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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 exp)c ufoxwguqkszy7 7u4a2wow)+hv 8-5 ressed 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 no motion?m9q+2 ma5 j,.equn4;pirb/wlc ) nu zj

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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 r0v .jdsgk1(zhard against a stationary brick wall, the amount of work you jzd(k0vr.s 1gdo

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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. o;,7 sj1. t/m n uje.yu7anyhcHow much work;hnc s ma.7j71t/noju y.,yeu is being 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 constant velocity carrying a 10-N0)6ztugby v* l object,6zv0)y *gult b the amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertlij 4dfd)0eakcly71bj0t ;p wvu8z *7ically 3.0 m then returned to its original position. If the totali7aey4 j;uf*vjtwk0 )ldl 8 d7zbc10p weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force actip.-opo lkkf )-vfgl03ng 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 str0;in/swk 2 2io pyrhxo2 d)9wyaight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it g29iy2xs;wy02woorn dhp)ki /oes 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. x) graph, refn jfvef+7n 9c4 4lak,-)tphnpresentschk f pfna)nfnjl,e 9+44-7vt

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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 reprl k m)2j6btu:sesents the work done by tl2bs)jm :6 utkhe force 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' nu.5 wctu-ih(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 objex u-e*it32 savct 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 gv 6wk,xp+m4d 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 car, anat3:p 0 f,yl-avcw 4jnd is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared c awjva:-n0 4yf,tpl3to 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 w51 8elph1 odycar J has half the mass of car K. The kinetic energy of car J, compared to car 85yhp1o1dwel 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 bz r5-x+rm. x,crrvo nt (74kwmack with half of its original speed. What is the ratio of the fvo m,- twmn(4c5r z+7xkxrr.rinal 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 o:dca - r25k xu2ds6vmxf 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kineti2dru 6s:ck2vx5md-xac 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 iml7 iobx8m8ge4rw)n kpg-(1moving with speed 4.0 m/s. Both objects encounter the same constant braking forc4il7g (bgox18mep8rmw -) ikne, and 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 your car in a panic, and skid a certain distance il.yviu( .dk4on a straight, level road. If you had been traveling twice as fast, what distance would the car have4..l i(d yuvik 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 ellipti(+ua/m6r im qsh 1toi0cal orbit. Neglecting any friction effects, what happens to the planet's kinetic60hi1a/qsrtum io+m( 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 prit u5 )zkvew )fg6n,j;snciple.
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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 /kq,(by )6d+/ o e g;s9dpr4 giafubar s;kg1lnegative 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 height h ssse,(uh1kl/c 3 bt /aabove the ground. A second object with four timest( u seb3ch k1al/s,s/ 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 ty2r;km* rrt: z:tbyh7o stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential e yyr*t2rhm7; tz: r:kbnergy 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 enerk6n38* gh gfcc2ymh :xgy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, to its potential ene -d0rmcf+9dxc rgy Ud+-x0 frm9cdc.

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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 ocld/c;7uin ) i8c)dg4kt:l ahill.

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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 equaltsw- h+4zlcaiu u; )r3 speeds along a level frictionless surface. They both slide 3+r4icwz)u ;shtul-a up the same 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 4udgtj)w jz/fa g w5,z gc ),fj,62awj$m_{1}$ 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 or rcs;5v79g9ry 2wv9i ce;jz 99lfrcy f mechanical energy for conservative forcesif r;evc9y9v2 9w 9r jc7c 9z5;rygrsl.
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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 fricf(sn;;kuyf-h v- f (cntion is present), to the ground below. How does the kineth-(n sf(vcf ;;fn-yukic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 30 J of kinw*;5,robw57u0fii eo q2qr r ketic energy. Do not ignore air rif0 q,*rwr5;ib57oo eru2 qkw esistance. 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 distance and loses 30 J of gravitational potential energy;ovbgkk;o +m (. Do not igno+k;bkvg m(;o ore 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 conservzhnjfl(z f.j4 ws,-a9 + xcge;ftbd .g)b3rv9 ation 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 isa0fec*vo.1 mm

