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

1#

What is the correct unit of6l1*aut 9uky z work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no-qe3t9 yv bn)l motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of work yg1gd5 ,awjl5gmo y-i vc26m9co955mwci gcdo6 j 2vg y1a-m,lgu do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being a+8omooftw +w.2ybs v/6f4 cpheld there. How much work is being done in holding the box ip6ob2t/v m+fwfa wc.4s 8ooy+n 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 ckgi :06zn2s kbarrying a 10-N objectizks2g b0n:6 k, the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to ito eok+.u7 y9ya8*dz tos original position. y y*ao eto.+do8 uk97z If the total 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 /f(,f5 eciab/ ( )dvwdg2qrhbon 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 ofsph69; )ip onmm4xp5 w7zw+cy the work done by gravity while the ball goes up with the sign of the work mi m)5 4ws9;p p6h7 pxc+nwyozdone 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, ow0s 0m3wp qre(zm-t q.sij( t+n a Force versus position (F vs. x) graph, represents zw00.tpj q+tm3 (wqsemis(r -

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 representsww)kgj c :/1dzzp uz)6 the work done by the fo ww 1:j/cuz6dzk))gpz rce 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 xc,bo. j:gk3vis positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then th6 y7 gktnke;6 jlps0eg79 kd mjnpm:16e 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, t v1g 44k iou,eo-v:g8uztuc16 4yhueshen 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 ca/ln itrr u3rgr3zc (.w 2ew9 aalg14c9r, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy comw /92a3rg1gn 3z.awecu4r9 lr itl (rcpared 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 Kcxhzx : ybniw k52+ ps0s;a,./f rcvk;, and car J has half the mass of car K. The kinetic energy of carfwv2 5 n.x0k,ks;y+xi;z bas hpcc/r: 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 bounces back wc- f)9(54,rky/u)zsm h o wtrvp0vay qith half of its original speed. What is the ratioru(swy)/zq9c- ty vhofkp),ra 0 m54v 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)hr23 hyjngbji82 5 n*gc . lh2r4xkoa and a pebble is moving at a speed of 5 m/sn242xg rch*8j.5kb hrgoi hjl 3ya2n). 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 with speedf-z. l /c:o; cxeb6bew 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whic./;6 f lzxe:wboc-cbeh 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 ;ao5u) ismyw1(b sp/e of your car in a panic, and skid a certain distance on a straight, level road. If you had beenm(sp5u1;) /yesawib o traveling twice 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 mass orbits thov + r st (d6dtn(ilufbnw)7)k,w)h1ce Sun in an elliptical orbit. Neglecting any friction effects, what hvnw)1os(6n(7b tl)drhk)ti f,dw c+uappens 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 prin0em.ro-b eg )y5/ ngt1da k-lgciple.

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 systemw .nzaejvur7;0 2 n7ai to have negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h:bq 5/fzeoym ex x-i88 above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to thy zx 5ef:mx/8eb-oqi8e first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes dbnm;lpw 4gx3 89hx 8xit to stretch 5.0 cm. If another 0.200-kg mass is added to the sprin mxx8bg;4 3 9wxhn8ldpg, 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 syc7w4vxu0 k* t(+qms wostem

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 Kd(9fkl-3.0oz dtj4 j ,nkzobj, to its potential energy 0 j-3 f.t9d( 4,jjkolb zkondzU.

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 dks5 nqgv. br9 ks+g2k.riving 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 objecy5kl )bbh m99-( .rxdxlj(oh ct are sliding with equal speeds along a level frictionless surface. They both slid 9cr)xl5b(bxoyj l h(d 9km.-he up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses n4 ga jp/en-h8$m_{1}$ 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 conserva0/* iz2mlgodvtive forces. 0l/2godv zm*i

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 thlhu,bu8und2va 80tn,dy6 7dk dndg/ (e air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top ofv8uldd6dn,a ddh /y,n t02g8un(7u kb 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 ignore 283aw b7t rjqt1fy,j zair resistance. How much gravitational potential energy did the bala2wzr8t7 ,j3b jyqf1tl 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 ej 1j 0zgv+tx5l/*tj +c9w 8glywzba:of gravitational potential energy. Do not ignore air resistance. How much kinetic energyj 8l+9t0ex/ j5 c wg+j t*zzwbg1y:val 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 conservatzd.9d.mf 4 mjnol*v+kion 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 is99mj-/ y;wgsq: etsal

