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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 exprepi*c,hxa y9oyjy (n0)a07hr dssed 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 sys 0 p/e gs/2 ,+bumcalusf-7n*tgdskp )tem 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 amou yz *xia/r xk*)g smz08a)9dfpnt of work youkd9x*p fy*rs)zi8za) xam0 /g 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 being held there. How much wob 7 3ake4 p8*e1cjywyzzj2(mj rk is being done in holdije8j1(wj2y m7ykb*pec zza43ng the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity*0 o;k-ayxa o izi7cn- carrying a 10-N object, the amount of work you donocozi*- 7x0;iy aa k- is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to itf8u/0ved i6c qs original position. If the total weight is 30 N, how muev8 diu 6/cf0qch 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 centripetalr ixbc;.gsx2 k8 vh+aks::0 fa force acting on an object do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight upkpd2h//qi p q4. Compare the sign of the work done by gravity while the ball goeshi2qp/d/ k4p q up with the sign 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 versus position (F vmjr,t1b0 b1xs s. x) graph, represents0x1tm1rb ,b sj

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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 th6:n3s r nnncnt maz36:e work done by the for m:tn s33cr6n6naz:n nce 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 kinetic en 6 nnl205 hlebe+z:fw 3iajs r7sb*3paergy

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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 anhz6+ vny;0r ky object is negative, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is6-7 j h0 au w)tz7:gxgrd)ndp b2ub*cq 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 muchw l4t cqx.0je rh(ge02 as a car, and is moving at twice the speed of the car. Which statement is truel20. r04 t x(qwejhgce 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 car K. Thluqht0b ;) 6hpe kinetil th0hq up);6bc 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 oriitc q:ol)87hz ginal speed. What is the ratio of the final kinetic entqi:zcoh l8 )7ergy 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 i qmpac2,o2/6ulrl.vb(vy i sq9h2sc/ 4pl+ tm/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's/v /s.4atsm 9iuq22 pciprlh 26c+b(o,yl lqv 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 c,: /(qmwzsccwith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stoppiq (ws/ m:cczc,ng?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a certain d 4qxc1m)* errmistance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same condition1 emmq c*rxr4)s?

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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 ellips4ibgr z51i9qtical orbit. Neglecting any friction effects, what happensiirqg59 4zb s1 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 prz iqpw)7u2 +nwb)n :4v0 sgh 6tzi6hdkinciple.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have negative potential energy?bin2yz mrqw8cp,/v:8

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h a2c oc (aeh)i9su9+w ijbove the ground. A second object with four times the mass of the first if release cahwj(9)u eio92c is+d 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 ajyhf3rkaxsx 6em..s78 :jr:d spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of th 3a:8h6 kj y jf.x:rrxdsme7s.e 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 y ngb;c ,.l 8u3x:nlyvenergy 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,6)p(a, zg i3p qws 6vfz)b5zh -pvtzt) to its potential energ6 zizp wp ,(6fqv5t3pzv) g)zbat-)hsy 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 of a car driving up a hil qe8jpm b042vul.

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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 slidnlmh nsad/ x54uk (/-hing with equal speeds along a level frictionless surface. They both slide up the same frictiohldxsu k 4an-n/5m/(hnless 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 3zn4r1/e msor/ u,arug zj ;,h$m_{1}$ 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 conservajnisd3z k .ouik1 -v.c78yrqw/e e45ttive forces s7 oinkz eqtv8/iry.-w3jc1 k4.e5ud.
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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 :st(4e93zp bcui7sl wsv .0tra building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at tc.i9br3ewvultst:sps4 0 7 ( zhe 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 ;c if; vg gtdof(f))f030 J of kinetic energy. Do not ignore air resistance. How much gravitff i))g(;vto0 gf;dcfational 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 oc+z0 3:a6dl:6 c p kbjwoe9ptef gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball +c p 9j6bt:eko: zwd6eplc3a0gain?