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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 powerz-g0,gfa r9 mq 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, whic:s ha)0 2f ohsth*-okrh is not a unit 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 3 times the work in on;wuev e /0iif4(fpd4x e-third the time. To do so, your power output mu ;4e4xwfv0/u(fp eiidst have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's engine muvo.et+l+ft+ 9f d 9.6bffgennst

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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 the object zrr :t 8-e()sbg/ wlnu :uu8ocweighs 90 N, how muchtngr w l/-ur ze8u(8s:ubo c): 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 book up in the air a disw ,lfk(/)m+dq(ky 7e4jdrlyl vr9 jv4 tance of 1.0 m, at a constant veloci4rdm9ly j/dk 7)vrw, kqlfv (eyl(4+jty of 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.(j b1,z pitme--ptxn upward with a constant force of 5500 N for a distance of 5-pn,ibe.t zj1-mt px(0.0 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 upward with a constant force of 5500 N for a dist/ufp+ td7sa1lrj 7z+ qance of 50.0 m. What is the work done by the weigu +7sfpjrd1z+at /7 qlht 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 5500 N for a di-jhrw rk*,yq;stance of 50.0 m. What r hyk-r j,*wq;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.b *omz+2l:gk ,p(4wzyz d jhvs1,go7f 0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m down a ramp, inc+oi vn9ss 0/julined 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 no fwn xp c/b.u lwjo8twvl32)l3 0riction), with a c3t 3xl8/w)bjo02 .upwwvnllforce 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 graph in Fig. 6-1 hs() 1(jy c1rs p,fcgushows c)fss hr jpc(u, 1(yg1the 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 object t9- g0kc:yffl. .iznyw zmb: -in 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 f-ti.zfycmg0z-ly:f w9 k :.bnrom 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 Fig. 6twb s//ffyf vta7j3i-y7 h+9c-1 shows the force versus the object's position. Find the work done when the object movf-hy+ cb/s3 y7ifa t79f/vjwtes 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 objf+ 2e8iyv ;4k.zyptut,cdp6oect in 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 from 0 to 6.0v8tu+,ytcef pk 6;o .p42d yzi 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 206enfu1d h)jv ,0 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 the cart?, 6f1)vhju ned

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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 q8t lb4lw0nqp-,xk 6z move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the c,4llt q0nb6q z8xkw -part?

