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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://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://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 work r6s .-: mnpz5tl.4p3kine al1q+uvaj 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 v q;t62riq4gathere 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 walu2m l1 wr/hg2pq:sniqqz-r8;l, the amount of work youqnpuq /s;hq1rw:282il gm- rz do

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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. fs ;i. )5b8vtlbpsoz2a9t oz7 How much work is beina ipov 7zz5;. )t8 o2tlsbbsf9g done in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity ctgss1)su yy w6c3 4+s d6aoe-zarrying a 10-N object, the sgw-3+dsuy tsy)e16a o c4zs6 amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted 7 nn vw)3zka51coo zkul1t7w*vertically 3.0 m then returned to its original position. If the total weight is 30 N, honw5z)lo o71kvc* uztn7a3kw 1w 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 arl ; j*1+ckhh4o2r zwvn 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 straig gmm 8s3hwnfvv,.zw)b,/a h6rht up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes /, f.z3 8w wasmhhrmvn, )6vgbdown.

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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 (gn/k36)j bmtyq pt c1:F vs. x) graph, representsg3/)cty6tmk :j 1b nqp

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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 versusd r9pjis26y t2 position (F vs. x), what represents the work done by the fopytdr 22ijs9 6rce 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 objmmbolu5n.c4s 2na( 8bect'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 tbb/c ayr0 )xtrh( td(+he 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, th ;ps dlov*gv/2en 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 mu- yo75 t+xlnivch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy co5 l7nvyx ot+-impared 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 o 9qsx;-mad6r J has half the mass of car K. The kinetic energy of car J, compared to car s9a;d-6qxrmo 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. jn9; dw kc-9-h0bohku What is the ratio of the final kinetic energy to the initial kinh bd;kwu90h9n c- jko-etic energy?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 an ua:)d.uukidc-svob/)( 4v 9a-kn q d speed of 3 m/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 brick'sub-d-d9)/sa(4 ko i nvnkucu dv )q.a: 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 moving wit cvis+ 8y btg- iu5,;,fd1k-agbm;lwr h speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whicsyi1-r dbu+8t5ml v fg; bi k,gwc-,;ah 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 tvof6) r,q4nnskid a certain distance on a straight, level road. If yfn4nvq t) or6,ou 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 thzh7nx7f242mlw -rpvv e Sun in an elliptical orbit. Neglecting any friction effeml-r7 v x7fnvhpz 4w22cts, 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 principleyuu 5m/*ivl o+t9we17dq s i:v.
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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 pote-*j em8rje5 mi6ylv 7vntial 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 ground. A f70xduu jc2nj .j4o(isecond object with four times the mass of the first if released from the same height. The potential energy of the second object compared to 72jnoc x4d(ji. u u0jfthe 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 okr*cv0;ky1ce l 3viw4 f a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the springec 0klcykv*i; 4 1rvw3 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 sy7:pdj6 po)r8 ws-gi jfstem

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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)o //gi/ lvd taqr*g5hcrj;e. energy K, to its potential energy d )o a/gl;trevr/c/ jgh.q* i5U.

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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 aka s7k8niz// s:(wmlp car driving up a hill.

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 heab en4,ekfke 82vy object are sliding with equal speeds along a level frictionless4 ebefnk,k8e2 surface. 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 d6r8pfatgt ol.,g swe6t.v /6un4 po* $m_{1}$ 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 mechanqa ,(hl xnp/v;ical energy for conservative forces.a;ln(h pq/vx,
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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 t q7rnsyb(l9:mhe air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the groun ys:q7b r(nm9ld 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 ofarw tjq+cv, +8gd 6w3z8a mx6j kinetic energy. Do not ignore air resistq66,jcag8md3vra+wj xzw +t8ance. How much gravitational potential energy did the ball lose?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and loses 30 J of gravitationhmmg7v xa y1 +6()h n-u zzapjw16b1wyal potential energy. Do not ignore air resistance. How much kinetic energy did the yjwy v7g1 61 -w1)xnaa(mhmhz6bp uz+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 energoxn-ti icrtpa/u13v j.k9 h2 )y.
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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) b5mdp9hgf k2 as8fj:

