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

1#

What is the correct unit of work expressed b2xim. o h;2vttrxv/ +in 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 systemraaw m+ g0 *9ac0tp/sov9fff7o* ti +h if there is no motion?

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 wall, the amofqsbp;b 9rrb u * t4:d f4,m 5xb(9wsqy7a7djxunt of work yoxm :, ;qpfbrqr4 xdat*b9f d75uy jw9s4(sb 7bu do

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.h wtveqi*7fp /1;h r;:f;acxx How much work is being done in holding the box in this positio7aff; r h ;tivh:e pxx*cq/1;wn?

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 hozno5.+y, nwczrizontally forward at a constant velocity carrying a 10-N object, the amount ofn, .ywzonc +5z 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 returned to its origina l6f ep4o ;fw4myj-z8mh0cg7r l position. If the totaf;ro 464e gp8lc -7jwyf0mmzhl 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 actingcd)7vu6h :3yot 2rvns2 )xzok*m5j hq on an object do work on the 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 thea ;ep58v 68zslpigh x/ sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes dowz/apxiv 5l8 shpg;e86n.

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 i c9 iv vkk:8s:cq*ufmq: v/:pversus position (F vs. x) graph, represents: fqk cq/kv u :*8p:im:9vsvci

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. x), what represenqh i baa edujvc:/s1*. +q8rf/ts the work done by the bq i*:v/r.1s8 uh+fdaj eqc/ aforce 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, ts5.z:liewfrdnxs- pg; 8-zh8hen 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 neg*37 gthk okey7d syb;d /9wp+3ic0bs yative, then the 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 objz7u wani104 zroyee:+ect is zero, then the object's kinetic energy

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 mo(0iukd g-i6jw ving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to -0 (6 kjgwduiithat 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+h5ammivxk a9hn9 (p04-kn1p gx0naa fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to - pmh1+hia45a9a0n9m n(nxkgaxvk p 0car 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 speed. Wbp5hh/ o0 .p;dw; f)ra (cdycahat is the ratio of the final kinetic ene(r .;hdp/oacfp)bdc;hay5 0 wrgy to the 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 pebbl0wdg ,3r u1ympe is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is thed,ypwm 0 1gr3u 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. vux7vl/9mm w ck(q 9/m A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the wvc9 79uqxk /(vmm/lm same constant braking 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 distance w9k2ief1d0t 8ex vvb9on a straight, level road. If you had been traveling twice as fast, what distance w1we90df2 tvv9 ik8xebould 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 orbits the Sun in an elliptical -*du4 ysbw;40f ;n2 exsceuaoorbit. Neglecting any friction effects, what happens to the planet's kinetic ene ua02 4swxuf4bn*s;c-eo; edyrgy?

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 principlfibac* tigxl h-l 974*l8+itoe.

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 have nbfg yfff c-3xk,/( p,uegative 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 fr y98 oqgxv:usqmfijf9 + ;w8bw /e73qaom rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object fyo ;vqqemi+f9 sxbw 88 :7w/ag9 u3qjcompared 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 0vk duu*3-ueq to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring wiu3*uvq -ke 0dull 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 en kqqs9tr91z1 kr-z+ra ergy of a system

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 energyt(m4uq 9t0dz d K, to its potential energy U uqdtm(9zt4d0 .

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 of a c w/g ix(jl wf8eh;ja6)ar 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 objectqy3x+(c+)ufd mq na k(u-ayd+ and a very heavy object are sliding with equal speeds along a leved+ku+fc dm3a)nyx a+ ((q-yqul frictionless surface. They both slide up the same frictionless hill. 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 h *ao7nc;lvfg g(k +j 3b4nzt9$m_{1}$ 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 ener,.upk 0wn:vahpugef,j2vm8-tgy w)3 gy for conservative forces.hfywawkm-nv j3 puup, g)gv2 e.8:0t ,

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 of a buildiz).km gffq3 q3ng, through the air (air friction is present), to the ground below. How does the kinetic energy (K) ju)3g3m fqzk f.qst 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. Do not ignon16oiw fbfvg 04z9h f8re air resistance. How much gravitational potential energy did the ballb 4oz6fi9ffgwnv h018 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 o,b+ f2dfinvv2;/v g bvz.5o ouf gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the b/ vofbdu nv,.ovzb5iv g+2 f;2all 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 energy nfx fa1lj,b,f+a d.8;-simxh.

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 c/+r/ss wr6ipk:y5vw

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;jh scg)dv3o x7tno0 8a u/zk+ power expressed in SI units?

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 k u1,m 8tl:6)h)fwyc-igy 5s atfyq7r power?

