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

1#

What is the correct unit of work expressed in ,0rx7kqnj;phSI 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 yeni )9 a8maddgocxk (7jm*c .58fi:sif 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, tt3p ei6u,2cl vhe amount of work yo2itl,3 cp6u veu 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 ah5wc )jc9rqs ;nd is being held there. How much work is being done in holding the box in this posi ccj)hr;95qws tion?

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 constanbj zuvnqu29 v8;9pgc(t velocity carrying a 10-N object, the amount of worvpucjg2nzv q 9(;bu98k 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*v y1. 95w u+br-;pknujetab f 3.0 m then returned to its original position. If the total weight is 30 N, how j-u bn+yte;5w. fb vp1ka9u*rmuch 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 act))g2s5 mknruh ing 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 thee4+ qf:zzh.ygppr7 /e sign of the work done by gravity while the bal. zqrhfe74pyp:eg / +zl goes up with the sign 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 position (F vs. x) graph, represe+9/mino 2vvk bnts/ 9bo2 mnivk+v

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 represe)or rt.+qjt:heqe6b d0+t x(cnts the work done by the forcxrht .+erb:tc +6)qt(joeq d0e 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 2 +tr8qki me0e1u1 bvrobject is positive, then 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 isf uwjrxaq9 44: negative, 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 ob)bmd2:f:qrbm6 +ximx ject 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 a*wj 6 ao9cdny3 ,7 iiuukut0c6s much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's k6,i 0d 7wkiouu9y cntj36ua* cinetic 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, and cahy9nmohl -;w ey qc:bo4i5 94hr J has half the mass of car K. The kinetic energy 9:ooi 4hh;5nm4lc y-ebyqw h 9of 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 origi-9oco-r1ej u rnal speed. What is the ratio of the final kinetic ene1-j-9eruo c rorgy 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 pebble is moving akm q hrtu119mh.x f6g:t a speed of 5 m/s. If both objects have the same kinetic energf tk1 6r19gqhu:m hx.my, 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 mass is f v5:p. 8g o.oim4sidvw a1.removing with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels thef:is1i8.av ro5pe m .d4.vo gw 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;ohb61v(fqg1ftkpp6g *vj:n a panic, and skid a certain distance on a straigh tfp:(6fh 6v1v;p1*jbogqnkgt, level road. If you had 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 nf2s a7ai4sx;m.i.olorbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's os;4na .la.2iixms 7 fkinetic 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 nypuk,. ( w:wnprinciple.

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 negative +7 rsx7nn z6 kgrn)oq/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 8not 3l smk1m6 iep aptk,q479rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potea p34t1 m6l9mqokit87 knep,s ntial 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 str f(-ybdo+r :wi:,yjuj etch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential ed:yjbuf :,+yo( j-iwr nergy 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 systemffof2,qxp z1/

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 energy K, to itsx2pu4 8c6l s/rhryjg3 potential energy U3cpl8 ryu2jh4grx6/ s.

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 drivin1ou )9hnnmm;jg 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 andhx+ l reqim-c08 5 fk5qxqj;a* a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide upfqkq8ir- h5 aj*+l0;eqm 5x cx 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 zhe2b.phud-vj3 gatc(( :sc 3$m_{1}$ 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 conservative forc7jv)78 hpjeu1arto ph3dh 1w:wg9l r0es. e97j:vh3o l hu10)r1pjr8gtdwh7awp

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 building, through the )fqb;v+w3:3igcx mi.m*p+qb7 zv w maair (air friction is present), to the ground below. Howxv)3 qvcaf mm *pzw+bb; m3:iwgi7.+ q 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 gqmz uukukc,5dv.j )5t d.(l4J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose?qjm4d.tluu5 kdkc5 z,gu().v

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 potentia2 setcbk9q+u pvr0-m6l energy. Do not ignore air resistance. How s- 2k m+vctbe60qup9rmuch kinetic energy did 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 conservatilf24 ij ,s3cwoon of energy.

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 iskiwe d9vce +5)+k2-f*d+khub h n hat7

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 unitf7sjb5ux1 .wt s?

