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

1#

What is the correct unit of work expressed in SI unitsw-u /* 6c6qmemrjsp8 ;jv h(gk?

A. $kg m/s^2$

B. $kg m^{2}/s$

C. $kg m^{2}/s^2$

D. $kg^2 m/s^2$

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there i u81b.cydszev18 3tcxs 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 agains0zk, yjhxz86bt a stationary brick wall, the amount of work you dz,6h0xkjbzy8 o

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. cby h0 l)i hvxb:.b.t6(0bf n1mujbh9 How much work is being done in holdib fhx10uhl)j6i9t: .0bbbm(by.c h vnng 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 velocity carrying -c sft /gxp 8ki76sp,ha 10-N object, the amount of work you do t7 ,g-p6 s8/cpikshx fis

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 7* mrpme98 iphm then returned to its original position. If the tpmp* 8he7r9imotal weight is 30 N, 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 acting on an object do work on the o2ogrp3r: a (r.+jtwf wbject?

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 gravit h4aeew;r 0/ety while the baee40tr;/ eahwll goes up with the sign of the work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vmnhk4)fjzp05 j7fr6 ls. x) graph, represents k4lfjf0r mh6 n7)5pzj

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 positiony1(efas ff ok2lq.1b, (F vs. x), what represents the work done by theo fb.s,q fea(f1l2k 1y 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 is positive, then the object's kinet 5tkdy)fz0hxqqj3 d:5ic 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, t 7wm;p8gva 9ffjdfwh-(lg9 u:hen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an o)xzq3 njz3f 88v9fou;gofb 1n bject 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 moving at twice the speed of the c3p(.o*oh fxua ar. Which statempafoh* 3(o.u xent 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 hasf 2ho;*qd3/;sr*ltnkj v +hic half the mass of car K. The kinetic energy of car J, comp/c s+i *2qh ;*rfnvk 3o;ljdhtared 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 o3h ew8bbo0pyc.bu9 u1f its original speed. What is the rat 03uyc phb.be1o8u 9bwio of the final kinetic 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 moving4 gczxdz*e/u2 at a speed of 5 m/s. If both objects have the same kinetic energ4/ec *2uzxz gdy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is mzkxvi1v,0gar2 sek/,oving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whic/xv ,s1kizva2k, ge 0rh 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 cervam079ht r d3a(-uv 5q3mza eatain distance on a straight, level road. If you had been traveling twice as fast, what dis3(- rtaea9azmqav50hd3u m v 7tance 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. Negldkkj/g7.s4u rx *jbw 3ecting any friction effects, what happens to the planet's kiner.*w /gu3 jdsbk7jk4xtic 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 princii sb7ek. f1/vmpk+ yw3ple.

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 potential energl1c 9joujpl ,e ++9va;;mqnke y?

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 heiiq4:q/x z30uu/;bkh,h miq fyght h above the ground. A second object with four times the mass of the first if released from the sa k/q ,qmxhqz3i/; :yfb0u4uhime 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 ( m8bpozy( v a+ rbdut;yw83 mz6fh33eto the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mazay(y6of 3mb8u8 dp+zt 3rh w;ev (m3bss 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 energy yfjh j b.1k7m.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 its potential v131f k7 pcpjmenergypc31pf7jkmv 1 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 drivige4 xw,pcj y6* o4t)me-vqgy ;ng 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 h m5ty99 fu4)xont ht6leavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to m ntyo5f96 4xuthl9 t)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 -qz/ nx-r xz)c$m_{1}$ 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 fwz*5n8 q.hwm q- pk(lforces.k.l-fzw5n p8 wqq*(mh

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 friy 4p2vz 5bn*qpction is present), to zpqp45yvb*2 nthe ground below. 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 distance and gad5ylpct5 mx 62ins 30 J of kinetic energy. Do not ignore air resistance. How much gravitational pym5c62 5ldxpt otential 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 h go;/e;15k uvrh 48xz*afl-zlm m; dland loses 30 J of gravitational potential energy. Do not ignore air resistance. How muchurdfve/h z- z;halg m1m5;lo x;8*4k l 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 energy:nqgm 09giy*u.

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 is5 q:*n y9/efu dvp2bpe/.tjm m

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 of7u ):9gqmlk0 hx7e b+t ghrp7u power expressed in SI units?

