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

1#

What is the correct unit of work expressed in SIk* hdb*j4rjs0 units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there id s ahc/c7uq+3s 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 steh,vup m-/ h xf4bytdj13;;p jationary brick wall, the amount of work yo t-h 4;/ebjf;v1pmx dhy,u3p ju 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 yo8(o3b 5+yi k9ebce oam4 nb-and is being held there. How much work is being done in holding the box in y3ooeba ym( bki59-+ 4ncboe8this 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 horizo jvjs8lr9 *uu8g7k jc+ntally forward at a constant velocity carrying a 10-N object, the amount of work yo v*7 lc9+u rjsj8u8kgju 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 its origina3vu 72afp(s:omu psm8 l position. If the total weight is 30 N, how much works(pps28 uo3u mvm:a 7f 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 onh 8r*iimq6h7wi) n2hb fjba64 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 hmif 5;s35ek9ts)g1 j3mqi ,mf5 wrvugravity while the 31) q es; , kwfj5i5r5 s9gm3uvhmfmtiball 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 vs. x) graph, jatl p :it*zzp/,; 8ze60k exxrepresentstk6iza j8/,ep*zx; 0z ple:tx

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represen:;t+rmo ydl70 htb 9wdts the work done by the+r0t 9wtdb7l yohm ;d: 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 kinetic energyr goa.81iw)e/)ui c: fkht9ri

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 n9;uf46k6+qs*x r4sm)m pw grvvdk ti6egative, 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 an object is zero, then the object's kinetic energy +)w f yot .yiet8 1x8kqba7-vqga6z/u

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 mom0ki 8,n bboy :/nx q -gyprktr6:to-3ving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to :- or:b0 bo38kmpr qtn y-x6kitg yn/,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 mas 6:(9 8*mrealk *k e,vwfsf1uh5svt;( qfchbys of car K. The kinetic energy of ch rf8h,le*b95*vsffuwk(a qc6s:ye1 (mk tv;ar J, 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 bouncesg wk ) *spzo.(;n*qtjmk59kqe back with half of its original speed. What is the ratio of the final kinetic energy to the initial kink gt 9j kqkze p.m5sq*wo)n(*;etic 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 atx3skc, 9/hn9y zefxl1 a speed of 3 m/s and a pebble is moving at a speed of 5 m/sx3 lcy/ex9 91s nzk,fh. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving wit ld (d89u1nsnhgr6r5 oh speed 4.0 m/s. Bothdd8n s6lorug(51nr9 h objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a e 9 qxezw(* n+ldebr17certain distance on a straight, level road. If you had been traveling twic 1(l*7bwndzxq ere9e +e as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant ma mgt /) b2*pyv)eg3v+mf) evimss orbits the Sun in an elliptical orbit. Neglecting any friction effects, w3v)b p/+*)e mg mg)ymit2fvve hat 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 princis,(,4 qllaz .qphf*pbple.

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 eners59n/nw rj1cm 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 rest a height h above the ground. A sek3lii+2zz-g8vdpnap qd9l : ;cond object with four times the massllg 3i:8 z- pi+dpqvzdkn9 ;2a of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end h jsvm p-n:+vfx(20.ekblg8rc 7a83 fuvf1i eof a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the pofimh8+jnr 832es7g :ac x 0.fpl f v1uvv(k-ebtential 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 energyhh*v-u79zm q c 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 potsqw5zhd(*ul+;wshvz* ) bttb03t*pzential energy *bz*w zwz5t(v 0hss *ldb+u)ht;q3 tpU.

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 hill.xug22qjxb9d3

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 objectzuyp0f9n8am s306j+e u v.ili are sliding with equal speeds along a level frictionless surface. They both slide up the same fricpl us.a e830f ui+ 0v9jyi6zmntionless 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 (yt7elex7 d e9$m_{1}$ 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 energyg--tqrq7 2z; yllj*sk for conservative forcess7-qj* y-r2gk lztq; l.

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 buildc(lr tfjqg; bg)ae85 z 6d7)pding, through the air (air friction is present), to the ground be d7 )al()6rjptdqc ;zg8eg 5fblow. 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 gains 30 J of kinetic energy. Do not ignkq*d flu)ktw.j:1ye7a;3 luaore air resistance. How much gravitational potential energy did the ball loslfe7d;y.u *wa1t:)al kujq3 ke?

