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

1#

What is the correct unit of worqx-y5oy jgk .5k 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 thd adh;h+v4d3 f :6dq kvwdw4e3ere 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 amountr47e oo lh9,r/ :rygd9ajft7l of work you9l, /do7rofgyhr e9 jl7 rat4: 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 anwh(g-m dq k/pg5wx 0e7kn3j.nd is being held there. How much work is being done in-5kxngjp.d3qwngw ( / 7 e0mhk 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 horkhfu:lt ulitkik3 55(io ;0 :tizontally forward at a constant velocity carrying a 10-N object, the amount of work you do i0ik ;thu3l:l t5t i:(kuk5io fs

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 originv2.7ekoayc6owz+e1d,o ij 0 wal position. If the total weight is 30 N, how much +oki z,6oevwj0ao2cd7e1 .w ywork 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 5/aa:usup-l*fpfnc i 0sh ;-xacting 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. Co,9c7 74) nxesdsamps8 xpwggz6*2akqmpare the sign of the work done by gravity while the ball g279a 6 wn )exspazp*ggqsxmc4 7ks8,d oes 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, represea6 e: pc)j.fqqnts:.qq cefpj)6a

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 represents the w8fhq 8q5f1tjx 2s0lylork done by the forxf5 8 j81qth qly0sf2lce 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 ob0b- 9ige.)7crpnf 2w hjw.xw p 0fgll0ject's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the objecta cxagou*;4g2r. smp 17b fr9y'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 oo,6p t0fv)oh v*f xg6fbject'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*w b7c7+ rp3uzf 8x-xugu wgc- car, and is moving at twice the speed of the car. Which statement is true about the tru 8 r wx7*g- xc3zcp+bu7wf-uguck's kinetic energy compared to that of the car?

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

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

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

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half th(3aco -xpj8ime mass of car K. The kinetic energy of car J, compared tacmx(-p8j i3o o 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 speeue;,y ouy3;na9iu*zn 9ox- j t.ais w/d. What is the ratio of the final kinetic energy to the initial kineti o 3;ni,j s*w/yuizutan e x9-ay.;u9oc 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 pe-tnae+u/, hw 2ujnj2ebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of t j, huatw+nu-e2nje/2he 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 moving with s1v)apvqkur0 1 peed ) kr1upqva0 1v4.0 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 brakes of your car in a panic, and skid a certain distanceagv 5h;we nxm +6wo7th9i ;1me on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditi76 9;hamwwvm 5xg+e to1ehin;ons?

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 id -zudf-xb5;pogl/ , orbit. Neglecting any friction effects, what happens to th ldg;f xpbu,dz5/ -o-ie 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 pl , j j ,:doxrn+7dc5o/7c+sohqo)qynrinciple.

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 negativek69bzrciy44r potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above 5dksuzl 7hh.: 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 objes5 u. :zlhhdk7ct 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 attache3 egewi0f,ap;gb; js+d 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 potentialwipee3g 0;j+ab, g s;f energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a syst)mv;exx mss nv9w2(6 zem

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 tr45lklmdw:. q/ vqhdewb g73;sb p /q)wee. Compare its kinetic energy K, to its potential energy 7bqk5qhem)v w//:l43sdw d;p .b wqlgU.

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 z+*uor05 fv li ka3qxy6sb48xcar driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speeds atqmxj w)0;-dr0p a e sdc)u*8slong a level frictionless surutrq ) a)e08j *xwc0m-;sspdd face. 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 i7u; 2rq s4: tv/sxbw fl+ 5u+df5vtip$m_{1}$ 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 xz9cd / qk s,/lwvc5s4of conservation of mechanical energy for conservative forces.zdscs /qkw94xv5c , l/

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 air (air friction is presen jp/awd 1h3:ezt), to the ground below. How does the kinetic energy (K) just beforewaje p:hz31 d/ 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 ga*ou1-6 8 3kphhkxe tehins 30 J of kinetic energy. Do not ignore air resistance. eh*kth 61 p3u koe8-xhHow 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 grte6wfymz b85 gms3 gu1pjm*1(avitational potential energy. Do not ignore air resistance. How much kinetic energy did the bal *mpmw38gbgjm 561szyf e1( tul 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 energx5up7v c 8dn j2z02nony.

