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

1#

What is the correct unit of work wm0f:f uo -mr-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 therpfqj 0j6eu:rh emrv p:e )r)w43p f53ge is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wallc c cpv q2cpkfl51y 6t/7+6.gqd7apkv, the amount of work you a c57 76tv+dpcc/6c g2kk.lqfpp 1yvqdo

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 theren7iz6f; etubnra p256. How much work is being done in holding the box in tp72i;nnt f uzre566b ahis 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 consta3e hlknc-d39 znt velocity carrying a 10-N object, the amount of work you dkl3e9 3-zcndho 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 lifted9tg ej-7z khygd*zy.rn1ga:n) s- -bb vertically 3.0 m then returned to its original position. If the total weight is 30 N, hj- .zzn) -1 begda:9rybk sg*n-h7 tgyow 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 obje qfnxey,r 6fp* :yfrt/8d4p3wct 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 th u; g6d/1lxv/x5rxpqc e sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it gor cq;g xlxu1/5vxd6/pes 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 po3b,k2 arg u.p pk7p982njdl mbhkx;s: sition (F vs. x) graph, representsgnr7 ubx2bkhspa,p :kp8 dmjk932;l .

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),wzcst xv-t,t+r)+7h+ 0xhs u g what represents the work done by the force Fr+ hu+0 ght,x+7z)vw - tstcxs?

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, the d.trk0f++p tuat8 g2en 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 t lpbns ;i6c6jx+l v( )esme2i9he 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 obj (/4 npa5cipoxo:t 7thect is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twinm; d)z 3g2rq,c )qm/qalc5agce the speed of the car. Which statement is true about the truck's kinetic energy compare ranqlz/cc25)m ,g qdq; g)am3d to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has h;e/bqcg6cqt m +ju-7 ralf the mass of car K. The kinetic energy of car J, comru6qc-/+qj ;b g etmc7pared 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 withg l:i 6u.hlws/pz)*r edc,c .s half of its original speed. What is the racel zr)s/.up c :*idhw gsl6,.tio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a spw9o0fd ,h6 wqneed of 5 m/s. If both objects have the same kinetic energy, what is the ratio ohqd,wfo 6nw9 0f 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/enb9b8 j)*+to irdl cieuj x m+33vb..0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance bu3drij+eib b*39l8mxc .v )ejto n/+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 ofghu87m. iyin0z9 ;t2yp5iwdz your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under tti 59;.pm wnz2hg7 0idiz u8yyhe 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. Neglecting anyoqa ad .w9;*vl friction effects, what happens to the planet's k *;aq .l9voadwinetic 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(dq :d 9s7kxmbda bj,gsk ac,y1jn 2+.x:wqk+ principle.

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 ez734 geb3 tm9srsx5 ppnergy?

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 restbe0jjo 3t9m:g a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential enerj 30:bt9g mojegy 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 causes it 1ctw39hethv z) r(4rnh2m m a:to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the springteat c vnh:1(2r 9r4 hm3mz)hw 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 ene xfnc,2l4 ko*qrgy 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. Cq20)d;t ,oy x hddfz+yompare its kinetic energy K, to its potential energy+qyd)yo 2 zxthd;f0, d U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving u tbdc k/6s;*drp 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 snx6av)rzu7cl (0*5pb o +gpy uliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater hei* bpg+5oy0l rxc() uazpvnu76ght?

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 us(a,1x qtd+f$m_{1}$ 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 :8lp+prqzd uwv /o08emechanical energy for conservative forces.8wrp8:u/ 0 o l+vpqdze

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 ( z x:99ytcowmn h+pi/j(5wlzet.ri-6air friction is present), to the ground below. How does the kinetic energy (K) just r/wcl(zmo+-ywp5nt.h j 9xe9 z:6i itbefore 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 kin*lx 8wx2z bvq3etic energy. Do not ignore air resistance. How much gravitational potential energy did thexblx3q8zw2v * 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 distan:. tv- n.hicqice and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did ththi-.nq.v :ice 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 conservationzx*hyr xse1/q:q a*7q 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 isxaa(wm /tc70 f

