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

1#

What is the correct unit of work expressed +74+t usvjr,k(m4z5effr.hiax .mmcin 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 systei)e (:mlpq xj2m if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of work u 6/d3q0 getvqyouq 60 /3gqtvdeu 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 lidgeym0 i c) kmv5nd844fted 2.0 m vertically and is being held there. How much work)myidv 0454ngm kedc 8 is being done in holding the box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m ho *j.ccp*elro mb9onm-b q9+b 1ggl) g2rizontally forward at a constant velocity carrying a 10-N object, the amountgrgc -.* bgb 219o*9o)lj+nepbqlmcm of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned ta 5gzd-; xygu5fn 2ks8o its original position. If the total weight is 30 N, how much work was d; - u5ny5agg2dzxsf k8one?

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 mldi g r,ya-f, 6suoyy,*/jsk,:h p m6acting on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done 3 m ke/t 8bbopib6.ba0dyl ;)ot6-dk gby gravity while the ball goes up with the sign of the wbi6kb;0d -m y)b gk8lto6b dep/a.o3tork 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,o3r:wt sct rs5m4(o0 bvmn;r a Force versus position (F vs. x) graph, represents,otctrsbmw s;m 0onr5: vr(34

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), ru3:q27o3/co m 4akqam az-yjwhat represents the work done by the a joyz cq42r73m3 -omau:k/ qaforce 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 posi28td)bi 0 ymzttive, 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 xgyu.i7;lp-v object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, the*wxk grpoh56w ha n0 dk,,k)j4n 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(u act-fj 2. ze8y6ly1 kcwmi; is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car?flwkz juy -16t8i(yc. 2cem ;a

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 the mass of car K. )v 8:d1vgnbl uowbp8;gm) r;l The kinetic energy of car J, compared to car K i : 1;l)vb)dr mpuvw8;o g8nlgbs

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 saa9+odi+ow12m0 -ka-pm;xp 0n qjjbapeed. What is the ratio of the final kinetic energy to the inix m+ j 0da2ikb;+oj10onppwaaa-m -q 9tial 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 movinp8u7f vvwc apb);8 :zzg at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brickbza u cv )z;8v:f8pwp7'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 mass5vjnc5c.8bo y is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are5o8jcc bv.5y n 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 zdoi6pt,f* 2 naaiw 24distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the si,4p2aan6 *zfdtiwo2 ame 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 orbit;0o dkx iiz3fnyr+jvyn x. /7n lx0c8*s the Sun in an elliptical orbit. Neglecting any friction effects, what happens to thx jxi/* .8;v nco30n0ilyzdknxy +r 7fe 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 pri0gqnxg1 k om:ye g;0el)b 2eu8nciple.

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 pop63*a qp4u ;81 ah0lbmzsudgytential 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. A settg92(-mue ha cond object with t t guhm9e(a-2four times the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm5. oxgwq5f1t z. If another 0.200-kg mass is added to the springg5 .t5 qo1fzxw, the 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 enmizqzs( 1x +.jergy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to x la*62fjd7 s0ogs2nnits potential energy U62x 0lnds*2jfo asgn 7.

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 a0mr*q-e d 8k; a4s,d ov:ue(nsj6z tjj car 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 eqpv )w *-b1 c-la)usq,fztbe) yual speeds along a level frictionless surface. Theys-- bqc,a)l *weyfvpb)z1t) u 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 lk8m6 do mptly4n1 m*.uxzb-0$m_{1}$ 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 forcesya. 8s 1q0rx1zs idc,iucq4 4q.zsi dqy qca8r44sc0x ,uq1i1 .

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 (aixiz p 2)9cvpp-jn.tj.*d zw,kr friction is present), to the ground below9pwppn*v)zcx .jd.,tz i2 - kj. How 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 disteomt cd;8 7e job/y)/vance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitatioe eooj;)/my 8t7vdb /cnal 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 gravitational potential ene3jj9inw ( drfl;u 0b.uqml-3- xknd g+rgy. Do not ignore air resistance. How much kinetic energy did the bal (-kjnug l3 lw;3-0 dnxmbq.+fu9djril 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 kk*c*0lxzpnco5p89 /ds2aku jl ;d -gof 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 is*qhld 0pk2,zp*8lep*6c z 1x jbhr c4wfp0ye :

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 ov/pou7t ur ;i,j,8yj/ f-zyjpower 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 ussyqmj3 7; wdjr(;ld9 nit 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 didsde4*hn k. 2ua 3 times the work in one-third the time. To do so, your h4u2ea.k*n ds 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 accelerationv)6i yb 3.lhva, 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 vertil+n2kih.q6yy3b1 d lgcally 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting ign.kdl ih 2 +l3q6byy1t?

