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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 u.p/iwg19t- bkap5zx unit 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 tiiv:4ykj3 5dgz ib 4sief c0*.qry2,khere 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 po i-3s : k*q9rb.6k w51ikm xfcq+nkg5z4unkstationary brick wall, the amount of work you dfqgc1r .z-9mkpik 6ko: ni5u xbs5wnk 3*k4+qo

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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 and is being held there. gl(bs ndi5ztzq )+g41*.enm9y sc*qu How much work is bei4z*bym lsd1 qcs )tu+ng( 95q.niezg* ng done in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a const-o6 yai6:r u+s5fishdant velocity carrying a 10-N object, the ami6sd-fayr:hu o+i6 s 5ount 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 ve: rmnb*) kl vt8mz73hwrtically 3.0 m then returned to its original position. If the total weight is 30 N, :7* z rnlmh kwm8b)vt3how 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 tqgv6,f jm*i1ka; ut r8he 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 str 2j0 ,6.mzoqnqx4 /o(uoyzh0w cyriy9aight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work don6 rw z2(cz yy,qo/0mx0.9ooij yhn4que by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. u3o( +jxr:hf ux yyu x)),7zrex) graph, representsur ,3)7yujurfzxx h(xo :+)ye

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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 versusga)(9jux2*- 0zm)yswswsow p position (F vs. x), what represents the work done by the f0swygm*) wajsp) -2 (9woxzs uorce 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 posvxftb 1:y 2; bt52yhknitive, 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 ob(lh4x/vt: y(z ad)lbq5, y boyject 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 w tv9)u8uqu;s:p3gxl on an object 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 carl:nhs/jf / dlez; wg49jo-cq.q4l-d o, and is moving at twice the speed of the careq -jfg4 4d;-:o.w /hqcl 9nojzdsll/. Which statement 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 ca4 sjx0ub n27otr J has half the mass of car K. The kinetic energj btxno42u 7s0y 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 back with half of itsgg7onbb, h m2m auw;w2:c/v y3 original speed. What is the ratio wam 3m2bcnv7 ; wg/gy 2hu:,obof 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 g80;m2. yaokcfzk vm -pebble is moving at a speed of 5 m/s. If both objects have the 8a ;kg-o v20kfmmc.yzsame 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 mass is moving with hb7abx ry;l0ge:m0fpj9)k *uspeed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stoppx9;ka hr0y b:j)eg07mpu bfl*ing?

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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 inpg+7 a ha ) ys9/9ba(ey;mrptu 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 have skidded, under the same conditions?mu ;a)/ ayrbap7eg9h9 stp+y(

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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 theo6-k.5lr6cwhli ic 9y Sun in an elliptical orbit. Neglecting any fricc5 oric.kl9h-l6wyi6 tion effects, 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 n7/(nmik7 j k2.cvm coprinciple.
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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 potentia 32f(ytf5bps epu xk:0l 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 restyt5qzlv b552n a height h above the ground. A second object with four tbn5qltv5 5y2zimes 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 the end of a spring causes it to h+utt agf+4/j stretch 5.0 cm. If another 0.200-kg mass +g+taj/ hf4 utis added 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 mechanical v1;;: z 4yqea dl,ycangwv*f2energy 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 tr5hxrpoi5a aqi7q* /f9ee. Compare its kinetic energy K, to its potential energyhop /fiiq5arx 7*95aq 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 orlum48*g n /ltf 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 equacrj:sx *n5nfza l*lu; vy -e+3l speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater heixuy cjrelf *3-v :;*n5n+azlsght?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses x 0bm 2*3wb,vz j:ryjb$m_{1}$ 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 energyluwp/ e;t u5.j for conservative forces.tljwu;u 5/pe .
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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 2n.p)kz: rmjr, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking thzmk:n. jrr2) pe 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 energacqcd3-43hncy g.4siy. Do not ignore air resistcdyc csna q3.- ig443hance. How 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 distanc. t,cettph: 9te and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball g:t,ett. h9ptc ain?

