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

1#

What is the correct unit of workvik 1+fz+kvl7uu)3 2h2 s/ q uod9udzk expressed 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 system if thtt lh79)kl)z nere 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 briq/pyx 9vh* jjm 5rox.1ck wall, the amount of work you1p9 yx *jx.h/v5mjo rq 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 bdtq4doiux : c5 v1)fz9km+ju;kc;r2 being held there. How much work is beinkt xkr:;u2c 9oi1 d)q4mcf+jb ;vd5zug done in holding the box in this position?

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 horizontaxge8 .dgz7j2)e z+u yilly forward at a constant velocity carrying a 10-N obz.j+ g z)gi7ee2yu8dxject, the amount 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 returned to its original pt ffcg74f i*n;osition. Iftff 4*n7f ;gci 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 actin2wvit7 39yu 5dhtyia hf e;e14g 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 the sign of the work done be:fn6n ki. /p*103wlzip z ccey gravity while the ball goes up with the sigz6:enkfnczcw0i * /l1p pie.3n of the work done by gravity while 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 positfn*mqpmwlzkabk5 180pk3 -: 1si g5nyion (F vs. x) graph, represents1* 5mki w8yk3g1n mq b:p-pln0fz ska5

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),c,aq2lh-wn7/ a r dk:u what represents the work done by the forwk7lahn:, /2cuq - rdace 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, then the object's kinee4a0peve(n9gz/ e- aftic 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 negat7kp0icv*l y) i* 3/thn9ipcm uive, 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 object is zero, then the object's kinetic enya l.4v:the,p-, pekqergy

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 t kw:e1xyk: ux2 c+fbt8w8tlv4 he speed of the car. Which statement is true about the truck's kinec:yw 8t2x:v8tk ew 1f4l+xkubtic 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 fast0fb73u gn 5ga2-tvla d as car K, and car J has half the mass of car K. The kinetgv 0fg2ana5 d-lut 73bic energy of car J, compared 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 speed. What yc t)9g6ke .1wvi,ds ais e6wtayi,s v9cd).1 kg the ratio of the final kinetic energy 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 spee: (c,r 9catigfd 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 ma:cc gfi9 ta,(rss 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 mass nb+ obrot.odtf .5ps2n9vx );is moving with speed 4.x p2t+no 9no)sbfr;ob t.5v d.0 m/s. Both objects encounter the 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 brakesdmfq5 h/qtr/zvvz4 h7pc(1q3 of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what dista zzr(5q d hvc7q/3f1/4 htqmpvnce 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 orbits the Sun in an ellipt;cuce . cs+/o; icvqh-4 sx:eoical orbit. Neglecting any friction effects, what happens t :ixo;sc+-vos 4cqe/c c.hue ;o the planet's kinetic 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 princi;k7op1 ar+,x6mwub j3-bvxojple.

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 halsaa+g/di6s lt *:yq6zzu1 f +ve 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 hei.qpmpp8 . o*m4gcmdi ,ght h above the ground. A second object wim .o dgi8p.,* cmpqmp4th four times the mass of the first if released from the same height. The potential energy 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 s1d+g) f1l dmojhl k41ttretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sp4hlfk11d mljd+)o1 tgring 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 of1cjrr )ut.s b3 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 kineth 1oc (c)zndroi:./2z/g/vd e.pv * cqbf )rkhic energy K, to its potential energy U.*cr2zerz. nh1/.pg/dfqo vc v b: h(d)) o/ikc

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 car driew 375g blno:+vh 6 w*eow4srwving 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 and a very heavy object are sliding with equal speeds alol v5tb86bw8x3xuvd2 bng a level frictionless sx 8 8bwuvbtb3lx25v6 durface. 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 /vv))ml oz z-k$m_{1}$ 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 conservativv;0oo 946b amod5xkw ie forces.;oiow0 vka 6db4o 95xm

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 ay * sz. h*ty*/b:xqk; sfoyqf8 building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to t q.k fs;sz:f*hy8o xby/qy*t* he 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 e ga2fspxm+6c0nergy. Do not ignore air resip+c26 mgfa s0xstance. How much gravitational potential energy did 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 gravitat54q. xyba1j 3p*jmp.xa u1hytional potential energy. Do not ignore air resistance. How much kinetic energy did the ball gb5x.1ym 43.jq*pu1xthp yaj aain?

