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

1#

What is the correct unit of work expressed in SI uni n9s4mikg-+xrts?

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 iuund6orh+97-f rt ew6u .d, zcf 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 harzt(+u h)8- tcpfjj z6.yvyu2ud against a stationary brick wall, the amount of work you v-j26 +u).y u pc(tzzuhtjy8fdo

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 mucbsv42y/v8 lya h work is besvbvly/42y 8aing 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 velocity carrying a+2 k ps8hp-;*u 6m/ygfaqgjw z 10-N object, the amount of work yzmgwg kj p-/sup q+;f82ha* 6you 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 lixnpv sr-q:5l3fted vertically 3.0 m then returned to its original position. If the to-sv5p: 3lx nrqtal 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 forctz9 0.wa4, +awax 4edzwuu/qhe acting 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 by grabi6 u,3apk s3jvity while the ball goes up with the sig,3ajuspb3 6ikn 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 vi0 ;kh k6hbd8ss. x) graph, representsh68 k isdk0bh;

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 vsi1p6hmak z)qa a.p3 /4ejv *,xmuban7. x), what represents the work done by the force Fa3m.*xjmzpeika) 1u/n,647h qba p a v?

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)vhbi o68qaxbwa, kcoz09hn8fw ;8 b0, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinetic energy do2g3axvi p93f92iae

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the obu+ q 4hrjwor3gypr0:-ject'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 mup :7x+)q74mhqm k)xl lb:ugacch as a car, and is moving at twice the speed of the car. Which statement is true about the t k7)x+ c :mpxm74aq: qghllub)ruck'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 carsd+nc9x30.3nq +) gfy : gw,2nzpcc:vezp b vj J has half the mass of car K. The kinetic energy of car J, com:+vync gb q,cpz2 .x)n 9w3j z+cs:g3pv ned0fpared 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 w) cz*) bkbn*ly)agx3bounces back with half of its original speed. What is the ratio of the final kinetic ener)l xz) awkb )cynb3*g*gy 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 an0*isr6l / 0qttzrgp4ed a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the r4iqptsrtz le/0r6 0g*atio 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 cj;3uexx6 (t* etj ya01.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are axtx*e6 c3ejjty;(u0 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 certar5ar ay23aqsn7(k mi0in distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, unaanr s (0m kqay7r2i53der 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. Nercrrwjwf :6e/w /5z +eglecting any friction effects, what happens tj/ew+5erzc6f /r r:w wo 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 prqc+)yqhaxh(cnn8u j k/*d 23g ;ji5gj(oya/i inciple.

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 ener ,nd+jp0avq.d gy?

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 rq znhh)r1f*+ fx.eta8est a height h above the ground. A second object with four times the mass of the first if released from the same height. The pot 1f8htfx*.he+)ra znqential 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 ca 2 .lxteyt/ zr5+l8hux e;brv7uses it to stretch 5.0 cm. If another 0.200-kg bltryxt +2zl ;78vexre5/.uh 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 energy of a system2kg:kew 1v:q1diz:/4s ftyxqahii3 +

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 enen 1kun *08j8w hccl0nzr8z 0uk8*ccn1 wl0njhn gy 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 , 7c5b 0 6wl4p8s rxrds;zsx,gm .jhudcar 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 equaq)2b zlyjlh8dlnauwr 64)b*tg *2 n0yl speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a gre bru y)*njn zag40h8 6dyq t)2bl*w2llater 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 pb;8 w 6o zz r6lu)tqbdnsy+o)2egjw89*eo9c $m_{1}$ 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 force *q9e b*viask)n 0znv/thh(qh31 h)hk s snh a0/*vh*qi3 bhqz)( 1vnet kkhh9).

