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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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://autoconfig.5edu.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: admin  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 unzxwooe+ .( ec rm2vv-*it 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 5m.hn j*0/:)gfapvk rhux0oais 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 stationa)lmv;+ ll6f d,lvxf 0vry brick wall, the amount of work you 0lf, vfl + ;mdx)vll6vdo

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is being held there. How much wor-z qr atf-jm66k is being done in holdjt66 -zqmfar -ing 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 arhn8v0 o 6v: 4tzj,woma4hju9 10-N object, the amount of work you8hozr: o huvt,an 40jj49wm6 v 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 li s k-rl3a0myu.fted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work w rlu .-am30sykas 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 fo5tfra*pets0c v q1z /5rce acting on an object do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work do80zy,: /4xmgf c:xin gq8noyu ne by gravity while the ball goes up with the sign of the work done by gravity while it gxifqmx,0zo 8 yu8:ngy/: 4c gnoes 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 positio4qk5lvog)l 4 lkrtj -,ysi:8en (F vs. x) graph, represents jeko-4 qkrl)85i sy l:l,4gtv

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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 ver1fq139ha nzd ksus position (F vs. x), what represents the work done by the force 1qfzd9n3 k 1haF?

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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 thoxiwh*nmakx;34 .r. 4wwc+n g e 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 objectt0e tnypx2,*k yziw0; is negative, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then the obaktikyty4 .l8(5 m ba7ject'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 a6lvho.0ybzya: pnwv ek/;gb7(pd2y6 car, and is moving at twice the speed of the car. Which statemenk6ab.;7o vy2h 0b/n p pe(:6ygy dzwlvt 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 half the mass of car K. Theqq6el3o/ zl4n9/he gx kinetic energy of car J, compared to car q6 e4 x9n lzlqg/3o/ehK is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half+b9b**epgsh*x0kz(fcr bj k 9 of its original speed. What is the ratio of the final kinetic ene9crg 9x(sphb*k* ebf+*k0 bzjrgy 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 aol4dl6vi( wv 144j vtkm)(lis pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?os4ilv)lmw4d 4( lk(vj 6tv1i

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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 a2-(42f joyfroi/ u z/-fjna45jcojc 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest/jz5j2 yf-no/fiu(ojac 4 fo42rjac-. 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 on af u0zfexo/4 d-peh:*kno1 pl 6 straight, l /oxenep1d4:f0f6 o z*kp u-hlevel road. 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 dr9ll;u4 cty) Sun in an elliptical orbit. Neglecting any friction eldyr4)u ctl;9 ffects, 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-energy principcyvkqd) 2nq1nd8)dj a/ yn ;)sle.
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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 havebx4,97e*hse nott3 r zh5 +qgd negative 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 height6we,4 ,hnf -a yz4h;um;;et xfav4lo n h above the ground. A second object with four times the mass of the first if released from the same height. Th6uv4ew, , tomyh ah nal4;;fz;fen-x4e 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 strgo a3vkeq(9fo *xn7g )etch 5.0 cm. If another 0.200-kg mass is added to the spok eo3nf( 7)avxg9q*gring, 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 gi:xpve(sl y): 2l(kjof 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 swt q-m:qr lt 9 gv+g(q-;,nvq10mnzd kinetic energy K, to its potential energyt(zv-tqm qn1,90-+vql mgrs dq:; ngw U.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car driving up a h+):ud21fxosd bt/a)o3 o sggeill.

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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 objxszi zqm 44 r 8g;shsxm.g-ex hf;66)cect are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greaterqrsegx ;c-m ixxh86.m4 f);gs zsz64h 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 awxq 9u 6p66u ssoo pl 3l3pm3jp,o13b$m_{1}$ 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 f.i)1vcb3 jx i d a8ns7ow wkamq z2ks;q602h3mor conservative forces km w.d023bk wiac3 2qz1x mjn7 ao;)q68shvsi.
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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,/ xzhqxgs(nfya5:yp8 h4 ph4; through the air (air friction is present), to the ground below. How does the kinetic energy 4 fyyzxgx;q ns5h: a (hh/84pp(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 ga1mz d9c/n euu89jho3uins 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energo j91ez8 ndhmuuc/u 39y 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 h w.yf vhvt b 4jm3g,o0*i)g+ynup-*5l:nbiwpotential energy. Do not ignore air resistance. How much kinetic energy did the bah **b+jwuby .gg)0 4iphmvwv5:n, -il ynfo3tll 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 enzgy nt-3x8v z 8qu(vv2ergy.
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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 isq+ g6o:bliz9qj 1d ewno:(+zn

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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 3moi0j)5p xnf1s miyi9sxo ,l;ywn.; 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 of x,/q8lg+b9kdq clvv)l g7a *zpower?

