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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 unit71ick e bgmz8 ,)y/fte of work expressed in SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if the6 c+es96 n ay)sn ip,r1qo0gmtre 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 wq :i3*t f(w4n- dlvbufh)9r2u*a cjgk all, the amount of work you dn9bdgjkut r)v*3c:4hf (aqu2 f wl* -io

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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 d2cel) r7r(i oand is being held there. How much work is being done in hold)2dio (er c7lring 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 constant vv8b+x cn f/mm2gj41wt elocity carrying a 10-N object, the amount of work you do 42gtbm m/ x wcvj8+1fnis

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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 re )qpsek (or3 0y2 cnsik29umd:turned to its original position. I u2i9erkpy(nsds :com) q302kf 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 obje+4 clj0kj/ve/* h 8dicl hz4adct 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 of the worki-6zccsr 0 h/iard9w :i, lm2k done by gravity while the ball goes up with the sign of the work done by gravitw2-h06ld/zi ir is9a c:kr,cmy 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. xw*pyfy 1,ff r:;tas c-jy65xj) graph, represents*1t6 a- x,:jfyf pfsc yjyw;r5

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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 thctaoa6pnk( 8c ap9;q1e work done by t 69cckana1 q atp;o8p(he force F?

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

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, tc) ch9 gx03 jxqr9np3v c71*guc8itadhen 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 obje7la 8,yvs m(fkct 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 thc7h: av6ae9p +p9plu je 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 the speed o-nncajzv 4;ccae/qpne1 70,s f the car. Which statement is true abo7cn4 q/j , pscnn-ae01;czeavut 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. Thq6/6sgp;o u6jwe -:e pz qft6me kinetic energy oqgpmet ue;fjq pz-666 wo 6/s:f 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 withv0q3t a,vv6 p,x9g ddc half of its original speed. What is the ratio of the final kinetic energy to the init3 dv,a69d,g v v0pxtqcial 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(6pfp/ psw8 ns0u sv35eedi p4 of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects havusds(8 4/i0 5pp6fwn 3es pevpe the 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 ma:px. ym7rpzgm.j1 qz0 oiu3r .ss is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought tpjx orupz:q .37irz.0gymm1.o 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 panic, and skid a certain diseh ,w-a nf9idedygz +n-1t;ih3 ,av/ etance on a straight, le3h i9 y-gd a;nn-/di,, h1fee wezta+vvel road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sugl(*r 0icxez8 n in an elliptical orbit. Neglecting any friction effects,*c0i gxl8( rze 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 principk ;ups-i g/k x v :*olna:ijv1dlg/ 6eq/1s9vale.
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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 hak,+t5gg (q7ih ugq2x dve 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 hexa.0t4j7j3flb ,: qlm1ryk yoight h above the ground. A second object with four times the mass of the first if releasedr7y:x,.ltlo4a31 0fmykqj jb 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 spring causes it to stretch 5.06aij8: ii 2w4 -lx,pdjf dv7hm cm. If another 0.200-kg mass is addew6 : hd -2amfi4x ,7jpvld8ijid 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 mechanicaleiu8 j qjz,l5:jxhn-* energy 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, to its potrwy:8l3tzn*kum :e ( lemaw1wp/4 .pw ential energm:y : zwa/l1.wmw*leenw(ur ptk4p 3 8y 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 drivingrhbuawci ;*5-sx2kk9* tthfoy fv( +3 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(wh5 jh 9zz ,jnsosr-.vw.nh( speeds along a level frictionless surface. They both slide up the same frictzsj(, 5hnv.h -j rn 9szwh.(owionless 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 vt(7 . ,6b nm.5x96yo7surb wjzlplil$m_{1}$ 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 x1g dye;o/w- ufor conservative forces.1gw-/yx dueo;
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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 au+h-l4a reieft f 6//l building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potent-erh tiae+l /6fufl4/ial 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 kinetok;-vhldi 6 fz+) zq-j oy0e/fic energy. Do not ignore air resistance. H)koeiyq0fo- ; 6hv dj+-lz z/fow much 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 distance and loses 30 J of gravitational qhu5tp dc4wip: ): /.ufyg9io potential energy. Do not ignorc)gud:. qp9:yw i o/4uih5fpt e 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 conse2 n1.dboiyxnfp :; t-5 pdvab;rvation 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 vbjz 7y6sy+n5x8jr n*

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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 in SI units7fhd h m ftk09(hed9;s?

