa86adt7 qdm ymell.4h 2me 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 spring causes it jyg.t c532ju bhjz2p0 to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, th tp3u52hcbj02 y jzgj.e potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy :12 njj le shpd):(tncl i5c7eof 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 e1foku+f 4i +ofnergy K, to its potential enerfko++o fu1 i4fgy 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 c2oco( z0p z5ef7r e5xt uf332 zh:knetar 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 with equal speeds alon9z3yt ;f d;z9 ct4cmexg a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greate9zctf4dex c3m; 9 ;tyzr 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 )vwa mi0b0o 2t 8ep4ks$m_{1}$ 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 mechan/8pki*n0 uhofical energy for conservative forcesi hfpokun/ *80.
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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, throssr)5 )xdl4jgugh the air (air friction is present), to the ground below. How does the k)l gjs5rdx)4s inetic 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 gains 30 J of kinetic energy. Do not * 51d,.ravamw7)jox amgui a* ignore air resistance. How much gravitational potential energy did the*j a v,gm x .oam7d*w15)aariu 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 energy. D: 0)lfr+kia:vamt6 sh o not ignore air resistance. How much kinetic energy did t+m6s:a )fta0 vrki: hlhe 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 conservatio2f8podpt( y)8,)gomwc cfz5u n 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: w/ov2eis9 on

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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 exprerqx , rogzoc8+w925 vbssed 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;.cqa)5z(yj9rf 5j*rbxbg,wq ye k2 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 the work iniw(g7n9/7n tr xd*p zt one-third the time. To do so, your power output mu7 itn*(z9pgrn x/dt7wst 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 accel53:jdaeh 3evxo*l tr6tld1 q3eration, 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 apfi k ib/.h6jz .b1z9ind held there. If the object weighs 90 N, how much work was done in lbpzfj.69 i.1h /kziibifting 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, atv7 zbiu) ug48q a constant velocity of 0.50 m/s. What is the work done by the weight of the book?7zbi)vg 8q 4uu

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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 pul09xuu, az9 qe6kl l-utled upward with a constant force of 5500 N for a distance of 50.0 m. Wl6t0 ux auk,9 e-q9lzuhat is the work done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward w //xlztkm x*i.ith a constant force of 5500 N for a distance of 50.0 m. Wmxt/zik/l*x . hat 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 pulled upward with a constant force of 55b+/d fqvy*6 k37-1luq mkzphn00 N for a distance of 50.0 m. What is v3kf q761pnqz l+/ykhdbm- *uthe 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 6.0r-*q ivk 6/pb6v h x.su9ywxg; 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 slide l.c66 22pxms/rvwkt5 )mm jbns 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 lit-zy2sg ;smo n;tle sister Sarah in a sled on an icy surface (assume no frictsogz;m2n-;s yion), with a force 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 d v iy9pj.q0k,bu+m6z airection of the force. The graph in Fig. 6-1 shows the force vers,6j0+.kb pivuymz q9aus the object's position. 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 thvgcqtjz; )ta1 ( g9t9se direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. 9v9g zsc1tg j;t(qa)t 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 ofb2ygtgscxj53j0n r 5d i1s44gvw 60 eg the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thegyv 0i5s1 jt4 xcb25g4wg6 snd3ej rg0 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 ds9vwdu6n6: p, qe wh+8gdvem7irection of the force. The graph in Fig. 6-1 shows the force versus the object's pg q+6v,uvws dm :8ee7whn9p d6osition. 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 272q iygn6zu9d (glhu(00 N is applied to move a 55-kg cart (initially at rest) across a 10 m l6hdun7gg9zy l q2u( i(evel surface. 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 to move a 55-kg cartqj1f:*q/ w tpe (initially at rest) across a 10 m level surface. What is the final speed of the cartq1 t:/qw*f jep?