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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 expresse zi+gtv 9iw-kfimzv9 i(:4c-s d 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 power?.hw 4nm fhs9z8

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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-tu- .o*fccvoaex/c8 2jadky +7hird the time. To do so, your power output musyca cfxk- douaejc / v8o+.*27t 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 cara9yu7tfg*4r.2 a+ ea w;9x;hjmklvt:k- qkye at a constant 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 vertically 2.0 m and held theriv 3bu3 etwrpf(bt z*; r4zn .kb0:zc0e. If the object weighs 90 N, how much work was done in lifting t0r4f3c;uz.kni rzbtvzb*3 e p0wb (: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 cosx, p2p.cqg (jnstant velocity of 0.50 m/s. What q,g.2xp cps j(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 const1pw8 zft ha,9dant force of 5500 N for a distance of 50.0 m. What is the work9zpa dw 1f,h8t 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 upwardu 9oyyb tyysayq+)*qn9 21oj1p( b;a q with a constant force of 5500 N for a distance of 50.0 m. What styqb+*q2o yy) a 1po(;ua y9qj1n 9ybis 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 qd (k zj,wz-n(51f 0 osrnbu9xa distance of 50.0 m. What is the net workn(-5jxfo (wr z0,1 ksuqnz bd9 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 u; nne,g9s4jq 4ijn+cfc fgo f6,2+u afp 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 slidciaf51 b92)nfqq.2vt b mxj85i*k esses 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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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 sl t+d yx5:ldyd8ed on an icy surface (assume no friction), with a force of 60y:d5dd tyx8 +l.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. qztw1l7s3,ebys* k/ g6-1 shows the force versus the object's position. Find the work done when the object movs/lt w7e* ,b1gszyk3qes 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 s(isi.6zccku u8e5k c 0tl1iwb(j5c6 in Fig. 6-1 shows the force vetlw( .8cs iicc1es50k jcz6k i(5b6uursus the 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 the direction of the force. The gro frfn 80w;wz9s7d0qfaph in Fig. 6-1 shonw0r 7d wsz9f8q0ff o;ws the force versus the object'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 force. The graph p,,a)j jez wej.vu8,w in Fig. 6-1 shows the force versus the object's position. Find the work done wjj) e.,vuj8wwpzae, , hen 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 55-kg carm2 fh o.myy,-i y1f*jat (initially at rest) across a 10 m level surface. What is the final kinetic e1m 2y-y.m* jf af,oyihnergy 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 (initially at r)7mno on. d6wpest) across a 10 m level surface. What is the final speed of the cart?7)pwn o6o n.md

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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/si pp*.)8or1w.ut n ths. How much work is required to stoprn u 8h).s1pt o.wtpi* the mass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially moving at 25 m/s, w4m8nut :g7 jxbhat distance is required to stop a car movingju7n :m8 gtbx4 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 6 xlva-s)v)sc ,rdj)jgun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. Wit -) vs vr6x,)jjals)dch 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 vertical compon 7exbmj4+3 q.usjp-hlent of 60 N. The force is applied to a box which rests on a level frictionless floor. . qspmlux jjhb3 +-74e 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 is shot horizontally into a bale of hay, striking the2wbrq-.z krba;+ 1k is hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acta-wsq+ r.k 2bz1k; biring 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 heigh w 3 (lg/byqbeaiir52m+6o1pz t of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational 1ipw2geyq+zio 5a6 b/rl b m3(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 4.0 m l l:uehszot l5h-8f-m)ong and rises 2.0 m. If the pla m-ot lh-s)uz85hl :efne is frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. What ioi * qp44*bllr r6lu1js the spring constan16ir*u4r pol4j* ll qbt?

