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

1#

What is the correct unit of i9g , b3m-cz3mz4hotq work 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 c2d)1y m2b1yb(cxonp if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wa4hs. bn uk(nl:ll, the amount of work yo:n su lnh(.4bku 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 liftedgs;z6c4y0re mo.h iui2z :x 1d 2.0 m vertically and is being held there. How much work is being done in holding the box in thiszru1iih;zxe s .ocy d402gm 6: 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 horizon,ot wc7itird4.h5- bd m 3tnz3tally forward at a constant velocity carrying a 10-N object, the amount of work ow-d nt.4z3 bt5ii,3h7rdmctyou 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 hb8.d,d)m yrhou-5a glifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work wasug.bha oh5ddmy r)- ,8 done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an obj vyp1pct /(ytuw0k;)5s z.vdnect 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 by ,jrvyc ake1bx4z36m 1 gravity while the ball goe xeavy11j4m rck63b,zs 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) gravb/3jl1/oj2m kwt 3sk 8.b0xud zdsq+ph, representsob2x0+/1/ 8dq dvsw3jb mluk s.k tzj3

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 rep(ruo.1g8 iog n):1 ly 4oukbnaresents the work done by tggy. 1baonl(8ri: kn4ouou)1he force 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 anr:w rcoco +uq+177cfqi9/x trvl f12r object 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 is negative, then the object's kinetic energg,;f ,vlszovws)n .;j y

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 yrm o, l:vw * yn593r3eds9 y/blouc9dzero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and 7jivwj ) b2d9+l0o dp(4jwzw pis moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to twpw2j4dizv9l0opjj7d w) +b (hat 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 tu*dk pnu0- :cahe mass of car K. The kinetic energy of car J, comuu:-n*pc dk0a pared 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 rn33 z a 9casjw(hb( 9ybr,lny.qu47sof its original speed. What is the ratio of the final kinetic energy to the initir3 7u9,bnb.rha 4slsnyyq( az(c9j w 3al 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 at a spee0 q0xvl:n-s)e:b x wdfd of 5 m/s. If bo:w l- qs)0dx:en 0bfvxth objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg m ls +fhp9jhfq0h08n6cass is moving with speed 4.0 0hfcqp960 +n h js8hflm/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, andpwuci mu44mu3x3s3-6 t-k +/v l b er-x3akwje skid a certain distance on a s4kuctm x+vr a33w k3 --w m-/uibpeu46exj 3lstraight, 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 orbits the Sun in an elliptical orbit.zq)lloadz; +g( vqw 6 degc5s*3i ;l-y Neglecting any friction effects, what happens to the planet's kinetic energy5;ce(q3 ;ads)i wgl*lg o+dqz z l-v6y?

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 principl5cgh1bz.uv t +e.

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 t phija9k3eh1t0 *i b34woj;vdo have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. n ur -wuwgqo(e*d t74t cx..2o A second object with four times the mass of t2od4w .*-gcenq.w(uo7 trux 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 attachem )5l2+d a 9uvcnwly2dd to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, td52n )lcdyum wa+ l92vhe potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of ak/q7;waw j0dp+mz.;yf n .bn i 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.r*)9(h ; zfyggoex -fd Compare its kinetic energy K, to its potential energy rffgdzo-*) g9 x;yeh(U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a ca-:h xaz1vz lpkvrkm: w 3mb6bcm*1 .)kr 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 andyk u03: )uee,md m-stz a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater heiguee :,d-tmy3sk0 muz)ht?

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 nirt)j.bawna* a ;ly6 k1 2+b8:onzjk$m_{1}$ 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 f 97t hkf;6sa5 z nzqhi0aave7d dy32o:or conservative forces.: oz a63s;nazkei 9dty507q 72vd afhh

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 presen4g;q 9adbr7xnt), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential9r7;n4bd axq g energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. /ujcoibwrs +8. )hkn4 Do not ignore air resistancenib/4+8rj su)hoc .w k. 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 loses4iaak,t ::y dq 30 J of gravitational potential energy. Do not ignore air resistan4 aky ti:q:ad,ce. How much 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 conservv c+.q dutk8:tation 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 isb (r:,gf2rtzg 6x 9kmmxtlf1+

