题库网 (tiku.one)

 找回密码
 立即注册

 

      

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
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test60.html
 作者: admin  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

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 unififg5aff *m1 0t of work expressed in 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 motfq nlqt,b12k 7ion?

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 hard against a stationarjr3sqtk g:ai( v.,z5zy brick wall, the amount of work you(gv jqt 5zksir, :3.za do

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 vertically anow +yr ih,g/l,thy:ls1h sn/1d is being held there. How much work is being done in holding the1ly wrgioh/ns1h:sty/l,+, h 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 forcqfz b,xl(d6lnu363 mp ij6v; ward at a constant velocity carrying a 10-N object, the am 3l6 qxijlu; nd,zbfvp3 (c6m6ount 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 lif y5ckz7w+ br9yted vertically 3.0 m then returned to its original position. yw7yb rzc k95+ If the total weight is 30 N, how much work 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 the objectggd 8319ipidbm c 3j+j +0hcls?

参考答案:    
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 them ,pb 0 +tseh (m cw;mu5v)ik06bvzro9 sign of the work done by gravity while the ball goes upspw 05b+ 9mr)evtho c(i6mkv ;mb0u,z with the sign of the 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 versus position (F vs. x) graph, represehm48 hrww*uawzn3: vo 9x:r(8xl8gy bntsy 4 83x rawhur8 w wlbnhzmv8o9g::x*(

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 vers1u 5i gbakyh qc yki7z21:6a;+ayynj 4us position (F vs. x), what represents the work done by ta ua+ay5n2 cz7j kbyi41qyyk:i1h;g 6 he force F?

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 is positjn1u8k31u5mbza u7df3 u+ q6vbwop (mive, 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 on an object is negative, then thdl(kjn 7 5nr lpx8qc2ta;o.-.bws 2rzcs,z j+e 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 on an object is zero, then the objectxuzx br pd1d5i.*f) 3z'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 mc 2io+afi k/nd3yc6zn ux (q)o5+(f izoving at twice the speed of the car. Which statement is tr3i( /) zx+5d(y2nfzikqn uo6ca+ icofue about the truck's kinetic energy compared to that of the car?

参考答案:    
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 Kbsl(vz1ummz,c os3b,6 /x bh7, and car J has half the mass of car K. The kinetic energy of car J, cvo(l 7/,smh63z, mcub bsx1bz ompared 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 half of its original spep75tja 2do kxi ngy/;;ed. What is the ratio of the final kine;75i2xj;t/ndgko p ay tic energy to the initial kinetic energy?

参考答案:    
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 a speed /; qlwe*4vn ro8wtq(j 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's mass t wn/lt ;oqj48(q*erw vo 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 moving with spe v/jj6lf(br k)jwo75l ed 4.0 m/s. Both objects encounter the same constant b ko57(j6 j)wlbjvr/ flraking force, and are brought to rest. 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 skid a certain distgtvo1 :m,tzso b3ke9(3 rc.jrance on a straight, level road. If you had been traveling twice as fast, what distance would the car have stb3k3,. rzs 9et :om rc1g(ovjkidded, 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 tzjv0)dr +4n;imj. qskff +oy 4he Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy?j 0ny+i4 fsf+vd ;mojr).qk4z

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 principti9y+m.w oy+ w3he y b*x3v-rzle.
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:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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:    
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 negatd .ap,:mhlhi)l, vm-6oqwdl9 5r rx7: 0ydvhpive potential energy?

参考答案:    
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 a height h above the grol:m,3)upkdr m und. A second object with four times the mass of the fi du3,lmm)rpk:rst if released from the same height. 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 enix-d5o6y0gly p2 i6rj 4eeh8 td of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sr e6-p4x0hjy2ey5itgdol 86ipring, the potential energy of the spring will be

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 of at 892o 2rwuxgy 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 tree. Compare its kineti(-*4nvqj. -na x,m o3nyhq nczc energy K, to its potential energy jcy(,a mn z 3-nxq*v4.nohq -nU.

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 car driving ci.tp+2b6h27 e mu2rpb( k5: w sqnr:jh1bcurup 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 so7 mk yf5g4mp6eq1svplj37+2- w n xupliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a sqp1 pwgfu+65m73kmey274 -xpjov ln 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 my3ou+-dkh q8$m_{1}$ 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 conservativec1 , bqg/osi,lk:w8ua forces.gsq 1:,ok w/c8,lia ub
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 (air f0 tnk6q,,9,j7b qmzw.m . tbur+:tzvnf -lkxiriction is present), to the ground below. How does thet0 .rb7itw+n bfl6kq.-vuz ,zmtj, ,qmx:k9 n kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 gains3g 3tkmnvmsm3 r+e-z8 30 J of kinetic energy. Do not ignore air resistancrtsk3m-3v3mmne 8z+g e. How much gravitational potential 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 gravitational potvmyaan,;44a f ential energy. Do not ignore air resistance. How much kinetic energy did4;,ma4yn aavf 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 conservatiotl(kbtdy1 z6wj+ lv ee (a2qh:f (+vc5n of energy.
参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 2p )(a znl2akpocle2-

