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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,)hm8n w+ recjezsn1digc/ * * 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 there is qxld(+ljeth.qq jno9oo(o0b 84d yxvx*,o 4, 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 asb mfa b/h i/pv9khu9-l+-7f fk hard against a stationary brick wall, the amount of work you dohuaimpff-b/ f +khlvb 7/9-k9

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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 li qd rabju(cau;ya(2rj1x4u8j ay*5z7fted 2.0 m vertically and is being held there. How much work is being done in hoq ca7 au;a 1j8(r4*yu 2yjj(5xzrbdualding 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 velocity carrying8c .e w 0j7lrw4cs4fln a 10-N objenjl4 c .sw7 cr0l4few8ct, 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 vertically 3.0 m then returned to it 2y98trz+b g*sfaynu;s original position. If the total weight is 30 N, how much work was azt*rug2bs 89yyf + n;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 yft9l1d.+rhv*eh5/ d5wf nsptp6 nh lb0la92an 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 straigha png.,s. ni7ft up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity 7gfnsa ,..ipn 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 aru:2ic x4nmfi ph(4.x Force versus position (F vs. x) graph, representsx:r ihn4(f.pmu 2c4ix

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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),9 i a.q -+qmdgxsm2s2h what represents the work done by the 2q9.a-x g mdihs s2mq+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, then the rr;u9gno6 p iti o*6bimx5)cj4ma,imk j+)k6object'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 hp rr/stv e(2pwc- 0h;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 object is zero, then the object wh f fp(e54zzi8qf:p:'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 aitj* c si/4)x:g b3vwoh.lze 3s a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car4* b/xhv:zo .j ws3gliet 3c)i?

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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 hm pt*ua-ui// aas half the mass of car K. The kinetic energy of car J, compared to car K isuaitaup/ -m/ *

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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 2hefiewplq 7u 1z:f5, its original speed. What is the ratio of the final kinetic energy to thhfifu2qz5p7 :e1 ,ewl e 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 pebc.,hm 37eel 7ra4w ceqyksf ;-ble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rof.7cqhakw4rmse 3 ,c7l ;ey-e ck'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 ;/ t.( zpqtbqswith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater dists.(qtz btq/; pance 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 d gt+xl6 hkk6oadg: td p3r:h( m6+bm,listance on a straight, level road. If you had been traveling twice as fam g l :,6tkgtl:6pk3hom d +6xr(dhba+st, 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 mr 6pvm.be rzdwz*77fdq ,ef2-ass orbits the Sun in an elliptical orbit. Neglecting any friction e,eqzdv 27 e.r*zfbfm7-wpd6r ffects, 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 pdu+r b) bxu+g5rinciple.
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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 potential enerct0x y0 jf)s6v3rv ky(gy?

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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 u 7ll/zp yr2g;h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of thepg ;y/2zllr7u 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 spuh)v x:vklq): twp4x 3.;c ohlring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentialqltu clx4okp :wh.h;x v))3:v 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 eney(c y 0)z 2vfsgo )+7rew/pnslrgy 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 kineti ,;; nmduhzc:mc energy K, to its potential energy U.;h cm; m,dun:z

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car driving up a hill2y4/fftx 8i zj.

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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 objehkoj+58 q)lv dct are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whic oql hk8jd5+)vh 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 )jn lw2b1 (uahlv9j 6y$m_{1}$ 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 s.m86fdp(ll8y7aj b*we-mod:zyc2 u conservation of mechanical energy for conservative forcesm.d(l2l* -:6 pfysa zjcedmy8 7ow bu8.
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the air3.lt+gi m, sxfju3 vk/ (air friction is present), to the ground below. How does the kinetic energy (K) ju.svf3xit j3g,l+/k must 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 n tho4h(n3n-y 30 J of kinetic energy. Do not ignore air resistance. How much gravitation (4yh3hnnon-t al 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 potential en2p g3qq:2;5ugk x( ik(qkkyw - 3lnzmgergy. Do not ignore air resistancunkp2xq3k kg3ky wqz;-m(:q g(g 2i 5le. 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 conservation o4o we6vumv24 kf 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 isfo p) ++gfosn ,1wdep,