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 ofgr 4x,v/(:hj ;g.7/ yybddoa-gj +u btf+ucod 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 is8qbqr0n )lq)l 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 wor cq .ts;.,lm t-tcui2 7z.1 ztzxdlqd1k in one-third the time. To do so, your,11- ttd;.d7qi xzqzs 2lmcltcu. t.z power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's )ptty zbok03 r0 63yjtengine 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 verticall*, cqmu,7aw (wd4xt i)lpyxc1y 2.0 m and held there. If the object weighs 90 N, how much work was done in lif)7a qupw1,cd(w tx 4xyl,imc*ting 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 bol 82ezu9l7-dtr4xx 8+hky 3yroa l.wnok up in the air a distance of 1.0 m, at a constant velocity 47 2o83hnlar.yly x8ew +dxtz-u9lkr 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 pulled upward with a constant force of 550ekwv 3qpbo4s85:lz 8)kuj (t z0 N for a distance ojkv3pl(ks:q5zw)u8et8b oz 4 f 50.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upwa;n c3cc+n 2nimrd with a constant force of 5500 N for a distance of 50.0 m.c3ni2m nc n;+c What is the work done 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 pulledt e s;/5v:qcvj upward with a constant force of 5500 N for a distance of 50.0 mvj ;v:ts5 qec/. 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 1zgh:kk9ss 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 ramp, incl 4 nyq:grzvj2asvh-46 ined 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 sjso p 7 8th*/kwinh:,s fl-p8lled on an icy surface (assume no friction), with a force of 60. 8:t os*nh-p/ p j,f7hik8wsll0 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 of2m)ak7vghb *s the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moveav7k2s mg)h *bs 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 direc1fs 1 wrt+so:wpdw3x *tion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.3 tsw :x*w wf1srdo+1p0 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 ida669pnp aj9g l0m-ab n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Findmnpa9a6- a6j0 l9bdg p 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 direction of the force. The graph in Fig. 6-1 sp n8t)4vb (jyzhows the force versus the object's pz)(n8bj4tyvp osition. 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 appl(;0it0 eczxap) sek1d i(fli (ied to move a 55-kg cart (initially at rest) across a 10 m level surface. )0k ea;p1d(lx(0it e(fics iz 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 l:s4-f q fx tgmr+z0r5t.b5qy;nbtr/rest) across a 10 m level surface. What is the final4t+f/g l0 fb;5txntyz sr.5 -rbmqqr: 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. Howccp8l +e 9/x9/ hlrrgalws./i much work is required to stop the maslclp/+ia/hrrcw/8. 9x 9 gsl es?

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 caom2uq-ft8on 77 whs-kr initially moving at 25 m/s, what distance is required to stop a car7k7--o 2n u stfhw8moq moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by*,yv;lcyji4 a)x 8 h(w tj1hbk exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assumiyiw,vh cjx8(; *kylbta h 4j)1ng 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 hory50kis 3)k om1tj of/es)j z-vizontal component of 80 N and a vertical component of 60 N. The force is applied to az kk3tvejom)1jo-0 y iss)5f / box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, striking the hay (aegnus9wvfj/ 5-in7with a velocity of 60 m/s. ni-j aew/59vs( u7n fg 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 7.00 m above a floor to a hez )sjghrhd 6*+ight of 13.0 m above the floor. What is the change in gravitational potential j )*hr +sz6ghdenergy?

