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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 SI units-e .vuay1cz* n?

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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 motiokd+ j)qs6);7wfpbbkd n?

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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 sesemkj) dqza1-1w -3q tationary brick wall, the amount of work yok zmj3qwde-sqae1 1)- u do

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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 bei:phjj eut/y8: ng held there. How much work is being done in holding the boeht :pj: j/yu8x 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 carrying a 10-N tuszo c,emu0:, i7u3yobject, the amount of woo:,uusyz 0u 3c,7mt ierk 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 i2gg4vg 6gmm m8s lifted vertically 3.0 m then returned to its original position. If the total gg28 v 6mgm4mgweight 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 nk3 )bbwjbh +:tfp h z(+aw.9 3fp9qgtobject?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the workl0cyl+cg b gas1x *69t done by gravity while the ball goes up with the gt09 sa *+ylc 1lb6gxcsign 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, on a Force vehw35ihm7 xg ; si9al3qrsus position (F vs. x) graph, represents h m;isg9h735w3 ilaxq

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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 i1m* k,udr nb sj5a6d7vs. x), what represents the work done by the fd6mab7i,1d 5s ujrk*norce 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 object's )3*c,gj2 u4trpdpmj*ut6 fc ykinetic 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 negat5j (b81ta*9r hynzc ;kg*-wl;dg ns fbive, 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 tzxrg3e 63c+ aqhe 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 mov5wh+bgeuidiw 0 -;wb yar4c-9 ing at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the g-5wbiduywwa0hier; -+ 49bccar?

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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 asccp5pfxy1 l /* yb1:gy fast as car K, and car J has half the mass of car K. The kinetblyf p* :x51y c/cgpy1ic energy 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 its origrcxxp0*:he 9 ginal speed. What is the ratio of the final kinetic energy to the initial kinetic enc pg 9r0:xhe*xergy?

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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 pebble is moving ju6- joir h3m,at a speed of 5 m/s. If both objects have the samerm ijj63,u-ho 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 movin v(yp1. *p0yjap zzi(fnl -w4qg with 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, andji.0l-p 1qzw((zn4f*ppyv y a 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 brakes of yw*e 3)h : bjgaytk2c4gour car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fat :*3hkj g2w)ey cga4bst, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbitn2n(+zo odb .qbg3d h4s the Sun in an elliptical orbit. Neglecting any friction effects, no q.o2h3(z4dng +bbd 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-energyl0 eu2nlv4 y;d 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 2 cz)jnn 9zcr*/ ub p6/8hpxispotential 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 releasedzy4h(ue0 qafc e 2x3+p from rest a height 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 seconac+ep x4q ue0y2z 3hf(d object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0:bh/v sk 8t.jdkzqy.+ cm. If another 0.200-kg mass is added to the spring, the potetd:jz bk8h.v .yks /q+ntial 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 energy of 6lmn3gv6 0ign 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)hvvy q 2yn+nyat:m-6 K, to its potential energy U.th+y nmy-nv 6v)2 aqy:

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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 csnoe .t3 +c c+a2xi /h2t/zkclar 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 oebo4-ey0p4 f. uo)ko and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the sa o40- eu o4.ebofopyk)me frictionless 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 (pu,ls(/, bb+c3khbwx( g i9zy y d*ub$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of conservation of mechanical energy for conservatn ud. keksh:v;d8s7)cive forcesh.udk ;7 d csne8:sk)v.
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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 fri wtcn08n hs4;mction 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 top4cm8t s0nhw ;n 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 vle-n6hp )hxf/gmo4h e91ci/ a j8p2uenergy. Do not ignore air resistance. How much gravitational potentialh2xcu )ha4p1/8gmifo h jvn69-ee/p l 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 ene 5yogzdn6.amz0s qdib6/l8.orgy. Do not ignore air resistance. How much kinetic energy did the ball gain6g6 qamos /oy.ldn0iz 8dz .b5?