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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 bq2/fq m 55bxw(rxu7t;:xt c+ tt fd/zenergy.
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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 isymh-r +4 zn-fa

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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 qybq2+gjhj 0qh)rey lg,*.u (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 unifvx0j5 g(g mo,t 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 3d 2w0 2to/vilx/.p jf mgft(2+hwe1gj times the work in one-third the time. To do so, your power output must have be2xifh t1v.(fegd2t/0m 2/+ w jjpowgl en

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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 cac-4 +q/chvsns r'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 xinnpw( *g v 2yzt6d;.2.0 m and held there. If the object weighs 90 N, how much work was done in liftitzv *i(nyp wn;2xg.d6ng it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distancf: 4z)dqtltd7e of 1.0 m, at a constant velocity of 0.50 m/s. What is the workqztf d7t:l)4d 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 withn zzb:gr7pv,+okn ;e1 a constant force of 5500 N for a distance of n :reov gn7z1z+kp,; b50.0 m. What 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 upwarvs4 nz5levb,pu0:g 6u, od+k kfz v2u7d with a constant force of 5500 N for a distance of 50.0 m. What is the work done bygvv l 5:s4knouzb eu+ 2p7 k6vfu0,zd, 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 55c scn;+hk)e5)jfw9he6x n6 kr 00 N for a distance of 50.0 m. nx hkekn9 swj rh6;) c)e56cf+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 up along l0jlv w,kub luchqhx37c3 /(if xpj/:,2 ps-ka $37^{\circ}$ 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 8.0 m dd1v jt8jy:p3jown 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 ytbyt(-dzprg )-.hou 6ql to4 )du/y8an icy surface (assume no frict p)du-yqt o/(6u8t ydor zh.)4y- tglbion), 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 grapsnp + y)7iw-i7tds ba1h in Fig. 6-1 shoapd+ys ts ni-7iw1 )b7ws 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 obj3e, nmb ./jeb.uqq ,gzect in the direction of the force. The graph in Fig. 6-1 shows the force versus the,q nm 3 quje.b.g,/zbe 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 obje sfllig /h2r:z;hrazm :fur0yd/9 , 7tct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's positiof;zuitl9sh2drf 7/: :0h r/,ygra lmzn. 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 direcoy5:dvqoe8+poz ifg;w- v l4, tion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work don q5o -v zfipv+:y;8log4od,wee 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 20o7 fekr4l,-p 0seb -sjz7a(sj0 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of t(rjjfosb7 7 -aze e-ssp 04l,khe 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 cart (initially at rest1u-bfhb*2ehk v+v yn.) across a 10 m level surfaceevhn2b.* +fuy1bk -hv. 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 much work is require+n 2r (ic)odned to stop the mn c(r)d+eo2n iass?

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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, ap jb7xn m2om s*c(4z9what distance is required to stop a car moving at 50 m/s under thm* n( m4apzco7jxb92se 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 gu ) :yg*muqgkd7n propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leag u7:ky* )mgqdve 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 vhl+s cs *3k2wtertical 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 alon* h 3lksct+s2wg 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 09 /ytv ylg 2wcy.d 9;o(xoehka bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stoppingy 9ox2ycgko9dh;le(/.t 0 wvy. 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 d8 )si p,5df 0ap/tqhm77igsi m above a floor to a height of 13.0 m above the floor. What is theg0td5ma/q s78 )d ih 7p,pfsii 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 anp3: iwk1 p/l)komq.nt f-.jpmr0 1ahnd 1 )coi inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much worp 0infr ko..-w np/:1 ommcqhp)kt 1) adi13jlk 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 springqkw9x9r y6kj:, causes the spring to stretch 2.0 cm. What is the spring constrxq 69k k:wj9yant?