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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 energy.ykitgfx ;0.b 8a*ve4x
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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 dih/:p5 a /z*pz0ajq8tv4cpl

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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 expjrol 8.e *,y5dd e7wvcru,,lh ressed 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 aq/n.zq (1dffof power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times the work 7u rhrng2f0iecd;+l* q ,j(6/ u un,e(f ctxmnin one-third the time. To do so, your power output must have /cxm7fte; ,q *,rn0d( 6n fu(rluhg+cieu 2jnbeen

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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 constanjdjz w3 .uqp*v*bff(5t 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 and held there. If thu 2vio o7hcylfb 8w+7.omn27 e9 yohd.e object weighs 90 N, how much wob w ceo oi. y2o.vhyu8l7h72mnf9od+7rk was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a dis59bxh r h+uo4 ismn4oll*: t;vtance of 1.0 m, at a constant velocity of 0.50 m/s. What bl+9 n4mxh5truh:os l 4vo*;iis 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 constan mrsglb.4b- )rt force of 5500 N for a distance of 50.0 m. What is the work do .m b-srgb4r)lne 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 mj(/(xqib9 ni distance of 50.0 m. What is the work done by the weight of the elevbq(n i/9 xmij(ator?

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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 is58pg b+pyfur6mct/ .vi-v k1r pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is th5m f8k vrb+1tguivrp.6/-ycpe 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 ale a4v.em.bp- v 8 xql4/1u ljin4t,xmiong 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 8.0 m down a ramp,dcw: knqr:ha7w lxm5)h/,x( s inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy surface (assume nc*q.; vtzf m*uo friction), with a force of 60.0 N atqcm .tu**v; zf 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 graph in deu6e e vo7ybl4tdl;x uy, 1+,Fig. 6-1 shows the force versus the object's position. Find theexuo +etyl,14l ,;ey67dduv b work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph-5o noicx+t*r:)5zimtw,lt,6 g scut in Fig. 6-1 shows the force versus the object's position. Find tcl+o m:-)* toiw,n5x,cru6t5tt sgizhe work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Figqr2c7 2y9tld ei/5u bg. 6-1 shows the for l/d72rqy5c i ue2bg9tce versus 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 th.ahe 0- s7uxswxp v34ie direction of the force. The graph in Fig. 6-1 showe40swsxx- i3h v.a7p us the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 Nj hscdmug6fo 4;58gh1 is applied to move a 55-kg cart (initially at rest) acjh5 hgg8sfcdou46 1;mross 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 cart (initi2zhj;b/-wn a lally at rest) across a 10 m lel nzj2w-;a b/hvel surface. 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 required to1y:( ir fvqjd:3syy6rfr 5.wx stop the mass? :1sxdfiy5:3r y6wr .fyvj (rq

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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 distance ijnm,a +ttq bzhod jk ;(lyjkuqm1 t0+53d,(3 ds required to stop a car moving at 50 m/s underm+ z01tj,u(j5( oadtkqmy,lt3q h3n kd djb;+ 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 a5y e8 w36iblcr 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 leave the gun, assuming the spring has negli6w3 85ecir lbygible 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 vertical componentncf.)rcw t+/u 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./n f w+t.r)cuc0 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 hay, strikindmf hnvhq; +c2v/ (zyq0 i)q4::tbkzrg the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whahr:vk0/cq hz+(iv)d m;4:z2qy f btn qt 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 fromqe gbnb.(x;6mt 9ya:g a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravb ygg:e6 (a;x.nmbqt9itational 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 long and rises 2ozjvxu70 e 1bocc00 j4.0 m. If the plane is frictionless, how much work was done by toj 0uz0ec 1c4 0bj7voxhe 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, w8m, iv ql3ac.causes the spring to stretch 2.0 cm. What is the spring c vi, l3maw8cq.onstant?

