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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 i gduh u 4uw/pb7n8t+j7n SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no motionmjg / dgst+b o3;pm-+v:b8iet?

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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 w /wf nfd::.jeyall, the amount of work you dojd:f:w.fy e/n

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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 an)5 4pqcr h 35frnk;gffd is being held there. How much work is being done in holding the box in this 4; f5rng3)hr k fc5pqfposition?

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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 v9xh4/vz hu-o ola3) ojelocity carrying a 10-N object,h3hu oz4o- /lj9vao)x 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 retea :gvf6wkg(cv9)n55 hy o9rt5gof5 ourned to its original position. I 59h55gaw foon k5g(f):eoc9vgrtyv6f 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 on the 4pp8 wn(74y- izayciw 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 5,9zwwr,c kli the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes z9,w5w rclk,idown.

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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 po9wrpnjf x zd0 2/o*dc1 d8cx7zsition (F vs. x) graph, represents7zdnp0 d co9x/1f rcx2j8wzd*

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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 representsid d;1;lc a 29oqji,ew1 smvc; eyh-pj6r*5g g the work done by the force-dc; l6 5,i ie1;epqda9rc*;ojshgm1vyj 2 wg 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 6jqgxv h4u0 4hmsze+6x4 ayj i0wz++ fobject is positive, then the object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negativ+ef*.t cm6ivdi ;shn 9e, 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 objectrsx0, dp2q h e/1qhm)z 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 ca.4a . si0witd f,qwv6j( .ftxbnj96(jy0h hku r, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared fjw4. 6b0j9adf ,uinhhj0it6t((.x sw vkq.yto 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 cao0zjkte-br 2 zq;42 epr J has half the mass of car K. The kinetic enero 2ezb-q rj 40ezptk2;gy of car J, compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces bpc(5i:oy bsw 1ack with half of its original speed. What is the op5yw b1(si: cratio of 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 pebkjikul igm;(+ l,z27h ble is moving at a speed of 5 m/s. If both objects have the same kinetic enek,;gl u k+jm7ihi l2z(rgy, 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.)iym q12 2wngy0-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 travel1)ymingywq 2 2s 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 distance oeqdb zo9u bif/,//hap, t. (esn a straight, level road. If you had been traveling twice as fast, what distance woul qz(,./9 ,ip /obde/easfhtbud 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 Sun in an ellipj.iikd- kao17.n h *adtical orbit. Neglecting any friction effects, what happens tokia 71jk*dd..hoa-n i 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-energr a-)v( 1dzn.gpj 2nmdrxhn9c5 .6kqjy 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 potential61u1ay9:m l.dy ndwblp qh./b 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 fnpcdegu(0 g r;98k4i yrom rest a height h above the ground. A second object with four timg cr90iyue(8n ;dkg4pes the mass of the first if released 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 t3 ,iel7ury, kqhe end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potent3u e l,7kqryi,ial 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 enhd.jxc b 5sp 0v).x5mqergy 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 pot hec;) w(mrw-5k-bwbkential energy U.--b;hw) kwkb5 (r cmwe

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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 cdxk4,oi)jk ,hz +,vm har 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 zw2z) 1ivi6teequal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater hv zw6iz2eti )1eight?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses e(pxqu)je p (g:yqf4zh+u3ab)d 2*o:e mdz5 b$m_{1}$ 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 conserva;a-xhdse ttn: sg9w(2 tion of mechanical energy for conservative forces9- w tga;s: 2hxet(snd.
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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 friction is t-xqq5k,z1+dn cs l)z hmuz/y2j1( udpresent), to the ground below. How does the kinetic energy (K) just beforez1 nz/m x5,dq zqst ucj yu(+-khdl1)2 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 ignore aiwbcd z z*(-6cenlais0.zv //tr resistance. How muchs a/icdez .(-lv0zw6/cb* zt n 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 potential energ(md5yvp;2d gx:j 2nm ,aa;zlj y. Do not ignore air resistance. How much dmjaxj ;z 2;vyn: ,md5gp2a l(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 endu6jqwvi)i )vl9 y f7 g airot0(+i2s;ergy.
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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 njpd 8)pf2a hzdxq(/3

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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 unitwh(0uoo n 0/cs 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 is not a unit of pof 3hcd-aiyd1dn 2d, -5iy s9prwer?