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 gravitai+n5e6j(27 p hsumpmktional potential energy. Do not ignore air resistance. How much kineti 6+iu7mmk 2shen5pjp (c 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.b 0 qju ph:tm;mmhv 75m9)1 sy7imhy,n

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 zs* tj7nis/k8c h5pug)o1p(v

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 exv c5j 0nf;nha;pressed 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, whicho;.uz:c-5cel a5i0sq1gq p zhd3i n:oq)q gb4 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 w0 m ,zivz(.ed4omkj/qork in one-third the time. To do so, your power out.qe(zm,/v0 ko4 dzmijput 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 m 22xldeqy rl:9rd 78uacceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 mkgdf ep8vz0/9 euf51g.y q5iry i++ek and held there. If the object weighs 90 N, how much work was dif9.f5d r/e ke8+ pgygyz 5+uei01qvkone 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 dis8lbxtx2tv x5+ e hkdpvi6 ao8w:g,(8 ntance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the etx2 axokn(v5 8 8vhw:idgl6+,8 tpxb weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with am2 , sbt0olyi*r7r -tqa fc7gi: cb,d, constant force of 5500 N for a distance of 50.0 m. What is the work done by, g0i72* mib-qytar scod7t,,: lrfbc the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force o me gm 4l8lz71v52unax t3d+zif 5500 N for a distance of 50.0 m. What is the work donemz x7lnt8ze4l2 1imd3auv+5 g 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 w y+,kkr6za gkz)zkd+ mpwydck 4/ 4w8yycg40*ith a constant force of 5500 N for a distance of 54ky /amp kc6++,rkykg0wcdy gyz8) dkzw z*440.0 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.*7ol1;k (apq fr+72bnkhjn hh3gt7 fb0 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 a m8of0cr7-+/p m jqlz + wua)irramp, 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 Sarsv l97lhkdd1 i 70tj6cah in a sled on an icy surface (assume no friction), with a 0hscj6d917kill t d 7vforce of 60.0 N at 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 o eqwmod*8rg*e lf,5trl70 ia: f the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves w0 ftlie eq d*5*or8 arg7lm:,from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the dire2b m; 1b uge,mufvn;bs-zjk.6ction of the force. The graph in Fig. 6-1 shows the force b m guubzfksvm; 2jn61.;,-ebversus the object'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 objec4jis l-6l83nd8 bv 3yv+dejsc8 fpu1n t in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find thed8l p34 cn1-jvje sf3ubyni8+s68dvl 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 direction 2 nc1v9wy:gvzkkx,2qod( (xl of the force. The graph in Fig. 6-1 shows the force versus the obje,ok xxvn(2zvydc9gw :(lk2q 1ct'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 41 ryiejy0y2 uis applied to move a 55-kg cart (initially at rest) across a 10 m yir ye0u21y4j level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at yecp8z:y 10eb.6cdj4cb+k cp sf +c7yrest) acros60. pkpec:ys7z+ 1+4c y 8cycfebjcb ds 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 speedldip,)ivuooh41 (a.b 68e o xt of 5.0 m/s. How much work is required to stop the masht4(i ue) o.1bp dx 6lo,v8oais?