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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 in3q+.z e0 ar7mefbx) zj one-third the time. To do so, your power output must hav m7e.)+0ej3 qz baxrfze 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 musta09 c(fdyqjo0fg 5s lv+nb2pbeq ,1l;

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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 weighs 904 : 9h+ jh v*)0a/efzhyvgbzjk N, how much work was done in lifting f*k4+0eyjva hgj h 9)bzh zv:/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 constaj91qh5x vsz;)b +z(zdz +imzyito+ c/ nt velocity of 0.50 m/s. What is the work done bd+o1zjzs+zy (hz c9vz x)5ib+i /;t mqy 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 force o9-l/s xfa*hsy /ve 2rxf 5500 N for a distance of 50.0 m. What is the work done by the 5500yrsf2hl9axex/*sv /- 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 upwa1 mubz pya q35/.psp81ci8 jdcrd with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weightp 1bu8pp18y5 3z/qcjdsca.mi 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 f(aqukzek(pq ds*w *)84 cit+ ror a distance of 50.0 m. What is the net w4cq8u()zt (s*ekq aiwkp* dr+ork 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 64vmwv *t38eh:d:ei e*. zxhcn.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, ia-vuadwj 8mb m mrapv*9 1:,8ynclined 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 (9hogh;erzl *9assume no friction), with a force of 60.0 N at an angleo r9l9gh;*h ze 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-t:jq)ck*cdh9;j z 2dj 1 shows the forj2qtc; zh9d )d :ckj*jce 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 dirbz (9 k/2fptmgection of the force. The graph in Fig. 6-1 shows the force versus the object's 2m /gzfbp9k(tposition. 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 direction of the force. f ,0g53 tpavhtThe graph in Fig. 6-1 shows the force versus the object's posi0g 3th,5atvf ption. 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 lv 7:sm2za(bx.vt v)v the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work dz 7vv.x:ltb sav (v)m2one when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 5mfjweju6g 24q(vexlop: 5/ ) v5-kg cart (initially at rest) across a 10 m level surface.puvg5 wle2ovjj /:x6f(e4 q)m 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 s zclyt , u,7rbgzd0.b-, c5lfv 9q*icmove a 55-kg cart (initially at rest) across a 10 m levelzyl zv0sfq5tr*big,c7uc ,,-c b l.9d surface. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. Hv3rd(*vzk ( kvow much work is required to stop the mdv(rz3v kv(*kass?

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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 carmes 79 cd3m0- qhdqupw3: r1yu initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition?9rmwuqu y03 ed3q-:7h c 1dsmp

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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 bp8tjny4,de j*um5x 1 fy exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leajd,ujm nef1t*8y p4x5 ve 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 ri tvgnatfi2j.tie2 wd/wk xv k0- u;2,11- caN 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 is the cart's finalda2-gx; ck t-nt0 .jir2/vwatevi,2i1u 1 wkf kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of hay, wu39fkf5x:2bdn(zye 5( .x1 ymrwmnc striking the hay with a velocity of 60 m/s. It penf1xw5.ymd:cum(z n2xy en fk 95bw3(r etrates 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 fr(nkx7 d 2v*ntmom a height of 7.00 m above a floor to a height of 13x2 dm(nnv7t k*.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 ioex,n7.x hw c32.rof513ywavebwu x*nclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much woo x.7he3w.1wvycnrfe xu ,25owa x *b3rk 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 sp kr86 x-bob+on; 9 mnrzf;0qkfring, causes the spring to stretch 2.0 cm. What is the-9z+rqf8rk nkm f;6b bo ox;0n 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;ncv1i)m. ddj- fp(ae-x - mvd constant of 60 N/m. How much potential energy does cpi vmdm.(ne1d-) - -jafxdv;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 uncompressed spz jjwl; o8rmpa( ah+/.ring with a spring constant of 25 N/m by 10 cmp(.h/ao ;+8rlzmjjw a .

