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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test60.html
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed in w isy(7kp2.e0 0pn6k 0x iomfx8.qilfSI 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 sp)cwq3t ;3pni- vvm4 uystem 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 amoun1ds5v2rpta2 z t of work you dtdr2 z v2p51sao

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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 liftedyoia+,q9;j-mvwd 4r gc4gr 0 5foa2fq 2.0 m vertically and is being held there. How much work is being done in holding the box rgaomad4f,0q; v +5w9- gi2j4of qcyrin 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 horizonta13mz -zk3efzmlly forward at a constant velocity carrying a 10-N object, the amount of work youm3zzk e3-mf z1 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 vertically 3.0 m then retura5l d1o chgle-(qv,s yni/vnh l/(t2 8ned to its original poscvys1dhhni/at-2n e5l,gvll 8 q /o( (ition. 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 doucpc a 1l9o,g/ 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 the sign of the work done ozx-hftiaw:- h/; bendj4) j. by gravity while the ball goes up with the sig)4;b.t /e-f-nwi z:d jjoxa hhn 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 ze1cp)x+* sixx5 ryo(y :.fxaversus position (F vs. x) graph, representsyr .5(+fs)1*xia zxco yep:xx

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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 repreak2al8 sr+ bbd h5/(frsents the work done by the fosk a8fl+(hra/bb r2d5rce 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 kineti;b9n2w6f2 kkn q oij/ic 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 np ly:cwns6h 8*9jk,ww+oj2t a egative, 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 zerpbrnmu 5,i *p/o, 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 cl 63u, p0-68m7e yvmizb 3r-nuu zovxiar, and is moving at twice the speed of the ca33 i,roxuzu n7-byiz m6v l-e8um6 p0vr. Which statement is true 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 haqrw:as*ks4ct (bs z86rw)y.slf the mass of car K. The kinetic energy of car J, compars4ayk.8) z ssrs (:q*cw6r tbwed 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 anbigz4u348/ tme o ssd+d bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinsz mi/u+3et4d ob8g4setic 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 3ns6 buyo y)9hx4d/ lm(4ksww3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, whado4 uw3lswn)/s x9(4b hm y6ykt is the ratio of the brick's mass to the rock's mass?

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本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
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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 wif/gam yj*ds61x 5ppu*fpot9(th speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the saxg9omdt /psjfyp 61 a5(*ufp*me constant 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, and skid a certed + t95m lz dcm)9apbxc47)bdain distance on a straight, level road. If you had bm9ac b57l49 bpdte d) +cxd)mzeen 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. Neglecting vm ; i9a7k)ms1m9ijy/,5sgyv8dm fryany friction effects, what happenysjkfv /yd, 78 ;95miimsm1v gy9rm)as 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 principle.2- +xb h/cesxoi1y;ib
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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 ene(3s7l1fid )b4io ide argy?

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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 asak gg6.;iy. rpzr mg-b+h+t yy)xe- 0bove the ground. A second object with four times the mass of the first if released from the same height.gi.r0) .-rth+6gybyxp m-z k+;a eysg 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 to stretch 5.0 cm. z d8px4lo47z0ubs6 gkIf another 0.200-kg mass is a4 ob7zu6x ds4k g80zpldded to the spring, the potential energy of the spring will be

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教师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
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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical ener6)o0h6jwyb ib y*p9; 1urn)ww qjh,jz n kbf61gy 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 kinaeq erp3(8k8 *x7voe;*dcy dq etic energy K, to its potential energy po38e8dcve*de7 qy*;x kqr(aU.

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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 dril;/m :vh5l 7kh v:9.fy frai,ae:pzv/f5 bfuiving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sli0 xzplm 26qcme*uou6spih-,, ding with equal speeds along a level frictionless surface. They bothim 6hz 2,l,-cs 0mo6p*uxeupq 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 p z 19r3kc.p 7iqc +sfgaw+8sp$m_{1}$ 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 mechani,s it-dy-m+sycal energy for conservative forces.,- tmds+ys-iy
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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 frictionyxnitzuk(/zpdz j kgz7 n9 l29 +53+rp is present), to the ground below. How does the kinetic energy (K) just bep gkl5j9( 2d +i/9uz3ztyrzxnz n+kp7fore 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 kinetn 6k*rm(x z0tqic energy. Do not ignore air resistance. How much gravitational potential energy did the bqnm06kzx(r *t all 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 distanan542z 4zzw ikce and loses 30 J of gravitational potential energy. Do not ignore air resistanazizn 4w z42k5ce. 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 conserva 7v+hpmv ri)p rt8/o(ftion 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 is xgp*haj - kp61g-weve(4j v4d