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, atc5 rn6zr r2w;bjbh vyf;.:bc: a constant velocity of 0.50 m/sr ;cc:hrj:rbv n zbw.2y; 56bf. 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 force of 5500 N for a dy/kmnv8yo 6,-qc;j:xj d oeh /istance of 50.0 m. What is d :o; nx h 6jycv/8qek/o,m-jythe 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 upway 7+;(b-*lxpoq i( z7uwihjc urd with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevx;blh+(pc(z uj-woiuqy7* 7iator?

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 force of 5500 N for a distmlob5wyl0h++dw/ 9 wpance of 50.0 m. What is the net work done on the elevato bwo0l w5p/mdy++wl9 hr?

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 h ov3qnzb9hd)-s8 6 ff$37^{\circ}$ 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 :htswl+ *xy u*a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surfaj3w n id+3f8kvni wa)0ce (assume no friction), with a force of 60.0 N at an angle of303)iw dwnakvi+8 jnf $37^{\circ}$ 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 direct+y zmi )8 6l9 ;n*dgqkjxn :rly2+qeulion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the wor r*ln9gidjqlzxqu ml )2ye:6;k+y 8n+k 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 q/q0gb) -w6a,ita4b0jtz w hgdirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find tzq6w4 / qtbj,g 0)w0aat ibh-ghe 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 objecy b650 h7vdgbgt in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves g 57d60ghbybvfrom 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. doi x-b598zm -pkp*fxg */fec6-1 shows the force versus the object's position. Find the work done when the object moves from gz8dx - ffp -*x5e*kpbocm9i/ 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 (initially at r+ebas,j h36b5b ar34z as+g 3bz h f7wd;hol/rest) across a 10 m level surface. What is the final kinetic energy of th;asb b 5 hlzbe3o7bahw,agdr+/+334zfshj6 re 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 move a 55-kg cart (initially at resdt zhl i:x1lfa.w 2o/2t) across a 10 m level surface. What is the final speed of the cart?xf ll td a22:.1iho/zw

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 witb3ili9sr)o tu;6kv +obmu8c, h a speed of 5.0 m/s. How much work is required to stop s +;komio b8)iulv39c6btur ,the mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance mxi e75(lhvf*rb/ b7nis required to stop a car /f (irl77b*v5enmbxh moving 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 kd+ij2 9yeejxb ; ua/0propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wi0 ei;2dujyj b+ax9ke/ll the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a ve zuh76sc+*:5kxt8 x mjy7q4k)fky eaby0f h3crtical component of 60 N. The force is applied to a box whkm: a 7 7k4bk x6yf8+tf3 ce)yh*jxycu0zqh5sich 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 balemq :e rx7 oblay-4mw/6 of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the averag- :bml/7owr4x e6myq ae 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 height ofws6b7lf 3jg39u b9 azl 13.0 m a u7b flbw 6g339l9zjasbove the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane0;+bnmz*r0q (nxjyk h is 4.0 m long and rises 2.0 m. If the plane is frict kr *0nzq (bh0+;mjynxionless, 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. What t;50u( g8cwtetdi 4)gz/gclg is the spr ul5tgggcg)4wdte8ti (; z/0 cing constant?