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 planel/v f7it6,r0s w qai.m. The plane is 4.0 m long and rises 2.0 m. If the plane is frictio,f7 imtl0rw6s ./qv ianless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stre /)6(h0z5q jrsm 7q duixfmw,ltch 2.0 cm. What is the spri rjqsw)uz mli7/d0 m ,6qh(5xfng constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. pa:vs jf5rl +4How much potential energy does it store, when stretched54 lprajf+v :s 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 reovuegnr/* yp3w)d 5:dsy/qb2f e* l kcaz)w* 1quired to compress an initially uncompressed spring with a spring constant ofeyngwfdkol) uq)zer / :d/5abp3*s cv1 y*2w* 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 sprinsc6 u02 w vltbci64ee0g of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretchet6 0evewb46c lucs i02d position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 v jne 4jq+/n/w 7y)aibcm. How much work is requir+7b4v wj yi)ej a/qn/ned to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top ofru.8z3vz7yj i/r;bt r a 50-m high slope. What is the speed of r. tirj3z87;by/uv zrthe skier on reaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a p4t*5a7hxhk . 2zsox g wp10hnhill with an initial speed of 4.0 m/s. Neglecti*pzhhx0wk na7ogp. 2 t s51h4xng friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclinedt, ik 7hqp1b l9yi/7ea plane. At the bottom, it has a speedil tq1, kyeb7hi/a 79p 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 floor. W5zb vgq n/ya6.hen it is 0.70 m above the floor, its potential v 5/bz.y ngqa6energy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up fr 5x.m (.ha*3pdf/z/vmsiw wwfom ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does ihi .szxm 5d .fa/w*m/p3(vfwwt 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 gr/s h7,t -1dkjrf2 qsusound with a kinetic energy of 220 J. At the highest point in its trajecto7jd qf2k-us ,/ss1h rtry, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom ofl zh+n,(eb2,0zbv oh a 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 l2b +(z va n,bzh,oe0hthe 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 a;g7,9x4y htnldco p0 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 thhco7x ;,g9tydnal p40e 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 h2lwspd)dqnl) af0*:kq r 7c9speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed dd 0s)9 q2kfclwp*7h: r l)nqaof the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bw0nzn; 9de;ju/ahh. qottom 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 0.27 m away from they/ ;dvi0 ampf6 vertical axis and released from rest. What will be ;mi 6p v/ad0fyits speed at the bottom of its swing?

A. 0.374 m/s

B. 0.997 m/s

C. 1.495 m/s

D. 1.246 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 bgqwoef / 6n8hghowk ;a,7j-) m/s hits an initially uncompressed horizontal spring with spring cons7w e; ,fgo6wh-8jba ng/ )ohqktant 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 :i( rra26q v;q6wepth-r1jq xto stop for a red light. What work is done by th-6j r61q:w;rh vrqaet(q ix2 pe 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 bet)bknow(5*1 g)ubjw7vhl9yr.i( mx l i ween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of thguyj((l.w9b5bn1w ximkv) )* r i l7ohe 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 ox1/v yu;r9mxin a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a c9yu; r/1mx vxionstant 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 surfal u(5lb /qgwh( c5m3fgce. The coefficient of kinetic fggqmf3uc/b (5w5h(ll riction 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 from rest from the top of a 50-1f/bqyh0vnob* : ldi 3m high slope. If the work done by friction is 3l 0h1bbiv/y qofd:* n$-6.0 \times 10^{3} \; J$, 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 plan2.h,hn ;oo ixpq9ay9b e. 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 avhp oani.,29q;h yob9xerage 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 res aqs-g;io lazmjj( (e .:8m;hnt at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the.z;8omsqgnlj i :ma-h e (aj;( 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 4 uah.mn xvmin-7bw3 (10.0 m, and strikes the ground with a velocity of vb(.hnauim 47x m-w3n7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy urap/ +atx92x tsing energy when he runs up a flight of stairs 10.0-m high, ina+r92/ x pttax
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a consta0n,;pdz vmt7h)+y jw 4al gwn6nt velocity of 5.0 m/s. What power must be delivered to ty,a )4twhv;m g0zdnw6 p7ln j+he 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 f:n6b.3pwrg bb49:quisris5 bl(c+m mor 1.0 hr? (1 hpswl34 i b:m : g6nqb5p9r.bm+cubr(is = 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 does h7bp3xzffb r,1er foot push with when zb7ffb3p1, rxshe 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. What9 ygysyzjm5eb 3epu:63e6jk 6 is the average power delivered by thes j3yy:eezbk6u5 m3j96yp6 ge engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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