51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫，访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp，上传完成后会在上方生成预览，用鼠标连续双击缩略图，或拖动缩略图，该图片就被绑定至本题，显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片，绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


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

标记此题
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 i06 w4eq9ufu+e1 x 0 oe-gyvjzq1dk vw0n SI units?

参考答案:    
标记此题
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 is no motionkkrrn 0ubxp0f;/,gx : tnct ,*?

参考答案:    
标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as harhzga5- 55e9lr4wuzw n;vu. exd against a stationary brick wall, the amount of work you do4a5xzlnev 559egzw;u-u . rhw

参考答案:    
标记此题
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 vertit.os memm(ook 13 9c7ncally and is being held there. How much work is being dmo m1 skno(.octm37e9one in holding the box in this position?

参考答案:    
标记此题
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 a 10- z5wafj0g9k w4dss t6,N object, the amoug 9zwsks5fa jw6,td 40nt of work you do is

参考答案:    
标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is liftedmssc pc +t,x,) vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much workctp) ,c sx+,ms was done?

参考答案:    
标记此题
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 on e si:o yau,3h1the object?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 donekea q 3 3yl9l tbf.w*trpoo8d3-2dob ; by gravity while the ball goes up with the sign of thd*q2e-.ft3t3olo8low kb;d3y9 r a bpe work done by gravity while it goes down.

参考答案:    
标记此题
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 versy)(tdhg qc. f*us position (F vs. x) graph, representsy fct.h) gd(*q

参考答案:    
标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus positio 0((fdj)v ;vyw.cqpcun (F vs. x), what represents the work done by the force cy .ucpj( )wv(vf 0d;qF?

参考答案:    
标记此题
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

参考答案:    
标记此题
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 r,x+/ otxhfe0i4:jt+y pev1z,1 pltkis positive, then the object's kinetic energy

参考答案:    
标记此题
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done ondnd 0h soeg( 4ra+8 zrvzb91v3m(cmoa5f7ex- an object is negative, then the object's kinetic energy

参考答案:    
标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done one0o;: 2e,a6dxd/5qgyyx vd ga an object is zero, then the object's kinetic energy

参考答案:    
标记此题
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 speep ,,ee(ioxf;c8st5 k,krpmg-d of the car. Which statement is true about the truck's kine ,c xi fr,mksg-;te8p5( ekp,otic energy compared to that of the car?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 o xj2q c9ifc0/uf car K. The kinet/ uj29i0xfcqc ic energy of car J, compared to car K is

参考答案:    
标记此题
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 half7 a;(/kydo n )-cn-tcr0ov 4vmxqmr8w of its original speed. What is the ratio of the final kinetic energy8nv oq 0ov4-w mkx yt7mc;dn/rrc()-a to the initial kinetic energy?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at 4j.q uk mb fm9e:er jf0:ib p.sc65c/xj4 pj/na 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:p .kj /9m6./ecje i45x0fu4rjmscbpf b:q j n brick's mass to the rock's mass?

参考答案:    
标记此题
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 mov dp25o odil( bf2(9ndfing with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest 9dpdil5(fbd(2noo2 f. Which object travels the greater distance before stopping?

参考答案:    
标记此题
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 sj mx+uzqufp i(y 5z))7kid a certain distance on a straight, level road. If you had been traveling twice as fast, wy mqx7zi(jzu) 5+up) fhat distance would the car have skidded, under the same conditions?

参考答案:    
标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an elliptical orbit. N7 oq5c)r ifypc w.2m;weglecting any friction effects, wharo ;fc wim5)2 q7.cpywt happens to the planet's kinetic energy?

参考答案:    
标记此题
22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy p3i1 n dqh )h0gnfy mby7:gj7+hrinciple.
参考答案:    

标记此题
23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 nega)afc s;7k myr:2ui7 uztive potential energy?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest agf,cb.j96f )gc nll j4 height h above the ground. A second object with four times the mass of the first if released from the same height. l,jg ff) 4j.lcn69gbc The potential energy of the second object compared to the first is

参考答案:    
标记此题
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 ie 8 *2yexvg;xtt to stretch 5.0 cm. If another 0.2 x* vgyex;et8200-kg mass is added to the spring, the potential energy of the spring will be

参考答案:    
标记此题
28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy oi. wkz2f jn1ry*cr1b6 ii-b4k f a system

参考答案:    
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tt1kdgu41 k1b4,rspyl -o:ss vree. Compare its kinetic energy K, to its potential energy lss ,tp1rgovu1ky4k1:-s4bdU.