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 is9nx+69h wmgd8g ;flk o

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 ofu:ycu+ , 3o 56ljx dhuu1w:ers 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 3qe;fco+-e j6zejyv lazt0 ;)unit 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 one-third the time. T n*v e34gf yi;vk4ki oe++ 2trdb6buj6wbi:+io do so, your ob2:d6 y weni3+i+ku4jbg b 6t;i ife+*vk4vr power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine ene yppr+:4g/+yva*5 s,f eyhmust

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 andw 2kwly0fboq vn etzf,9 +,.4i held there. If the object weighs 90 N, h9f0qwv. i,z tklwfb ,+n o4y2eow much 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 v f;(,fnuc5pgp sd:ts.m)lk)1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the)sd (n;5 ,:vtgpf)u.slmfkpc 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 :.qh uz/0nq aha distance of an u.z/hhqq:0 50.0 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 co5r5.o k3ybn .nsj hw8xnstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevk5x3sh w. 5n8bjyr .noator?

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 upwar*:ycm mucw *v.d with a constant force of 5500 N for a distance of cwm:.c my* *vu50.0 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 pulled 6.0 m up alon t ) rapm*8wmq **ka.ac52nsjyg 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 sy w)6qybsizjz sn* ) ))yiqg0-lides 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 sjp cypefx); (6ister Sarah in a sled on an icy surface (assume no frictppcj6 yf()e; xion), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grap m45zs7pa 6 fa,esnool8m+c) rh in Fig. 6-1 shows the force vn6m,a5s of7lmr8 +4 pzac)eosersus 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. 6-1 s0j0nq g)mvi1 m8*v)p tcxsbt .hows the force versus the object's position. Find tvp0x bq.g 1 vjttms)m*08)in che 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 in Fig. 6-1 a17ele :m1leira0 6vk shows the force versus the object's positvrm0 a1iel l7k6:e1 eaion. 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 directihbk n z:zf(yqwfu 2- 7r(;kkc3on of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find thefb7 znk(k cz2kwfhq:ry(;- u3 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 is applied to move a 55-kg cart (initi p ys261crs4eoally at rest) across a 10 m level surface. What is the final kinetic energy of the car42 yo es6s1cprt?

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 appl-l j qbf4zg2/m sin+ ijq-*dw:ied to move a 55-kg cart (initially at rest) acrosq2jw+s/z -4l bm*ig :qi-jfdns a 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 movin9m ll(n0pwrdi 5 lcs3we7(8yzg with a speed of 5.0 m/s. How much work is required to stop the m8ly r(3isz9c(n wdlw0 5mpl7e ass?

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 moving at 25 m/s, what distanc weqcj c:7zwgy5(j xdr*h9;c/e is required to stop a car moving at 50 m/s under the swrz7c *c;j ex 9c(dyjhwq 5/g:ame 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. Itdt2qo (gqnkpy 31;y4 13varl 9hiu*eu is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligiuktiy9r4v(egaqp31*l1 u; 3 n2yhdoq ble 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 8n 1/tk k7i dj+0klh3km0 N and a vertical component of 60 7+tdkih0m nkk3kjl 1/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 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 shot horizontally into a bale;mpex s, or7)eshjyd bp 2+7i8 of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the a7 ,;2ep)rh 8sd7emj pxso b+yirrow?

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 7gan h ;1pb*yc(.00 m above a floor to a height of 13.0 m above the han(c; *bg1y pfloor. 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. Th5 zy)gpwd1 fj:utxdl64 9+oo ue plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the push?u p9ywzt j:6f5 dol4ud+ o)g1x

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 spg5mv3p5ame+di 9 pca)z)9hiz ring to stretch 2.0 cm. What is the spring 93 ahegzm i5)zpp)+i59advm cconstant?

