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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 expressed in SI3yu32eiq;tu-.sd aty yl,3 5ya*uvo z 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 az1u;t;ks jg-j6 7wfc x system 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 brick wall, the amount of wozq: 39kke:g hork you d:ekqk9oz3 : hgo

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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 vevkqc6 zr mo(2cq;u- 7z6wd:kdqfb:z1 rtically and is being held there. How much work is being done in holding the box in this pz1u; d6 :rqf(z coc6m kk7bqw:dz2qv-osition?

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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 horizontal3o 7:f dpxq9ah ;ymv.67aksh;w dgj2 fly forward at a constant velocity carrying a 10-N object, the amount of work.sjwgox9 v;;a h2ffpad:m3d 77yq 6 hk 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 is9r (u:jnr6p-e.tfmn w lifted vertically 3.0 m then returned to its original position. If the total we (wn trnj:r m6-f.pu9eight 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 oa8o/hno6 zx2 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. yysxvenmr-wle eiq2kk0-.gl 4,h+(* Compare the sign of the work done by gravity while the ball goes up with the sig-y kvn ge le*xiqrs+-2m(y,w.k4lh0 en 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, a nsbkrb2c*ig j*-lqhw p6u;f+4)od ( on a Force versus position (F vs. x) graph, represents+b6g l4(q2-k*uj*an) bidf p rswoch;

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents the work donejj q492-ms kndu2j/ aq by the forj2n/29m4jd juqsk-q a ce 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 )fe bcmmub+82 9hwq,/ ) :mitycyxip+object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then the object's kinetv)gv0 w46w lvkic 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 zh1 e)vj4ep nf9ero, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twice the speed of th: r72ewdtry8le car. Which 2tl wd:r8r7 yestatement is true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of tq t, vi( *qmmh2mxx5 ,h.(yodcar K. The kinetic energy of car J, cov.m, (m*t (q, h xhtmd52ixyoqmpared 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 p ; q/bjyd.:/-frxnpzand bounces back with half of its original speed. What is the ratio of the fin j r/ n/p;.bdpfyqz-:xal 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 q)hqsyqe-vxv 7.e.3 z and a pebble is moving at a speed of 5 m/s. If ).qqey.3q x7 zvhv- seboth objects have 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. 8,lju0 dlc0 l fhwi504tjz6 kb A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the sam btf6l0 j jz5iw4c0hl0kld,u 8e 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 brakkeap+ g6n+71z lhc5 qmc-vemu-+g:nq es of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car-+e7lm m51ehgc+z+kqunv gc :n-aq6p 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. Neglecting anyivc 1ny1 b1rxam ,jp7fqj8 ef1) 9p9aw friction effects, what happens to the planet's kineti8enmq 9f9 v7j1ayj1xp) 1 af1b,wipcrc 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-energy1d,b h 5yrc n5i1/zdy2xuj*uc 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 ne -wxr8nk9bm:j gative 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 u5z 1,7 gzr)t h3uucegheight 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 the second object compared t7 ,u3u 1ezzgg5utch)ro 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 5.0 cq-acs,6)pe2oackoc;4urzw y6 y-4 zk m. If another 0.200-kg mass is added to the springzp4ws2cu o-yr-ak;)6 eco,k46cz yq a, 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 mechanical vf-u ,jw,(owqenergy 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 potentialxv upvx8mj/6. energy U.j8xxmpvu. /6v

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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 b9 :+1 /j;yqhfernxc+b uz c-6krjm9o a car 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 equailud i,7lx-5al speeds along a level frictionless surface. They both slide up the same frictio uia,7lx-li5 dnless 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 :0m-vosxw,8,d tmhsk mwl685okzvj 3$m_{1}$ 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 o2xz-mh i3-f saf conservation of mechanical energy for conservative forcesmas zh2-xi-3 f.
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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 air (air frictions4a cnn*/ j9-p7 u1jo 2lhgobd g8d: +nupsm0p is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the buildingp*4n9 n capsg01:uodonuj7p 2 bl -g +m/sdjh8?