A. $kg m/s^2$

B. $kg m^{2}/s^2$

C. $kg m^{2}/s^3$

D. $kg^2 m/s^2$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is nbiov1xu kop;- so1m0,ot 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 ouuk2 n*ynu.)a,3g whhne-third the time. To do so, your pohw,2)g yu. 3nnuu hka*wer output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engegi ) h4-c uq:ddn**wo2ucl i:ine 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 txk7nq5zner 0a4x3)g/ tsdxg 4 he object weighs 90 N, how much work wa)e0 rtxxg s xqgndn 4az5/3k74s 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 aza*pd*l* zwqms/kul;)8*p o k constant velocity of 0.50 m/s. What is the work done by the weight of the p a q* k szmw*o*/lkp);*8luzdbook?

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+ h,5-mobooo *sh/fnk/ whr y0 for a distance of 50.0 m. What is the work donshnk,oo rf5mowh0h o+ yb /*/-e 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 upwar;zlr2u gn yg )j6*np-dd with a constant force of 5500 N for a distance of 50.0 m. What is the work done l gzd6gu2j*;ypr-nn)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 pulled upward with a constant for2; eleo)ukwlldk +(3 uce of 5500 N for a distance o2 wk(oleklul)+u ed3 ;f 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 hl z-- h *egm9:0vqm(5coewcqa $37^{\circ}$ 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 +wtwf-kjn t4: 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 surface (assvlvbp2 m2gn 23 c7p /tg9acq7jume no friction), with a force of 60.0 N at an alpngj/ac7v2vt c 3 m 2qpg297bngle 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 graph in Fik 8 ducjej6bjq8on. l205)zt zg. 6-1 shows the force versus the object's position. Find the w 5k dqjto08ljzej2bcn.z) 6u8ork 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 object45usg l k*ymeqyf64 .p in the direction of the force. The graph in Fig. 6-1 shows the force versus the objects.5q y6gye4lu*4pfk m'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 dc i/*/(oxj9wt vaxx4sirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fi/jwi4aoxsc9t *xv/x( nd the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the directionk ihbru u81r7. of the force. The graph in Fig. 6-1 shows the force versus the .ui8ukhbrr 17object's position. 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 /-*ef ccq.llj u9 p2czapplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is th9j.2lpe */l-czc ufq ce 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 55-kg ca:qa g8 ajg.ao wmhrrx35, -xk7 d5c4ryrt (initially at rest) across a 10 m level surface. What is the fdmx5:7a48jra.q- gohx, w ry5r3gak cinal 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 i 0:sg ev,g+,l rncuq)bs required to stop the massg)v +,rueb0q:g,n l cs?

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 is .pnnp qi,e1fy, w7 fo-required to stop a car moving at 50 m/s under the same condition?y o7 fq, ne.,i-w1pnpf

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 cocked by exerting r8dmc16m jv3ta force of 20 N over a distance of 5.0 cm. With what spee3m vtd6m 1r8jcd 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 Nwdq/d9ros rak0*f2e1 xc gxv8:-fol( and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally al- k x2d1* /q:arw(clef9od 08rxfgovsong the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, st8zt98 s:adnhx; ds1uc3-ec kn riking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arro9d ; :kszeasch8nu1x-tcnd 38w?

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 j ;pqg-ypap 2k(oqt62 height of 13.0 m above the floor. What is the change in gravitational potential energkgq-; t62a2yqpppo (j y?

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 plane is 4.0 m longmr x. 6:9ihwlzcgch8fdl .3,d and rises 2.0 m. If the plane is frictionless, how d8 : ch,x9hzwgi.rfmll3.d6 cmuch 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, causoz/.th c+txkndto0h dn676/ fes the spring to stretch 2.0 cm. What is the spring consta tottn .6 dc6fxok+nh0d/h7 z/nt?

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 constblt9 8ssd *2h8 3dkmaesa,0fbant of 60 N/m. How much potential ene,08 esd2 l8mbsa3 *kd tbhsaf9rgy does it store, when stretched 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 uncompressed spring wxuoxir*;w65 gith a spring * or;6g5iu wxxconstant of 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 spring constant 40 N/m fro ch / +ic.pwkpcd4me0:m x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = em. hc :id/c+kp0pc4w0.)