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, b daz7cxxy3d *76 v:eoxo7h6k what distance is required to stop a ca7*zxov:oed6ba x x6 kyd7c3h7 r moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart .5d miqcqxno+:pef (lb-ae1 7gun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 ca1b(qqc+ m elpei75.nd-o: fx m. 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 a vertical compl6glk5r;u/z y(qncc r9 f1(vkonent of 60 N. The force is applied to a box which rests gnk 1cy(cl9r5kfr ;u6/qzl v(on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, str;ef mlc5mw 2py7laxwc6 b*5 b+iking the hay with a velocity of 60 m/s.b*xm 5ecwy lfmab2;c7+5 l p6w It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of r1zea:o4o. u(nvi6 vhr5pe) ygnhu+/7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational po+v .n(iyoo 65uehp1/:va r)ehzn r4g utential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and rises 2jrjf qliclh +bs10ak 3up(4vc,2+dn0 .0 m. Ifac4il+udk3( 20h ,jf1lj+ps n0c rvbq the plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causesiz)hzudh :pq;zs m22; the spring to stretch 2.0 cm. What is the:qhp ds ;2 zzhu)im2z; spring 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 character ,bu/b5rqlm zp7f77s nized by a spring constant of 60 N/m. How much potential energy does it stor7 /b,pm7 5ubsq7nzrfle, 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 comp5.fkw p-7 osoiress an initially uncompressed spring with a spring constant of 25 N/fi.p wko-s o57m 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,- ih0a 8vcsct4z8 dbq from x = 0.20 m to 0.25 m? (Assume the unstretched position is at xh, v8 0ccas4dizq-t8b = 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 1*zc2dde h)jo is initially compressed by 3.0 cm. How much work is required to compress the spring an a c2h d1)*ejdzodditional 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 j ,gl,ign/rlwabw ;7, slope. What is the speed of the slier on reaching the bottom of the slope; blg,j,ai, l 7rwnwg/? (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 hill w9h *ynsyay40b 91djlfith an initial speed of 4.0 m/s. Neglecting friction, how fas*dh1ya94yn ylfs b0j9t will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictieu .rv1m g42ph : djp9yy*(oyponless inclined plane. At the bottom, it has a speed of 9.80 m/s. What i h:u9 p*4pm1e( gpryj2yyd. vos 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 floor. When it is 0.70 q-)5f n*emee 4t-l85s(otzeeslv /vo8o vu: rm above the floor, its potential energy exactly equals its kinetic energy. How fast is isev8) ofv 85 *zo5loqe usve (r-t/ n:let4me-t 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 frrhx9vq84 nc t(1t;peoom ground level with a kinetic energy of 40 J. At t(8pvx9th4o; n tcr1eqhe 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 28nh 7t6vq*ahhs2 dn1) az:gqy20 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relat)vyaqnhn a2 hdt78g:hz*qs1 6ive 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 6o ; qbqr6/2;kmgi fpkof a dip (See Fig. 6-2). Neglqipmo6k/q;gfr 6b; k2ect 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?

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 p(uen9 ch:z 1fgwh38evd 2wc; zoint 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 a czz n:h1u8d9e3( gvf;cwe hw2bove 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 av5f0o hok:z.j/lyj f, point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller kj,y f5 hzl vo.o/0f:jcoaster 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 the2w6 yt+t)rm v)vnxg,w ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the verticalw+go ky9js1-6tca nw3 axis and released from rest. What will be its speed nw3og9ty+wck 6s-j1aat 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 initially uncompressed horizontal spribz e3d kk0gk u69u4fl2ng with spring cogeb0 lk 2346zf k9uudknstant 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 62p*sfnk )hkww6+ ht:ac(twaat 22 m/s, slows down her 2000 kg car to stop for a red light. What work iw sw)wnt6 h:h(* kftack26a+ps done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object 9j/m+ jc1gcpvand a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide cvg91p +cj/jm 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 surface. It has 24 J os cc7 1iy-ov2nsh0w.sf kinetic energy. The friction force on it is a conso0- h .7nvwicsy2css1tant 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-kcim6q .mv4lv5 hxkizu,1udj +s*) :sxg mass on a level surface. The coefficient of kinetic friction between the ,s*huijux s: zi c+m 4v)6vk.lxd5q1mmass 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 from restq- o.s zg0rt+ b3 wp(p vysa+hhu0s15j from the top of a 50-m high slope. If the work done by friction h+b z. 03s1 ( vyjshor5swpt p+g-uq0ais $-6.0 \times 10^{3} \; J$, 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 incli,j*e wu9)(lrd qa*pc xned plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the boxpcd*l, ) eru*qja 9xw( to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e abg kkw;, dmkw)w1enl o;8kz 1v,ove horizontal. The coenevk;,zkw k,lwdwkg81 mo );1fficient 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 drocxm9 /8acg .kbpped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frict/.g bxcmka 89cion 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 rg t4pqhf u2-8luns up a flight of stairs 10.0-m highplqu 8 hf2-4gt, 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 ksv)ff ,t/, 0k)uunn2taa4u jobject with a constant velocity of 5.0 m/s. What power must be delk)2/naa0)4fnft uu jukt,sv,ivered 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 motor that runs 2yb jrs6(*o58qmd p )-ostv sifor 1.0 hr? (1 hp8m-os6 r jq yso2)(bp5d*v its = 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How much force dodf. r exsts+-6es her foot push with-rs 6dsxt+f. e when she 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 from 0 to 25 m/s in 7.0 s. What i.r9f1bj p xl,th8 5zoi7o8o wss the average power d85rowp,7.flj x toi1sbz9 o8 helivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95