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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test60.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  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 workkrl-:bk u7oc-00vi9:s v t sb7vl7fdj 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 no by19q9qui9v r 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 z0m-xu5 p qox j8n7wr3 (k3, vypzjus.wall, the amount of work you r0-qu8 pojs3.zjvwny(7x5 uz3x,p kmdo

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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 liftedhb9v5+ lp0fxxu, y e,u 2.0 m vertically and is being held there. How much work is being done in h9p5h,,u+ xel 0xuvbf yolding 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 forjzrv , f 8yu84i;1qbvdward at a constant velocity carrying a 10-N object, the amount of work 8yi81 jq,uv vb rf4;dzyou 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 verg 0vzg0xgg(b c+zzd x:4ak.2ctically 3.0 m then returned to its original posi akbz gc:v+(gxz.0g4cd0 zg2 xtion. If the total 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 acting on an object do work ovcj- 4/bjukhw(; -lrdn 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 straig:h n/benxi7j ha :8f9uht up. Compare the sign of the work done by gravity while the ball goes:hja8 x: n9ef i/nh7ub 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 vs. x) gxa m0,s90l / btu8erg fffb+;araph, represents ;,asbf0t9b+ u0lfea r 8gx/mf

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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 7,pfs kp)6wyy1l1if z position (F vs. x), what represents the work done by the),kpwy1z67fi1 slfpy 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 ej47x j;8ifd;l u :blbaa9bao .vb5z2positive, then the object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is ne:t93 4gphdlw xgative, 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, thre7:)2f,os gw 0 h v24iinycmnen 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 a/ge, hl vr qo:+0m v4 +,hijvvjbnrg23s a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic ehq+v24nb0mr3li,ovej r ,+h/:j g gv vnergy 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 hals akwvi 22m/-kf the mass of car K. The kinetic energy of car J, compared ksa/m-2k vi2 wto 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 d 7ja6 -lrxn.hbf/x qw)r(n.phalf of its original speed. What is the ratio of the final l)brxf- .x/jw nhd6( nr.paq7kinetic 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 ml:r7g fo du6r0/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 bricku: r d7rglf60o'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 x00s cioiatnh a .)g4+moving with speed 4.0 m/s. Both objects encounter the same con+ tcahaioi0) g.40xns stant braking force, 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, as70qh msmt4+ 2xmu,bqnd skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance wouhx2qqmsm+4 b 0u 7sm,tld 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 elliptd8f4g m3.phgfy t9vy2qp,cm, ical orbit. Neglecting any friction effects,83 92 vygctm.hfg md,pyfq4 p, 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-energye6d9klc jco+ c+ x4z1j 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 negatg.mu(pk wkbea.17 ,rw ive 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 above the g wzv6)h*dmv*w2t+erl round. A second object with four times the mass of the first if released from the same height. The poten6e)w*z+v rwd 2t*v hlmtial energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 8lpqb g55fp o+cm. If another 0.200-kgfpbl5+ p g85oq mass is added to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy of a5oaf /ur /.a-qcfgnf + 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. )xsmcuuy2d b2vc x -9.Compare its kinetic energy K, to its potential energy Uycsm 9x.b2 d-)u 2xuvc.

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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 up3u7x, ds:utn)3:rvn thx ckl ( a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding with equal speeds alonv4a13 e w/1jlrjlw+jwg a level frictionless sur l4ew3v/w+rlja1jj1w face. They both slide 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 zeuuk ;rb6o +wvg;,rg /r,pg8$m_{1}$ 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 cons)totg rhcoe*g rzc 7yt3h *7q5 wla(6(ervation of mechanical energy for conservative forceswyteh to(q5g( rztc)7 cah36*l ogr7 *.
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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 fr mouac)1nh; w9iction is present), to the ground below. How does the kinetic ene1w;9 uh)noa cmrgy (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 kinetic energy. Do not ignorbo80fu3yfneycj07o *j*knc1-rn e z *e air resistance. How much gravitational potential energy dc80eub1 kjznfn*n*j-oyf07yc* o e3rid 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 gravihzt/ pqj(xr2og/g qm9qb.q( 1 cci;.gtational potential energy. Do not ignore air resist/t rg.bpq;mgqi/ c 1(q.2 o h9z(cjqxgance. 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 conservation of energ xzbve p *y k+e-*pcf.1bnn4*ay.
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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 iseww/9osyok)- fgr p,5