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 insao 5f kci*d vx t.y(6cn7+a(q 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, whichcpouzmvj74:xnm)qzx8 q+pz-gh : : f1 is not a 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 ylwf0 gmr 3.tbp* /8dtthe time. To do so, your power output mwb8/tpr0 *gmfdty . l3ust 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, the3h7fyeque; w0 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 objecz iqq13p+2 )sb .hi uig;m;bait weighs 90 N, h gqz3bh 2s)i1p+.;um ai b;iqiow 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 1.0 m, -zwaxj2.ciie3e( vk/;irg2m4 a2f(u fai2 iy at a constant veloc-mr(z22 ;/v4 awiuce.x i(i i2igfaajkfy 32eity 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 omvcc ftmt kcd8/o. qedk4jr09y9 8( :ci*nl4orce of 5500 N for a distance of 50.0 m. What is the work do*cmt k:9ccm tj0c44v(r. i oo/ly8kfqd8dn9ene by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a disth2bu7s/+dr(/ q ee yjkance of 50.0 m. What is the wor/syj 2+/eb7q h(rde ukk 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 pullv:m v2 j o+-cfklvz3/ued upward with a constant force of 5500 N for a distancek /2:vju-zvv+molf3c of 50.0 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 along a fgea c: ob rz6s+cts9cxjn;d,6 a0 +/y$37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined ke :zfl/7nm 1bat $30^{\circ}$ 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 sisfk8ml ir.cg 1*ter Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an cf1g.l* 8kmri 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 di fsh0oa*qq j1n,tvu a ./zcx:7rection of the force. The graph in Fig. 6-1 shows the force ve*/j.x,hqt 7cn1qufz:sa a 0vo rsus 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 /0qtod*3 0c8ofvyoz l;b n9s:wwbk p. in Fig. 6-1 shows the force versus the objectdn;f/o.qo tcowsw9:p l003 zb8*bvky'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 th0; s-e0 :6brsumlgdi loqc)rq u60u4je force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to j:sq;ui06 )0mo0ulserg 4c6q- rdubl6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the forc.zvlh7.uhwnh/ k d4.ye. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from.uy wdkh/hl7vz4 .nh. 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 9gv6n aa weny17) ns:y0teh,g0ng;a x55-kg cart (initially at rest) across a 10 mvyst 1n g,h 7 a:nagx;g00)eweny a69n level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N islz z6j3h v2v; ogl:/bx applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the fiz :o/h6v z 2;lb3gljxvnal speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required h8q5cwbo +l i,9jv,tw2 cn3e oto stop the mase,wb5lvq 2ci+ w8no9 3jh,ctos?

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 distance ir;eqkg .g q)md5q8w3qmiso/ 7v rf3h.s required to stop a car msd5; .q87q)g.g r 3/qmrmieh 3oqkfv woving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is xvn (9p5.r(l tv)jmdi(53uer ntvc ;wcocked 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 negligible mas)n.xr(evlvdupt5wm r(3v c 9 itnj5;(s?

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 oa(, 4h072 eg/oq *ubzelswp evoa ke,)f 80 N and a vertical component of 60 N. The force is appliedw 2el ,0(zeesa*uv q4he,pak7b) o/og 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 shot4b5kgo k.(v)h6 vnh 8 qr1pbbvx9c7qw horizontally into a bale of hay, striking the hay with a velocity of 60k89 1 5bq h4. vopgxvb(6v7nk)qhwrcb m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to a gtwo okltl /spf*ahp9*g6)i1aqp5 s92* mg,c height of 13.0 m above the floor. What is ap*w92/ift1qpmslk6 5 oggcps *hg,* )tlo a9the 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 pt ow*(lg *is;flane. The plane is 4.0 m long and rises 2.0 m. If (o fi;*sw*lgtthe plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. Wg3 ; pzv(y bu+b7eky6fhat is the spring constanu v gey(bkyp6zb37+;ft?