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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 40 N/ f(,ffyeobo v8fkf0+0b7mgj,m from x = 0.20 m to 0.25 m? (As,f87bg(f 0fv mkef,y+0 ojofbsume 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 ofrcm5*0/cd l pv 15 N/m is initially compressed by 3.0 cm. Howvdc c*05/rlmp much 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 frox,n)92m;jl0ct+plxo fkx 2bfm rest from the top of a 50-m high slope. What is the speed of the skier on reaching the bottom o ,mlx lxcj0; xfokpnt22)f +b9f 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 ofr0j b4 a8ommf+ a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving af abjr0m 8om+4fter 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, 7*-0rxvfet t.eqs5oe c5f+lh it has a speed ot 5 tcs-evqf*.r7+0 5fxeholef 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 0.70 m above the floor, itsz,r1hw7r e /h yr/d0zh potential energy exactly equals its kinetic energy. How fast is it movir,w1d/07zyrhr he/ zh ng?

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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 st 7 fsy*k/ol*b0 ;df e/j*zkhdlraight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 14l*hdf/fl/z byjko ;7s d0e *k*0 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 withl8:ycud b1guc-67epb ek ; i2s 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 its launch point, did it rise?18c dlpg yub;e:- e b26ics7uk

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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 455 - n5d-b8ststze:ngts;qx 5b 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 th 5tbns;ezd-q5s x-b5 : sgn8tte 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 ab2 4wk;yg4t lkkove 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 is 3g4ylkk;wt k4 20 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 ),n+n ou :4g 6yexyc9hyq.ggcpoint 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be t , .:n yynqehgy4o ugcc+x96g)he 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 bottomo6 -z3ib.c.d ppu ft4(vvv)fs of its swing (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2-kg pendulum of length 50 cm is pulled 0.23 m awa35fr/ jwsj2dnchycg3 vx jm(/l,y1a )y from the vertical axis and released from rest. What will be its speed at the bottom of its swingj3y1 / msj) ch5v/2y(r cgf3jaw xnl,d?

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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 uncomprg gd, tmn;a0b8essed horizontal spring with spring 0n8a,g mg ;btdconstant 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 caruuj9x0hld5 w;y z jif.6w e:p5 to stop for a red light. What work is done by t:wuz9x 6f id.uwj;50j l5 pheyhe 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 surface iiekqek ()8sw 7gb8qoa3 zfn05s 50.0 N. If the initial speed of the object is 25.0 e7 fwi8g(be5k o0 nqq3skza8)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 surf4 smo0xwq6cwl w9 aw* qs wfg3m+*;1bpace. It has 24 J of kinetic energy. The so0 pws a;xbw * mcgwwl19w+m6q*f q34friction 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 ma hpc2-lb g5 vzqw.b9h/ss on a level surface. The c hpz9v q.5/b2wb-hcgloefficient 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 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 fm7 6b o-2e9rj1wjo xuthe top of a 50-m high slope. If the work done bo1m6feox27rj- 9bjuw y 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/ ipgf:8cw+ ic ):wkbe up an inclined plane. The plane is 4.0 m long and rises 2.0 mk:/wceg)c b+8: i fpiw. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the tolr ae+c;j(bs7p of a plane inclined at 20e above horizontal. The coefficient of kinetic frictiorbc;j esa7(+ln 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 heigh9kpc,kl.v 5 btt of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frickklcv.5t, p9b tion 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 whe6(l.a qywv3kl n he runs up a flight of stairs 10 q6v3wlay(l.k.0-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a constant velocity of 5.0 m1-uott4zauj )4dtlg:e*y1 r+ rufogwke8 53p /s. What pow1yk5 w+f-zet : 14gorjpeu3at4 olutu )8*grder must be delivered to the 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 usedp.r k aq.3ko ftprq f33+ j 9sc9;pkra:ps9+ic by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W rq9fs. pf9++p3rtp ps c9rkkoci3aa;:. 3qjk)

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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 hxyk jovpt 9v9*;/chwjp;0cv,wwms) 8er foot push with when0/h t 9vcx;*mocyp8 jwkwjsp9, wv)v ; 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 7.0 s. What is the av72wy d3zr3ttverage power delivered by the engine? (1 hp 7 vry2wz3t3td = 746 W)

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