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 irgu,kx t2pqxsa 5op776 z0g3; pdms+zy npq *.s initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0pznxg 76k7spamz; o.t*q2sx0yqrp+,gp 53 d u 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 5g)pjcew, lf32,ph)ia.6;w p mnju4no 0-m high slope. What is the speed of the skier on reaching the bottom of the slope2h6w gpn3a,c;jw )inpmo,je.)4flp u? (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,wdsq o0jljy 9;0c2aqb(he-8d pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will- cyb;8( 0jd dw 9hq0aesq2loj 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 b c jf6/dm7-6hwo2 rewtottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?ht6 mj6 cw/f2wr7- edo

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.b uv/l3k+0fhe When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is3e ulv /fk+0hb 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 straightp8 exyj+pvhlg7 8f fsxuy3+: i.l)r*g up from ground level with a kinetic energy of 4+:x 3)j8.fgl*yu+ lr p7xsfypgv 8hie0 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 with a kinetic energy of 220 dx/4lidh .x s(J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical hx i4 l(.dhs/dxeight, 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 45 m abovex.gsm 7)e 8siln5n 23lkenjh: the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?7n5hnm 8l2 s:j3ne.l) ikxsg e

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 spee rqy+mgm m7t/bw 2,k cw bqc4*x5w11v+n u8xxdd of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect fricti2+xvnqu4t5 bm8cqm w7y +ww1*dk/rm,xg bcx1on, 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 starts at a point 30 m above the bottom of a dip with a+af(4e9nr+5f dm pe i cvp.po: speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of thefro vna mfp49(ceedp p.:i++5 next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (pointm 3u+-0 ,d8/bgrwscgllln6t jzn3v2c9kgy c 2

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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 cmr67ug.z/7d n6p2v 5 e wbxmwtd is pulled 0.24 m away from the vertical axis and released from rest. What will be its speed at the bottom /d ge6.rdxz 5v bw m726pwtnu7of its swing?

A. 0.329 m/s

B. 0.877 m/s

C. 1.316 m/s

D. 1.097 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed hor:wa ,xrrl8 vj(f/c jg90pqs;uizontal spring c:wx,fpu (jrag qr ;8v js/9l0with 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/s, slows down her 2000 kg car to stop for a red lighwkoc y9rod;c1sdi5) 4hmr ga*q(a7 b6 t. What work is done by the friction force against the whee;5wy6 1h4srqmcd 9)kag rcd 7oa bo(*ils?

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 sur r(9l gpg;/eykface is 50.0 N. If the initial spee;eg/yg(klp9 rd of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surfacef2m /3kl pv1, e*muul*tp8y mf. It has 24 J of kinetic energy. The friction8u2v *mm1ef*3p /kfy ,tpllum force on it 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 a 2.0-kg mass on a level surface. jdvll b8e:u3bf (,yfh ql1z 4+The co1j e+fyhlzlqb3f:4d uv(, lb8 efficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts frj/slmhmige 0c(/1 x 9wom rest from the top of a 50-m high slope. If the work done by friction m0jg(1/ixw9eh s /m clis $-6.0 \times 10^{3} \; J$, 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 and ris:4ds eeobwvhw6/iwfk10 o,f6u uv.p4 es 2.0 m. It reww 6dek4 f1si.,6 4vhb :0fowuoepu/vquires 3200 J of 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 o aqjpg(zzq1;r:;m -kv;bu 5vlf 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 4.0 mp;-:; lqa ; vgvu 1(zbzrqj5km 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 fromu9ktuey2dr9jxc0:h36l y /t pj6egh0 a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average fjl6ec6 gyp : 0yktu3/urd9jhh 0t x92eorce 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 he runs up a flight of stec /7sr6fc/,gtmyivm /dzz42airs 10.0-m hi7c g2zv/r/zdmm/ty c4i s6e,fgh, 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 ah4*l g;.rthlz *;h+ suhipq7dn object with a constant velocity of 5.0 m/s. What power must be delivered to th* dlh l ;pghtu4sh*hz7qi;r+.e object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hqzie0v jxut1 /t y9/m(r? (1 hp = 7ixy0 ttqmj//uvz91e (46 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 much force pmh wu8*xwiw4z5l+.2wjpv5 ydoes her foot push with when vu5y4h.+pim8pz ww* ww 2lxj5she 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 feco .ym/v mllo7a9 05wf0r 29rfh /nocrom 0 to 25 m/s in 7.0 s. What is the average power delivered by the en5mo fc2w9/yoav./9hn0el0r ol fm7 rc gine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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