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in Se pk1f* +d 9j;o y; kwoah-yc(+muru/5pizlf4I units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not ak;h 69erp mihj/..bay 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-thls(gv-j;fd+7+ 9ip r gj9n vqbi -aop*ird the time. To do so, rsqlj7-bf*dgi o-ppvv ji+n;+(a 99g your 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 acce:-n5*cxszurz leration, 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 m p kj;.85+e8 mbnp5jnn, 5p5tz xztn26 fjadpj and held there. If the object weighs 90 N, how much 8kxn5tt pbd5zpn.jze2 f jn586;apj pjm ,n+5work 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 u sd)xuz) j.c6lj3pa- pp in the air a distance of 1.0 m, at a constant velocity of 0.50 mjzxp6 lpadc) u.3 )sj-/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 5500 N f1obosfl-go2dr+ 6 kr7 :kh7cjor a distance of 50.0 m. What is the work done by the 5500 N fors:f-+ohco7lk rr2o 1bgkd j67ce?

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 constanyznl **cf wtmel9.+8wt force of 5500 N for a distance of 50.0 m. What is the work done byncem8lwlf.y 9* w* tz+ the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for 6 ,8s4.zpxptc wwmrd/a distance of 50.0 m. What is the net work p,ztr/mwp.swx4d68c 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 mz6tl4o 717at hgr l9fo 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 dowcq1 zas+,vqg .n a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah inw +yoa qpa34y0r:qjg 2 a sled on an icy surface (assume no fricoyq40 2+jgrwapq: ya3 tion), with a force 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 directiony 16kml0,p0szi( 1pceaqcdidb8 ,nxg,g)l w 4 of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donei0)cc6i ,degz l(g4pnal8,d m01 ,pkyxb1sqw when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fo/u)l7spas p u aw2x(2vrce. 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 4.0 m.p27 supwaaxvs)l u (2/

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 ofy.)mt k v::jtfnmzl 61 the force. The graph in Fig. 6-1 shows the nlvf1 y t6kz:.m:m) jtforce 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 object in the direldu: 6mx5eu68as 9u(kxdzp+yb* gz tuo4d*/jction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fdm e+u d lpj65(xzk4/d 6zguuu9x aby*os:t*8 ind the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart ;(+ n,fy viikp y)v9jq(initially at rest) across a 10 m level surface. What is the final kin9 iny +yqv)vp f;,i(jketic 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 20u.ig 9 /tr6icjt +j.jmq.th63 fvgd- n0 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What isj+jdii.h9vrtttq6u n-cjg mf3g/6. . 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 speed of 5.0 m/s. How much work is required ,uucbn,cyu9vwrw9o q63 v,zz */c cj+to stop th *uz/,3yu r voc cc 9zwq9,nb,+wjcv6ue mass?

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 mo.k7lt9m(/zye eto ag 5ving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same con.y z7(ekotae5g9l/ tmdition?

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 force o8 .r r+,+b-a 6vcit:yky xzbqpf 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?-cx6ab y rv t+qpyk:bzr, +i.8

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 8d ,pgf-a y7juu18 mjom9n- pcnzw9g :N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's fin:gp-dn-81jj wpu 7a9m gfy z 8mn,ou9cal 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 horizonta9/zd-ab1 pedn9hhl /qlly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping f d hbp-9de9n/qz/h la1orce 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(gh*tk a9qtr( to a height of 13.0 m above the floor. What is the change in gravitational potegq*(9r tkth(antial 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 pbqdx3rkvxl.pr3 b20r *a+ c i7)t) ynhlane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was)r. xb3da r0h* x q+nyvt2 rl73bi)pck 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 sp3a/ nsdeci 5m.jw kz2o5yu: q8ring, causes the spring to stretch 2.0 cm. What is the 3woka.nc5/8ysj emd:qz2i5u 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 characterized by a spr(;*9e47yr xtg nsbuxq ing constant of 60 N/m. How much potential energy does it store, w; yxr xns7gq9eb*u4(then stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring witw .dzjf+wn4bx (.+ rtch a spring con4j bw.ct z +(+fxrwdn.stant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring co6lbsxt 1 i1wi93 wipw5x)0a9k*mmp vanstant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched posp altxk 35x*ba 1p9iiv)mmisw106w 9wition 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 c alv-fw ao3tv:5f t-o*onstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compressf*av3- 5:w avotlo-tf 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 of a 50-m high slope. Ww:hlx uw17b b2/r 0zlthat is the speed of the slier on reaching the bottom of the slope? (Neglect frictio bwrwb7zltu l:20x1/hn.)