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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 14q6pamo5zsw oixp/ihc0 fd)1*k4iyunit 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 ty4clejtfs po+6 ,u:s -imes the work in one-third the time. To do so, youlsp-e6 usj+f o,tcy:4r 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 constantvkhmgi) 1mk*+ 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 the object weighs 9 rv*vlf:u /mvkf9rg5 60 N, how much work was done in lv*urr:96/mv f v5flkg ifting 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 physic-h+ mt8kja,ei :svn)v)3q iz, s7 asxgs book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/a 8i))+vi th sazj,e7:mk s-q3nvgx,ss. What 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 Ndeky;l+pg ,qbpbk+,+ *st9n u for a distance of 50.0 m. Wt,spke;l +k9*np bb +qgy ,du+hat 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 with a constant force of 1 qke 1olmd77s5500 N for a distance of 50.0 lq1 sm1dk 7oe7m. What 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 5500 N fpurc(mwu3i*5g uw q-*or a distance of 50.0 iuuc5*m3pgurw (q- *wm. What is the net work done on the elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m u,r0p.f w, ioydeke62 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 sliqzo+t4qe5de.2b htcf+1wx k:des 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 sur( 7m 8:glkarmaface (assume no friction), with a force of 60.0 N at g(:r lm8a7am kan 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 thes ;.ztx/fb q.nr5 z7wx direction of the force. The graph in Fig. 6-1 shobzxx.sw; 7fzr5q.nt/ ws the force versus 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 the direction of the force. The gnbdv tf3vk)jqc97y+ -raph in Fig. 6-1 shows the force versus the object's position. Find the work done+v t7c)fv d-39jbnky q when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. g j9m4hqyfl19nckx pn. w:o9; The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 9ock9:w 9 x y.qfh ;1gp4nmljnm.


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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 di coap.7zukk+ww 8b,je*n zhs)y.zt+s;/k(kirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Findww.; 7)zzkks( py at*ucj+ sei /hbkz.n+8o k, 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 appli5ajlrfs 1 zlcjs+0: f0ed to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the05 f fzrjlal+ss0:1j c 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 8 s0in4p,o akfurik ),-a le0lcart (initially at rest) across a 10 m level surface. What is the finus o)0-0 k8ri,n,a4l pfilkeaal 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 mucx+lm/ +sgm5/ upxt3 dgh work is required to stopgtx35xp ++gm/ /dslum the mass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially moving at 25 m/s, what distanc+ar vo+ bk9uy1 ucr4/7c/d 5k mrrt2dke is required to stop a car moving at 50 m/s under the same conditikrud vrrr5 a2cy otd/kcm ub/4k+197+on?