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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 ofk8 n ajy79su,x 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, whicm+2n2 onp(gg y6:o*lpoq2h heh is not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times th hrw/nh xrw:g d8lw-sb4i53t .e work in one-third the time. To do so, your power output must haw:r tin3rgd .8-sb /h5 l4wxwhve 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 eelad(plra ;k47 .y9k wi+h c,constant 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 verticallyl/+at(,(gnjmbd ;58vavfo ku 2.0 m and held there. If the object weighs 90 N, how much(bvgdf (5kt+j/m;v a8u,aoln work 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 physicsbvokr-gr;aq7+sf x cvt*4 rai:au4 :0 book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of t a4a-tc*fv4:ro ;7aqg uvb+irrks: 0xhe 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 ofgun itmw6w9*q 2o2 ,gtbh:hw8 5500 N for a distance of 50.0 m. What is the work done by the 5500 N fori q2 ,g6tb:h*t9n8wwhuwg2 om ce?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for a distan 3w+w6w8r phbuy.a+wi/s dx-oce of 50.0 m. What is the work done by the weight of the elevator/ds6oa -w+w rb .8w 3puwxiy+h?

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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 5k+rw61vdvr 4n9q6qqw500 N for a distance of 50.0 m. What is the net work done on the elevawkr 91dvrqw4qn+6q v6tor?

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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 alonglvkh9iyctalm + z m4g18t5h :7 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 sliddpt6 w.h3lc4cvo 9ta.yu )c5ccj(m f+es 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 (assume nogyk*t1eu;lyhqixs)1/d (s3 nak :0v i friction), with a force of 60.0 N*/sa iiluxy( vs;dty 1h:qke3nk1g0) at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The v3/ zw 8yfn;wg:z)iu*uz1ty pgraph in Fig. 6-1 shows the force versus the object's position. Find t 8fu/1wnyz* ip3yu ;g:vzzt)w he 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 qaxbtxo7qtp qd t1/y8sj92 3adqo80)of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find 8odxqo8 0aq 3/ajs1t72 y9tbqxdtq)p 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 of the force. The graph i3jhvqc+p i2 qu08cb8rn Fig. 6-1 shows the force versus the object's pohu+8 q2b8cqj v3r0p cisition. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an obje.c9u v8q nf mp;8pcpj.-sqk.;tm q( kect in the direction of the force. The graph in Fig. 6-1 shows the force versus thes-p;;( kq8k8 vcm.cu9m tq..pj pqnfe object's position. 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 + o;c ) ;vduxtogx)skwg ;irb4c) .7amis applied to move a 55-kg cart (initially at rest) across a 10 m ler;w 4+oxcc 7 x)ovk butisdm;a)g.g);vel 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 appliyu(cjv k7 md+2b9)x0 ct j5upsb23kv ned to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the9c3b0+p752) v bkkj(utxynd 2vs ucmj final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is requir3 xbukw( pmyqwa44vulh6 .7t 0ed to stop the mass?47 axy.w kuv(wh3qtm0ulp46 b