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 with an initial speed;z d.wc0yu/ baf yn,:d of 4.0 m/s. Neglecting friction;z: , ywbuyd /df.n0ac, 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 inclined r(bb x 1;wq/ 7wnhy1gy.3pdqc plane. At the bottom, it has a speed on/r1 7qbw3(x ybq.;wh 1 cdgypf 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. When it is 0.70 m above the floor, its potent z (im.tkrbr+ e8k*8kcial energy exactly equals its kinetic energy. (* +.z8reckkb r8mk itHow 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,*je.*n 8x0cifcx e6eg blasts straight up from ground level with a kinetic energy of 40 J. At the f.geec6e j8x *0*n cixexact 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 ener llj)5 ;pepq(pgy of 220 J. At the highest point in its trajectory, its ki p;)ep(5lpljqnetic 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,zz43t liq.erp l+ *wuvkcm.7k.yg:h the bottom of a dip (See Fig. 6-2). Neglect friction, what,mv zwcrkphze*7g u.4llyik 3: ..qt+ 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 dh0nqzxlhc-eij; ,/)q 1 ro6f of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). -, 1i; hqd 6o/j0ezqncfxr)lhNeglect 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. 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;q.ln )3(bcyreh1i/:bigde r 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 m above the bottom of iq.yle/1) rihb: gc eb(nr;d3the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swingoadhn aoc2ct m70/c)/tyy-2j (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(fgzjh9 181m bu 8ff,u)i+onti1vchh pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its vu,z 8g(1)nthfi h+hj18fimfc 91oub 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 i2 sqct(49g1fv6k9 xo +kvjhzat 25 m/s hits an initially uncompressed horizontal spring with spring constak9(+fih2jxs4 91gzvcvoq t 6k nt of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a tp(hn f5zgz*3red light. What work3zf 5npz*hgt ( is 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 zvaii:1z *pgw r 9pes(8 qtj89between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m* pp 8s(tez9arz1:w89iivjg q/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It hathk2de +h,( i yll,-sas 24 J of kinetic energy. The friction force on it is a constant 0.50 N. H2hl k,,ia(etd+sylh-ow far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. T4l o-:1d8x2ufvo dtydhe coefficient of kinetic friction b xfodluovd- 481:dt y2etween 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 ofdr udz w4ye;qmy 2gp-)4vq ;ve35r,bj a 50-m high slope. If the work doner 4 ey;w2urqe y3v dj)gm5bzqp,-dv ;4 by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The pdz7d/p 4 zo,;hkld qiv8 q2i)xlane 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 magnitud,iz p2dq7x/4iz hl8ok)d vd;qe 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 ofg sug*y.w2ge t7, ;ewt7wmou0 a plane inclined at 20e above horizontal. The coeffig2;twwo7 ,uwue.0* ggeyt7s m cient 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 heig u8m ryv1;*)-d)hrwks ij kxr9ht of 10.0 m, and strikes the ground with a velocity of x h dj 1kvw8yms)9)u;rrir*k- 7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight ulj;(wm/0+m3qo:fvien y ;oz of stairs 10.ovmwmifj3/ n0o q;zl+ u:(e;y0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. v :.m*wdfp6xa What power must be delivered to the object by w:f*.dmv 6pxa 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 4e2flc fi 3m .6kikd9kruns for 1.0 hr? (1 hp = 746 6ef 4l2.k f c3d9kimikW)

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 whx0bvm *k-exv x *l:zq/ile riding. How much force does her foot push with wh:m 0*blxv- /xxkqev*z en 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 accelerat x9* tn8s,rsyses from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 s9 sr,y s8*ntxhp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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