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 in1gpt aj g5*(did 3 times the work in one-third the time. To do so, your power output must havt*1pgj(an i5 ge 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 constant0 uq+yarai;bdc*62iq r6) o z7ojo i-v acceleration, 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 vertically 2.0 m and held there. 5rndw+elg64 ilno2; fIf the object weighs 90 N, how much work was done in lift6o +ng425ndlie wlfr ;ing 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 3bvl.)0 ms6z78yfxq e-(gtnnt.uh ec1.0 m, at a constant velocity of 0.50 m/s. What is zqb.s.mu0lt nc t7x8yh-e (vn6g3ef)the work done by the 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 diqnvsjf2 j4 r6jq0g42p stance of 50. jg42 6v4qfjnrjp 0s2q0 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 constant force of 5500 N for a distanu(yk19mh/, .qjocya ace of 50.0 m. What is the work done by t/(o juyk9 a, .yqca1mhhe weight of 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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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*k9b wa.nvlj3y- d, c* pma9gt constant force of 5500 N for a distance of 50.0 m. Wha ,pgjl.9*vyd kwcn*a 39tbm- at 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 pulled 6.0 m upbq,2 8(/ m(vv bxzx8;tobwv:za7 pduu 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 fruizl lqcv- 196tut slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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 sister Sarah in a sled on an icy surface (assume no fr fzn 884lowj8diction), with a forced8w8lfojn z8 4 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 direction of the force.x7 y/8rj:xcjx ng2u4zam6* f0 1ix yvz The graph in Fig. 6-1 shows the force vry7 xi6 :0jzxv*1/84a fg2zcx xyjmunersus 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:

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 direction of the force. The graph in Fig. 6ihd+o;,6q ) w z i0mg,yr:futu-1 shows the force versus the object's positionudo u,y0gi,w6:mi;qt zrf)+ h . Find the work done when the object moves from 2.0 to 4.0 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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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in rb3wk- cko3a7the direction of the force. The graph in Fig. 6-1 shows the force versus the oor337w kbck- abject'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:

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 grap q0ddk.5s)gxnulk r5:h in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 mns kgq:xk. 5lr5du0d).

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 applied to move a 55-kg cart (initially at rest m .xupe (q6 ed)sdg.1m,uy3zi) across a 10 m level surface. What is the final kinetic energy of the cart?mg.qeydxi de,(zp361 .)sumu

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 o .y;vq 7vvn mx7)k8hvmf 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the finalv)vmv7 ;vhm. kq7y8 nx 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 a speed of 5.0 m/s. How much work is req vsvn0ac ragdvh 8:/,9y4a 0uzuired to stop the ng4yv0v z 0 /ha:, avscr8uda9mass?

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 stop a car initially 8rejy+*+r v hx t(fsr6(es n2cmoving at 25 m/s, what distance is required to stop a car movie( r 26rjnysfr(v8 +*tcsx+heng at 50 m/s under the 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. It is cocked by exerting kha0cp. 1xu6wzn6ok9g.a hd2a force of 20 N over a distance of 5.0 cm .n0 u2a6w9oda1hkpx h6zck. g. With what speed will the dart leave the gun, assuming 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 cx6/ ;f/m yx )9jhsxqqgox5+agomponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionlemf/jgsgoq 6 ;y hx/qx ax9x5+)ss floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is 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 g is s hzpfw8+4h.t/9yjqei/bk uq 5hot horizontally into a bale of hay, striking the hay with a velociipz/ hqwk84/+e qhf9by.uj5 tty of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the 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 o 1rwvt-c xs1mtu fzo+n39mp5ssc325r f 7.00 m above a floor to a height of 13.0 m above the flomvs-mc+z1c 19wsrn ru to f5s5pt3x3 2or. 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. Thu6;46(fw nv bn6jpqr bl s5bm(e plane is 4.0 m long and rises 2.0 m. If tb 4(n 6bqnsub5f(6lrjm6v w;p he 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 stretc( 6n++r hb8b3uhh)ll*y me0xy l)gciwh 2.0 cm. What is the spring constant?(hlc3)uel+) byxb6hh+ml w*n8rgy 0i

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 /sdpo.qzy/15h *v0hp j 0jmgm constant of 60 N/m. How much potential energy does it store, when stretched *dojj yp/mg 1z5sh0mvhq/.0pby 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 compress an initially uncompressed sprinr- ,l ty1q n 6)k6:ngpyobdk/lg with a spring16 t:-g/yplydoqkb ) ln,nrk6 constant of 25 N/m by 10 cm.