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 u 5j1-ctg jsy2dnit of 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 did 3 times the work in o 9mwo/h3;t z .nwk+ 1iw(grfxone-third the time. To do so, your power9i zgfw 3n hxtw;.w1/ or(ok+m 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 k -. 0ndudfum*ypf.6xconstant 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 1d8b +p)+k xo i4y;3begxszks weighs 90 N, how muyzgkxxp8+3 )b 4s1k+eo;dbi sch 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 1kc) q/uj o(a+p.0 m, at a constant velocity of 0.50 m/s. +p c)j/ uko(aqWhat 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 force ; u:b wsfwl2eb510xwfof 5500 N for a distance of 5bf0u;b 52slw :wwfe1 x0.0 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 co hbvy3:szvn5ys7kv; 9cg(9 aunstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of th(nuhz 5:v3 ycvgvb 9ysa9sk7;e 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 constant 67qwq7mwb)k d force of 5500 N for a distance of 50q7 bqd6wk )7wm.0 m. 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 pulledaha2w8e exl ,ckd; ));st2r bj 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 r(tpf1cxiyx;bp2 )/ gt amp, 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 sm),rrwh;5k t5:8 h 0 o)quunle7mgzkgled on an icy surface (assume no friction), with a force of 60.0 N at an angle uehrz8mg 5g7wkh:ln)) ;qkt ,m o0ur5 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;6i v. r9 ddkbw:ci,fe the force. The graph in Fig. 6-1 shows the force versus the object's positiovi,cf di6bre wk:9;. dn. 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 drkw+ popzb0cs+ zz:m+w;o j89irection of the force. The graph in Fig. 6-1 shows the force v+;s9po wz:p z jwko++08z crmbersus the object's position. 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 the direction of the force. The graph inf9ll6upxjl0 o pja -/2 Fig. 6-1 shj9f ppojl/x ua l2l6-0ows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

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 direc,nsyi s .z+a;wx 6v4xntion of the force. The graph in Fig. 6-1 shows the force versus the object's pos4in. xzv,w an+sx s6;yition. 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 2v :.2icmto lo(e8ai2i3p l0 ws00 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final8cola .iipto :3 l(ew2m02 ivs 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 N is applied to movvkcet fsd+q,n: kg*p.93lz uu m*;ml+e a 55-kg cart (initially at rest) across azpkmulg*v q,u k*t +. 3;fdescnm+ :9l 10 m level 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 a speed of 5.0 m/s h 54lh36s1gqx k8zclm. How much work is required to stop the ma1h3z 8x5s4hlk g c6lmqss?

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 l ayulc50v+ *v25od -kvwahm :stop a car initially moving at 25 m/s, what distance is required to stop a car moving at*u +avl-:yw v cmdok02a lv5h5 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 cock5g 4,ieih7 bpwed by exerting a force of 20 N over a distance of 5.0 cm. With wh h47,bpewg5i iat 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 5bamy6s i ;jb1and a vertical component 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 floor. What is the cart's final kinetibbyj;i165a ms c 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 shot horizontally into a bale of hay, striking the hs-2q-,q -rm 1 + 3dobsuvrsfduay with a velocity of 60 m/suqq3u1o rd-,sv2d-m sf-rs +b. 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 of 7.00 m above a floor to a her8w+wolu7o h9z r3n. fight of 13.0 m above the floor. What is thehwf9l u38.nroz or7w+ 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 pushedfc96; h(3k+ey p o-ht:whycnp up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionlphyko- h6:;yhte(3 fcw9n+c pess, 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 djcr b)i+57ai 6t2dh3 p g7i3rguj)vvstretch 2.0 cm. What is the spring constan67rvd+3pia75dv gc 2jbr3thji ))ui gt?