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 ssi,pv:f1uc +qpring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0i+uv1qc: , psf 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 agfgfxny59duwj7w )v ygo ;y255f ,+gvn initially uncompressed spring with a spring constant of 25 N/m by+9wdg 2vj)yy7 vu 5gf;fggy5f on5wx, 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 spr np6(grm5kps4bs/ )dh mr5-b wing constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position i( p m5hb4k-6)mgr 5nrpd wbs/ss 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 3.0 cmt jb-17f11 mltilc ,zs. How much work is required to compress the spring an adfzs 1 c-7tlli bj1,1mtditional 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 fro+q 9.nx*bulv .oqpl4yj e1pn4m rest from the top of a 50-m high slope. What is the speed of the skier on re. +p vql bnnq49lu1x4y o*pj.eaching the bottom of the slope? (neglect 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 + iggcr2qtgji45 2u2wn a,1d gkg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fa qagu21 25ggjg c+d2w,rni4tist will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plan g 53zdwljs92le. At the bottom, it has a speed of 9.80 m/s. What is thelglz5 3jwd 9s2 vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m anegl5r 9h 0kcxgr:* 41qfcuaa+8o l) ubove the floor, its potential energy exactly equals its kinet o+ul)4gkrcu9q 8c5g n1f:re aaxlh0 *ic 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 hu0;edj(z6x 1g; u kaxnxhp46 with a kinetic eneakp ;uu6exjh 41xzn g6d0( x;hrgy 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 gro q4x 9 lh1zn*wf(ll5hrund with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did w l1rlzx4q95 (fln*hhit 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 43zkhm8n,l hx 05 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed l0hz3nhxk, 8mof 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 ap6;njs1qz9amwl q(: a 6r+gx m 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 to1qnq6 wp+m9 alz:ja ;x rmgs6(p 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 poinu 6.a.w(7lin7owbr wkt 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neu.w7owl. ka(6br w7 inglect 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 itg,dr7 +gepne4s 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 length 50 cm is pull 1 f)nfuy i9+vu;:n;:nwvebch4f 5t voed 0.24 m away from the vertical axis and released from rest. What will be its wf ; 1vfif9n5n4nvtub+;)e vhcyu:o: speed at the bottom of its swing?

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 an initially un 6ezx4c ald pfa/p7m f46iq)w(compressed horizontal spring with sprin(fa)z/m4apc6piw746 d f lqex g constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop f,orb jqyk)+ i:or a red light. What w, jybo+: riq)kork is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg ;,0rri3iy elvobject and a horizontal surface is 50.0 N. If thyr i0lr3e,;vie initial 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 surfea ;ys ,b2gu6lace. It has 24 J of kinetic energy. The friction force on it lyb;6 us,2 eagis 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 2.0b*l/z:, nyqz5 61v kxuzedyo8d)p wn;-kg mass on a level surface. The coef d ukl8dn/wyyp:z,;6ez)b5*nxz1q v oficient 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 the top of a 50-m high slope. If the work dx5 kf o ;3hjx/ork(z/ l3k*gadone b /k53/*lokazg k(x 3df xojh;ry friction 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 plana8tv:ha14 ,us mv p-wve. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of vhw,v uvaa-ps8: mt4 1the 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 in2:y,8ptul hr hclined at 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 sliding 4hl:2ryh ,up 8t.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes thep hz4(jnn2jzkez: mmkw )t5p4zvc- * 1 ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it fallskwzz4mjnt)5jk *(2ez hn:m4-ppz vc1?

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 runl6 .c nrd.oqw+j,vkpk k4u(ul)t*b)m s up a flight of stairs 10.0-m pkqc 6vt+ jk ,lr)( 4.m*dlo u)bn.uwkhigh, 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 velocitp:3z sm/p0nwu:; b bfuy of 5.0 m/s. What poweswfb3; :unbmzpup :/0r must be delivered 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 tha ;. c 6ta5; xkf hj;dlnvqz)uf;e3gp0mt runs for 1.0 hr? (1 hp = 746 n5.zfuj3dflh;et6gvmk )pq;;ca; x 0W)

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 whil n5dp 9*i6 (e lzoo.kchhb) dv:*ytr9re riding. How much force does her foot push with when shekr ie bl t*59dzhyhn6cv:p ()*d.o o9r 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 accelerate( ewz(hb5ocm7 s from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (e7h w(zm(5boc 1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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