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.fi;uya 0)jy 5sc xxc(;

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 isr(p88 7whvdv0-g -foitf6wo nmyy //b

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 expr)4t jwwj0c/lvdks8se2 x 6ra-p- 2 txeessed 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 p f3ht d-s.*jjn7rua-r ower?

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 sgzg y3q;a8rin .ig;y8v 08cytimes the work in one-third the time. To do so, yo0g; ry zayq;8vgyin i3 .8c8gsur 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 aofw +on8ua(k; constant 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. If the object weighuzg,kx(yg (p (s 90 N, how much work was done in liftin ,gzy(ugxk(( pg 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 m, at a cqu2f2t d3zuo ;pn .2yhet((d honstant velocito d2zyhfe(dh;qt .23 nup u2(ty of 0.50 m/s. What is 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 f n lm5re muas,q6f86c2orce of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N foa5c2 elf,smm6rq8 6u nrce?

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 gtw, gbb3h9 dk5(h/9isosdw 8a constant force of 5500 N for a distance of 50.0 m. What is tk9d8iogb3g h9dhws/b, s5 (tw he work done by the 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 pu/ixnp yidg5)-lled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on5yd xip/i-n)g 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 hc*xqset/r (anzgl v/ a.23ck, ;:twdup 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.6inh) eqfxhs6db) *p 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 jx9e8(igl. fepp 7r9h in a sled on an icy surface (assume no friction), with a forceee9 l.8gpx j prh7if9( 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. The grap7ds+ dezmd3.o :0p,sj1hu jbjh in Fig. 6-1 shows the force mb. sesujz:3dd 0hd17 jo+,j pversus 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 thh1:zsw heet 9+e 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 4.0 mz +:h9stweh 1e.

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 the direction of the force. The graph in Fig. 6-l6y4b3 0mczgaijcv wh2 a.f ..1 shows the force versus the object's position. Find the work done when the object moves from 4cj2calhb . z. ifv6gm.0a 3y4w.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 thsat)6xq5l1 (jqaemy .e force. The graph in Fig. 6-1 shows the force v6mj l1( yae5s.qatxq)ersus the object's position. Find the work done when 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 9t3 r;-vkz5if rf3chflg5bp 3is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic k;r33rl5fihctg zf 39 vpf5b- 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 N is appliej qeb*3)2kbcyd to move a 55-kg cart (initially at rest) across a 10 m level b*kbj23yec q)surface. 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 ao;ne2x cr9rhx 3fr u(avf e)33 speed of 5.0 m/s. How much work is required to stop the nvf ef3oxh;29 3arcrrue 3( x)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 stseo;yq) 2,f+)q mapoqop a car initially moving at 25 m/s, what distance is required to stop a car movis)+2oy ,o)fepaqqq;m ng 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 iumw +a8) hd4gxs cocked by exerting a force of 20 N over a distance of 5.0 cm+d)gwma4uxh8 . 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 component of 80 N and a vertical componen*q 2msxat 3c5yt 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 along the smt2 x*qyca35 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 isrm6tntwmo3 +4*rlzbid(64*c . tt gxt 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 the averati+ 3 r zntmb* lgm6t4(ro64.t tcw*dxge 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 9s:glre,w *kj s6na au4(atd2height of 7.00 m above a floor to a height of 134,wrst2u se (a*:l k a6gdnja9.0 m above the floor. 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 y)dzc n ;yec0.. zhn/cplane is 4.0 m long and rises 2.0 m. If the plane is frictionc e0 zn)dyz.c.y/n ch;less, 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 ont rabf(ixwmkr f*5+ n8 om.2p(qo a spring, causes the spring to stretch 2.0 cm. What is the spring ki wxp 2a(fo+rmr(fnq .m* 5b8constant?