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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 e dz.pnpa.b0 0tnergy.
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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 iscz:q 9jva0 sa0 j/wl,x

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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 otp1 xc 62. n dyi-0u;ppawmec(f 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 poweruluw0c5; hma5?

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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 timmcby:pbz4 y;qk8-n)z e. To do so, your power outpucz)yk ;4bzp 8mbq :-ynt 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 constant acceleration,+yb a *0)ecmwu3+sw / c*cdmfc 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 2hodnn9lwn.+l60 uf4 g.0 m and held there. If the object weighs 90 N, how much work was done in liftingnlwlh + 6 o.0f9nd4ugn 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 distance of 1.0 m, at ad *z:,r,y9 zbeao(a qs constant velocity ofd qesa,bar*9,(y :zoz 0.50 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 a do hjjnvl*vdv ejfc-(.hp 5 -v4s7b)/ gistance of 50.0 m. What is the work done by the v l5*shv(hjnd.o)/f7 vjbej4-- pcg v 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 foreiym/pzbb .x)ot+ ylq ;/9u)9qwues; ce of 5500 N for a distance of 50.0 m. Whatuuy ei)b /o p9se/.;t+)xql9;mzq wb y is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a i;9:ry b6bsilx dt d(7constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevatorli t9i b(6;d:7xrbdy s?

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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 .,h c pzoyx/;eowg,r-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 fruit4(gnfrb:q9m sw 43o al slides 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 /xvx6)hh3 gmcer+s z2 yx-wd7d j0l 1(qd3ynbon an icy surface (assume no fricshe3h-dqxx0vd( wrdc g7 l+j)/m 63bn yx12yz tion), 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 directn 07wpx++e ,jsi tnm.yion 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 fron+e+yjpns .0imx w 7t,m 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 0/o8bqso +vt -sil4svof the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh v8t4vlob+-s0/ oqs isen 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 h(r7 veuwh eakdr-d :zvk4.8 6force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6e(.h euv8r kahdzvkrd64w -: 7.0 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 topkzii :u2.6 graph in Fig. 6-1 shows the force versus the object's position. Find the work done whenkit6z. u2oip : the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is appliedh:8stfztncd*- m1 ujl))z 4 qi to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinc* si81):ft lzq)4 dzut -mhnjetic 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 5ew2e4g gv( sbis applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the ew e4(bgg2s5 vfinal 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 mw;0z*4 sujsg euch work is required to stop t*j;w0 zssg4e uhe 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, whlyd2m7:iz0 : rpfs*ghat distance is requirgsr* 0m:7ldf zh:2yiped to stop a car moving at 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 gun propels a 10-g dart. It is cocked by .9 frl:ch-v hrexerting a force of 20 N over a distance of 5lrr.f:h9chv -.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 verticaykh85ncy) ,b xl 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 kinetic e5bc )y8hknx ,ynergy?

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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 hay, striking the hayp 5jq/ n-/z .)ubar4lon*+ n yntnvz:k with a velocity of 60 m/s. 4vb y5o k qnn/z*jprz+: /ntln-u .na) It penetrates 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 chkr4*xp8d p1b;a xa3 a floor to a height of 13.0 m above the floor. What is the change in gravitational potekx b;p*x14 hra38ap cdntial 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 incly)nut4sj4;b8lvdce 0ined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the svutdnl)4b;40yj c8e 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 spt9bi) f2s0ds z9u ;lqjcaw 6,hring, causes the spring to stretch 2.0 cm. What is the spring cons2i6zuw9a0c 9h;qtb)dj ,l sfstant?

