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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 SI unit(kny x+t l-6ups?

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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 thmpdv:s z,t)z; r5t .3b+cfjvq ere 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 amount of 9aqa1j9wu uj-ecu9 *vwork you 99-wu auv9ea cqu*1jjdo

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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 vertig z jf+p;afp65(i 0nykcally and is being held there. How much work is being done in holding the box in this position?5a(+0fn; p6 yfkigjzp

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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 veloci j-yk5 u0r.n:bz6glajty carrying a 10-N object, the amount of work you do in :y5b-.0gzkar6ju l js

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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 ;xg+xk m a7sn9returned to its original position. If the total weight is 30 N, how much work was dsmkn9 a;xgx7+one?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an object do work kehrxwc o 87)9:dijx;m: :gjbg b9nj5on 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. v ,al f8d(,gj;dvoun-Compare the sign of the work done by gravity while the u;j8g nv, ldadfov(, -ball goes up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) gras(;-rgp7wlu7 q xw 1t9bt6w uyph, represents tgy7lu16bwq w7;trsw -9(xpu

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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 verjnn1gjk *e 05nsus position (F vs. x), what represents the work done by then*0j nnjk ge51 force F?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is posias2z m*a85uv; cicp a4tive, 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 objhea;ujgv48 -*,qbhq.qjv 8rs ect 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 ob )q: tck w.dh55lgcky.ject is zero, 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 car, and is moving at twice the speed ofm g xc.)-ultlk9l yff(gs)kfmy *2r:, the car. Which statement is true about thekfg):t,u-2 cmsx flk9lf l y m*(r.gy) 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 carl90, k7osddx s J has half the mass of car K. The kinetic energy of car sdlx7,s 0d9okJ, compared 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 andl8rl djg./m2+v)dh w5kv; akd bounces back with half of its original speed. What is the ratio of the final kinetic energy to the 25dk/l hmd8)w ;+lkdagj .rvvinitial 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 f x6 ,mr6(9y/th nrd 6ijrxrc-of 3 m/s and a pebble is moving at a speed of 5 m/s. If both n,6x/6f9h-t rrycxrd 6jm i(robjects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/smh6 k8 )(j 3gzxunncy(. 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. Which object traveln6() g( uhj3ykxc8znms 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 aqbx45j *wkuw+g3ivp y2p3z 6 d certain distance on a straight, leve*pv4pd53b6w3uq yz ki+xg jw2l 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 Sun in an ellipti1e -of6la .a8jq (bxy.h6orb+2 weagycal orbit. Neglecting any fre. -arxya .olo 6h6e2f1 y ja(gbqbw8+iction effects, 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 ch x5t b,r81t9r xdh0uprinciple.
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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 halkmx,y86,3rsw 3 vcbd ve 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 heiab7 2xbv:dmzx, (x)k dght h above the ground. A second object with four times the mass of the first if released from the same height. The potentiazk,d ) vxbab2:dm7(xx l 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 t 7*yei 0beh ik tgq jqd4xiq6z4)5l,d0;hw.fko the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sprinkzh45w;e .jgki,7)il ifh*0q 6ye0d4qqt bdx g, 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 s6p6,bp03kc cc x+jg81n zyqjsystem

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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 K, to itspnzrz x0bcw4i ,- d0;lhc(p:d *a9szo potential energy U:( zc z h* p,;rizcw40apdxns-o9bl d0.

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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 ct9krb)0xz6,y .itf)iux5 ufoe - n,kup 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 dxc.,cym v 2 b+:p:ezfpmc27n and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionlese yc+:n:,dmbcm p2fvcp2. x 7zs 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 y xitp8+d dr73$m_{1}$ 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 conservatvm;dbc ( k89rz )h h,tae;feh(vv l9e(ion of mechanical energy for conservative forces.9e(8h (( rvdb tez;9)am, ech hfvk;lv
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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 buildingo ds0v: *j+kry1/gl.ngzd*e u4 5zb bd, through the air (air friction is present), to the ground . k*1v*gez ns /gd+ld0ubo 4jr b:5ydzbelow. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 30 J of kinet zhbky6,m)y v ehm/5(cic energy. Do not ignore air resistance. How much gravitational potential enerh(ymm6zebvy) 5 /k,c hgy 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 gravitatiozeqm *7wswp 2(u7kibfo2,b5 gnal potential energy. Do not ignore air resistance. How much kinetic energy didbwpg7eu z o257(*qibkfw2ms , 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 conse 3kwde**z2 tntrvation 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(shi2z/rejhca-a iwv7 9t3m, 6yegl8