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 constant of sat*o-*3g y r 9,gxqcf +um1gj60 N/m. How much potential energy does it store, when stretr x9so*g3 +au,c*t -yj1fgmgqched 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 rz;a/nb6qvf t1r ;sfnr,zv/8y) sanr1equired to compress an initially uncompressed spring with a spring constant of 25 N/m by 8azvb /;rrfq6ntv /,sasf11n;rny)z 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 cblj b;5 ij8dr5onstant 40 N/m from x = 0.20 m to 0.25 m? (Assume theb 5i;8dl5bjjr 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 initially compressed by 3.0jv dy( -c mqii+v+r3g: cm. How muchg-v+icr(+d3 iyj vm q: work is required 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 from0,h,dr tes7dp rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bo7 tpdr,hes, d0ttom 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 off the top of a hill with an iecyv e.cfy52j,5k +k9u( aswc nitial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 c 2s.u c9eay, kkfcy(vj 5we5+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 74u xup1sqaoe15*yd u frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height do 4p5qux171yu ue*asof 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 f .y.o:w pl ;ir8br0dam0f l3iploor. When it is 0.70 m above the floor, its potential energy exactly equals its kineticwy8;.b a3r:m.di i0 lpofp 0lr 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 leooupi 70: ts;rvel with a kinetic energy of 40 J. At the exact top of its trajou7i0p :t so;rectory, 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 soin4u437)aqu yu m4fleaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinu f3umsi 44yo)n7qua4 etic 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 a7dad9*lr/tg+d g 2b irest 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 is 30 m above the bottom of 9raddta7g /+2bidg*lthe 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 poiurl2;fp zcx x/* nh;2xnt 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;l2c/xp2 x*n uxh;z fr 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 ityyhp; n4ie3u9 lc34a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will lc et;y93 y3h pii4u4nbe 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 swiry6b,y/ ykfv6e3 a8qnsz+kn/ 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 c jkh)mj.-2g8jyv: jh cm is pulled 30 cm away from the vertical axis and released from rest8v- jj)2hjck.g jy: hm. What 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 ba(jbvf.(i qp*c1 fk6 at 25 m/s hits an initially uncompressed horizontal spring with spring constant of jbvp1cfa 6qfb i*k.(($2.0 \times 10^6 \; N/m$. 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 2ho6urva yi t 4*/f83bktfrm5at 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force aga2bvrf*t3ui5f4mr t8 ohk6ay/ inst 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 horizontal surface izqk+mu .z*1g-/f jqg p 2z-yehs 50.0 N. If the initiugfpkj2qz yq- .e+*zhm/ -1 zgal speed of the object is 25.0 m/s, what distance 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 kinermo5 y ;o(j,zntic energy. The friction force on it is a constant 0.50 N. 5yoonm, r;( jzHow 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 level surface. Tht 1 dtnhrq-gkn r20kb/pt(:*pf0m ov+e coefficient of kq(p0:tnnrrkovg-+t *1bkp tm /hd20finetic 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 restyzt2k64cc t n( from the top of a 50-m high slope. If the work done by friction is 2ttk(4cny6zc $-6.0 \times 10^{3} \; J$, 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.ta*oe2h 2kx6v0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What wh*vte2 ao6xk 2as 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 twih; yzm),qk 3s s2bo1op of a plane inclined at 20e above horizontal. Tiy13 hsok;zs,)bm 2 qwhe coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along 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 o)bqo n 9*d, lh6uph 9zoau7pcqrl 4x3.f 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it4cx9l)po3 ur9q h*h qou6,.ad l znpb7 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 enmpm*(jcb cw 7v88 g8rfergy when he runs up a flight of stairs 10. v8m(p*rfcmg8j 87cw b0-m high, 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 cd)a6 nriu*d3i /)94 xrs3rdu(xlxh q an object with a constant velocity of 5.0 m/s. What power must be delivered )9dndxax4s6x3u rdi c iqurr3/)(hl*to the 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 thatl:jj;4 (ay mhb runs for 1.0 hr? (1 hp = 746 W ybhma:j;4(jl)

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 mo,a(y4n yy zug ljn2i6,bsl05uch force does her foot push w ba gzln2ly,j ius4y6on,(y 05ith 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/s in 7.0 s. Whaal c3 +ak;ob8vs*jw l:t is the average power delivered by the engine? (1k sc* o3b;wv 8all+ja: hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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