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 ,g2nd/ a /gqs n0 :thl9;+1fegakumg bof 60 N/m. How much potential energy does it store, when str ge:gk/ m1d/nht +su,nf2gab9gl0q; a etched 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 compress an initially uncompres yt;l lo.)0sojsed spring with a spring constant of 25 Noy)sjl;lto 0./m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m from x = 0 hm-9okl:7vyik23xniu zkhr:6zrl- *.20 m to 0.25 m? (Assume the unstretched positi ku 7lhi9l :vrikz-6mh3: y2 *-onkzrxon 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 ofv us d3e3d57z -hoay(j 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additiona ajz33( 5ysdhv-7d eoul 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 of a 5ym3 pf v/ :o.c/ puz gctfm-.;tqz0r/q0-m high slope. What is the speed of the ski/ tfy/ om 0vzpm/3qup;cfz t. .q:-crger on reaching 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 kg, pushes off the top of a hill with an initial speed of 4kr;e l5zye1g) bsyn) /.0 m/s. Neglectinr)ky)ng1z l/ e5 ;ebsyg friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionly fh)+7wr.i v,* l6o)wkgcyepess inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the 7)k.g+ph r),vy f6o *iwlcwyevertical 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 above the f ba/5;sjejj8je h c.p6loor, its potential energy exactly equals its kinetic energy. How fasj8a;.jbps jjeh5 /e6ct 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, bla q8l-hklpw0.k sts straight up from ground level with a kinetic energy of 4 khkw.0p-l l8q0 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground wioro/ (yu(gak(+ob, 8k srqfu 2th a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy sq(r((8yo/okr u 2k abof+gu,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 p/mguwwm9) x l6urp,v1zua 8. u8j y+m45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the r ,vpwzum.j1 9 ugwmp+mr6u 8 yl/8x)auoller 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 ms r)m44 jw;maawah/u5 above the bottom of a dip (See Fig. 6-2). Neglect frictam/4r mww)5 jau; h4saion, 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 starv hhi3o.x+4ndj- d -5b:cjbbq ki- . (ekhlln)ts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller.ndxlchj4lkb.hid) nb-o5ve+jk - q3 b(-:h i 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 of3ptkug)k w mug5/om 9: the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.13(q.u zq8s+rgu m away from the vertical axis and released from rest. What will be its speed at the bottom of i .uqsu r+8(zqgts swing?

A. 0.1742 m/s

B. 0.464 m/s

C. 0.697 m/s

D. 0.581 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 uncompressed uu hc*qngvo6b6gf4-;horizontal spring wc-6fu g qgn;oh* 6vb4uith spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/,b /d ix+q38b5cypnljs, slows down her 2000 kg car to stop for a red light. What work is done by the friction jb p3,dc/ b+ln8xyq5iforce 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 horl 9)j xens*-dwwcjlaeo7l78 + izontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to an7 w d-)jexlcs8l9l *jwo+7ea 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 kinetic ej: tj, knnd)3y;(1xnmei5r jinergy. The friction force on j3,m; t5rd 1:e(jni yx) kinjnit 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 applieh5(0r 2o ,owpe y-k8k b4lcfxpd horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic fricyr e 8l,xo0cokfp2b wpk-(h45tion 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 frotuj*4fgot zf0.lz. c etj2 9/xm rest from the top of a 50-m high slope. If the work done by friction is 4g lztjt*fo zj0cxe9uft2./. $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long 67mdc vxgpnjr*2 z2i 6and rises 2.0 m. It requires 3200 J ofr* j26cv7 n2izm6gdpx work to get the box 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 20enstcio;f uw,901y 9ra above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will 0o ,fr99 a1ticw ysun;be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and s rshw-8m3 .j.k)zs8umhxqhw:0 4zmwftrikes the ground with a velocity of 7.00 m/s. What as3-m.zh88)x0u4h .qzwh rkj :fsmw w mverage force 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.v4d:x b5afq a he runs up a flight of stairs 10.0-m.d xa:qab4v f5 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 an obi zukt f9,dicf 1z 359naekn1;ject with a constant velocity of 5.0 m/s. What power e31, 9n u9zkd1t ifiza;fknc5must 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 energ/6ka r+i*lzm ty are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746m6itlkr*z +/a 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 wx n eu-tl- ,m,x;otn3yhile riding. How much force does her foot push with when she is traveling at 8.0nlxnu,et3 ,o- -xy mt; 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 acceler e- yiyvy*ov(9ates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hyv9ieyo-*yv( p = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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