Physics Unit6: Work and Energy - 题库网 (tiku.one)

1#

What is the correct unit of work expressed ing3rn5 z6 4aozp SI units?

A. $kg m/s^2$

B. $kg m^{2}/s$

C. $kg m^{2}/s^2$

D. $kg^2 m/s^2$

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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 there is no motirr9a.8 n-t jhwon?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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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 n 4 no7e e5uf/e rywzbrrb i-:8qm;*:nwall, the amount of work you -n7r54 b euo;erf mnwz:yri*8b :q/ endo

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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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. How muj (ucgq+1s2jhw d3st8ch work is being done in holding the box in this posis8+ sq ju(h2djw1t3cgtion?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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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 cai wjqt -h86fv-s(i7r srrying a 10-N object, the amount 86i7q-i vw sfs(h jrt-of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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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 re1kx9 cmfk/ q0uturned to its original position. If0muk qx9k c1/f the total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on w9m 9z a zxi/1hzp(* gj/0xjx;yqw/k lthe object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravit-h z5 ytuf:banm(*dm q;+njq +y while the ball goes up with the sign of the work done by gravity whn -nbt(5mu :jyhf++* mzqdq;aile it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way 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 positip7o 4 ky*yxoh.on (F vs. x) graph, represents*7yh .4kyopox

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. n 4(;nugxnk;+ial. q oba2 wm)x), what represents the work done by the m.lnan bnu+; (a2) k;w qox4giforce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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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

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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, t;2 +unky4 c3jizebxp :hen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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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 th7rf sw1(zkfu/e object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic energyqk- vqm0o6zao . ;- 5zzyz*fjg

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed of the c69em;j)v ssgnt *k7jlg(pu go 4l)a9uar. 9k easvsg4t7m *9l )6glu(j;) opnug jWhich statement is true about the truck's kinetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy 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, )pub3 giqq; b),jfge4 and car J has half the mass of car K. The kinetic energy of car J, cgqf3uqi; )egb 4p,)b jompared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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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 sp cuyvj)is q;5p)kl61l eed. What is the ratio of the final kinetic energy to the6j1lkqup5 v;c)is)y l initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is m)3 ef/ouiac/ boving at a speed of 5 m/s. If both objects have tha/f e/c)3ubio e same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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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,n;vlve8d( ayb 8 0blja cnb;9q, :hgk mass is moving with speed 4.0 m/s. Both objects encounter the same constant brakinq ced :;8 kngbylbva8vn;ajb(9l,0,hg force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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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 a certain pi m 3kmjlqj,8a7fv:8n ta3c3 distance on a straight, level road. If you had 8anklp8i: tf 37j3vjamqm c,3 been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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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 ovzt o tbm h 3dd9.ui57fhl,0t+7dwdb6 rbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kineticb zbdv7 ufm0,+3d7l56idtht d.9o htw energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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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 priwh/9 ie nwg1-bnciple.

该题自我估分: (必填) (满分:1.0分)

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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

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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 hav;a/:.szt v jhse negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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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 ggq(jmz g3 x;8xround. A second object with four times the mass of the first if released from the same height. The potential energy; 8xq(zj mg3gx of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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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 of a spring causes it to stretch 5.0 cm.gmif3dr l7n4 4 If anoth4m3i g7rnd lf4er 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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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 systeb9tzd )4t 6k6 by.*h0 win+gn, zxepqem

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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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 energk 0rr0hwd2 nww+v)bq4y K, to its potential ener4r 0+)hq02vd wwnrw kbgy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy ofn+2 (sc0lwleo4c4qf e a car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and6 aw8j1 hxqsg3 a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. g8sahw61xq3 j Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses e lwx 6vy9,n0q$m_{1}$ 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?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservat;7f.cc; offk aive forces. f.fco7cak;f;

该题自我估分: (必填) (满分:1.0分)

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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* au..dku w7ao of a building, through the air (air friction is present), to the ground b waka u..*7duoelow. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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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 kinetic energy.ab:2ke-) brwu:tn/6l ut9u vw gss;4g Do not ignore air resistance. How much gravitational potential energy d)rlg;w /b s4:s6abgttek nvuu92:uw-id the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational po+vh(ycz:tk j,tential energy. Do not ignore air resistance. How much kinetic energy div,:tzc j(h+ky d the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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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 energp 2bvop jlcjc1.94 fn1y.