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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 -w0j1;ow)- rvodd8o, z wzkvqspeed of 5.0 m/s. How much work is required to stop the mao vr1wwo-d; o8v qdw)0,zzjk-ss?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially m4 c-o6aroh8b;za/vf a oving at 25 m/s, what distance is required to stop a car moving at 50 /ahac- fbo rv846az; om/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 tx( q(dz:5ke iby exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, ax q5:d(e(tikzssuming 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 ver8xy,dyv4 b3 qz mi)8bttical 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. What84ybmvd,iy)xt b q3 z8 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 horizontap sb( *auvhm:/lly into a bale of hay, striking the hay with a velumh: s/p vab(*ocity of 60 m/s. It penetrates 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 5 2pkkj.7ginua floor to a height of 13.0 m above the floor. What is the change in gravitational poten 2.jin pu7kgk5tial 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 760t3d fm:wj3ueuhmd is 4.0 m long and rises 2.0 m. If the plane is frictionless, 3mmh ud td3eu jw70:6fhow much work 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 on cl: (axsbrxq*bbp i8.cy*2,nto a spring, causes the spring to stretch 2.0 cm. What is th*nas 8.ir:*xx2 cybplbcq,(b e spring 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 co-gy;uu suc82l. i h)uo9utnz8nstant of 60 N/m. How much potential energy does it store, when st-)hscnugu8lt8 uiuo y2;u. z 9retched 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 a zfb/b(j./q/7zttu0 i3me p qcompress an initially uncompressed spring with a spring constant of 25f3qz.bazm t0 7/j/ bp(iqu /te 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 sp s(; ..rkxjd m6tw revbr);yr3xhv30hring of spring constant 40 N/m from x = 0.20 m to 0.25 3;whh.e xk. r30tbxms6 d (rvr;rjy)vm? (Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressed by 3.0 2o2n-c +gcoxkah c1j/cm. How much work is required /+oj kgx2 ona 2ch1c-cto compress 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 high sl 5rkze(7m v ywmdr40n4ope. What is the speed of the skier on reaching the boty4d5kvz w74emmrr( n0 tom 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 th3g7)q.jhj6 awdvxu- he top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after droppingjuw7.hj6axgq) hdv 3- 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, it e bcd+y7c lc b:9af6s)has a speed of 9.80 m/s. What is the vertical height of the plane)6 lcbca7 s9fb:ye +cd?

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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 theck6a2wa3fsac64ovjd wo*.e cwg; ,(j floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it mo3ocw 4*efd6c w.;vw s(joaaacgkj62, ving?

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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 straiqcqz wm5p(9m, ght up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140c ,qmzqp(m9w5 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 kineticzu+9 ce pt3,dj energy of 220 J. At the highest point in its ujd+z,93t ep ctrajectory, 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 ly+ekbc3;ry9 0f 7rzz 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 bottomyefb9c lzr 7;k +zy3r0 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/s at a point 2kv/,l qpau.pv9egqmp2vh,6 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 slo v q2 lavugv,.2qh,9p 6epm/pkpe, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of axz8 lcif mlr8aq- f5hju)m4muo4m* ymo7 +r6- 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 tou4-uommh+88j y*m 5mix)c-rzfl f67or 4amlqp 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 thshyxct, -syoi,5r(v 7 uu0u 5le ball at the 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 2-kg pendulum of length 50 cm is pulled 0.24 m away fro)xliyjz8xfto7 - l9 7eeu0im0m the vertical axis and released from rest. What will be its speed at the bottom m jt e0illx0 x-i897ze)of7uyof 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 h;z kxzu3ds .ny *5sh125 m/s hits an initially uncompressed horizontal spring with spring conxs y5*;3 z 1hdz.kunhsstant 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 dowodn* jcapq1w5.dh0 ;qbx8q eu4 p+*h sn her 2000 kg car to stop for a red light. What work is h5j *o1pq*su. ;4nea0 wpdbxd+q8cq h done 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 z)jpz m ic5u03)dsfs sm 7+(pua 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distancpz f dpm s7m s)uzu)c50i+js(3e will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surface. It3nvxvjut8 p fsfvtv2;w2 p-7 + has 24 J of kinetic energy. The friction force on it is a constant 0.pj7-svuf8 nwpt;+t 3fv2vxv250 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 level subc/zl3)w0ot3r 8r shw ad4+,m aofo) wrface. The coefficient of kinetic friction between the mass and the surface istwrozmo )ab w)d,h/f+0o3 acr348w s l 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 top of a 50-m high slopeg5 k 5uq7ed-ci* pe2lvw7v op3. If the work done * pvpio5u7-3e7wk ed5lqcv2gby friction 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. oiu k4kl4 z 3yn/z*ahm3wo4.4nmt-t tThe plane is 4.0 m long and rises 2.0 m. It requires 32n 4w3 mo4u-h44ky/*k.m 3tzntaoizl t00 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the h*z oh+ay-g 4fh4y5cf 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 mass aftera5fy 4*hh -ygzoh4cf+ 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 +nt54 c;u:68 p4l bvrs0pkil jn qod,g7b0elp10.0 m, and strikes the ground with a velocity of 7.00 m/s. What averavrnik4 0q 0c5belo6l;td,gbj:s7u+ p84p nlpge 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 energy when he runs up ;) 2 666fdt wb6q)guz qiyxtfaa flight of stairs 10.0-m high,q6ytaf2)i6)qw;66 ug xz tbfd 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 con1:ip n-:tnjgc stant velocity of 5.0 m/s. What power must be delivered to 1:p nci jt:-gnthe 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 bydm)cv+bu9ao ,f:2 ,, iblcpxy a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 dcpc,9ib v ab)fuo+ ,l,y:x2mW)

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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(v439ddeq9szc /n4t a f/vcbi while riding. How much force does her foot push with when she is traveling at 8.0 m/szvfs44v9c//d9n b(qcd 3ta ei?

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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(h5+- /o sg9rt6mnqsay*tf8 sbf3z wt.0 s. What is the average power delivered by tr+ 69otm3s8ag(fsybt5 -s fh *w/zqnthe engine? (1 hp = 746 W)

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