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 stretch a spring of spring constant 40 N/m from x = 0 *x)2b3 k bvosl+; swp7vyu.ae.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)o)kbxe uw7;say+.vvp* 23 slb

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 initially compressed by 3.0 cm. Hxjr kb.-i2yv5 ow much work is required to compress the spring a2vjb y xik.5-rn 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 froma u9 :7zh,5rp2omz znj the top of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slope? (neop5 jzanz,2 h7 z9rm:uglect friction)

A. 22 m/s

B. 31 m/s

C. 38 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, pushes off the top of a hill with an initial speed of 4. f1oks-t-+r3ix *s47qjih3 q h8 dzprw0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatio rq3j+ s14w-8odirq7hhi xtkf-s* zp3n?

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. At th i(nku)kmi )*n1)0ru zlbs4x:(om 6ie hdjn2 me bottom, it has a speed of 9.80 m/s. What is the vertical height of the planerhn(1 i)disnlnmk x64*o )bzj)m:e20k( m iuu?

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 the floor. When it is xksg.g(/ n4 ddih.2,rty du1q0.70 m above the floor, its potential energy exactly equals it d/ y .hggqsin 4dru,d.(2k1txs kinetic energy. How fast is it moving?

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 ground level witp c,f5u1kfv b;h a kinetic ene f5p k,v1c;fubrgy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To 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 kinetic energy of 220 J. Az kdh.os gi.a82 lm16 ji3*vobt the highest point in its trajectory, its kinetic enivibdo *h lmo3s z.kagj2168.ergy is 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 starts from rest at a point5i -chggx7ibx8:hz-m jm+2z o 45 m above the bottom of a dip (See Fig. 6-2)g+xx: im -i 2h7hgzmjzc85ob-. 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:

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 point 45 m aboveq /bdy3aqgh*np5kk(tz 6 f:jl8*k8jc 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 znkkjh8*qfptbj (ly3*/6 8d 5: kgcqais 30 m above the 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 z d.n;)+- 07bmodfhycijw- kd 30 m above the bottom of a dip with a speed of 25 m/s (Se-)k - f .oc7md+dnbiywzd;j0he 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 of 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 thyq+6npl9lv0 e kf84rme 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 2-kg pendulum of lengrce7s9u3aq8e )vb ypry6 4,bmth 50 cm is pulled 0.24 m away from the vertical axis and released from rest. What will be its speed at the bottom of its s9s4ey mvb8 7rcb,py6r)e uaq3wing?

A. 0.329 m/s

B. 0.877 m/s

C. 1.316 m/s

D. 1.097 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 at 25 m/s hits aih4)cxm o mi-wqqu(4 f41uh.cn initially uncompressed horizontal spring with spring c4(iwoxf.-mqmu i4 ucq4)hc1honstant 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 carqn/p-:mxhmp : to stop for a red light. What work is done by the friction force against the whm-:pqnhx:p m/ eels?

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 betwqn2; ldf (kla2een a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dista;k 2allf2(nq dnce will it slide before coming to 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 rough, level surface. It has 24 J of kinetipgwu 4lf53a( 5h ln-x1flz1c dc energy. The friction force on it is a constant 0.50awd4luz -x1(chf lplnf55 1 3g N. How far will 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 toby.a-wv5,4qbb9uiz s a 2.0-kg mass on a level 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 the change in its kinetic e by9wabq4 sbz,i5v-.unergy?

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 rest from the top of a 50-aa6wnr /bx :6mm high slope. If the work done by frictio w6:maar6 bx/nn 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 plane. The plane is 4.0 m0s+( ,w6bf8plvf+dag6nlh cx long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on tha8 +lf 6 v0s6cnhldfg+wbp x(,e 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 plauaa dysya 8 ;,9p44jbx9l6hi rne inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be th4xaai jya 6u9h9sry;8 lbp4 ,de 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 -dpl- zeq t(kjh(3oc)w( a, l7.wejwaa height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on itwle3j,( j). c-tl z oahk(w7 (w-apedq as it falls?

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 when he runs up a flight of s bh0;gag+l ;uatairs 10.0-m hig;h+0 gab;aulg h, 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 velocity of 5.0 m/jsd xator6 k:g 0y3johe 3;f0)s. What power must be delivered to te:xs30 do3gj;hf 6 )k0yjraothe object by the force?

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 hp motor that runs for 1xbh+fv5xs , i..y 4wfh.0 hr? (1 hp = 746 W)hhx .i f,f 5by.vxws4+

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. How much 9g ;fpf:f:xs.yzp -yr force does her foot r:g fsyf;pxp :9y-z.fpush with when 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 25 m/,5nba8zs2v j jeit/n/s in 7.0 s. What is the average power delivered by the engine? (1 h2sent ,v/a/ nz5ji8bjp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95