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 60 N/m. How much pmac6m,)l )ndb) fb9 ttotential energy does it store, when stretched),m lb ma)69bdtcnf t) 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 kt:do/(h1)tr ghvd x5to compress an initially uncompressed spring with a spring constant ohrv 5kd t)d:(t/g hx1of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spye )k/d,afqb :s i0f5pring constant 40 N/m from x = 0.20 m to 0.25 m? (Assuf:s,5 dpfqae) b ki0y/me the 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 compressetu aoza :8)y (0jba8lcd by 3.0 cm. How much work is requiro) cjt ylau(:0a8b 8azed 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 fr+62,f,wifdjpqvsp3 o (,nyqrom rest from the top of a 50-m high slope. What is the speed of the skier on reac+djf o q2 (3ywnvipp,fq 6r,,shing 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 ooclgx( 8 9ut7 (bga,nmf a hill with an initial speed of 4.0 m/s. Neglecting fricti,c b( 7oggtmn (uaxl98on, 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 frictionless inclined plane. At the bottom, it h,kr, oaox43ey as a speed of 9.80 m/s. What is the vertical height of the playo x,4,e kro3ane?

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. Whe )vi(osw* pp-iq1. is4ykmlhy/ 0wcn. n it is 0.70 m above the floor, its potential energy exactly equals its kineti0 i yp(1v*qwsh/4ls- mki iw..o)pnycc 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 wifd6 /6a( vkvo ud5ih2jth a kinetic energy of 40 J. At the exact top of its trajectory, its tou6vh2if va o6j5dd(/ktal mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220yx(pvvh-;q x t.y4s*o J. At the highest point oh;pv(xxs-vtq*y 4.y in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a dtpado.2bwr*( ;(pd s 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 nerow;d (.apt* (sbdd2 pxt 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 poid0ggpa7t 5ze gni6sv7tgz ,-5 nt 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollzs,-tg7e0d 5 5az6gigv7npt ger coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip0q vmcd)dn3g ))za8p+g0t( ski)s csp with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above tpd cg szsn0 ica8sv0m3qdk))()pt)g+ he 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 ballw 6e 5n v(a/hk)fy(9vj9b uvuy 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 lele rvkqd/ 3mk(7g (:ft2;jxlfngth 50 cm is pulled 0.21 m away from the vertical axis and released from rest. W t;qfl23(xvg kmr(jk 7/lfe: dhat will be its speed at the bottom of its swing?

A. 0.2856 m/s

B. 0.762 m/s

C. 1.142 m/s

D. 0.952 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 horizontal spri6onv h-jk* ceyz-p6, a6qf.w6uv;w cnng with spring constant--qckya .wcfj6e z,66nn;vh pv o6w*u 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,6tu z;) 1 nuiki39 w5-jaeucmy slows down her 2000 kg car to stop for a red lightcu53)9 ie 6ya;tu-zik1muwnj. What work 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 b(emox4xe 1l6 io8ynf8 etween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of thm6 of 8eex8lo nxy(i14e 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 surfac2k-dpounuz4xn- vt s+5y6o9 s e. It has 24 J of kinetic energy. The friction force on it is a constant kun -524p+sv96sy dun zto-xo0.50 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 it v 6v3xcv(c82.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the chanxt38vc 6v(cvi ge 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 slpc.b* (ayj+5 gxhh1apknd,l.ope. If the work done by fric5* (p. + jpcxb nkghd.,1hyaaltion 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 plane1bf t.qn/ zv4e. 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 the plane. What was the magnitude of the average nf/4t vbq1z.efriction 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 20e s6buv 0hyx:ephkr)g.0p* bd4above 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 4.0 m alobp)g*xr0h0: v6 buy.shkep4d ng 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 the grsfzhpii4t1 jl ys(87 ;ound with a velocity of 7.00 m/s. What average force of air friction acts on pzj1(s8hl;74fst iy iit as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of staixf-vxsmmx*w6nw gsxs/y0 /;j/ 67qv qrs 10.0-m hm-n/vs/s * j s7 yw6;60qmwxf q/gxvxxigh, 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 )f1 t9nvawy,bqz/ 0zh move an object with a constant velocity of 5.0 m/s. What power must be delivered ,9t0fzwy /v nab qz)h1to 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 16 .c1 4 ,ls9oly-carte fpxpf2.0 hp motor that runs for 1.0 hr? (1 hpf2cyp16sr9cf,oe-atpl 4 x.l = 746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How ucc6)/fh5opc yl/*s ( *cgtsvmuch force does her foot push with when shs5/fc c)tc*lsgc6ohyv * u (/pe 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 froq5cy+ h8eei 7 .gkh7 n7t-ntqsm 0 to 25 m/s in 7.0 s. What is the average power delivet7+yck5e n8 tgiq nh7s7 -h.qered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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