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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 expre- h8kr x0cbe c.e5r3yqd7fcd/ ssed 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, whichvh6.a hdo :j.x is not a unit 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 in one-third the0cbs *k;/jlkd time. To do so, your power output must have b*0ks/c k jbld;een

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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, thi ocqim1 2g u4t(a(w2de 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 bzlcnkb(,b;,iki3pivvja7/*/i : bj held there. If the object weighs 90 N, how much work was done in liftini7vz/:nbp ,/b ia jl( ckbkbvi3; i,j*g 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 convmp5u8+f*,u jgjuwr :stant velocity of 0.50 m/s. What is the w jv* wumpuf,5+ u:jrg8ork 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 constanekv p/z:ty0rh70v 1wrt force of 5500 N for a distance /0r:v v1yz7rpwekht0of 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 pulled upwardb, 4 t9,3ib.ok1hjo;sjvboht with a constant force of 5500 N for a distance of 50.0 m. What is thb1;to.j,93, h4bjhoi vktbso e 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 constax* vc.jz yo/a.nt force of 5500 N for a distance of 50.0 m. What is the net work done on the elevatorva*oc x zy../j?

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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 90 epiido0q(83tti fgot(6l kalong 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, inclinedtb* vf8 b8mj8 gpl4)tp 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 y* omn3e.1z mk3p,t zvin a sled on an icy surface (assume no friction), with *z3 3tkeo n 1,zy.mvpma force 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 thf bpnpo xueex5o 92k6 oi*/f315axu: le force. The graph in Fig. 6-1 shows the force versus the object6*aif obkxxxon 2 35f1/elpuu:9poe5'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 nzk4 k2 n pl-5g/ckr(vforce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves/2 vk5 k4(nzlrcgknp - 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 directlhz1 v*qhv)*c ion 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 frohh)zl qv*1c*v m 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 objec,80jgu)s cmhet in the direction of the force. The graph in Fig. 6-1 shows the force versushmj80c g,e)us the object's position. Find the work done 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 55-kg cart (initially at fj:d2l(q si0lrest) 0( 2ldjfs:qliacross a 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 (initially at rest),vjoz v7p-o(p across a 10 m level surface. What is the final speed of the cart?zo(pov p 7-v,j

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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 movismg4bvu vsa:wg9- 3n,ng with a speed of 5.0 m/s. How much work is required to stop tg- sv9w vu,m:n4bg s3ahe 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 .x zn)qqc(xi,at 25 m/s, what distance is required to stop a cz() inq, c.xxqar moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propelsi7j+;cm g6w+:xog so2d 2 n8yvc e+ome a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has ;ov 2w+io27yx+dgm6 n+e8j co: cm gsenegligible 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 ly4sy2m/7kuomwle (n-7v2nq a vertical component of 60 N. The force is applied to a box which rests on a level frick e l ln4yqmvy7/mw2uo 27(ns-tionless 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 is shot horizontally ih(vs;ppa, gw ze1 7cf6nto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 czwe a;1(76 spcfv,hgpm 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.ulj6 n;7pwlpvd4t4j y* gm)10twhas+00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential energl1) l*ynpp; t m+j6j7 d40 wg4tswhuavy?

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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 u kux.ii s1.3xbp an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is fric3xkb..1x isiutionless, 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.3s1yr t)yv qq.vx) ,jy What is the spring cyyytrvq ,jv1xq3 s) .)onstant?

