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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 e xcg/e8 6 d99efdi rm,1jbk+amxpressed 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 systba*vq/a/ma. qgtmy28ipa a4 )em 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 stationtyd (vcxq:i*7.2txmhary brick wall, the amount of work you qdc.:*ty ivx(m7xh2 tdo

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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 vr.ju0*rxn7z; mtp -mb ertically and is being held there. How much work is being done in holding the bojb;pz 7unt .-mx0 mr*rx 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 forwa(8uxxf.:8xo o4 wf fv1uro4lmrd at a constant velocity carrying a 10-N object, the amount4mx u xrffoxo4uf8vwo(:l.81 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 vertically 3.0 m then returned to its original pok299m8 8cz sj3hmuj okumz k3s8jk29h jc8 9mosition. 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;a; lfcj(2pgd) o q pbhu7pe8* 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 done d zzz7f*n dhyup xt.:m6:4mx;by gravity while the ball goes up with the sigtn y zh.:7zmd;mpf*dxuz: 6x4n 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 positioi;z sp7bp1o,jn (F vs. x) graph, representsj;pp b,o7iz1s

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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), wh:y2swfvkse pxyzakc 4,v.x:d u u.++6at represents the work done by the foxf.kx:+ cwy: v pzy6vu. ,a2dsk+ue4s rce 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 objecevmqs.5: -0vf-w2vg3fygo f ot is positive, 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 negative, then w2 zvf78+ck:0ci jvzbthe 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 ob uv9 l6p xnjv.f vzdt38j(*ls*h.itu8ject'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, and is moving at twice the speed of th+s ;dwi 68gityo++xije car. Which statement is true about the truck's kinetic energ+6;gsidt ix+o +8 jyiwy 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, qmd5do:6+mfipn (u6r and car J has half the mass of car K. The kinetic energy of car J, compared to caip(qn+ d :odr6umm56f r 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 half of its original speed. z6 8k(e +hjxtn3,avvgp 0(pm b What is the raavn+ jxe tpmhv3,z0(8 bkp(6gtio of the final 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 of 3 m/s and a pebble is moving at a speosy)8i gb3/z/c f sh.-sdi0p q4 d,qy3nszr(e ed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock 48b3zos0y)d (pi ys3q//sgzidner. h,-fqc s'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 m2q,0ja3cziw xzw )iu( /s. A 1.0-kg mass is moving with speed 4.0 m/s. Bot0 xi3iq,jzzu)ca( ww2h objects encounter the same 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 as3cxuhfs-*h tqh(6 -of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, wh3h u(qh*s-ac fsh-x t6at 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 9 sybkkai/+ ;zc0ztn rx9n9w )the Sun in an elliptical orbit. Neglecting any friction effects, what happency9 z/iwask0tb)+n9n 9k;zxr s 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,c 4v )cyx-7)2 yomzfxctgw8f9 l b*zk.
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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 energyq(k:xkkm 9m6xg02yf*a ah) ks?

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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 ground. A second 7z:gr(p bm+o: gxir.wobject with four times the mass of the first if released from the same height. The potential energy of the second object coip:oz7 +rg:.g(x mbwrmpared 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 828krh ilmmkockd3-8 of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is addd82l3krm i k8kcmho-8ed 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 a sys 6*/vyqff7:j5ewna rct6+ nr: 1rj4deeftc/item

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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 Kgosq1* 7ql u izka75k,k6e5yq, to its potential energy U qa75*kkq76z ,sqlki 51geuoy.

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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 d o3s2esomg+4driving 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 y :rvujl-a v0) v1ndy-are sliding with equal speeds along a level frictionless surface. They both slide up the same fr-a- vvd:n u1yljry 0)victionless 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 j p0xq-.lix :g$m_{1}$ 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 t**j jchyu 96afor conservative forcesutcha*j69 * yj.
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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 friction is presexe,ni+ co s*x-wp:bm8 nt), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at,nm*sp-8x coxw+ieb : 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 kinetichto2ch m p-q1x:+,zju energy. Do not ignore air resistance. How much gravitational potential energy dmj-:c p12 x+zhq, otuhid 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 fi o e)zofo1i,eg2(5 qenergy. Do not ignore air res)(zqieo fo5og 21ief, istance. 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 ener9ihrxzd .j*73r6vows gy.
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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 isdn ts l2;f ,f)qtp+z*psjz70 o

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressed in SI unop 01cj/czv) tits?