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 pow,v vjr01ev9/ xe+k.y j3fgv/ug4qif ker expressed in SI units?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 uni8a oph- xro*e1h8a bt(x9kp)xt of power?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
标记此题
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 the time. To doks2r. -yi0 25m mfas.-h kraes so, your powe y .s-5 h.fkkammr2ei2rs0as-r 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 constbgkj 7lf r(rd9k71pi7ant 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 2.0 m and heldlda tk8 25bsb4 there. If the object weighs 90 N, how much work was done in li4a825tdbl kb sfting 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 m33m :m)mpe4-gs xbftf*q8f r in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight:f 3b4 mqep-mf s g8)mtf*xr3m of the book?

参考答案:    
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 constaxh1m(ng o/ cv15 .cmncnt force of 5500 N for a distance om5g11/mvhnc. ox n(c cf 50.0 m. What is the work done 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 pulled upward with a constant force of 5500 2pt1vby. e mi.N for a distance of 50.0 m. Whatm i.e2.py v1tb 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 constant fzuok (; )1dtuy)b,vr:vupg4eb3m sx*orce of 5500 N for a distance of 50.0 m. What is the net work donexg3,u4bbz m :kodu vr ))euysp(; v1t* on the elevator?

参考答案:    
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 6.0 m up along ann7 :wws2d i-g $37^{\circ}$ 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, inclin50 pjd2a(a2fzlul5 hp5k j2 efevq5m2ed 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:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 on an icy surface (assume no).s8pkq2 cb g5 g6odqi friction), with a force of 60.06bpgk gc o .2i8)dqsq5 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?

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 in the direction of theme +awxdgm uy(a52,,q force. The graph in Fig. 6-1 sh dmg,(w,ea5uq+2 may xows the force versus the object'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 directiomne3e ze n,, oz7ff(:qn of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done whezemf qe:no efz,3 7,n(n the object moves from 2.0 to 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 in the dir4eqn2q/ +lh:s/;x ezxj1ibd p ection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find thej lq/bi2:x qd+sx/eeh;4z1n p 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 object in the direction of the force. Tht sc13horz:gvv+) ;e se graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object m oh e+t)rsvg3s;1 zvc:oves from 0 to 6.0 m.


本题所包含的其它图片:

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 cart (initiallyot21rgh6w*o wf*utp qq.8h x) at rest) across a 10rhuqwo2g*o qttp1*.)w hfx68 m level surface. What is the final kinetic 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 ca .2br4.i v9crhhka54 dnnlz.vrt (initially at rest) across a 10 m level sur 9l2b5hviv4k zd.cn4rh.a.rn face. What is the final speed 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 witbh:v/-aovl2 e6wsf-(i rg +kqh a speed of 5.0 m/s. How much work is required to stop the mas g/ws+e:viv -r2kf-a (b 6loqhs?

参考答案:    
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 sto fa 9btwp;1qq/wy/p. uas0o5tp a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the yqow/swqt 9 t b/a5uf0pp;1 .asame condition?

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 10-g dart. It is cockekw8l 0,1rc vwyd by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart lecyk,018r vw wlave the gun, 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 co 7rcz, fs-htx:mponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart startxf-,hzs: r7cts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

参考答案:    
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 balhxz+m-u0x p,f,a /h ks4zcdg(e of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the averaahhfx x4dc z,/ +,0zp(s k-gmuge stopping force acting on the arrow?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 a height of 7.00 m above a floor to a kg h4zrt-f064 rgd/vh7l nx 2gheight of 13.0 m above the floor. What is the change in gravita gkg2xr 4tg7nhh r/f0 4zdlv-6tional 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-rerc++(a8e6umb* s;-*xw cq l gjouc up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane seurl* oxqc-jb(w;em-u g* r+6c+8 ac is frictionless, how much work was done by the push?

参考答案:    
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, caukdjs vmwp ,o,1 f5--4-yb, 3 lcpfn z2ww4tzhnses the spring to stretch 2.0 cm. What is the spring constanfp4f,jz-c1-,h 4n3dm swv tw o, zn2b- lpw5ykt?

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 by a spring constan5k+upe-w+u tk 2n pfd.p/05a2)nby -mm hgp rvt of 60 N/m. How much potential energy does it store, when0 5+pu.-mnep5w)fd2kykrub a+hvm gn/t2p-p 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 9.2jev d;thdyto compress an initially uncompressed spring with a spring cothedv . d29jy;nstant of 25 N/m 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 required to stretch a spring of spring constant 40 N/m from x = 0.4wzfen,-ppo -20 m to 0.25 m? (Assume the unstretched positione-pn p4w fo,z- 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 is initially; g/gz,yg hoqv ik85:i compressed by 3.0 cm. How muczy /, oi;ihgv gqgk85:h work is required to compress the spring an additional 4.0 cm?