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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 pfo q lgi19yh. a89zw gya.p9)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 .y.zwph 8lga9 iapf9)9y g1qonegligible 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 c*gf3tma/ vqvb3 p1( heomponent of 80 N and a vertical component of 60 N. The force h*tg(1va /mvp3ebqf3 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 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 intw7.rcw).:lz19 esj bb 0lgcsxo 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.s.g0rc)z7bc 9e bxws1wll j: 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 floor to a height ofk hcjuf8(h94 *rbzk 85zhhn;a 13.0 m above the floor. What is the change in;n9jbhk r8 *haz8c4uzk h5(hf 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 is 4.0 m long and risy( 3, i:fcreghes 2.0 m. If the plane is frictionless,c erig(y 3:,hf how 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 onto a sprmuzfq 6de216t l7f r8uing, causes the spring to stretch 2.0 cm. What is the spring co2qrldf8ue1 6zmuf7 t6nstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterizeov6x4ddkn7m 4 d by a spring constant of 60 N/m. How much potential energy does it store, when stretched by k7xdn 44v mod61.0 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 requirz7n2u25qy tdred to compress an initially uncompressed spring with a spring constant of 25 N/mnz25yrq 7utd 2 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 spring of spring constant 40 N/m from r ,s(pi( t e9c2v3ivxqx = 0.20 m to 0.25 m? (Assume the unstretched posi9c i (3r2,t(qpsivxevtion 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 7 06qg v+ (yokcecbtsr9x6l:dis initially compressed by 3.0 cm. How much work is reqc7e ybg9 ctl 0 +:kr6dvxq(s6ouired to 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 slope. What is the 2meh39s75ax n +tl os 4yag2)p+sbh,i(odoo i speed of the slier on reaching the bottom of the slope? (Neglpto hmabxgla3ieis7h ,+ yoo 2s5 2n9)dos(+4ect 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, push.+zqgmo8l c t8v:a7ua(1k yte es off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afteruv.8l y a1moaezt+7(gtq8:ck 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 2jy(q0atzw)13gobcobp07l vinclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertivc owb0o7y21pl)ag z0qt3 (jbcal 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. g tog7di0a z8fr7d+ 1xWhen it is 0.70 m above the floor, its potentgf 7i1ro0ddx8 zg +a7tial energy exactly 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 10 N, blasts straight up from ground level ws,cxs; and4s/+;l y arin m+7wo flt6)ith a kinetic energy of 40 J. At the;,4nc xosrta)lfna7;l i/y +6smwd +s exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of 22c6rj0im bzs00e:x v+x0 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vers: +i 0mz0jr0xb6vxc etical 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 theovo f*qb* tyyv+jc ;:6uh47 ol 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 the +o*bf o: h;vc6qyo*7tj yl4u vdip?


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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 at2) k:r pjh-(p,lizjvx 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 mpz, lxh (j2i- jpk)v:r 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 30ri :7;pvm4w/zjfq*tp (qxptk9o:+ hf m above the bottom of a dip with a speed of 25 m/s (Se+fh/:( 4kivt;tpqqm zpxfwj o*:9 7pre Fig. 6-2). Neglect friction, what will be the speed 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 its swing (pon 3 11xzc5okbbint

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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 3/,-dsr m8tubu 0 cm away from the vertical axis and released from rest. tu,rum -bs8d/ 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 6n;e ( xfnjv34wk5qj can initially uncompressed horizontal spring v(q k6 wncjn5 3jex4f;with spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows downodn098;wx dqh/fdwv0jl3 9l m her 2000 kg car to stop for a red light. What work is done by the 3 ;ndmflddv8 w/h90jo9 0xq lwfriction 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 betwee v ar2 pn2vjehr bv/b2p1*uq./n a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, whatr n h 1bu/jqv *r/2pvvp2bea.2 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 roughz k;q*zqsd4od i,2qa +, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far willas+id2 4zo ,zkdqq *;q 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 surface.09 bs;q4mo xzl The coefficient of kinetic90o;z 4lxq msb friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope. o p(gga1:cwbp13fp 4lIf the work done by gwabfo (g 3p lp:1p1c4friction 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 ,7uugofjky58q 9m7caan inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was 8j5o uk77ymq9fcgau,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 inclined at 20e a82i el2d0mdo hbove horizontal. The coefficient of kinetic friction between the mass and me02hod2 dli8 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 heijyaf /+v9cyz *ght of 10.0 m, and strikes the ground with a velocity of 7.00 m /cayjfy+v9*z/s. 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 energy when he runs up a flight of stais kdzw9dpe((e*o +p04o; kdzurs 10.depdd; 9*u+s4o e p wk0zoz(k(0-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a constant velocity of 5.036 1gqyibkzsb; dp7ac7j 29vu m/s. What power must be delivered to g3b7s aq7zvupyk12db9c ij; 6the 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 energ5 (k dwz;)t . c2bbwhbaz0ujr8y are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 742.abhb5 wz;()td k c ubj8zwr06 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 the3 k/glr:g 9 af)siax*(2xy bri rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 m/iiglf )rgkxa: * ay (rbx3/9s2s?

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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 ave4ctdwp61/6wpibr *4 6cphi rfrage power delivered bcbit1c6f6 * prpiw p4r/6whd4y the engine? (1 hp = 746 W)

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