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

1#

What is the correct unit of work expressed in SI unw 5zpgv,ma0:h its?

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 izv3uo4h6lodwq ra z -3ez ,.)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 ybo+tza5yzyn6d uk5 o50. d j:jou + da:0uzooty565nkyj5.jdbz do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How mub+l u/es.t)p,b i*hk-y: xiwqch work is,/ysp:.e-bw hi+tib *kq) uxl 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 horizontally forward at a constant velocita)brg+omi8r 3fl nk7 n1t4tc,y carrying a 10-N object, the amount of wor8moti3n) 4, tfka1+ rg rncbl7k you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to itqd2 0us1mcm*as original position. If the total weight is 30 N,* m 2cqs01adum how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force actin3v qhf1sf)s- 4ukuul( g 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 straj5ethrqrw-e :.a eph*e2eu02 ight up. Compare the sign of the work done by gravity while the ball goes up wiqe0eej:r2ph.5u2 tae r ewh-*th 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,6dtt: 6y1ue6v:dfv e t on a Force versus position (F vs. x) graph, representsydd6e v6e1ttf: 6:tuv

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), whafb9i3ie3+r et t represents the work done by the3t9ee+ ribi3 f 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 an object isw nd/gnk18y qqqd841k 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 iriges3fi3oymp5 iu 4(s, 3 p6zs negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on 8 xwuffx/3:+hzvk )vrch8cj; an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is mgjc30; x. rzlv-y;jcz oving at twice the speed of the car.zl cx3; ;g0vjyjrc z-. Which statement is true about the truck'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 the mass of car K. :n; voel8ut 0d The kinetic energy of car 0;lv:dt8u o neJ, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half bfa:l l(s6)xh of its original speed. What is the ratio of the final kineflh)ax 6:b( lstic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving 5ffapa -cb9yz a2-vu8 at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's masscyaf-- apaf8b2z5 v9 u?

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. Apf0 /ev mydiv;c8k/s am gu06wl/;0w f 1.0-kg mass is moving with speed 4.0 m/s. Bowmiek0aw/f vup0y v /;06gf 8l c/sd;mth 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 ob 2)j:w*h tjg:ylh6 ovf your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?t6 gl2*jbw::vh ho)j y

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 theoex7* g /smj;g Sun in an elliptical orbit. Neglecting any friction effects, g7jeosx; g/*m what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle.5cc8ly gpf5n 9

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 to7 jmvw :yn 8g) -phclo-0od2rw 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 *5 eycf l4n;ww5aiq1 tthe ground. A second object with four times the mass of the first if released from the same heiwi15ac*;l y4wq fe5tnght. 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 o s8vq57p wh,r )vzkbk5tn.at)wh7n /)(qrfsu f a spring causes it to stretch 5.0 cm. If hw5)kfq (vbt7npt7 s ) rshwkq uazv).n58 /r,another 0.200-kg mass is added to the spring, 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 energp 4: yj,gq/ihcy 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 cve8 6wim16 mp mv wj;9,h eb;ih1z7rskinetic energy K, to its potential energyz7ih,j 1hmecv 9vwpmmb6w6;rsei;18 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 car driving up a hm6h7rn71w6xns k 3cdc 3x5uxoill.

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 :xg7vvlyko+.cvt/ ;y2e wb2cheavy object are sliding with equal speeds along axv otly;2.7 vy2 bgcv:cw/ek + level frictionless surface. 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 b tbxb5imzyv,2 ,i)0l9pj- ze$m_{1}$ 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 ofcjzp lf:vkm8xh5px .q u7li9w ((yt+2 mechanical energy for conservative forces.f+9t2ivlj (kq5xpy:c.h8m(puwzx l7

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 buildm dz 4wnr19k0qing, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U)qrdm09 w4 znk1 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. Do not ignswn+v6ekz 0 kzi z6m8;ore air resk kzz60emn+6v ;s8z iwistance. How much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of ga l53 uzbih5/k0cbmwib2y4* wy nn +a1ravitational potential energy. Do not ilbc5zm* bn/nay2 iku14+3b5iwway h 0gnore air resistance. 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 conservation of energ+b5w3m -x0gw tn c gnityz(i;6y.