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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 ua30r7nmq p+ fmnit 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 inj83-q c-lw ,fe)hkv(tdi, is f one-third the time. To do so, your powerik-q, vj 8sc wi3fel-)dt (,fh output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's ef)n*/ggjpozeo - l5a9ngine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the object wegs hugm4v0z0 m-rdd7t(l9k7 d ighs 90 N, how much work was done in lifting dd s 7mzd9 0m(-hr4gtk vlg0u7it?

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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 rl4loaa+lri 59:mj(v7(x sjs book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. W4 l:av(5 9rl(ras7o xij+jslmhat 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 upward with a coqac*t(5ltcvv0 v,a5tzm5 f u 1nstant force of 5500 N for a distancqtmvu* 1tavav5 z( ,5f5tcc0le of 50.0 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 pulle m297ykoo f ac;7cl,p2pwt8ihd upward with a constant force of 5500 N for a distance ofomach7 28 w,oy kc7i;pp9tlf2 50.0 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 dist.*d k0swbg4gc ance of 50.0 m.*g0c.dw 4 bgks What 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 6.0 m upay2w6+ ohlxxdinco bc 3et+d: n+ m)nah v-.;9 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, incline p:1 8jnfyj4jjd 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 i2jz(cb+s6ad:si z 9ql cy surface (assume no friction), with a forc(zils +bdzj6s 9: 2caqe 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. Th*i*hgch .;s e8wqwu*qe graph in Fig. 6-1 shows the force versus the object's position. Find the work done qweu gqhwc**i s8*h ;.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 objeh;iic9 d 1se(vct in the direction of the force. The graph in Fig. 6-1 shows the force versus ;icsd1(v i 9hethe object's position. 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 una+sbn3in ,4the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w,n 3s+nibun4ahen 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 tlwuq 8/pcc9;phe 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 lp/ wccqp;8 9u0 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 h ( ey,ptdkvd.lh*, 7xa.yma +N is applied to move a 55-kg cart (initially at rest) across d .xeamp( 7t,hla+vy.dyk *,ha 10 m level 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-kg cart (in*04sz cghi, gq2, pxvgitially at rest) across a 10 mcgisq* 4,gg ph0,vzx 2 level 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. How much work is required to g* j7geg.d+ ;fg-kmihr 69tq bstop the hd9rf*7-gg g ; bij+g.eq6 ktmmass?

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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 cae7zd 9x-7pmi kr initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under zx9-7i7kpdem 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 g fie.o8thrb/;un propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wio.tr; i/bhe 8fll 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 vertical component cnrz4;ngf(i6of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and mov4n 6rgciz;(fn es 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 is shot horizontally wb-hz wfp8 37jo9au(b c4gvy/into a bale of hay, striking the hay wwco9h v-a4buwy78f3 jzb/( gpith a velocity of 60 m/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 height8-k*:g5s1rk iso(6-dyz wi7 csf8 zeluk7ela of 13.0 m above the floor. What is the change in gravitational pote-75* fyuel -kka6lc(s :178se dworisigz kz8 ntial 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 n89cprs5 ;joaplane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by nj 8;5rop 9csathe 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 strt37yx ver+o 7uetch 2.0 cm. What is therxu7o +7vy3te 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 much potential eiqw;0k:s juz8vg)a4ty0x 8bsnergy doji0x y:0q)s bgw8tzsva4 uk8;es 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 compresej.xoz :2kl1e,e0 6xq p) nmbks an initially uncompressed spring with a springne:qbzx leke.j6ko)mp2 0, x1 constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of sprvc wsts4hfk8bc8- )(w v 1pid+ing constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)t1wv)fw c bdss(4 hv+ci-kp88

