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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 un2*3pk2ut ug2y0f qyzait 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 there is nop3wmfs6k(2( zadc cy 5njy9/l 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, thx,t fp32gi-t ep*qm5re amount of work you do -f2*mr 5txg,tiq pe3p

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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 muhxj0bk- 3m44 x rcgq-mch work is being done in holding the box in this p4h0- cj-mmg x3r4q kbxosition?

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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 10ocw;fw, so gkd ot);( o.n/4ej-N object, the amouo;()dj fwe c,w k.4o/n;st goont 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 n 6k(j ;mpfy;2891mibhs vubc vertically 3.0 m then returned to its original position. If the total weight is 30 N, ;y hvc 9j2fbkm8nps(m ;b6i1uhow 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 oxw;-fo6l 7rn63m) du6xizq1ke :.jx x5fyeqmn 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 up. Compare afoakzvc .h2b*y(*gf+ *wxf*the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goeza2*x*. bf f ofk(a*c*hywgv+ s 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 positi09p;h75ywj9fs;+xp pwwz ur xon (F vs. x) graph, representsusjpf; 9xzrwwy05; +p7wp h9x

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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 versy 8)qc.fhu:mor 3i l8iv,tj451w ysbu us position (F vs. x), what represents the work done by the forcymfo,u l4c)u .b3trv:h8s8j5q 1 wyi ie 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 energ(+pn6tk d 9vwcy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then the obje iqpz2 qaeb897 yxy o(*6oze,jct'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, 4eis+5 pzc,flthen 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 a.ez89k 1k j.fkrfv,l( 9qt fkvs much as a car, and is moving at twice the speed of the car. Which statement is true about th tkvqff.9e(,f ljvr8kk1.k9 z e 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 mas oqh:s12l- +ibzbr)s ms of car K. The kinetic e:s- bhmq)o1i+sr lb2z nergy 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 boun* q b9zjziyqc8v l,r62ces back with half of its original speed. What is the ratio of the final kz2jy* rl,q6 9vbzicq8inetic 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 pebble is moving at a spa d(nfe qiwxkuz .k*,k5 (qdc1w9 3go0eed of 5 m/s. If both objects have the same kinetic energy, whafino3gkzd(.,keq1 w5 qac9* k dx0u(w t 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 speekqae , 8h)t3mxd 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object tr, qh8txk 3a)emavels 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 e+g z f*o ks 29oj 6nms3h1mj5bm)ex8pdistance on a straight, level ro e *e5s3 + xs8hoj12b6fgo9zmp)mnkm jad. If you had been traveling twice as fast, 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 orbits the Sun in an elliptical orbit. Nc zd/blk, er 2;k4-xaoeglecting any friction effects, what happens tc a 4x/l,z;b ordkek2-o 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 princ*ic 1e+0a3 abwovym r3iple.
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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 negatie))e6haj/a ygve potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a heighth(xv(s u6ed+mq -h (vb h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy (x+bvv6 uqsd(emh (h- 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 gdogd8e+-xr oqx5 3a 4spring causes it to stretch 5.0 cm. If another 0.200-kg mass is adaxeg+x-d85ro43d q goded 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 energy of ah , yx i87nk7bdkz/-mo 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 Kmi7 zwa l,f r(/7s8jau, to its potential enerua/,87 razmi j(w7 lfsgy 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 u8o lf.)p6u0niuda ai3p 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*48y 1gr pasqui *cx4skx*z4r sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises r4pg4 84*qsa c1kizy**xx surto 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 xt:y0 ul.a l-dns*gb7kbn /2v$m_{1}$ 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 for2t b2lrg8ijf /zf0nkr*e -uy3 conservative forces2rf30j k t- /*ui2frgbz8ney l.
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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 fric:0xeo7 jwa0pbj f,4vwtion is present), to the ground below. How does the kinetic energy (K) just before strikijxwpb7f4vwae 0:j o, 0ng 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 gainz*u:j73 puiz us 30 J of kinetic energy. Do not ignore air resistance. How much gravitatiiz7:3u*zj u puonal 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 opwz tq zct0o2iys((6:f gravitational potential energy. Do not :zsoti26ct ((q y0 wpzignore air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conm6ylfx2 pyu- 8servation of energy.
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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 isz9 d.d nbl i(z n6,*n(srxbn :.dqv(th

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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 SI unit.0r :6xm,rqa+w87c sktavj ihs?