该题自我估分: (必填) (满分:1.0分)

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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*lfu9- h: 8mymh,etiz

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unit 9ci )/muiy)vns?

A. $kg m/s^2$

B. $kg m^{2}/s^2$

C. $kg m^{2}/s^3$

D. $kg^2 m/s^2$

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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.).f v uh/. )rfoalr36,tjo;jzitamw?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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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- jd6xk xeo,8pe hxx74-third the time. To do so, yodejo xk4x6 8p -x7xe,hur power output must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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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, aa2xhp-c ini;2j57pi the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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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 verticnr3 kqvwnf212ally 2.0 m and held there. If the object weighs 90 N, how muc3nr 1nfkwq 22vh work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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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 *a(4p x),vep sshepf, m, at a constant velocity of 0.50 m/s. What is the work done by tpe eh (p) *s,fxvpa4s,he weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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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 constant force of 5500 N for a dio6b4bey66 sdhq49ov kstance of 50e4yo69 6hb sk6qvdo b4.0 m. What is the work done by the 5500 N force?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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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 upward with a constanz+yzzjho;o ,sclc49 f /dz(oh8 e o+ asiw/56nt force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the ele9l hywe(z hfdc/z4,z soo6/j o8z5 +csi+a;no vator?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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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 forp4fbp) ; +9kg+vvt smf a distance of 50.0 4g9mk )vp b;f stpf++vm. What is the net work done on the elevator?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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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 pulleda 909s -gdkfcy 6.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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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, inclined a0+z y)lj. eyiyt $30^{\circ}$ 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?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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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 simyb50z)doz* kster Sarah in a sled on an icy surface (assume no friction), w)do 0zkbz*5 ymith a 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?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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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 directiov48 qsu t:9c9dwnau+l n of the force. The graph in Fig. 6-1 shows the force versus the object's positit9cw+s 9luda 8qv 4:nuon. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 diren98* iphdjc(vt sb4d+ ction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0pdhctsd+ (9*jn i8 bv4 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 th8c ngyeonio6 6 vn+lixn83xc(*(db)l e direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object m38+ xn6vig *l)yo(nnd cib 6n cl8e(xooves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 in Fit6 cdw-7, rgwng. 6-1 shows the force versus the object's position. Find the work done whe dc gnw,6r7t-wn the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 applif(u kmx-e 2dkm;0e5b;ygt8cded to move a 55-kg cart (initially at rest) across a 10 m level sur(ek 8d-m2k5gudx ;ey;m tfb0cface. What is the final kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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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- 7poefa6*e j 2 ufjkf/odvm 485dmrq- N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface.pffeue6jd* rq5v mk7 -/o42f jda o-8m What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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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 .-wv 5r hty6fza speed of 5.0 m/s. How much work is required to stop th5 z6 whvr.y-fte mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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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 stoo+ w)hz j yk9tktrk002zxy c18p a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under thetjk9ywk+ o1yr2txz0c 0) 8khz same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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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 propels a 10-g dart.5ei 6 wox0w1se 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, assum 5wiee06 o1xwsing the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component of 60 vcu ,m+z 7hya7. ed*ior*o2btN. 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 along the floor. What +*eo.u7h toyvzmcbi2d ar *,7is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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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 d:l k5 (tgwiwbw+:l5k g is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is ti+wdk:l 5k:wg wtl b(5he average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00/.o3wd azalu4nrn:va ld1r 65 m above a floor to a height of 13.0 m above the floor l5a 6 lwdar1u/ no4.v3dzr:an. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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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 4.0ml w9;lqts:jy)7;xk 1 xa-s wb m long and rises 2.0 m. If thxm)l wa;;-s wb1kqj7yl sx:t9 e plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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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 sa84ru s(r /sxttretch 2.0 cm. What is the 4sr/8(ras xtuspring constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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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 constan0bmwh+(3lp2 y wptca)l+b nd. t of 60 N/m. How much potential energy does it store,3 p0am b+wll+.t 2c)ypnhdw (b when stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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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 compra ywnhm5:la13 ess an initially uncompressed spring with a spring constant of 25 N/m by 10 cm1lnm3 a 5:ahwy.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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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 fiwrg 7rtc/9 csx-6c/stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x f w6ccritc-/s7grx 9/= 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is ini*-2.sfmo*qy ,doxce atially compressed by 3.0 cm. How much work is required to cxoy-sofc,.qd**e a m 2ompress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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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 s1dg/4s0 kskj top of a 50-m high slope. What is the speed of the slier on re sdkkj/s 1sg04aching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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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, to)2w2qb nr v)ou p/ns:h t./kvojw+(pushes off the top of a hill with an initial speed of 4.0 m/s2.qnp :(k/wt/js+vwh2o o ot)vur) bn. Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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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.aerel*mv x8 m5 gi24 lu 8ziriwva0h64pq4u-) At the bottom, it has a speed of 9.80 m/s. What is the vertical hxm v *mhiwi4u8)l2a-54ral4 uezirqev g068peight of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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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 thb zgwnc8(t5d ,rzk:e)e floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it move8 z(d t n,zc)grw5k:bing?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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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 gavau h, sf02m-round level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. Toa a2-su,fh 0mv what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a )xi9ki hxf f6s,lj9 d1kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy ik9jf 1lh6d9ixsif x ),s 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster startse6z1zt kfhu* pyscs4h1)3. h j from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which fs3z4 )hc zs jh 6*h1ekt1uy.pis 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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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 p)gg 4:y3ui(zl yjnv-v oint 45 m 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 thz3yji(vg v:g4nl ) -uye bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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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 bottf/ res, /yo4sxom 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 above the bottom oy,rxf ss/4 /eof the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at g:3 94uc s)asv8k9 ipz1psnvythe bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