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 q,o (ngp rp-(sq .4+d(mn nqtyspring constant of 60 N/m. How much potential energy does it store, when sy,4n+m qog np rqd. pqt-((n(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 cz 3m1ax)i4x owg9 lob*ompress an initially uncompressed spring with a spring c3zxbw olgm9)a 1oix4*onstant 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 8qttmpke*bi5rc 1ow a.d+ +(yto stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the eprotq 8c*btw+y+ i. d5ka1m( unstretched position is at x = 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 initialo1 ;c0n 4*dj hv gdso0yjh8l+tly compressed by 3.0 cm. How much work is requihd n08toog sh 1lv;jj*+4dc0yred to compress 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 top np2i.cg;ydq9 of a 50-m high slope. What is the speed of ;igdyqnc9 2p.the slier on reaching 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, pushes 7fp8kc s5zdj pv*lub) g-m-2ooff the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, hcpk-*pdj zof5ug- vm7)2 8blsow 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 inclin+m2hhisumwya.n2f r+ k8h 1 p9ed plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height ohkprh 29f8 ya+ nmmiu+ w1.h2sf 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 the floor. When it is 0.70 m above the floor, its pot, cggrcxzg3ndc8+ 4 ;wential energy exactly equals c8n,wg4rxgz 3 cgcd;+its 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 grou : d5w5nhf9rem1oqse,e 4z4nond level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical 55hmr1 :4oeo,fqdnn4swe ze 9energy 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 kineticdz 4emu pfgyq3bis ) k/ie)91) energy of 220 J. At the highest point idpi3) bqkmgz use i )eyf/491)n its trajectory, its kinetic energy 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 point 45 m above7kjd7pz/o3 qy the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of k7oq3jy /7p zdthe 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 above the bottomo4 f95z3cajbd;dyadr c8:vm* of a dip (See Fig. 6-2). Neglecty9:8facd*jrc zv;3 bam5d o d4 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. 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 botto9 q a2xnjglm n;uvu8-y1z.8x lm of a dip with a speed of 25 m/ 9.v yjl;-2unu88xml aq1xngzs (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 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 the bottom of its swio 3xqvxk(3n;o ng (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 cm away fromb-naa*6o8wt e the vertical axis and released from rest. What will be its spa*-8tao nw6be eed 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 at 25 m/s hits an initially u )yf:g t+ndbwvj,)hxp lo7/j8 ncompressed horizontal spring with spring pjn)fv) l jy8to/dx7wgb:+, h 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 t1 n+1+wn,zxi3w0 r9pkrsbw )wz:he hher 2000 kg car to stop for a red light. What work is done by the friction fors z +n,r9wt3r0bk ): w+nphwewi1xhz1ce 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 horizo.vmzww 0 hmk 184d6kktzsm// ontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slidw6vkzmktm hsko m/814z/d. 0 we 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 9,rz bl70i t4)qauqhqa rough, level surface. It has 24 J of kinetic energy. The fr h 4irlaq0q,u9qbz)t7 iction force on it is a constant 0.50 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 to a 2.0-kg mass on a oc;.,5 a qw-elrnuk5slevel surface. The coef- o,ruqw.ca nkse ;l55ficient 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 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 rest from 0wpnuwu 08oa2 the top of a 50-m high slope. If the work duo2n ap uww800one 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 iowmps6i (d)-ujr j 3/es 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the bo-/ri 3)ud(ewjp6josmx to the top of the plane. What was the magnitude 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 plane inclined at fv h4d9rrzo qi4f6e/-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 sli6ze q-rdr/o4 fhf49iv ding 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, w:x-1,mtp(s ool c- yuand strikes the ground with a velocity of 7.00 m/s. What average force:upm oto,(lyx 1-cw s- of air friction acts on it 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-h;u2dh n2mbwte/zy i va5e -3 stairs 10.0-m ew b;ez2yn m-2h /-tv uad3ih5high, 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 wi(:-p.x)in*m9j ,:q 8yr:lunvwptl bg3 jonc ith a constant velocity of 5.0 m/s. What power must be delivered to the object ::o g-9bluw8:jy3 cnmnli v) ,pprjq .xi(t*nby 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 tk f wpi8mtf50at a,ob.gi :7ew9 pnea rn+8v;*hat runs for 1.0 hr? (1 hp = 7av*orebn ei fw ta+5 m88t7 ;fpa0w.n k,:gip946 W)

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 force does her q:4 yqz9 g4+1ggnbr4oj phmn( foot push with when she1(+pjrh gnq4z9g4n4 gyoqb m: is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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A 1500-kg car accelerates from 0 to 25hefu nac pxb3+a:r ./6 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W)6efn pax/a c+.rh3u:b

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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