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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 pot; qodliv5w 1xwo8j)1sx s gg66wgo6p cq)9fh4ential energy does it store, when stretphwo16jw)lxvs w646co 95 d1giqso)g8 q gf;xched 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 col 9(a alt7vbt(mpress an initially uncompressed spring with a spring constant a9v (l tlab(t7of 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 spring constant 40 N/m from x = 0.2 in xu:*fyl*f*0 m to 0.25 m? (Assfx:*n fy *ilu*ume 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 oy9xjs us/ 3qnnadr +bojf( 5::iv:b8gf 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cm?:y:fauir(jn8xgv+b q nd9o bj: s/53 s

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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 top of a 50-m higz-aw*ha7a+l/i/y uclh slope. What is the speed of the slier*waaa l -h ul/iz/y7+c 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 t52 f-fs ggl)dihe top of a hill with an initial speed of 4.0 m/s. Negle 2) fsgdl-gi5fcting 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 incq5z,v/ gi ft:ulined plane. At the bottom, it has a speed u:t f5zvig /q,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 aw3gsi+y0(bxz bove the floor, its potential energy exactly equals its kinetic energy.iy 3w (zsbx+g0 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 ,kxvqiifz 49., yjss)b,v7otzvz : t7level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy isz z,vbjtv: txo7,4s9y)s7zf v ,k.q ii 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m ldtza po)y9 u:+eaves 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 t 9apty ouz+d:)o 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 abov s1rk ;dpl9spsq/o g-hb:1/rge the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the ogbk d:1q9-/1/phrss gp;rs l 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 p.(9pqe m tak;e0+zlr45 m above the bottom of a dip (See Fig. 6-2). Neglect fri+aqze;. 9ptkl 0(emp rction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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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 a512l9inov,pq qq npl3 speed of 25 m/s (See Fig. 6-2). Neglect frictiqlnp3o2lq i9p1qn v5,on, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its svd6 6iyytu .h,wing (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 a shg)rb4;o( qc3 lk6wq fmd*s/.q ha.end released from rest. What will be its sw 4og.3q qq;d /mhb.rhc)sle6f(*ak 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 horizontal sprk 5 g5/q;9gbsgd g6squing with spring csd/u qgg; ks6gg9q5 5bonstant 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 iq5ci*uer 0+a uqzv54light. What workq e+rizu5* c u0i5aq4v is done by 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 friction force between a 60.0-kg objeu/ qgu( pggqo0hzv ++-ct and a horizontal surface is 50.0 N. If the initial+-u(u hvg q+o0p zqgg/ speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surface. It has 24 J olc4q(myw3, (hv 3m9jxy emw 8yf kinetic energy. The frict he,c3ymy(y4j mwxvm9(8w 3ql ion 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 mass on a les bnf86.vy pjk5c)p9p vel 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 tpj nsp856 bkyc)v9p. fhe 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 hcn )h5wxfny ydx2hx,c4o25/p igh slope. If the work done by frictio 2xnwd4)5co5,xhcf p 2/ yyhxnn 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 plad-9::kvqovks(dhnw .yf)sq,0hh s9o j:w 9y bne. The plane is 4.0 m long and rises 2.0 m. wwvbq:d,ynq0hs.o(odf-9 9 vk:s hsjy)h9 :k 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 rest7swr-uu*a- :m sk , (ovxxq0zi at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the pla:m*k szrs0(- woav7x xuq,iu-ne 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 y .;h2 f9u) gao5fnhs kul9z5yheight of 10.0 m, and strikes the ground with a velocih kou ufsn2y9.fz;yah5 95g)lty 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 hv b.ez-v;f+tve runs up a flight of stairs 10.0v-+z .tbvev; f-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 conwabm3ihcde 27m87h/ sstant velocity of 5.0 m/s. What power must be delivered2sw7h e /mah c7db38mi 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 hr? (2pjukr)apn (zc a.szdk l+4 731 hp = 74 dc.2kk nplr3u7zpaz s a4j+()6 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 d r-:iwf-b7bsthe rate of 500 W while riding. How much force does her fosibf-dr:b7w -ot push with when she is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average poqdd9fr do6,*f wer delivered by the engine? (1 h9rfd* q,dod 6fp = 746 W)

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