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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 in2g.;/o bqn71bivwk hm .:bqh n 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 power? mjd6hhvob77b *da*a/

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday( 0fjgu:ly u.9dag 3bp, you did 3 times the work in one-third the time. To do so, your power output must 39g.fa p gd b0lj(yuu: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 constan-ejzv 2hra efs vq-+3/t 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 verticalgk ls9aqox16sjv68wl6 zdm -*ly 2.0 m and held there. If the object weighs 90 N, how lvs6 sqm 6*j9 81zaxk6odlw- gmuch 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 distance of 1.0 m, at a 1dbcahj8h :c s6u;o ;idnb5l7(gswrw ynt836constant velocity of 0.50 m/s. What is the work done :ltuh;6n ic; 58wdc yb8j3716h n(adsgowsbrby 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 forct)qcpzf dpwk64;yo /+e of 5500 N for a distance of 50.0 m. Whaz yfp tcq;dk46p)+w/ ot 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 555 fh+08xjz uew00 N for a distance of 58hwj5+zxe f u00.0 m. What 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 constant force of 5500 N for a distancx p sdr2os2e7m0zas8:; btfb*e of 50.0 m. What is the net work done on x sdzt;f:b0*mso2 r2absep 87the 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 v2sy0m6ig/2t0pjhvv 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 downt. a(1wqke6gz 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 icy1 *)l krync- bwo(pq0si q:b1v surface (assume no friction), with a force of 6s1 qo0 bivcwp y: *-b()qkr1ln0.0 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 objectaj pz(/wgf qb ;s+nb:4 in the direction of the force. The graph in Fig. 6-1 shows the force versus the obafp :;g+ s4(nj zq/bwbject'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 in the direction of the forccv2 jr3*mlr;ze. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 ml;m 3zrjcr*2 v.


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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. T+ egil8hd;: m a:hn2xlhe graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 tod :n2m:hxh8igl;+ la e 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 the force. The graph in Fig. 6-15zh*spd-/ srq shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.5rq*h-/ds s zp


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force o.g .3kwl c0udtf 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m .3d0wu .kcgtllevel 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-k -se)jyel8yc-g cart (initially at rest) across a 10 m level sujy8-e)y-cs elrface. 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 m8w)/r s 9sd noswq6wet 1r wc-wlu7.i(uch work is required to stop the mawlssd78-o/e)uw iwr. stn (ww q9r1c6ss?