参考答案:    
标记此题
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a carcg+vkpj,egq( ci7 i 39 driving up a hill.

参考答案:    
标记此题
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding with equa0o5sdv8c op7e l,z v5rl speeds along a level frictionless surface. They both slide up the same fricti scz 08 oo7,v5dervlp5onless hill. Which rises to a greater height?

参考答案:    
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses j5r*d h;p5wpc6hu 8,kfswy t, $m_{1}$ 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?

参考答案:    
标记此题
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 for 2gsqi1 7sd;f-e hg t1nn2m k,hconservative forces.f1t qes- hmding,2 snh21 kg7;
参考答案:    

标记此题
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 (- qv10fs0 nhysair friction is present), to the ground below. How does the kinetic energy (K) just before striking th -sy 0qsn01hfve ground compare to the potential energy (U) at the top of the building?

参考答案:    
标记此题
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 kinetic// lohed:/ln k5mavhr vro:-5wv+( ek energy. Do not ignore air resistance. How much gravitational potenti/:m5o rn/le5h (kha -/owvr:lvk+evdal energy did the ball lose?

参考答案:    
标记此题
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 gravitationm9n(bw4f0ssh al potential energy. Do not ignore air resistance.s4h bwn(sf90 m How much kinetic energy did the ball gain?

参考答案:    
标记此题
37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of j15nz y/ 5qbffenergy.
参考答案:    

标记此题
38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t is;fl0h xpjowz f1z0xl)up 9c37

参考答案:    
标记此题
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressqrze-7q0dk t x*6-9e rld3tt ved in SI units?

参考答案:    
标记此题
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 0agbbgqlox52m. v8kxr al, 29?

参考答案:    
标记此题
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterdaywtms00 7fqbty-xm6 i+, you did 3 times the work in one-third the time. To do so, yout - 0 7fm0tm+bwi6yxsqr power output must have been

参考答案:    
标记此题
42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant+jo3 )nz w:3ne(sdzzl acceleration, the car's engine must

参考答案:    
标记此题
43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically:0o3b gvm8yu7bus t e;3n y77rwx pyx5 2.0 m and held there. If the object weighs 90 N, how much worknby 3wsextvruym y;:8 u577p7 og3b0x was done in lifting it?

参考答案:    
标记此题
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 const+c)wfi roc6; d gv 85u :jj0eq:r+zba sa*bk/vant velocity of 0.50 m/s. What is the work done by j :ja fkr *gz+vrdc5qu6vaobe:i;0/8wb+ )scthe weight of the book?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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;3:wb8a gwq 7hbw 9 /4-c4halnrmetri force of 5500 N for a distance of 50.0 m. What is the work da/t 4e43rcw: bmw hb lh ;a7r9qgwn8-ione by the 5500 N force?

参考答案:    
标记此题
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pua( ..cqs-z.ntgl hlywd t:b88( ijr/olled upward with a constant force of 5500 N for a distancej-a/i gytwzr..bn.co(lt 8d hs l(8q: of 50.0 m. What is the work done by the weight of the elevator?

参考答案:    
标记此题
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 conse;hs 2(p)7cl8 w ntmrotant force of 5500 N for a distance of 50.0 m. What is 2c n)8s(h7toprlm we ;the net work done on the elevator?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6. x2gub8 3/ uk:pk aaavhgvk.470 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

参考答案:    
标记此题
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, inclinf:j iewe.o d9su0;*v i( w/po+tvn)azed 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?

参考答案:    
标记此题
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 onv f9uja5y2)voqjma*8q1pra, an icy surface (assume no friction), with a force of 60.0 N at an a fuo*pa )8,9qyjmqv21 vaa5jrngle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

参考答案:    
标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object*rx5 +p()rno xrf zj;k in the direction of the force. The graph in Fig. 6-1 shows the force versus the ob*x;rrx+5 roj (npkf )zject's position. Find the work done when the object moves from 0 to 2.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
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.kbu(b7z 4fx6v:9uh- r-nhbzg The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 tv zf(ukhbxb hnz7-:ug9r-b 46 o 4.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object i r2 uom/xsfa-k(e++z3s4lg 9w9ufhz b n the direction of the force. The graph in Fig. 6-1 shows the force versus thhw/xl z soa4-f(2+z9uufrbe93sgk+m e object's position. Find the work done when the object moves from 4.0 to 6.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an obj5jdp t k9aw. nvzu))h+ect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when t5t nvw) za9)+d pukj.hhe object moves from 0 to 6.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
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 carls 0o/dqyu/k ,t (initially at rest) across a 10 m level surface. What is the final kinely0// ks,uodqtic energy of the cart?