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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 murg2rz hrl:ugbf /k77.ch work is required to storl7: 2rf ugbz7./gkhr p the 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 distance is re55vqsr/eb:s m quired to stop a car moving atsq :m5vrs/b 5e 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 bnq.26vn4 . v(x4hc iejhmj9foy exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leaqj. h .i9fh4n6 vn j2o(cm4vexve 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 co-h9 hqyd7wfh*b0c 3r omponent of 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 d-0h h hyo9frw3q *7bcalong 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 horizontalc)(b y*w4mwoq+dtw b4ly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetr*d tbcw w4bo(wq )y+m4ates 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 ao8 2awpy k3sh8:qr am. floor to a height of 1w psaqom83: .raky28h3.0 m above the floor. What is the change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined planeg 76gj9tn fk*q. The plane is 4.0 m long and rises 2.0 m. If tq 9g6t*njk f7ghe 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 esaoc*;k (83k rqcr;d stretch 2.0 cm. What is the rkaqk o8*r; c;c( d3sespring 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 vnfey .81 m7glzss/0c N/m. How much potential ener7sg/mlc.8 zfv e1syn0 gy 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 uncompreu68 w5ddd-tqy ssed spring with a spring constant of 25 tu-5wd8y dqd6N/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 stretch a spring of spring constant 4r 28w;js+f uam0 N/m from x = 0.20 m to 0.25 m? (As+ aw u;2rmsjf8sume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initiallyu5yiw,s6 n4 nk compressed by 3.0 cm. How much work is required to compress 6 5wiyns kn,u4the 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. Whb0kknu32t ga 0at is the speed of the slier on reachingtkbg u320a0kn 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 thhbm) )f y9jgqyi6*x5ee top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how x qgi 9)e*hfy5j )y6mbfast 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, n; *qyhxy1ms,+cjri 4it has a speed n 4j ry;i1 yx*q+mhcs,of 9.80 m/s. 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. When it is 0.7ssw 1p :joq0cxucch(( t;-5xc0 m above the floor, its potential energy exactly equals its:c5pjs-(ucxco xht0 c w;1qs( 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 saq8cgk n1+- ijtraight up from ground level with a kinetic energ ka q+gj1-c8iny of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinet(3:i0i1jxmvm 3 lz uusic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pom3i(jli u13x vum :s0zint, 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 kv:jc)/+hxah o nj*lvcn 630lwy18 *oh lf w2athe 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,kvvj8aw3n*c:/0xhfn c)+*h l6whojl o2 1yla 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 point91e 0.l/e-q11zfxhsa 7 olx)hd1s3ew fnqkbv 45 m above the bottom of a di1foqx1qa39lbe11e l xnw zs )he7/hd0v.-fs kp (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bo98gq6 9mup33at pku ibz-p(rottom of a dip with a speed of 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 ab(pkp tzq am9iu8- 6b3u9gro3pove the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its sz i32jpmj v6rp-4hb38o k rg)gwing (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 away from the vertical axis an 77wjux vv lu+9i4*5 inj,tbwyd released from rest. What will be its s7lj y v4vjb*, iuwu txw795i+npeed 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 l q9yfoymf l57,(7hrezt - 2mn25 m/s hits an initially uncompressed horizontal spring with spring constant o2 ozf75yrtqy mn-(7lhl ,mf 9ef $2.0 \times 10^6 \; N/m$. 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 eo/1 li )kyraj7mi.6s stop for a red light. What work is done by the frictionij7mei kl 1sa o6/ry.) 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 fngh 9b)((,ona ,x0palb fhy0 a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 mnn9 0ba0(aghf()l ,phxb y,f o/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/ b 3t 4qiq(4v-5tg3ygwsdb ui surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wi4b(3/g5itq v y3sdi- 4bgtu qwll 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 app la z zsiz;3l9)+v-xprlied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the chp3 zl+l)zar9;x vs zi-ange 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 50nyb2iug . g0j08n6 x+c7oboebeg aq06-m high slope. If the work done bb ge 806 no0nb7oc 2.yexiauj+q0g6gby 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*46d+ mjs7cd)2 ksd lltbia m4 is 4.0 m long and rises 2.0 m. It requires 3200 J dms il) a467d4cmtb 2+ld*sjk 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 from rest at the top of a plane inclined at 20e abovxx;av3ejqz*ufz r v * 33swa;1e horizontal. The coefficient of kinetic friction betwezvsa* r *e fvq3zu;3 x1;a3jxwen 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, 8ei2 jv.-8emk)pk7runlsa g3j 5lvs . and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts kuea7v p-vkj25j83 lr.ei8snl )ms. g 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 60.0tmnug+yxw *)2t-q6gl r xd9a(-kg boy using energy when he runs up a flight of stairs 10.0rm-g+ (9xx agtyl wu q26)dt*n-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 neede8ss+u8gbvqsn) c j p0+d to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the forvqun88p+bcs g+sj0 ) sce?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hoki46+ es jdf1p = 746 W4s f61oiedk+ j)

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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 does her njs g-b274vejfoot push with when she is vj-7j be g24sntraveling 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 to 25 m/s iny,gyrz47 5atc;ef g w: 7.0 s. What is the average power delivered by the engeg f 4z7yw,ra:tg;yc5 ine? (1 hp = 746 W)

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    总分:95分 及格:57分 时间:不限时
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