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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 axg/ry15gu8 pof 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 in one-third the time.q;cc d6rsrb/s -tj a.8 To do so, 6 r8q-cs; jrad ts/.cbyour power output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant accelerfev1wt99 .fa og/a( jqwkd: 6jation, 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 anky:0mr czy +c,d held there. If the object weighs 90 N, hk zmr:0y cy+c,ow much work 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 book56g9 wsnekmmvg 3f6s q-z-4bq rjzr*0 up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done bywr5 9km*zb-srz6604n q j g gevms3q-f 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 cf4v9om ;d lri:m54vvz onstant force of 5500 N for a distance of 50.0 m.v5 9dvo4 :4mmzr f;liv 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 upward with a constan cad. rwrp(g:7t force of 5500 N for a distance of 50.0 m. What is the work done by the wei.dr(wp 7rcg:a ght 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 withh-sqxk* b blv3b36a 6y a constant force of 5500 N for a distance of 50.0 m. What is the net works a -blbx6q 6bk3hyv*3 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 upuqq q2 vb/emf9p,23he yqy :78s o1gzv along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0;jxf6 q 9npf,u/ rex.o m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy sorlj */*7vu ixurface (assume no friction), with a force of 60l *xio */vjr7u.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 directicgcky9. a) jmc:x:8pv on of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objecjay k p: xcg.c):v8c9mt 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 thx- (tixt/jm0 t6a3br je force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mojtxti3 mjrb /0(x6-ta ves 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 inr0 p- ecr vs)o:fbbe5403yeel the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves fr e00vf4 cepbsl yb -3er):eo5rom 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 t npgtcg8l59tq8 ;kj;nhe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0c59;ntjtl g8; pk8nqg to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (infm 5pnnfbamohp0 5 ,79itially at rest) across a 10 m level surface. What is the fm bf 7m5nppanfo905h,inal 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 a6 0pd. mlhk-gtpplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cg6 ptl-h.kdm0art?

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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 / jps9xc; 1j.a3 xqxkaspeed of 5.0 m/s. How much work is required to stop th;ax19 qxj./ cja s3kpxe 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 disf9+g p:z(ejjl 7gmdo+tance is required to stm(zje+7:f l9g g+jo dpop 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 prb t nf(:rp88umgb3x(kopels 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 lebn k(ux8brfptm:8 ( 3gave 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(4( g k:m lklkba3l0nk 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What(k( k g bl:l3lk4nk0am 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 horizontallc )y km0(jx6g*olvrk1oyi a 21y into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a 1yryjgko0kom)(lix2a* c16v 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 a ) owe(2/ulg2m 8kon wqfloor to a height of 13.0 m above the floor. What is the change in gravitational potential8ww )22uonm qlk(g e/o 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 n7:5 okn9 nbgym long and rises 2.0y:n5n n7kbo g9 m. If the plane is 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. What is tuz nfud):3wb:m m*-2 xc50zejadvl:90e ns h bhe sprin3 dwn2z0bm)x* -smv b5:0uncd9::aehzju elfg constant?