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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 in one-third the time. Taab4lr;i+t 0/ /ufz vfo do so, your power output +0/ftvl ui /r4fzab ;amust have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the 59cp qiq +ar9lcar'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. r4)h ,-x,ym thac g:pwe2bj)cIf the object weighs 90 N, how much work was bw:x,)2) p -,htccr4ja gmeyhdone in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in xn;p4) prpdm8xy ia rw wh r-7n5(8zb.the air a distance of 1.0 m, at a constant velocity of xhxb4pr8 z( r-; n7n ).pp5i8w adymrw0.50 m/s. 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 N for * u yuo-zd5xapc (m,/ rft2). )flmnvwa distance of 50.0 m. What is ofmpl)vmndw) -tyz c a5u ,/* .rf2(xuthe 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 5500 N for a diskjy-buvk3 ,i0+dfc. 36zf :c)nmtjvntance of 50.0 m. What is the work done by the weight of nj3kz )bytm.v -0fc+3u:jk,c difn v6the 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 upwqw9xj 4d ,c,mx7s.emiard with a constant force of 5500 N for a distance of 50.0 m. What is the net work xdix4sj. wmq 9, cm7e,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.+:f+; q;lkdd(mcizie n*fob80 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 slid/+n9nz v (3ydq cj,fmpes 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 kenm 9cqe2s/ ub y63jb rc0k9,a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle omuj k926see 0 k9c3,/b ncrybqf $37^{\circ}$ 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 a8/a y10 4ox+fnu83rtj uj)yqto, drdof the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the wor3 ty)/do8rj xyn8oujau+rd t,1fa q40 k 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 directiqac5wora 3 dc 4t-sroat:a9 (qw47 3mton of the force. The graph in Fig. 6-1 shows the force versus th7w q:c(- mt3r3cos5tdt94aa a 4qr waoe object's position. 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 objectxhokv vd8,:/ frp w43n in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posith w/okrnv4x8pv:3 ,d fion. 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 ;1kihlqr)7 r; wpp-2hun,c1 lg7 lx vdthe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to g)ph1; lx;w2h7d irlvp-n kqc, 7l1ur6.0 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 ish;pb5co*v3z 5h/bqj .ubm*a n applied to move a 55-kg cart (initially at rest) acruhnbb;*.5b*c j a5/ozq3vph moss a 10 m level 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 0qtf5g 9sq yf54l.walcart (initially at rest) across a 10 m level sul4f5l t0s5 .wgqqa9fyrface. What is the 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 m r)3bsjcex37(wengq9 uch work is required to stop th(g3rqw 9eseb j3nc x)7e 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 distan .cjw-v)a5p awce is required to stop a car moving at 50 m/s under the same conditja-wv c5.p)a wion?