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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 mozn 6;w iz,.7glw)wue4 v-rfj)f)j kyl ving at 25 m/s, what distance is required to stop a car moving a) yukj7w weg)l6.frwzfzn, ;jv-)l4it 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 gup4vb-* nv:2ab ia4pbn n propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance p pniaba-*:v nvb4b 24of 5.0 cm. With what speed will 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 component of 80 N and a verticzpxl o+l51*z/kow,i zal component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinezo xz i*kwp,+l1l5/ zotic 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 app pt:8m8y jm3-kp u1d7kmkg3aoj64o bale of hay, striking the hay with a velocity of 60 m/s. It pe 4 3:om6mppkt8dgy j-o 3pkm1pukj7a8 netrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to a he1uf qmus sx+. /,rgq*eight of 13.0 m abq/qxs1g,.* u+efusm rove the floor. What is the change 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 inclin-s8 24 lasf 0wr4daj nk0 5wmfzuw3:vied plane. The plane is 4.0 m long and rises 2.0 m.:i u-faw3j02vsw40 rwmsak 4fz8l5 nd If the plane is frictionless, 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 spring, causes the spring to stretch 2.0 cm. *iz*rhm.k .khe1ave))p; /qy .mt angWhat is the spring )m/n *zt.ha. ;) eeakyqih1gp*rm kv .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 o2ickq+2cf -ec2m 4c6o ugm pp04v:sj wf 60 N/m. How much potential energyum+sw c4q2j02 - ciokcmgpf26:4 vc pe does it store, when stretched 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 initi-p+u( n;w-( cu6 w.2s imktxksk:czxnally uncompressed spring with a spring constant of 25 zuk wcsx+u-(ik nmcp.; s -(62:knwxtN/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 streid5,x4 syfga1tch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m?ysi5a 41 gdf,x (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 compress 0f4r bo*dx0/uqswx 1wed by 3.0 cm. How much work is required to compress the spring an additionqrdwxo1b0wuxf4*s 0 /al 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 slo5jm ,akwt/nrz:/; 3xjm j9.s c6y53wr a vaumape. What is the speed of the slier on reaching the bott/ara xznu tjj. cw,ak;s55mm63y/wa3:mv9rj om 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 theg9 dmq);by j)b.;dn jd top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she );) ddbj jybq; 9n.dgmbe moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottom, it hzu00/dr:/ yucn l cz54 (uvdryas a speedd0(/d 54:vcu/luu y0zz ryncr 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. Whe3m6 mym9b(bca;o6 bf+m 3k *pq pv h8hcf5qu5yn it is 0.70 m above the floor, its potential energy ecyp*cmmafofmk 39 uh 8ypb65+ bqhvq63b5m (; xactly 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 with a kinetic5m4s+g-.g ;)l69iei/ cg hwxdbs jnrx energy of 40 J. At the exact top of its trajectory, its total mechanical energy isgrbxgxe-+cs 6 inlw594m. ;)g/ sji dh 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 kinekq(rdq,xg x8/k 7qsf :tic energy of 220 J. At the highest point in its trajectory, its kinetic energy is sk, d kqxrq(7/8gfxq: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 poins6oy6mlzqtc +(l sx83 t 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed 8y3xo l s(czqs+6l6m tof 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 ofq)o/r6 e ypv/d 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the sq)6deo// yvprpeed 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 above the botj.r8nz(pf g6qx7b ufpca) 8d 7tom 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 of the next slope, w zap f(x7fg nb8qdr8p)uc .76jhich 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 (poirj:wg4 obdk.*3r2s c*uvxeba7 hrl* ;nt

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm,dq;x bxyubh*, nbdv)y0w- l6 away from the vertical axis and released f-bnwq, )b0,u *;dx yxy6dbhvlrom 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 uncompress.pzh7 y3quxypl6 m.+zed horizontal spring with spring mhq z.pyu673.lx+zyp 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 dowwjopqr4n ) bi,5(:opon her 2000 kg car to stop for a red light. What work is done by the friconr4(pi) qo bo jp5,w:tion force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horizontal surface wds):gr 56e3: 1 xatogxc nzo5is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide )zsande5:xg5t3or xw : cog16before 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 onx.tun. uu-q c9 a rough, level surface. It has 24 J of kinetic energy. The friction forc.9 x.q-uc unute 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 ap8thmg lt):oizavb ; ;*x*bh(z plied horizontally to 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 m, what i*ml:a*b( z hi8;) tvbgoz txh;s 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 rhtdno /3 mi-.ep qza-8est from the top of a 50-m high slope. If the work done by fr8-3dtqphmo z.a/n ei-iction 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 f 9 x84dwan6l bu:bxep c.2p3olong and rises 2.0 m. It 3p4u2x:fx.n8p6o bw ad 9belc requires 3200 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 top of a plane inclinea1ii2vq ah 6(xgm 8tj;d at 20e above horizontal. The coefficient of kinetijti(aam128xhi vgq; 6c friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a-ccydt0t 14l f height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it c0y1t ltc4d-f 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 usip pjjv ,cze)qa/ psd93rs/x(; ng energy when he runs up a flight of stairs 10.0-m high, jj9apve3 ;p) zpc/r s,q(sx/d 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 objqkrid.sdthz ); 9d eujp-2c7) ect with a constant velocity of 5.0 m/s. What power must be deliqkde)r;c)ud j9 hdp - 7.2ztisvered to 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 1.0 hp motor that runs 6+gnpg6 k.w 9gj 1qzurfor 1.0 hr? (1 hp = 746 W+g 9k6u.gjrpn1 q gz6w)

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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. Hov6:hc0 4 ose2j6;a t8vrpsbktw much force does her foot push with when she is traveling atshkob4:s;p r2 et6c jav60t8v 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 touj5p;fd4j r s 1d w(uh(c7 k1nox9p,ux 25 m/s in 7.0 s. What is the average power delivered byo hu (4 1 d5x;(scruj7,9jxn upkd1fwp the engine? (1 hp = 746 W)

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