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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 px6y3 dsgm :.xy24r)rc e5tfb potential enerc:65rbrxysp )df4x.m3 2 tge ygy does it store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially unc qou:mto (oy,zoj1n n,n4u30nompressed spring with a spring u n1 :,3ynm(ot4j, 0nquoozon constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretcha8oka )eg 8j9i a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the u ai)o8e gj98aknstretched 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 compre 9lw;yccv:*azq84l hjtk y0p +ssed by 3.0 cm. How much work isylp*czvqjkh 9 t;+ayw804c :l 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 o:zj vq*c;,2zic rvf.a 50-m high slope. What is the speedf i;vv,qzr. j2o*:cc z of the slier on reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off thkk; swqp/tst h58)9 xth nmp9(e top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping p t; kts959/t(h)8 swpnhqkxm 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 frictionlesseqxpg46 *8wly inclined plane. At the bottom, it has a speed of 9.80 m/s. What w*ey8 l6q pgx4is 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. 9 szw+ow(lk sizaw 58* When it is 0.70 m above the floor, its potential energy exks5w lzs+iw zw (8ao*9actly 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 groivjcztov+tg i7is)k e f60)0h- 7u6zg und level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To whatjv+6i7k zcug-t0ive6 h 7zsf0i)t)og 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 220 J. Atxhem h q4;4g/uz77l jl the highest point in its trajectory, its kinetic energy is 120 J. To what vertical lehq 74;hgz /x uj47mlheight, 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 em t6g ull7;9o 9b9wffa point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the se6bwf lofu9g tl;979mpeed 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 w ffizhdb +(crovd8-:14/yb ir ith a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect-/b cirdy fdh1 foi+z 4r(b:8v 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 zeq, f0 zmy-d5rcc*t7point 30 m above the bottom of a dip with a speed of ycd5 rqf ez*m-0 z7ct,25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its s48d; ga7ato35eeyptt) k tk.hwing (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 u epgg*+s2m)wt2qw647-dd ev2 lck bj 50 cm is pulled 30 cm away from the vertical axis and released from rest. q+ek262pg)cegd-wjl tw7m *uv 4d2 bs What 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 initially uncompressed horizon a0ls8fgdu5 ,xtal spring with spring con5s8gf,x0aul dstant 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 tzomxk ,7 6yo0jz f9u)kg car to stop for a red light. What work is done by the ou,)fm0 oy7x6zj 9ktz 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 surfad+b,a j.o g8/7, w:qaqyihpzpce is 50.0 N. If the initial speed of the object is 25.0 m/z qjd+8w,aaoy7 b/gq.pp: ,his, 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 surfpm giw;v-9xwl104rq face. It has 24 J of kinetic energy. The frictiox1ir wp;vgl0f 9qwm4 -n 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 applied horizontally to a 2.0-kg mass on a level surk og5g)g69hcgface. The coefficient of kinetic friction betgg95oc g gkh6)ween 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 gadl;2 ..sijef+s at* 7,qjrqfrom rest from the top of a 50-m high slope. If the work done by frictiot ;fij2. j7g*s.lse+q , arqadn 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 w 3 *wevw*w:9qcrc.gu/xu1a zand rises 2.0 m. It requires 3200 J of worw r*u*/za3cexcwgw wq:.1 vu 9k 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 from rest at the top of a plane inclined at 20e -mqdck5;go+h( ;xmeh above horizontal. The coefficient of kinetic fric ;keqod (5hx;+hmg- mction 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, and strikes the ground wiq2ttw2hnm5 3 +v9 ek; 9cqvpodth a velocity of 7.00 m/s. What average force of air friction acts on it as it3pd9h ck2tn 925 ;qemvq+ovwt 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 h4 adzop.pg:+n.i d,yqe runs up a flight of stairs 10.0-m hip niop gz,qyda.4+d .: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 objectb gnaqetoxiqvq.tga-cn c0420h(24 9 with a constant velocity of 5.0 m/s. What power must be delivered to the ob9i(h 2g nnqx q 04t-acta40c.bgq2voe ject 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,j7ydak, p zsuk/6t4(rc7 vu6ulugi ; a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)4 vg ,6u7;7ji pkstkd(c urylazu,/6u

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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 Wthw,(g rfh+ u* while riding. How much force does her foot push with when shtf, u h*whr(g+e 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 from 0. smu59 wtsp)a to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 ss)u5mwa p9t.W)

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