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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 9xvh.fc f.4w qmuch potential energy does it sto .x.hqvfc4f w9re, 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 compisa.o6 l ;n-lskt4uy6ress an initially uncompressed spring with a spring constant of 25 N/m by y tisu-6k.a6l ;l o4sn10 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 = 5zz)p+tsyj t1uzc*z50.20 m to 0.25 m? (Assume the unstretched position is at x =5pzsz tj1 cuz)* +y5tz 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 -p1n:tx kti(l- (uxkecompressed by 3.0 cm. How much work is required to compress the spring an adde-tp: kx(-1u xit(nkl itional 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 +(06a 2a9t ysshhi hrufrom the top of a 50-m high slope. What is the speed of the slier on reaching the bo90ry2ahssh+u6i(t ah ttom 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 top of a hill wit1nrj5 h)u 0xhnh an initial speed of 4.0 m/s. Neglecting friction, how fast wil x1jn0) urnhh5l 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 inclined plane. At th+ -rbn1kkz0.fes a 2nge bottom, it has a speed of 9.80 m/s. What is theak2.fk0+ n r1bsgnze- 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 the floor, its popu*roczbfq / 8v ,rp**tential energy exactly equals its kinetic energy. How fast is it movir/ * b upqfvcz*o8*p,rng?

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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, blasthmmf4*,( gvxzh sr;r0s straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechafsr0mmhrx(,;z4* gv hnical 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 g(o0 (n3y2lhveoqe 7,4 snkrtnround with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what verticl0q 3v(n7eon2o(nsr,4 t kyh eal 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 bottom of a dip (Seemqt mu2y,l-zva1 ;3 my Fig. 6-2). Neglect friction, what will be the speed of the y,lt2;v-m z 1muqam3yroller 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 wi y.ivx,rw2mb7th a speed of 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 speedv.,w yr2i mxb7 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 dip with a speed )osviiy9nyffi; 1+ 3rof 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the iriif 3 v)yn91y+fos; 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 ft y,(fj2xz el-b 783gmjno5izyq+h1use, t2speed of the ball at the bottom of its swing (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm / qqe4t 8;j;q.btd:lork d fp,away from the vertical axis and released from rest. What will be its speed at the bottom of itsde;bq4d o.kq,p ;t/t:rfqj8l 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 initially6m( svd /kdhgtpbvcp , 3 s;(1ovmq,-h uncompressed horizontal spring with spring cons c3m ;vm bhpk-ts,6ddso,g (hv/1vpq(tant 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 p4afe4nx (mob51 kfr) down her 2000 kg car to stop for a red light. What work is done by the41fpr o) fake5mb(nx4 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 frictionnoy98pwl*x1) 5m iheo force between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed*wy89p)l h 1xo5e noim of the object is 25.0 m/s, what 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 rough, level surface; ;2b owy(wlgpio4 mv:. It has 24 J of kinetic energy(p yg2 voilwo;;mw4: b. The friction force 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 appli 0yr n pd o*lmhpzv7)94/ems6ved horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surfmyn)4zs *olv p79ed rh6v/0m pace 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 sl eqdz4qgz:yoa6 iylkxl ln:w.me :)n6 o91/9 qope. If the work done by fri9 kne) qodm6lnl:4x9q6 l e::oiqga1/w. yzyzction 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 i 8ddo 8e0wzylwlhd q f18h8.z1s 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 the magnitude of the average f f81l818 ozyhwwelhz dq8.d0driction 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 )c,a/k/or 4t(b u ;alo io;zawgba 8v4plane inclined at 20e above ,v(48wz4/au;c)/bi oa; oagatkbrlohorizontal. 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 plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, csxvyi5e pha(1 kf2j).4bvb2 and strikes the ground with a velocity of 7.00 m/s. What average force of air c ek4)b5p.j2asbhi1vx2 v(fyfriction 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 +hz)otr p-6b rwhen he runs up a flight of stairs 10.0-m b )z-6to rr+phhigh, 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 neede+e*z-6*z+ky taqr ve md to move an object with a constant velocity of 5.0 m/s. W+z m yevq*6e kztar-+*hat power must be delivered 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 b.oq4kyzj0 q (p ud/,ci9fxm e0y a 1.0 hp motor that runs for 1.0 hr? (1 hp = 79, 0qkjdie/u pz 4oyx .cf(m0q46 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 the rate of 500 W while riding. How muchl-7 pdd +/ jpzfg;g/6kq. avrr force does her foot push with when she is traveling at 8.l+a d;g-./7fjk qp6z/ grvrdp0 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 to 25 m/s in 7.0 s. Wp8 jxd g/0c: 2uf4obom;qdc9phat is the average power delivered by the pofom/8;jqd u bx2:gc4 p0cd9engine? (1 hp = 746 W)

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