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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 j 8t81lms1slj5g,eb.gw2raj spring constant of 60 N/m. How much potential energy does it store, wsgl2m5a8t.ws8 bjrl11,gj ej hen 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 d4wz maz46 6fpbgp: ,wjfyu;2 sf2f7vdjq8n+ initially uncompressed spring with a spring constant of 25 N/m by;, ybdj v4p m7naz:f6+fjsfgu2 p w48dqz2f6w 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 sx2 n,u d1kos7+vp1*s.i xukllz w lq(.pring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the u1s.1zks+n7l k.pxuiow ul v ql*,(2dxnstretched 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 compressed by 3.0 cm. Hm2oih 5uw- nks.hl v,,ow,2hnu m.i ,lo-s v5khw much work is required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope. What is the s,l-*o uazcmt :peed of the slier on reaching the bottom of the slope? (Negl,ulz*:-co amtect 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 a7h,cuuv1e rta c ;j.9wjwcp) h ()ly.f hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after drfcr7uy9wv ha.we,) cct(l1p;j .u )hjopping 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 si9f *s0dyz1 mfrictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the pysz9s*i fd0 m1lane?

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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 isi; ,7igc8h6 idhn:l:qpv l+w7okj( po 0.70 m above the floor, its potential energy exactly equals its kinetic ener +io ;76pdnp7how klg( q:jvcl:,hi8igy. 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 1d yqo82r 91s9jly4qrj/o oia/0 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heqr4aqs i o 18jl/r2yo9o y9j/dight 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 withwq *kbb8nx1i 2 a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, reli8bb2x 1*qwknative 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 dipkz6.l2q0 t,tdb: liyb (See Fig. 6-2). Negl bt:t0,.blqikd2 lz 6yect 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 tuhpn e8:y48rbu +pja9 he bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope pue nby948rh8j:au+p , 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 1)c31wav,+ij hxccqh*aa9dp a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top p9x aha) c*+avhcc ,d1j13qwiof the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at thetpcoidi 6 x7*+ 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 pulleiq 7o10k(dtfp6 ju:jed 30 cm away from the vertical axis and released from rest. Wha67i tkfj1pq 0jode:u(t 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 i in.xei4 r-a+4xi tur)nitially uncompressed horizontal spring with spring constant o - xr+4urnxeii)i4t. af $2.0 \times 10^6 \; N/m$. 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 au iv4gzt9dkv2 3fnf;(q ae;i 9t 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done29inqezk(v ua;f i4; vg3tdf9 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 a horizontal surfactlb r8a6 qq5w2e is 50.0 N. If the initial speed of the objec5 q28q w6rbatlt 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 roe/zu 6f 4xu.l1-7pln0chgfqt ugh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant lt7hpngf.xfeu4- q 0zl /16uc0.50 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 applied horizontally to a 2.0-kg mass on a level sur/xtn4b eqed( d d(o1n +h h3*2smutao8face. The coefficient of kin(tt+24u h 3a8sx m1 oqo(d heendd/nb*etic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slh;jwzoh;i2d +wox/;f ope. If the work done by fric;;fjio/+ dz;hwhw 2oxtion 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 vu (hjn ke5tqszbo-:la,-1- jsm f;p7an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to ge-ovs;q5 kj1u- fhpn-azbtl7s ,(m j:et 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 plabh 3x.) m 7lkv r0pdpg;*aiv4 sc4cl1one inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will bevld04 4m1b c7c3g*ar);holkxspiv .p 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, and sfn+ by(:b y9t0ek68t csrs rb.trikes the ground with a velocity of 7.00 m/s. What average force oftscf r6ybtbe0skbr. 98 +( n:y 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 60.0dxc( ala(no 7-ri-y+nzaan4c a8.*eh -kg boy using energy when he runs up a flight of stairs 10.0eand8c*n 7n -+o-zialr a ((y4axach.-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to m*c6xap i 9ckh4 0(otwvove an object with a constant velocity of 5.0 m/s. What power must be delivered to the objecia w *h opct(906kxc4vt 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 moto ( 2w7(szjd0gi hqp9htr that runs for 1.0 hr? (1 hp = 74( jwtdphg qh7z 2s(90i6 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 y/:6pjwy m,dfs k)kk 5of 500 W while riding. How much force does her foot push wimy)spy,j :kdfk k65w/th when she 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 accelerates heb-p qbk41n*9 1ym hofrom 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746m epn 1yh1q49-bkb*oh W)

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