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is/f f+ liz*qf1s presenff+ iqs lf1/*zt), to the 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 gain3lwo0o j9(preqqn:i gqqj;3j a,1y0l s 30 J of kinetic energy. Do not ignore air resistance. How mu1jeglr a ; 3(l,0oo0jw 9 q:yqnqiqj3pch 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+af84 9j)7yqijbcv iwmt2 7ea gravitational potential energy. Do not ignore air resistance. H+)y2mv 7i8bw f4 icjataq j9e7ow 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 conservatiog/3w *a*k hq0 3vpccfwn of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is)iutplcz y.k,y gut +9/8sg,w

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 expres2.xfx.u -:0i ntcg aylsed 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 iv-g ;x5fia) e di9/smzs not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-thirdqs9 ,eh617 ux mxgpx6h the time. To do so, your power output mus6h 7g,9x smx hpe6x1uqt 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 ms u ;3 1nr6u)qcom 6o0creru;engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weighs: zxcp,yx c5:h kood77 90 N, how mu: :o5kcc7h ,yzdpo7x xch 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 distaj pvtxy,/1qkl9it swd*p93d37rsh-sr 4;jh k nce of 1.0 m, at a constant velocity199rsdkrst*xqlvsjk dpt j h/-h ;7w3y4 ,p3 i of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pullek- ab7s 2n(rb(izl)pld upward with a constant force of 5500 N for a distance of 50.0 m. What is t iabb 7zl(rs(-n2 l)pkhe 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 pullw87gpqi k*f.m jvwk7x3hw*f9 ed upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the8fxm.*w*h9f37vwkpi w7 kgjq 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 force of 5500 Nrk,vl,/5 kexz for a distance of 50.0 m. What is the net work done o ,k5/evlxkr,zn 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 m :ibgr9ds2zw 4ku2 j+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 a ramp, inclined aj(vo,q a+y 9ed41,xrzsnp b 3wt $30^{\circ}$ 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 (asc13/snaiy jhwh6qqgs3v a5,-sume no friction), with a force of 60.0 N at an angly1ah3ag,-h6n sqcv w3q5/is je 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 fy0o7tzeqx) 2b orce. The graph in Fig. 6-1 shows the force versus the object's position. Find the wor )0ozxt 2e7bqyk 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 inre8;:;b +uhps8r mikd the direction of the force. The graph in Fig. 6-1 shows the force versus the object' +se 8 8pdk;ibru:h;mrs position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. T/v,lttsn r d37he graph in Fig. 6-1 shows the for/ tsvlr,dn37tce versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an obj387 j:pqa oefrect 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 t8forje73: qpahe 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 c0nsh/g 8h,c mtart (initially at rest) across a 10 m level surface. What ihcsmt g/h80,ns 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 55-kg cart q/ fn u:ylcg;)q75pwp(initially at rest) across a 10 m level surface. What is the ; 7pfg 5:qp)/clwyn qufinal 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/svxnq:(m y.xnv6( q l,p. How much work is required to stop the ma6vql xvm. q,(n(:pyxnss?

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 ini,mzr).sfc ;gvtially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s undes v r,zc;.g)mfr the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a forcbe xf4nwps c9e8d30:kt5;qrue of 20 N over a distance of 5.0 cm. With what speed will the d:qf4508rx kdw3c 9sp ueenb;t art 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 vertical component of 647ld ya05b: i8ke wewc0 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the :y8 w5ec4ewabl0 id k7floor. 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 balem( jtq1m vl.slkfc00 ; of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whtjqll.mcs;k 0m1v(f 0 at is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m an/ hpo:3t- fjwsu89 dwbove a floor to a height of 13.0 m above the floor. What w:n9 u3p s jod8/tf-hwis 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. Thzb1nvzq5by; p p(5wwko a3 );he plane is 4.0 m long and rises 2.0 m. If the plane is frictw v;bkq;3haz(p 55bn1 w zpyo)ionless, 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 sp*mklu1 t:dn9 xit6q /ayuc1n 8ring to stretch 2.0 cm. What is the spri:qnc 1 *ainuy8k dxtumt61/9l 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 offf(;ty4j; mi l*x(;b qgar xlvxkh d bs2742;g 60 N/m. How much potential ene4(ji( v*s ff;y 24lx;;;dxbrlmq h2xbgtak 7grgy 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 requ1m3 t3:h vfprjired to compress an initially uncompressed spring with a spr3m:hj tr 1fpv3ing constant 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 stretj ,b4labuhe4fr )v1ov4u6 s/ ech a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x 446 oelueujf,vab h4sr1 vb)/= 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 inii.f1 p5 da;julx45 ukstially compressed by 3.0 cm. How much work is required to compress t fs4.pu5xd ;ajku15lihe 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 from the top of a 50-m high slope. What is the ffl9p k l )u8:;6;kzrne1ny2ev y.zztspeed of the skier on reaching the bottom of the slope? (neglect fr;yrl1y 6:uzeznzf2) ; n9pekk8 t.f vliction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a 3pul),ed kp3h hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moviu lpk3),dhe3 png 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 the1tv h 7wu8qe(k bottom, it has a spev1qtwheku (78 ed of 9.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor6+vztgz) 4 whkwl,2m e. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic en)ew2hmzv4kw+,t6gl z ergy. 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 nn 4i i7q-:4 l*2 tabf7lgta-jphora8N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanlaq*pf ha7log-a 8i:-t n4jrb7 ti24nical 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 grouno)*mrmx , q6(e8w8x 6 ztcuqkbd with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relatiqxxb8 *m(utq8,6c k6re owz )mve 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 above the bottom uv817 -(dtul iyh h,xnof a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top o,d(v 8-ylxhh tuuni17f the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bottol et 9z32ypfnr8wkist p x);0:m 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 diyfe:k38;npz 0trpl9)ixs w 2tp?