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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 un2/-tk y/o-axh+znu scit of power expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit ofzo+rs qq7v8(e 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-tmc 3qr m(;pg:vhird the time. To do so, your power output must have bepq;:mg3vc mr( en

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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 en /)d8 3krxhp 8n0i6uqg3qbbpfphz i1f6 50cplgine 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 v8qq(lmnar;lhp35 i4.0 m and held there. If the object weighs 90 N, how much work was done in p3m 5qalin4(v8; rlqhlifting 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, /w.sbmx qx 5+we-lk 5yat a constant velocity of 0.50 m/s. What is the work done by the weight o-w.q ywsexkml+ 5b/x 5f 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 co1 mhlhkpcwp85;7wfz6zni) ,q*ro)o e nstant force of 5500 N for a distance of 50.0 m. What is the work done by r67o)8pmznf,l h;k 5*hqw ip1wcoez)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 550ntdbm 7hfq.082 lefihb: w 5o30 N for a distance of 50.0 m. What is the work done b5bhd bqlwef8 :20imtn hfo3.7 y 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 f0 ().rq5pzxvrbdn t1aor a distance of 50.0 m. What is the net work done on t5r1rtnxap( v. 0q)dzbhe 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 alonf dadzk6q15w .mw8dgv82 z0egg 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 fru;e+ xpbrj*y,hit slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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教师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
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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 siu;xvy)c 7(lb:sawx/z ster Sarah in a sled on an icy surface (assume no friction), with a foblzv(/u;:)y7sxw ca x rce 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 directio9ob5ca8ghx cju: 6k n;n of the force. The graph in Fig. 6-1 shows the fjb a;ou5x:kgcn9c8h6orce 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 in the direction of the force. The graph i iyz+ 1ha+arkn:c.r b 8 ;p(dbgdv;i8zn Fig. 6-1 shows the force versus the object's position.1knd ibrihzv(8ybgad+pac8r ;+.;:z Find the 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 diri f7.aec6da ee/ta+ju2 84yppection of the force. The graph in Fig. 6-1 shows the force versus the objec4a 82e+ pycadpie tj.ae/u7f6 t'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 the direction of the for lwxa1nmf9 *4lce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obm*nwl xlfa491ject moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applieds 50uc*x bi8nkto6y r.co8.j 0/ uokonf g*g0c to move a 55-kg cart (initially at rest) across a 10 m level surface. Wrxnyk0o/.6 c oj*k8t*o50nus0gcgf i bo.u c8hat 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-kctd *a ano55h.g cart (initially at rest) across a 10 m level surface. What is the final spet5o*5 nah.dcaed 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 reqf l rlq;pm)2f zyd-s,cr-;6h* ;cseu vuired to stop the mass? zr-,vl*6ys2qf-ml; c);ufdpse c hr;

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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 25t,d 27 h)etrg3lsn4b)u-i dkf m/s, what distance is required to stop a car moving at 50 m/s under the same condtgf)-en3l )4tr,u dbkd2 his7ition?