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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 by exerting a forct.p-5 k1pjv t e/cjjp:e of 20v5pp:t.j e/- 1jkpctj 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 componensd gyh8/678ke,a rtl qz1 j4fdt of 80 N and a vertical component of 60 N. The force is applied to a box which rests onra8j1elk / ydqh8dg,zt f4s6 7 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 into a bale of hf*di / d sb:,x90josghay, striking the hay with a velocity of 60 m/s. It penetrates a:jfodb/0,x dis * 9hsg 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 esya4v(-4ad m l8ejh7 7.00 m above a floor to a height of 13.0 m above the floor. What is t(47h-m8vaja sedy 4le he 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 inclined plane. The plane is 4.0 m lecmahatj2 2vj 0nyvf 95ah(i 7k (3)vjong and rises 2.0 m. If the plane is ie2vm0 )c9ahfkj2a(j v3h anyvj7 t(5 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. -3smncxc6ovql8 7*h: sz wf.zWhat is the spring co3ssq- 7z *cc:.flv8mo 6 znwxhnstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m. How much poteniv;)yae4fk1wig4m p1 tial energy does it store, whenyk 1v )4i1im eag;4wfp 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 initially uncompresse2geeofm2*rxc0h 2- top;o /axd spring with a spring 2-2 xom;h *g p2oex actrf/eo0constant 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 stretcccynf7 a .6c7vh a spring of spring constant 40 N/m from x = 0.20 m to 0vyccn6ca f77. .25 m? (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 myy:s5pc, ,l t.dloj* initially compressed by 3.0 cm. How much work is required to compress the ss5l lyjmc,p. y,t:od *pring 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 a* .9 x3yj zifri.b7; thwb8+ 9uikivnfrom the top of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slope? ( vf ba.+iy8tki bh.n;39w i7rx*j9ziu 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 kguwb bjodbr+.t y()h5q.8+j vh , pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting fricu+v5 ).(+jyb8w qtobbj h rh.dtion, how fast will she be 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 inclilrn2,qmbqt rfq,sf*kt4a w)j,p (a5 5ned plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the m2,5qfw a(t , sb*)nkt j4qrfr5q,lap 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 the floor, its potr*tq+*:o .8utnb / sfs fic4ueentia*t rt*4 qo8fb+cu/u s sifne:.l 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 levesp 4d:n:xnlgx2k8 g t(l with a kinetic energy of 40 J. At the exac xp8ldgn24t x(s:g:knt 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 grou) kzqx8 (2h(:p w6 e0sapyoodbnd with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative toew(kp2oop b( )qadh 8 0y:zx6s 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 bottom of .q4lsb2tbp f1x7r( jl ji9 xa9a dip (See Fig. 6-2). Neglect friction, what will1axl(p4 7bfr j9tsq.9 ix2jbl 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 absd bd/,erkfm 0xf2 q(jez(22zj d+ e0t a point 45 m above the bottom of a dixbqd(sdr2(2 kzz 2jf,j dm+00f eb/ee p (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 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 di h620hcl*yscv p with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the sy 2hhlvc* 06cspeed 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 gvfy5hfsvo/)j6l5z , 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 c: -xj.toqfn28p q-u vzm is pulled 0.22 m away from the vertical axis and released from rest. What will be its speed at the bo2:u vo8z-xjqqpf.t -n ttom 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 i h;alf*z:rx,s nitially uncompressed horizontal spring with spring constanr:a fzx,h l*;st of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 k1a log4o)6 nf0f1b hwxg car to stop for a red light. What work is done by the frictio41gh 0o walonfx1b6) fn 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 tf a;wo.tx7l*3:aeov 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, what distance wiwa:a.oo7lft ;exv* 3tll 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. It has 24 Jtfq3e5y28/hpz 2ycw h of kinetic energy. The friction force on it is a constant 0.50 N. hy2ey5qz/8 hw p2f3ct 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 surfvd*4:se 51n.hfka dg nace. The coefficient of kinetic frictde*5 h:1f.ga dns4kv nion 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 m0 s*z-v(27nwtv;(i yuikjpq from the top of a 50-m high slope. If the work done by fricpwv v (utik;s-y n(j2q*i0 mz7tion 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 i e e4bkr+ljry54 y1)dydn)3hynclined 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.3y y+ lre ))54kb1e drdy4nhyj 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 z;sr + ws+26fcsgc7on from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction be7 +z+; 6fwsn2ocgscs rtween 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 ./n/s9 ) mdpqaoqwzl9 a height of 10.0 m, and strikes the ground with a q9pzm/) q sd on.wl9a/velocity of 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 60.0t8,c-usk2dus sdhketbp) ;:g 09 h8 xv-kg boy using energy when he runs up a flight of stairs 10.0-m hig9,8sk vt8dsdx p;h2 su- hbcuk0:et) gh, 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 veloci/a1pt)s t4pmrty of 5.0 m/s. What power must be delivered to the ot41/m)a ptrsp bject 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 fe k dhi/0/zviu x2*wew:ov-*9wb,gvyor 1.0 hr? (1 hp = 746 Wz,0d2wovyi vhb/-: ueg*9*i kv/w exw)

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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 muctqihba+(l- r4qb z-t ,h force does her foot push with when she is t,hb( ttz -+a-q qbl4irraveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 1l jw y3z:ij6x0 to 25 m/s in 7.0 s. What is the average power delx:z3li6 y jjw1ivered by the engine? (1 hp = 746 W)

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