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 bofr-zh+jf(p 02autxs/ slo )f; ttom of a dip 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 mj/h-f02 o rl +u)stfx(azpf;s 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 ba0k0 s fjf :) no8u0yb1/aceoaall at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.13 m away from the 5 r tj12l;xewyvertical axis and released from rest. What will be itsx r e5t;j2w1yl speed at the bottom of its swing?

A. 0.1742 m/s

B. 0.464 m/s

C. 0.697 m/s

D. 0.581 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car movingjq 3g j2t)x:7i5qp puddh j+.i at 25 m/s hits an initially uncompressed horizontal spring with spjdhu+3q7 xiqptp:2jdj). 5i g ring 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 dowqm29kp1 zc39hy2 9 :vwlawmhrn her 2000 kg car to stop for a red light. What work is done by theyhl2p9raw:h93 2q 9w cmm 1kzv friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 6q7 f m7m8bhs4*ms cj4z0.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what d7 cj8 szs*m7mqh44mfbistance 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 surfacp j,qkroj j73+e. It has 24 J of kinetic energy. The p+kjor3jjq7 ,friction 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 horpqw uq0az/ad x32a-d8 izontally to a 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 moved a distance of 102p-38q0z/ wd aua axdq 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 if9id;3yf8 ko.s9v bnthe work done by friction is f3d yi9.kno ibv;s89 f$-6.0 \times 10^{3} \; J$, 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 infw+d,tm57vty (gd- 2trwx: ukclined plane. 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 friction f:t dwkg xm7dw-rf2tv(t, 5u+ yorce 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 rkd csv*-x(9j:iyi (r xm6l 2moest at the top of a plane inclined at 20e above horizo *mdk ( i-sjm( v:xricxyl26o9ntal. 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 along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes p;.zy;dnt2)nivxoas+ x2 y xg 86rh3hthe ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it faln;gd)2ix+ys yr 2pz;8ato 6xh.3xvhnls?

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 whenvzf6zax2vsn)m7 *c 2f he runs up a flight of stairs 10.0-m high, in7mxanvc v2sf 6f*)2zz
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 obv43k;s* ps2ae foh7apject with a constant velocity of 5.0 m/s. What power must be *haa op fs4vs2p37k;e delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp mo(n*8el rc c:jstor that runs for 1.0 hr? (1 hp:8 cjecr (s*nl = 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 whildebmz*zru*9 2 ntz,.*7geshbe riding. How much force does her foot push with when she is traveling at9z,zgez* 2*br *bdu mns.het 7 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 from 0 to 25 m/s in 7.0 s. What iz k ;n2b6cf0zf cwr/kwmg6:6es the average power delivered by the engine? (1 rw ez kcff6 wzn06cgk:/bm;62hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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