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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 initiy5ll**cl3m 9 wbyyfog1 0+e chally compressed by 3.0 cm. How much work is required to compress the spring an additional y3ly1yecf+ *5h c wbl*m9l o0g4.0 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 - 6zor,q+9d jrhy )jrutop of a 50-m high slope. What is the speed of the slierjjy 6h9dq)ru+r z-r,o 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 with an d cuj1j2x;q2gr 2,imj7q4 *aunif6lr initial speed of 4.0 m/s. Neglj; fdmqrgu 2*l1njqx2,j u24c6i 7r iaecting friction, how fast 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 both,j+li l,8q7 spa./iuc).:t c yae z-f jvc3jitom, it has a speed j,zeaacu7.v)iilc 3:qtslf8ji.y- /+ hcjp, 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 0.70 m above th2 x usp70lop r; tdppn1g9/ns8e floor, its potential energy exactly equals its kinetic energy. trnpospp 1pslx08gdu;n7/ 92How 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 1 :zf9 jj 2gh k65;mvjzk5jktpsu-n2*w f/q vr30 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertic2j5g -2;rkh / pjftu9v qj65jkwmz :3n*ksvzfal height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of 220 J. ,keoe*e3:xayjwdx9i:6 we, a At the highest point in its trajectory, its kinetic energy is 120 J. To whx 3x ,,koje6a*:i eed:9wey awat 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 stabg, zs.y9crz e kg8:m6rts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of thegze cs.y8,m:g r6z9bk 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 spee24y /xl;dxqp+2f mb:3 ccjmyxd of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller cf3x my :2 x;b/mc4cjy lx+2pqdoaster 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 bottom of a dip : x* rnu+w84)9uajzu b)evwsm with a speed of 25 m/s (Seeubj8mvu)+:r w 9sewaz n)x *4u 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 9s:-uoo3cui*jit fi. ball at the bottom 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 pendulum of length 50 cm is pulled 30 cm away from the v2fo3 bluf/b.dppk 2 g,ertical axis and released from restfu2bbgl ,/pkpf3d.o2 . What will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncompressed horizo,p 7p:2n-mw kunad4cantal spring : pak4 -m7un,pc2 nwadwith spring 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 epw*j9.rbjh c2zmw j:zs9j -- 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against b p:-*.jr hm92 zsj wez9-cjwjthe 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 u19 csl:k/bc robject and a horizontal surface is 50.0 N. If the initial speed of the object19ls u:c/ crkb 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 r7i )zsm/3atmc ough, level surface. It has 24 J of kinetic energy. The friction forc7a3ts zimcm/)e 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 mash4e2ewg8xgo0;kg- d x 2rktd7s 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 its kineticx7hgg kw gd4r0x eko28;e-d 2t 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 3 :bd,idee lvr shgjf* 1i266efrom rest from the top of a 50-m high slope. If the work done by friction ir 6dih2f6vld,e3e: *bj isg1es $-6.0 \times 10^{3} \; J$, 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. Thqgbn-1vw is.tipx:fs7g l3b-5 q+2b be plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the tbif2t3sqb -bw qigsng x7 :+b-p.1vl5op 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 from2fax/ rdbjt z9c v9,x)tikl,/3hv skvq*o.8 o 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. Whavxx,bq.c l8j9/ t/ v*sa) fzv2kkrio 9h3dot,t 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 frodxl0a a6 8no ,ur8jng6m a height of 10.0 m, and strikes the ground with a velocit lru6 6,dgnx 8j8a0naoy of 7.00 m/s. What average force of air friction 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 runs up rf7s cbxa,s* 93;kh6 9)axvbpunn4afa flight of stairs 10.0-m highvhbxfrupf9* 4b, as9x3c k6 aa;)n7sn, 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 m/s. W qc :)d4t0v / k2ik;:imitwddahat pov;t/qd aidi)t4cd2w i:m 0kk :wer 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 used by a 1.0 hp motor that runs for 1.0 hhsc f1c2gafnagao;vb . z/87 x.n,5cur? (1 hp = 746 W2x/8;5nfco,avu1ab.a s hc.g fz 7 cng)

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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 atei.dknjzq(-alg 9gdb4 v2*q d,wr op2 4t0ol) the rate of 500 W while riding. How much force does her foot push with when she is traveling at 8*2.,dir(2l4ngbv 4z9 qq0oj-) d dg wek atopl.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 idp tw c).14 m3cio9 +gz5mjvihs the average power delivered by the engine? (1 hp = 746 Wccj 43g toi v5m.mwip91zh)+d)

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