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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 isnl,y o d b)jtg lfi;1u10(q2cst,1glt

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unx)b b( chk ,;ch na,cyfo,38rvits?

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, whal elz c/ (nobl5r2*5 oz-;, fhvxvvv*ich 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 woiox;*p06nk kc rk in one-third the time. To do so, your power ounik*k;xp co06 tput 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 ca(i5sizvm1 mfy2x)g3 a dn1ac)r'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.x) ariq3r.i i0sepv2 *0 m and held there. If the object weighs 90 N, x ri p02ve asi*q.ri)3how 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, at a constant uxi h9b) mtqcu7wz(49:bain 7/x wbd-velocity of 0.50 m/s. What is the work done by the w(b-xu7 haq:ux9 /ztdnib7i) mw9 bwc4eight 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 3hzj icz4zzsupkqc-/u-f 2 cin1k ro7/* d35va constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N1zi3 p 3-nzf/ci*qz4 2 7ohud-5krj/kvc sczu 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 *+6zucl keo.u a constant force of 5500 N for a distance of 50.0 m. What is the work done by the +euzoc *. 6uklweight 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 pulled upward with a constant force of uh2ycvs,1aer4lgf fm /*u *3h 5xn2nf . hvmh85500 N for a distance of 505am3.x h2s 1yu v4e*nrfvhu/ , nf2 hh8*lgfcm.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 pulled7 +gzriww p9 3w-u0fakpr 5gt+ 6.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down lvgj5z:w:fyc:0 s cp1egj 58pa 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 si7au;djl 6 b)/.qi +9hwa*tyzz)*dhwstzymo 9ster Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N ad z b9zt ys +.7h)iyu9w)/ t;wamzohl6**jdqat 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 grwq-j 4ha f:j yc4 8pq nsjc*-lg5rn77daph in Fig. 6-1 shows the force versus the object's position.sn:y n5-jdj-hcl 8wa7qq47* rj4gc pf 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 e1miy7c/mba02wgkc2 the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thc k7 ayciwb1m/02 m2ege 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 objee h mj/db9o1pqo1+qw0tm+mh1 ct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wwoh1m9dqb +o0 q mp1h j+t/em1hen 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 direction of the force. The graph in Fig. 6-1 nb3;b tti iu8(shows the force versus the object's posiu tb8n ii3(;bttion. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at rz rjh8jgtoncv2v+lry +2x 15 2est) across a 10 m level surface. What8hjrxjv zg2 c+1rt22yv 5+l on 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 is applied to move a 1h zkdef 7mk y5.(2tgd55-kg cart (initially at rest) yzh 25.femdgtkk 1(7dacross 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 moving with a, t t pt* s9yh dzj78o)chq/ve.urn,)c speed of 5.0 m/s. How much work is required to stop the mn.scut,/7j t) doth)v y*8 erz9cqhp,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 oek-g jkx*, y/a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under thj e/xgy ,-*koke 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 cockeptqi1 - +hzfa;d by exerting a force of 20 N over a1qti;+pah f z- distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and t0)n 7txuco6uxbl .*ta vertical component of 60 N. The force is applied to a box which 7tt)x*6 xcu 0tu.nobl 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.d+-z6 p:fl3g(f wpum(sj-z 1 djwarh is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whatdsf.+m-( frp :pd1w3 g h -za(jl6zujw 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 mo5rl4y4wdy cy5c o3k: 3isqzl :ved from a height of 7.00 m above a floor to a height of 134l5:oqd r: 3c4y3yswiyzk l5c.0 m above the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up zwwu5h1e 2lb5 ();q3,crgjd 3gsn evo an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the o51qe w ,geb vz(nh;2u)w3crj sld53 gplane 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 streu +i gyp+na8-7vi xx8qtch 2.0 cm. What is the spriaq+x-nix7iu8gpv 8 y +ng 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. Ho5 5;ncbmz(pm.mvs(fg c* rc:vw much potential energy does it store, when stretche((g5 n mf cvzc.*:vrscbmm5;pd 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 jn2t9fmspluy-oy7 w)xm*- a;5hsu ns(py*+hcompress an initially uncompressed spring with a spring constant of 25+m(*u)*mss;7lppf nnh2yh5ty w 9s-jo ua -xy 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 spring constant 40 N/m from;va kp knj 4cm6b.gt810;cehzjqby(( ic 0 w(s x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.(bb40 z jcc svta ey1g0k (jm.8n( q6;ic;hwpk)