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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 gai )dk,wwj kii45br n--sns 30 J of kinetic energy. Do not ignore air resistance. How much gb4jd5iw - w-n ik,)rskravitational 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 ener7(dro 18io6 rjo g.n;izg su4cgy. Do not ignore air resist.dgiog 6z18 7oi(4 r jo;cusrnance. 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 of c;53eem; 1 0hf(tgieq xh ht/uenergy.
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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 isged 1*uewv t-(

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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 uzev,m8ma+07m 0;xd x m qeme4lnit of power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which isf m+xlg4zoh ;yr qz0s7z3;qv( 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,uq*:0 j:laf7y n7h bua you did 3 times the work in one-third the time. To do so, you aju:b*:qly n70a7hfur 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 consth(pf 5;q/cdnya:qj.8m bdep y6 q1:ys;(x dqpant 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 7 v7y *akf.xw.ybl vr+and held there. If the object weighs 90 N, how much work was done in lifting ityv7x7wrv l.+yb f ak.*?

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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, at a constanrpnlko ,9z m,7 *bvu -hl*w2dxt velocity of 0.50 m/s. What is the work done by the weight of th7 lb2xmhzvn l*-k,p*,9oudw re 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 upcax;knp, *fky//(n fnward with a constant force of 5500 N for a distance of 50.0 m. What is the wo kkn/ya nx ffn/;*(,cprk 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 ./ frs5dpbgyvzl i6 * -;oo7u7p-ddeypulled upward with a constant force of 5500 N for a distance of 50bdyzvdildy7- u e p.o g-5p7o6/s; fr*.0 m. 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 upwafivey808a 2c/ 5-jctp h.-)hytxoo enrd with a constant force of 5500 N for a distance of 50.0 m. What is the net y8h f av/. o ejhnyc8)e0io-cttp x-52work 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 6nzn(r gc 8zpz d,2.bm5.0 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 +m hm8bd7s bzzbbjvv+,. fv32.0 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 a(k9ryzz y)96 )lgfffpn icy surface (assume no fri99g(rk)l y fzy6 )fzpfction), 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 direction of the force. The (xxu)d q5 uhrox kd,1q0p ,y.ngraph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves,rxuupq5) 0o dq1xk,(.h yxnd 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 obje,h(uk* rl(fmbsbix/9 ct in the direction 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 2.0 to 4.smfb* h/,9bri( kl(u x0 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 directb(qd8 wyp mnfmd,i f s)(a5x.6ion of the force. The graph in Fig. 6-1 shows the force versusnm.(6fq x d 5sim8f,(ypa w)bd the object's position. 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 object in the direction of the force. The gran:-f1px sef48 m q(iu+hyc+ pqph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moc f4him+-exq:u8ysnq p1+pf(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 5v8 asy 5n ykse-l+ yk80uda81b5-kg cart (initially at rest) across a 10 m level su1ks n5 als b88yue-yv+80ky adrface. 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 msbw(c pqp+1lsbm9w6 6ove a 55-kg cart (initially at rest) across a 10 m level surface. What is the final spc6s(6+ml19 pb psqwwbeed 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.i/aehkq*.w0 +f h;bqdd 8ql 7z0 m/s. How much work is required to stop th8qfqehh*dd0ilq ak wb./ ; 7z+e 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 ca l ep+9sknbbj519ose3r initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s undo31 eb+s5bsjk9p l en9er 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 i79 p.jmh *rkcps cocked by exerting a force of9 pjphcm*.k r7 20 N over a distance of 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 8(m2zw(8 o k8ovy6qh hp,ath e60 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and move ywt8z8p(6ake ( 2ovhmq, hoh6s 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 into a ba6 k(.kj bb4n u/ywd5lst;k1okle of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befkl b5;jtbwnsko4k6y d/.1(u kore 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 3diya1id.h(t above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential ener( dt1 yidi.h3agy?

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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 4.0q u r (naivg9kz/q:e*7rou*)z m long and rises 2.0 m. If the plane is frictionless, how mug:urn7**() 9r zuoazq e/i vqkch 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 ahuj a2bq)/ptkns/* hl)wt+ + a spring, causes the spring to stretch 2.0 cm. What is the spring consta*kj nqb2+//tl)+t)wpsh au hant?