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 ynip/) -e kdljj -g:8ucm away from the vertical axis and released from rest. What) /yn8k- ljdue jgp-i: will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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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 atep,nxdcqk /l :s *ja** 25 m/s hits an initially uncompressed horizontal spring with ,q*ekdsj*/xa n*lc :p spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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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 dwm3n o/9t c5+c;tv 9swtzr(i-dz+ret.m u2 qcar to stop for a red light. What work is done by the fri v z qm/ nruw2d ;+3tde5 +t-wcm(9zoc9r.ittsction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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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 object and a horizonta w2,hqh ubnt;fh1x7a; /+miue l surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming th;n1if2hmeh /a 7ubx u;q,w+t o a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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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 rougf8: 9xhej9qb0 ,td zf6 hx1bwfh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wi9bjx w6 hq:0 btffh1xe9,8dfzll it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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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 level surface. +)cyhaypb j xs2k24h2sr7b: h The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a diy 4ahs cjyp +: brhk72h2bs2x)stance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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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 restwgi6 emo65a.kxm q8p od0v /0j from the top of a 50-m high slope. If the work do00jgoioqe5x /. avd6mw8mpk 6ne by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and ris6zm7 gl v7x4i d)g/dkwes 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the mag)6w vi d7lmkz4gd7/xgnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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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 rest at the top of a sd 9pmw.jg e3c*)q) o va k.f5gor1bnm6fp;3nplane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass ansnqab c5* ;wvd. )o 3ef fmkpnprm6319oj. )ggd the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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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 height of 10.0 m, and strikes s3)/ f .dwsmewthe ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it faedw. s3/fmw)s lls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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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 when0 3jaun+ jhu.b he runs up a flight of stairs 10.0-m high0ua jb.jnh3u +, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocit (vu6+c.dgzv:qqmkv otgx;dk e u;/ 8re9x-:ay of 5.0 m/s. What power must be delivered to the object by the force?g dgukkq+;x; a e(-mz:cvrex/d9 8:6u.vvtoq

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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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 v,-mhtpa.vb kk,o3- xhp motor that runs for 1.0 hr? (1 hp = 746 W).v o kpxbam,h-3,vk-t

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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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. Howp*com:z3qe(jq* ; tio 6ewlo) much force does her foot push with w z6i o;o**ec3(twj:ml) poq qehen she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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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 2 e;xt,. stt(rb 48)kasuolvz85 m/s in 7.0 s. What is the average power delivered byt. tb4ko8 ;s a)s ,eultr8vzx( the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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