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 :bw3d3hfgj jf q pi( k:5+iap6rbnh. +is initially compressed by 3.0 cm. How much whpai q +d3hi3n.(k 6brpj5+ f w::jfbgork is required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest ky, ja)m2c( m j3,cyzqfrom the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (,,z 3yjcj kc)2qmya(m Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hillu9dbim6g jy ;2 with an initial speed of 4.0 m/s. Neglecting friction, how fast will y u9mdj;i26bg 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 inc-wcjrnh g/c;0omsamc;f::1d +z t kb2 lined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?1co+ht mzfsjcbr-;d:; ak n02m wgc:/

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, itkpdj8ea(/(e;cste. ps potential energy exactly equals its kintpep (ed jk8 .c;s(ae/etic 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 fropi 96* vcr0axom ground level with a kinetic energy of 40 J. At the exact top of its tr i6v*9p0caoxr ajectory, 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 with a kinetic energy of 220 J. At tc4y j hqd4.( mwmoz;0the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its lauy;m q4h0o(4t.wj zm cdnch 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;* kvyfw )4glwwxm v*zc:o /h9 a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above to*khf4w cv):y/ ;w9 mz *glwxvhe 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 po h8gvqox0l6 h.q :+llqint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will beohql+8h6 l:q 0.lqgvx the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with hl79tnv zftjd*x a/:)a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coas)v7 *jdxfttanz/l h:9ter 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 bosqp3 4a733koqu q m7fsttom 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 pendulum of length 50 cm is pulled 30 c5zgbnre3o.e ek3g4 l5i.,b dmkt :oi /ms-5 yxm away from the vertical axis and released from rest. What will be its 4/ezk.nee53b 5 ts dbo,g lx3mi:-rmi5kgo.y speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initia ,x m7b:sph- u2ademx7lly uncompressed horizontal spring with spring c7- m 2m:puh7s, badxexonstant 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 atl1qv x8 w ;gdo0*uklh0 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force agains8g u;h*w1lo0l0 x kvqdt the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surface isn;-lhlb.7,i 2yi gh im 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coibgii;l-lyh2,m n .7hming 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 mo r7jc7lzh j f)rrcro-/itcj)67x:/ +pj pc g1mving on a rough, level surface. It has 24 J of kinetic energy. The friction force on ithx/p 1p)c :-j rc)jzj/ m c+jr7f7gr67iolrct is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to ah0rg5ljw5 u q: 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved05jq:g 5 luwrh 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 dg aavvqrxo)w(d,2ovlr +9 45rone bqro 5(r4w 92dv, aa)glv+r oxvy friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and rises *+dc0mrg) lnqy )rz;(xvk g0-gls)m7xkx dv 52.0 m. It requires 3200 J of work to get the box to the*nvd)0qcx(0)m)dll 7z xg ggvs;+kk-rxmy 5r 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 at7 p*nex *v*fzwsh 77ka the top of a plane inclined 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 4pkshn77e z7vxf *a*w *.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 fr,l,pe-ww7dlubkms/.v r; 5u x om a height of 10.0 m, and strikes the ground with a-urkds e5w lpu,,vm/b7w;.x l velocity of 7.00 m/s. What average 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 60.0j xbl-eo9h2u g4i;tynn6l v( s.k ov85-kg boy using energy when he runs up a flight of stairs 10ngl os 8bh9neo5-tx4vku2v .jl (i;6y.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. W+2hdnj0 at.(ifh10 dv h-b+8nouwynwhat power must be deliveru -8af h.nn2j hb +vthnwi(0d+1y0odwed 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 apeo-j5m k.gs:(udo(p 1.0 hp motor that runs for 1.0 hr? (1 hp = 746. s-j:ek5(mpdoo (pug 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 rat7 ,dccbi*w9 9 qjhii6le of 500 W while riding. How much force does her foot push with when she is traveljdwl9, qci *7ciihb96 ing 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 fro ky:u qd1v/./ox1cdhw 21epi1zxpt a-m 0 to 25 m/s in 7.0 s. What is the average power dx:./co/p wepq1i-dkya211u1 hvxd tzelivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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