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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 N6o+hakc45g 8 y ns7ye5.iesqu/m. How much potential energy does it s 5knsyy 4.chg5u s i7+6e8qeoatore, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompreja.t* k 9fms;:,om qttssed spring with a spring constant of 25t,mfto tak;:m* jq. s9 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 pe;2 f/nk f)br6q0oar stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the u;o 6bepfank r0/r )2qfnstretched 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 ecdd9zvrh,4 ;is initially compressed by 3.0 cm. How muc4zddvhce9r ; ,h 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 thesusn2( - mf-yz suab32)z/mry top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frimus(zbsy/z)2rsu2-may 3n f-ction.)

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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 with an initial spenh3-oq8o e eb:mtt, :bed of 4.0 m/s. Neglectioq be 8m -,ob:tneth3:ng friction, 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 inclined plane. At the bottom,wph+gs3a:t: fp *z2l v it has a speed of 9.80 m/s:f3*:plg+vtazphs 2 w . What is the vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor szs(bl:psm: .. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast i :l:sbmps(sz.s 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 g v)dmx*kcap)(mc9lv6 0i i*baround level with a kinetic energy of 40 J. At the exact top of its tm0v xk b(cv6m)la) ad*9c i*iprajectory, 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 ground with a kinetic energy of 2g)bvr86k5 e x.:r+lrfayvru os f 36k220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height,6f3rlys.6v28kg afr)k:r xuvo +eb r 5 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 (+ xkxky)gl5/drzpm(1 See Fig. 6-2). Neglect fri gdk)rx5kp1 zl(mx+/yction, 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 startseqe)b8j6 vn o3 lcp d4aauy--* with 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 speed of the roller coaster at the top of the next slope, which isb64la -)ed8pqen3ca-jyo *u v 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 be,mwv .4b/ rcxottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastee w/m4xcr, vb.r 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 at the bottom of/*8v/-n+yx duydjrs5bne s7 t 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 pulliqqv2/k()pfh3ht p18 bo0pkbed 30 cm away from the vertical axis and released from rest. What will be its 0q )qpo 1tkb8 vp h/f2i3p(bhkspeed 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 )bh gwwg:;*uw25 m/s hits an initially uncompressed horizontal spring with spring ch ugw;g b:w*)wonstant 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 kg car to s x+y6zs zcd:sho663ibb6 7-a-mhrgo gtop for a red light. What work is done by t6s-6i6z36 +oy -rhg:azo ds7bx gb mchhe 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 betwee96m*n6+a i1ksr ur qcimp1. pfn 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 ir 1f6+n9uq r1cmkap .6pim s*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 uqwa: pbc;h:/i76m am, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How faci:6a7wm:h; bm puaq/ r 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 surmhzdkv r)x0h ush;,- vqj5z21 kn+ d(pface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a disjk+z(xnh ,k)qm21 h;vuz hpsvr - d0d5tance 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 slope. If tjo2e fe/*ie/5krck7fgh w8/ dhe work done dghe5kf / */e j28crkweo7 if/by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 m long aid5 p3e69 grshl8zyo;ip ;solr +7g d2nd rises 2.0 m. It requs2 dpl 6o+ii8g ; p5lsg7ozhdyr3;r 9eires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released-gr,ovv r c3ft,k:.u,+sp vod from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic ovp, rv,sfkd+tuog- :c.r v3,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. *,zorlpqvgr+ 754gcio+:x sr0 m, and strikes the ground with a velocity of 7.00 m/s. What averag5vi:olqx,sz rgr*4 oc+7gp+re 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 energy when 5cq6.cav-b omf0vb j/ he runs up a flight of stairs 105f-bmoc/jbc06vaq. v .0-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 tsobvu*kq(w eq9(6y2 q o move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the foros6(v q( 2kqw9qy ebu*ce?

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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 aret r lx)xy;a7l6 used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W) 7l; r6x)talxy

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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 force dos nv y*m/fts,9dww( 9yes her foot push with when she is traveling at 8.0f wsn,9 s(y vt9*mw/yd 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. What is the avera1koo61h +locjge power delivered1 lkjo6 +oo1hc by the engine? (1 hp = 746 W)

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