参考答案:    
标记此题
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 (in6.6+kwpn r:q sfp8ayu itially at rest) across a 10 m level surface. What is the final sperkwu8q6 : 6sppf. ya+ned of the cart?

参考答案:    
标记此题
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 l yooq4bq)j, hf1 8z/pis required to st /,jboypo4qq )fzl8h1op the mass?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to st(h5h4a+h*ri6nflnq v0 18cc/fhx ga,qq w kb9op a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditi qncgqwafhxh9+(0 v*r h54l c1hqf6an, 8k /bion?

参考答案:    
标记此题
59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 1.)j:tg viqwxt1pg:e 8b v q8f10-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 g1. q8igfg:pvtb ex8 wq)1:j vtun, assuming the spring has negligible mass?

参考答案:    
标记此题
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 componexf e9;yqjx jtz 29;fa.d2yy3xnt 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 alyxf;2x j qxtz2ya; fj99ye. d3ong the floor. What is the cart's final kinetic energy?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 hayxf /52(bovluj , striking the hay with a velocity of 60 m/s. It penetrates a d bo52/(uljfxvepth of 20 cm before stopping. What is the average stopping force acting on the arrow?

参考答案:    
标记此题
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 x jcrt)s b4g: ./vl/dna height of 7.00 m above a floor to a height of 13.0 m x .r4jcb ):/dvt n/sglabove the floor. What is the change in gravitational potential energy?

参考答案:    
标记此题
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 planerkf* l,z)8,,oy8s q-jsfr xl4lxee m + is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the 8 ll,ok*sf-xer) qxs 8+,e4ym,fz lrjpush?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 222wsgdjj-a z9.0 cm. What is the spring dwa s922- gjzjconstant?

参考答案:    
标记此题
65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized pajn:u s)bfl c:17 avs2v,l ,bby a spring constant of 60 N/m. How much potential energy does ita,s:u2bns7 1 vfvl:,p )bjalc store, when stretched by 1.0 cm?

参考答案:    
标记此题
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to )-v f, 1mvpzvucompress an initially uncompressed spring with a spring constant of 25 N/mz-mv)1v , ufpv by 10 cm.

参考答案:    
标记此题
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is require*kkzwji ej/l f4iksu9frkoxc705 06 :d to stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positionk0jf7 koek xj9u5rfc zs4: /6w *li0ki is at x = 0.)

参考答案:    
标记此题
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 rgh, f i8jb atn6x3k99):wcf vis initially compressed by 3.0 cm. How much work is required to compress the spring an additio tgw j a9fxib)c93v:6fn r,kh8nal 4.0 cm?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 high slope. What ivt cpobh14-ct,p zp+ )s the speed of the slier on rcp-o +p)vptt 41bz c,heaching the bottom of the slope? (Neglect friction.)

参考答案:    
标记此题
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 initial speed of 4.2txauup 7/b5 j6wzkc00 m/s. Neglecti pckx tb5u7j062wz/aung friction, how fast will she be moving after dropping 10 m in elevation?

参考答案:    
标记此题
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 j xbi+frg, 4r5 au3p6d 6bhzc-the bottom, it has a speed of 9.80 m/s. What is the vertical height + fh-66j34 cg,rbixar5d upbz of the plane?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 0.70o-in49 fx3(rtq xt9zq m above the floor, its potential energy exactly equals its kinet9t( qqf39x-zno r x4itic energy. How fast is it moving?

参考答案:    
标记此题
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 upf ((23naglyo u)3panu from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total l ng3u)pu ((n o2faa3ymechanical energy is 140 J. To what vertical height does it rise?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 ener8tg6,ddhugj *)f6 +v0bd dufwgy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what verwduddtgf 06 uv *+h,b8fg)d 6jtical height, relative to its launch point, did it rise?

参考答案:    
标记此题
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 4 g:90qxipr n*f5 m above the bottom of a dip (See Fig. 6-2). Neglect frictiogi:9r n0*x pfqn, 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?