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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 proy.hd,cp1x-nzk/n tuyrf1 v2jx4 -:xvpels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cmryxxh2tf:-vd/,py zvk1-u 4. jx c1nn . With what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vrevczk(b qw- j7cn40s/p4a71ty x+nk ertical component of 60 N. The force is applied to a box which rests on a level frisby nk c 0zc7xqaj/t4nre14wp(k-7+vctionless floor. The cart starts from rest, and 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 g 3 x)ew8; phyxfis shot horizontally into a bale of hay, striking the hay with a velocity of 60 ;3 xf)8yhwxpem/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to a height))jiirm ow.p ,n 75ifc of 13.0 m above the floor. What is the change in g7ni,iro 5mpj fw).ci )ravitational 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 4.1j j oj7 trkat+vx)4bg))7 cph0 m long and rises 2.0 m. If the plane t4x1okb+ h)7jtr7 cgp avjj)) 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 ,igz hsy(p3fskul 4 .q12r+wam4yiz 0to stretch 2.0 cm. What is the z4sly1 mzi.yhr2a + 3 i wqs0gpf(k,u4spring 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 p f9ce.we(b9af otential energy does it store, when stretchedw9bce(af 9e.f 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 crsgtl p ess+)itu: nqg34qwx3jk6);:+ dwfd0ompress an initially uncompressed spring with a spring constant of sq33i)t sw+dlqxsp0r ku6 t+gnw:gd:f;4ej) 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 stretch a spring of sprinhdlf/.0tg0jxv10dcot.* c j cg constant 40 N/m from x = 0.20 m to 0.25 m? (Assuf/01 ghv.tx j0 cj0do cd*.cltme 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 initiowdb+nzx3l0wgu , p(ckh2 7c7ally compressed by 3.0 cm. How muu2xol(z,b7d 7 n+hg 0ckcw 3wpch work is required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the tsr,l j7*:ecajop of a 50-m high slope. What is the speed of thjr:,je*7s clae 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 the top of a hill b rpj-2dsis(3 with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be movin3b-(jd2 ssrip g 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 bottou; u c0yf zv9.soeq3w,m, it has a speed of 9.80 m/s. What is s q vow0z f3;.uy9cue,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 0.70 m above the flo/aye c3on my3cei(ng.p / dt/ -5vmlf8or, its potential energy exactly eq-.en/ 85( ladfm/typoy ec 3niv gm/3cuals 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,dqr03pd+bdf qu8 pj ) with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To wqf 3j8u,+dqdr) 0bppdhat 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(r/ex 7fz 5dwqw 7 zjnm(ah+u1 m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to itrz/xd57 fm(wuz7 +ej h aqwn(1s 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 bottoc:, x +8fo*utu ow lxxtu.:+mrm of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaxlu xtoo8x .,+ t::c*mfwru+u ster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m above t ,uww3 t1u vfn1v): z9pux)gnqhe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster a:un)u vwt,1 319z gpxqn)fwuvt 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 bottom of a dip with a speed zi2wr/c0+ah v9dil 7iof 25 m/s (See Fig. 6-2). Neglect friction, what will be t2i dl/i 97ivrahw0c+zhe 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 itsafn+;iubf:kp jt :hh7+ki*rp, 5a0us 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 50bqhvy -d2v i4qu q1b4gmj37q(w0el7v cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed3v q qql7g-ebv m42w(j07q4b1 yhu idv 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 horizontal springn,eoz c38tq 3f with spring cqn8,3of ezc3t onstant 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 stop for a red liezr2 h7 (dkamug./kd )t n*of,ght. What work is done by the friction fordknzah ofm7k .*g(tu2,)/ed rce 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 /g lb/+nf8ei*qw8lng between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/sgfnb / gen/*8l+w8liq, 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, lh6(r* peig1 9h.)1qn4rimpm b /g)n 8ybkxa leevel surface. It has 24 J of kinetic energy. The friction f*l k48gqgir eh 1ye/pbr )himx.b)am16( n9np orce 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 horiz fq+;0/5yqemikuc 0fnontally 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 change in i/ mq n+ik0fyfqce;50 uts 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 nvc,m qm p,,w:;z ku)ma 50-m high slope. If the work done by frictw)m z ,;v,:cu mnpmqk,ion 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 pl(v;)mahv z*no ane. 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 (n*v)ho; mz avplane. 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 releec:rzk2w17r2al)re nlw yq8 -ased from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic 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 l1 kw7r azw) cl: yqe2err-n82plane?

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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 wi20cg c0gnj3h j5(2ws 0oeh uzkd ;7xgmth a velocity of 7.00 m/s. What average force of air frd0h030 o; s 57ggjgkezwm j2h2cucnx (iction 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 he ruh7-gimi8+sa qns up a flight of stairs 10.0-m high, i m7i+shgi -q8an
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 movej vlr nri 1u-0vu 5dbxb9(jj*9/ ephy) an object with a constant velocity of 5.0 m/s. What power must be delivered to the r(u9vu-d/ bj yi ve901rh5nb p l*x)jjobject 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 1.0ykjhv,2ow n10 hr? (1 hp = 74hky0woj ,n21v6 W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while riding. jj)j)a fwf1.j How much force does her foot push with when she is travelingja1f)wj)f.j j 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 7.0 s. What is the aveu0nhfb:8/; f*nt q6enzv bp7w6p-alrrage power delivered by the engihanzbtq6/ -6fb; fen*7nlvwup0 8r:pne? (1 hp = 746 W)

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