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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 she7d2n3*ik3d+,hibb 4anm j spring constant of 60 N/m. How much potential ener4dh* ebdk3nmn js+ ia327h,ibgy 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 requiro+ gnm5 +il jrk+vf9:ved to compress an initially uncompressed spring with a spring+rv5jglv+:mn k i9of+ constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m from x s51 eo7o g(qih 30xgw3-isg0tdb gbu)= 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)qei0 -)3bo u(3gs5x7 wgi01ogtghdbs

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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 md7 onrpaat:ub (o9q+y:n/ kw ,(itt0 initially compressed by 3.0 cm. How much work is required to compress the spo (ka,9biuty+r0a 7:n/ttn(:qo w mdpring 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 a9ve6rep 7b7sg8/:vm c b5sb jfrom the top of a 50-m high slope. What is the speed of 95gssjpbb 76ve7rvc8ab/:e mthe skier on reaching the 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 l.wr:(ty 2q yjmrt+1.h fj4uptop of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 11.yuwly:j m q4+rjf (t2p.rth0 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 z wybbb 9 )d e+cjcj(0+t8;tu j5ug8dpfrictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. Wcujptbj98t +zuw5;+byd j )e(c0gb d8hat is the vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m above thv93-ws *jgnp ie floor, its potential energy exactly equals its 9g3*-vnwps j ikinetic 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 le,4 whg:wo4dq:/m* k,qf vqq7hv q;lbxvel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height dx7h,gq4dv: / q4oq*fq : klvq,;m hwwboes 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 220 stfvd6 s6 fs)1J. At the highest point in its trajectory, its kinetic energy is 120 J. To what v ftfd1v 66)sssertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bonb:6vleki m/r; gg7n +ttom of a dip (See Fig. 6 vg/kren;7l+: nb6gi m-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 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 45 m above t3+u /dmryz u7b6(xqq68bbnu hhe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top ofd8(6 ubnrqyx 7u/6qbh bm+zu3 the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of a n,w 7ie/vv8 rzdip 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, which is 45 m above the bottom78ir/ e ,vznwv of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its s 9bq vb,ba)/(ft 7gkouwing (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 0.21m xnli-g-t1 o8 m away from the vertical axis and released from rest. What will be its speed at 1ni -tom-gx1lthe 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 a k alye r(lj3q1ph+n.;t 25 m/s hits an initially uncompressed horizontal spring with sa (.p1;h 3yjrlqeln +kpring 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 k+w2 9ltwcwqqz( 6rl)z,) ,f tyhken-down her 2000 kg car to stop for a red light. What work is donzlt)zkw)h6 +l-,w,ytw k qr2f9n( c qee 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 a 60.0-kg object and al5ow0l r0z.5ef/ro p m horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before 0 5o leor/5zlrpwfm.0 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 surfacah .. uvj.e/swe. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it sliasw .j/v.u.he de?

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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 levn ,:nasc9h5wc el surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is mn nwc,5cs9h :aoved 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 top4o5b-g x9lstxe0bz +7ojqp bgpk6:; x of a 50-m high slope. If the work done by fricxg +sx:e 9xktj;l4 7bog6zpb0 qbp-5otion 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 pi.tjln0at c8(8zr suc*j 18edlane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to cn8it ar.e8 (sdc10zj *8jutl 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 -ds/ n k;i;-;un mhvl1xr5:lvsg;et qrest at the 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 after sliding 4.0 m along the p;:/i gnxu;;eds- lrhnvvk5;tq 1m-sl lane?

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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 10.: ++rf cbxnfc0vi;f-;(wet. hn5 lndq0 m, and strikes the ground with a velocity of ;x dhw5bf+cr;f. ti+ nql ne-vf(0n:c 7.00 m/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 e+ktci -z ;9cqqe *x0lwnergy when he runs up a flight of stairs 10.0-m high, inck eqq; tx90wi +lc*-z
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 5.0m )m8to- sw gd4nqmg9,5llp;c m/s. What power must be delivered to the object by the force?)5nw,t-s9cpm;dqmlg mlo8 g4

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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 hc0h f2 t( 14n+gjr,qshdx1iqthat runs for 1.0 hr? (1 hp = 746 Wh0,dgr(+h tx2f1 ischnjq1 4q)

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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 forw kw1zf m+,c/ jr3g1u3qb/mwk ce does her foot push with when sheb,jr qc+1mkzuwfmwg/ 3k1/3w 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 acceleratm+ f. 5huewboh80 qli1nx6;umes from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engineiu5.unhx10o wqm 6ef;8hml+ b? (1 hp = 746 W)

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