参考答案:    
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 sjxxbc 1tf,.ku (wv71high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect friction.).ucx jv17,bfx tw1s (k

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,3xkfbmh9ls-kf+) l 1f pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting fh-1xkbl s9f )mkl3f+f riction, how fast will she be moving after dropping 10 m in elevation?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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 fr- 5f6f /5qtobu44ht r0qkx efjictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of to /hrekx- qq04bftj6ff5ut45 he plane?

参考答案:    
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 0.70 m abola,aryth 21r --osayu- (*zdc7 gz8suve the floor, its potential energy exactly equals its kinetic energy. Howyur1-sy2* -cgz al r(h7 -s a,8tudzoa 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, b 0 -es7ahij*cw/ ,; wz)vslrtplasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectwc)p * zh tr,-as/l7iej v;ws0ory, its total mechanical energy is 140 J. To what vertical height does it rise?

参考答案:    
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 o opcuj5f5vzg :5y)+t m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic en5oucz fj ot5 +5ypg:)vergy is 120 J. To what vertical 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 pointqg*ibdv.ws5 + 45 m above the bottom of a dip (See Fig. 6-2). Neglect fricti*.b5s+gw d vqion, 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/o /v0+cnnuzo at a point 45 m above the bottom of a dip (Sez//ouv n 0cno+e 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 dip?


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 mq,, k+/fcj2nchgny1o5k y)s )v ;jlme:9ulpz above the 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 coaster at the top of the next slope, which is 45 m ahsg/n yljc1k ec)5 p)qvjk9z:f,l u ym;2n+ ,obove 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 its swing (pointlja 6b2 w1;i7k.h uo)k beak9i

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:    
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 vedo7bgh.djq, : rtical axis and released from rest. Whog.:7j q,d dbhat will be 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 hits an initmdegja0sq4x;m,uh0s8c/ o )tially uncompressed horizontal spring with spr0 )estghds;m u4j/0 ,ox8ac qming 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 down her 2000 kg car to stop for a red r hp+-ekx rh+o(vq96dlight. What work is done by the q-9dor kh6(x+r+vpehfriction force against the wheels?

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-kg object and a horizontal surface i w;5n utecb3j7s 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stnue7;5cbtj w3 op?

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. Itdn t, -kii9pxlcxroo 1./.uz/ has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. lod- ,9 u./ x.i/c x1opztirkn How far will 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 opxr d 3zq 5sl0p9ua:0zn a level surface. The coefficient of kil sp9d 3qupz:50a0 zrxnetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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 hign2m3)z8m8irq*v xn gg h slope. If the work d )8g i*nvn2x8rmg3qzmone 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 pushed up an inclined plane. The planeitc)j x l7-z/q is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the t )7/jzctiq-xl op of the plane. What was the magnitude of the average friction force on the box?

参考答案:    
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 akgvo o.l7 ce9 pvc-l( *31oyyhgjm1g 4 plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speek llc*h1 31- mo(y.jy ovvc 47ggog9epd of the mass after sliding 4.0 m along the plane?

参考答案:    
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 hlb s:3mfr)qh7ia5xu3oi b;8,od k; sgeight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictio ,o)ub a;3f3gdrh:b kmio xs57;lis8qn acts on it as it falls?

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 ennpf43q 5qz9aw -(apev0d 7o6ngc4vlh ergy when he runs up a flight of stairs 10.0-m higqa elnp f4h3p 4 -zov 50v7ca6d(qgwn9h, 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( of vvcgsm),wg +dx(, move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the (f+vo cmgw d)g v(xs,,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 a 1.0 hp motor that runs for 1.0 hr? (1 hpyzwl-s- 9:8r0awgvonurns y8 1a /y7eg7g h)g = 746 Wn/ 9g-sya0 7w :ouynylrze 7vgwrg)8h8 g 1as-)

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 500cgx rzsx7o:/a 6s7yoco4x 8w/ W while riding. How much force does her foot push with when she is travelinsr/o7 y68zo :x cxw/o4s gxc7ag at 8.0 m/s?

参考答案:    
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 25 m/s incdick h,o 9*mo0szk 12 7.0 s. What is the average power delivered by the engine?iodz 9k *0,mhs12occk (1 hp = 746 W)

参考答案:    
  • :
    •
    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
    本系统支持习题练习，作业与考试三大模式，作业考试自动评分，成绩排序一键导出，可设定动态变量同一试卷千人千题
    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!   © 2024 题库网 (https://tiku.one)版权所有

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2024-11-23 22:04 , Processed in 0.491203 second(s), 211 queries , Redis On.