本题所包含的其它图片:

参考答案:    
标记此题
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 mlt6lpw(o mb q h 3ap3unp+3j;3 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 the next slope, which is 30 m above the bottom of the dipq63p3pt; n(3l l+3ahwumb jop?


本题所包含的其它图片:

参考答案:    
标记此题
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 el6ar;a/n-np/i u v3td +vse.of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be tt/6u;a-sn +l /v3p ine.ed rvahe speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


本题所包含的其它图片:

参考答案:    
标记此题
78#
 
  What is the minimum speed of the ball at the bottom of igl3/5yver9q1w uttvr yn59 2k ts swing (point

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

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
80#
 
  难度:2

参考答案:    
标记此题
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 o4mds 4*ci/, i jdfb7mreleased from rest. What will b,s*i/ im mdf47j4cb doe its speed at the bottom of its swing?

参考答案:    
标记此题
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 hito)3ck oobm45:lmzoh)b7vyi, ky 8p04z *nf bys an initially uncompressed horizontal spring with spring,):*oo3)f07yoh bkpczkz m8by y4 vin5 4mlbo constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

参考答案:    
标记此题
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 d:kdg1t,g- ce ((xwi+ oqmsoe/own her 2000 kg car to stop for a red light. What work is done by the friction force against the w-otick x/:gmdqo s1+ we(,ge( heels?

参考答案:    
标记此题
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-kgw8c+rz4 qqr sbef*f6; object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide+rf8 4cf6qebwqr *;sz before coming to a stop?

参考答案:    
标记此题
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 bs c2g31j yzlr2ej. :rhas 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far j:sl22r z.3c jyg bre1will it slide?

参考答案:    
标记此题
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 e*e-8l agy;iwl3eb a5level surface. The coefficient of kinetic friction betwl * 53l;abey8e-awg eieen 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?

参考答案:    
标记此题
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 slopetjkaf e,2u+qgo,w 4ujw2ol90 . If the work donqa2juw, g, e2ultwj4o09+ kfoe by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

参考答案:    
标记此题
88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushe)orf:sm 6x7 +w kh34ogtkx6mq d up an inclined 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 7w6 sorqtx6o h+xmkgmf 3:k 4)of the average friction force on the box?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 top of a plane inclorxy0zv uqe4t m*f4)4mjk41 kined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along t)f kukz*term4 4 oq04jmv4xy1he plane?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground with zu 6 snro7*6s :p4vd2balt1imcl l v,9a velocity of 7.00 m/s. What average force of air friction acts on it as it fallsvr*42lopbz 1it:6anc 9dv sl,6lusm7?

参考答案:    
标记此题
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 a flight of stairs 1udff jz-(wu1xxr7ed q o:qlz4g +2:3 n0.0-m high, q1: :gf wrdne -l+qu(fd2u oxzz7j3x4 in
8.00 s?

参考答案:    
标记此题
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 objl ;x:ey)d. fpqect with a constant velocity of 5.0 m/s. What power must be deliv. qyde;l xp):fered to the object by the force?

参考答案:    
标记此题
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 (k:h0 pp8* n2hdpwf vha 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)hhk(: v*hwdpp 2pn08f

参考答案:    
标记此题
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 msc/wxti ;-*/jwa qwl8p cdk pwzv601 )uch force does her 0jq1wl pxds- )8a;z ww wp/6icvtc* /kfoot push with when she is traveling at 8.0 m/s?

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
标记此题
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 ,j 72crpcjbmj6x i 05z25 m/s in 7.0 s. What is the average power delivered by the enxjm 2i5z6r0pc 7jb j,cgine? (1 hp = 746 W)

参考答案:    
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skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
  • 姓名:游客(未登录)
    •
    总分:95分 及格:57分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题，此次习题练习共有 95 道题
    本平台(https://51fly.win/)支持练习，作业与考试(自动评分)三种模式，群组成绩统计排序导出，题目动态变量实现同卷千人千题。
    如果您对本系统感兴趣，想加入我们或者想进行任何形式的合作，请加微信 skysky1258

    试卷内容到此结束!   © 2026 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|手机版视频|手机版试卷|使用帮助|51fly国际课程 (https://51fly.win)

    GMT+8, 2026-3-22 11:11 , Processed in 0.667198 second(s), 219 queries , Redis On.