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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 6+m1fnhdqk15ocfn-*qp si/j eb5+ 0kg0 N/m. How much potential ene-ojsp+gch1/qnfqe5 f*50mk k1id nb +rgy does it store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work requiredm0xo,;q u(mb j to compress an initially uncompressed spring with a spring constant of 25 ,ujm0m o qx;(bN/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 strlul,7)6 ziw ;/mrn gbcetch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positi 6w,n i 7u/rz;)bmlglcon 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 spri s2hzv*v5zr r3ng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.vrz* vsr2h35z 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 ycsq suu,w1 9oq*2k2bthe top of a 50-m high slope. What is the speed of the slier on reaching the bottom of thes*q92 u1u qcbko,2syw 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 jbc: b 1rp/j7 * g5w2z4;zqqghfu bh5dwith an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in jc ; :q5g7b/* hrh bg5uzdz1jb2q4p wfelevation?

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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. /wu)p1 i, nagf At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the planef )pi a/wnu1g,?

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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 1u,1st3;pg59g8w y +ewyhs iyjt :ref is 0.70 m above the floor, its potential energy exactly equals ir ghsp:u9ee+, 8 tty5y1wi;wy j fsg13ts 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, blgog5kyq- q5 xuo) 40qrasts 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 vertical height does0)o4 - q5gy5k quoxqrg 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 leabae,(-: fu*rrayom 2t ves 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 heighafu em-,ro *:(t bra2yt, 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 starts from rest at a point 45 m above the bottom of a dip vh9 acq( hw j);ca.*md(See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m ab.h*wa; h)v9 acdj(mqc ove 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 xt y.d cb/yc*3a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coasterc /y.xc*b3 ytd 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 06ov;j5uoyn3vhh a( gthe bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller co(au no0g6h ;y5hvo jv3aster 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 swing5m nf qx +ei5oeb3nqj h;cv8fc13d: 1z (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and releagm/i ho 92k*hbsed from rest. What will be its speed at the bottom of it /ogbh*ihm 2k9s 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 initicf +)xef0az( wally uncompressed horizontal spring with spring constaf c+)z0(fxwe ant 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 t 7a2.pb 9kpg .1hoqpel77ptyco stop for a red light. What work is done o a9ph.g p717p.te 7qk c2plybby the 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 frictionw69xt+zs f8boe g+; ri force 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/s, what distan 98swzof+eg+t6x;b irce 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 royosp)lvi*a. y f/c5k)ugh, level surface. It has 24 J of kinetic energy. The friction force on itl.vcap /)o f )k*iy5ys 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 applineq 8aggm,sa r+z. e8-ed horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the suq grs .+ag meaz8e8n,-rface 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 the top of a 50-m high slope. If thes4w (0w4o fgdq work done by 044wq fd(gswofriction 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 incll1ku3g6dw*i4j + jdbrined plane. 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. What was the magnitude of +ddu3bjr14 6*igwlk j 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 rcg2pgfjq4 7f*sz*mz + p8ed8qest at the top of a plane inclined at 20e above horizontal.pg 27d*gz8e q*+fzmp q4sf c8j 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 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 f+;lp4).agf6n(htw bkx b9udr rom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on xd wgrk)9+.hnfba(6lptub; 4 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-;jj3pt,9 6q xrift/xz kg boy using energy when he runs up a flight of stairs 10.0-m xt j;/63zpjqirf, tx9high, 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 mrnm 5 4 qaih+cm53nd-z-xn3d oove an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the3 zm5 -+rnhnoinxc5q dm43ad- 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 k.bexia+ 8pr-1tks,5 k jk0zu runs for 1.0 hr? (1 hp = 7kkeb,rspazk. i0kxu-58 j1+ t46 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. How much force do*p6. inb i/tjp ao/ve)es her foot push with whe .p//ai bt6nio )epj*vn 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 accelera8 c qclp8x0i7ztes from 0 to 25 m/s in 7.0 s. What is the average power delivered by q8c8px l0c7 izthe engine? (1 hp = 746 W)

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