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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 initiall52) t c q7lth1tvs63bwjhw:zdy moving at 25 m/s, what distance is required to stop a cartj )h7h 5dcwz6v l3:wt1q2sbt 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 )5q4an gqih4orowt 6, 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. Withg 6t 54whoq ri)qa4o,n 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 vva g/;2ze*i/ yl l/zqvertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, yv*//i/ ; zeq llz2avgand moves 2.0 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 6 q+vnal(t,;;n+)svvea d ljgg is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrate)na 6+lg ntv, ads;; +ev(jqlvs 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 a floor to a heik+kt8xq:ypmsx- l 6/ rohs; 3aght of 13.0 m above the floor. What is 3;s+lkom pa:8h -qs x y6t/kxrthe 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)e p3yb(x-3 )stno ise up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plse3)n i)3-oxb e(syptane 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 gdo.f-tzxuktrx ro0( +9*9 s aa spring, causes the spring to stretch 2.0 cm. What is th gxf*s(-rk o9+0rt 9dax.ouzte spring 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 mub,t8 jxxq2k3hq(brd ; ch potential energy does it sxj8b 3trx kq(qb,; h2dtore, 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 uncompressed sprinu:rf 90ut b s56i wggotjh911ng with a spring constant of 25 j0r utio s99:51n1hbgfg6u twN/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 str) e8mmej7h6hpetch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstp6h h e8jem7m)retched 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 vs*owxp1 c7cs1/efg r *9+ims3.0 cm. How much wor9iss*7rex1 cfmv/gp+o wsc1 *k 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 fwa52ut z1w+4i91b 6iyvrh ucg rom rest from the top of a 50-m high slope. What is the speed of the slier on reaiiuwgc6aryw4u1 v+h5t1 bz2 9ching 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 the top of a hill with an in. a3e8 rq-zbj 5ymxf9r3;bhn yitial speed of 4.0 m/s. Neglecting friction, how fast wib9x 3 5- mrabhye;jn3.f8zqr yll 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 frictionlev48-l6 b2lov i 0vh72fpu nkxsss inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height o-7ilxn v4 8sv0u 2lfhvbok 62pf 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. Whej(d *:,emh ybnn it is 0.70 m above the floor, its potential energy exactly equady,nb:e(*h j mls 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 ground level with a ki2lfa:8id bz7f l6i,o znetic energy of 40 J. At the exactzo i2ia: 8 6fl7zlbdf, 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 theh/y; zc pi-, uc)ldpe+ ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetcye;, dp/ hzi+up-l c)ic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster stardc6 v )iy;ry)pts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be) ci; pyd6rvy) 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 at3 6opl0fsnrltk8, hdh 18d;s b 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 isdh lfo08;b1hdnk6 tp s8,3rl s 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 poicf 8qcg 4c+nnn .,k/swnt 30 m above the bottom of a dip with a speed o4n/8kgfqwc n. +c ,nscf 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 5 zxk qcv6khwuy)6p- .swing (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away froms ocw2jys-i5fem-+l tr, n4 +y the vertical axis and released from rest. What will be its speed at the bottom of s- 2f4y+,jtimcnly wse+ ro-5its 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 uncompel4 9)-yit6n-ov8zzmai :uxdressed horizontal spring with sxv68-zu9-ao:iz edln )y 4 timpring constant 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 oh7bik/vdx77her 2000 kg car to stop for a red light. What work is done by the fricti7 7kbxi7v dh/oon 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 a8 p5q97y(9anc z+nyz;jro 4na)lqbu p horizontal surface is 50.0 N98acy q+nz )pzqp4 yn7l5uoabn(;r9j. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surface. Itob3dtr, q vydae7f4*pi2g k 6p2*oa 5v has 24 J of kinetic energy. The friction force on o2tyr qv d ,dab *v67ogea2 pf*pk435iit 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 horizontal6jupy83u waj) ly 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 6a p)u ju3wy8jis 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 jhv 2dt t+;i1pfrom the top of a 50-m high slope. If the work done by t;p+1d th2 jvifriction 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 plane1;ek ljulwz/e) zg0h4 . The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane.1jelu 0h4;gklz) z/ew 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 rhn4b*r (sgl x4;e.k8 bk (4mlyvm+jsat 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the spee4xn .;ygrms*(h ( 48s4 kllrj+vkbbmed 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 with akfy9)bte u -)p kd;f+a velocity of 7.00 m/s. What average force of air friction acts on it as b);yd-ufetk) +fapk9 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:ygt oew7c ;.o when he runs up a flight of stairs 10.0-m hiw;:y to cog.e7gh, 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 h.gjvm,dlz jc0)at( iuj81 ml95aa4 ban object with a constant velocity of 5.0 m/s. What power must be delivered to 9 jg,c dl.m)j5au(j04 ltiz8ab 1va hmthe object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that runs for 1.06b ds b7: v)e:wmaa1(d mtz)a*gb,bvv hr? (1 hp = 746 eg m1b6,:d) bvv7s(v *batdz: a ba)wmW)

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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 ridin lnjj+ks;0r +hcrs.: mx c ;10cf3taprg. How much force does her foojs:;c r+0c +n1tahfxr p3lmjr0.ck; st push with 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 from 0 to 25 m/s in tu7 .k- ni c:e/xmlq,moii(l57.0 s. What is the average power delivered by the engine? (1 hp =c-o.ml it ix lk:(,/einm q7u5 746 W)

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