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

1#

What is the correct unit of work expressey6y jysc*:8h 8n3jbyl d 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 5xn*syis50d lmotion?

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 stationa3hmt *q91 agdecc: +. ,u1qn(rbd.sl mlf,t riry brick wall, the amount of work youdf. lnb,uttcrl:qqm9*a e d(h, i1r. 3s+1cm g 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 held ptjhmmwg 1r11i x9d43 there. How much work is being done in holding the h g x1r143m1jtd9mwi pbox in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying a 10u q8ba d4l4en3-N object, the amount of work you en l34bda48 qudo 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 thfstojtg0 872m+m ki*a(t s*h(pdjt m ,en returned to its original position. If the total weight is 30 N, how much stfmmm 2*po j(k8(i 7tdg+h,st*a 0tjwork 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 anz+ne ptp-;( zn object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Co,n )eu0dleb :fmpare the sign of the work done by gravity while the ball goes up with the sign of the work ld:e)u nfeb0 ,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 ck) :1zqj esfk8urve, on a Force versus position (F vs. x) graph, representskqzj)s81e k:f

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 posi fkkupk ;hxn5 f)rc8 :c dletx.2:kz91tion (F vs. x), what represents the work done by the for9cr8fkp:hk5 :k; c) .dfl 1k 2utzxxnece 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 donez lqk5l-u;-w :s0afwusd /z c. on an object is 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 the objec+xifp5 mtbeq;q p6n:+t'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 kineq adek;-tsh9:h4v 5g utic 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 cadxh)qw hz7qf q*1/u( sj+tde -r, and is moving at twice the speed of the car. Whz edhqdq/j -shuw1)xtf(+q 7 *ich statement is true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car -zv4/x exdmqde8v9tzk6t / *hK, and car J has half the mass of car K. The kinetic energy of car J, compared e/mzvtzdkh8txq -/x 4d e*96 vto car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its otg;7(x 1;yu6 byssbkr riginal speed. What is the ratio of the6y;kx7bu1 gssb;rt( y 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 alx-0 x *:(hgsm jvm(dpt a speed of 5 m/s. m-h*d0xl (j sv:xmpg(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 wit xqmxkm7luo4fl 0,+v 8h speed 2.0 m/s. A 1.0-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 trave m8x7lko+l,x mvq4u0f ls 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 panicl x9sjl-7 l,ga, and skid a certain distance on a straight, level road. If you had been traveling ljg-7x,las l9twice 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 the Sun in anbz ;obfoykro,k0: 0lo-kji: 3 elliptical orbit. Neglecting any friction effects, what happens to -: boor0 yoklo ;3zkj:b,k0ifthe 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 princ17/,arx. j7g+ y bs(bm nbaifliple.

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 hadcisff -7bcg5 . v)s0lve 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 0i 6m/8bj fg.ftvqcu: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 energy ugjbiq6 ft/cm:f80.v 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 to str d2 (mpq5axv:eetch 5.0 cm. If another 0.200-kg mass is added to the spring, the pot(dve:52x mqp aential 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 wq nlx 0)clfk8)wi )t4of 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. Cxrcldml qx(0g (/j(p+ompare its kinetic energy K, to its potential ener p/mx0cr(g( j( ql+xldgy 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 up a hillsu)0)f4wuw bfw4ck b0.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speeds(jc865y b/)d.ibmmlvijxi 4q along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater hei)x ijmb i mc5i.4jqy(l6vbd8 /ght?

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 l/ i* nwyl v k9thlplf/r4a65*$m_{1}$ 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 mechani7z 6t +seflke5cal energy for conservative forces.kzs+ 6fetle 75

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 u 0hz3l 2 kcweg4 bne 13xiehua174uz8air (air friction is present), to the ground below. How does the kinetic e3nic uhg3he uz04xu2 z l ee181k4bwa7nergy (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. 7zsiu4r hi5we8td+*s oo2ur5 Do not ignore air resistance. How much gravitational potential ene2z45 ioe du+hrtsi5 7o8rsuw*rgy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of g7d 2,rxwvy) omravitational potential energy. Doo)v yr7x 2w,dm not ignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation oclyk*-)nwveks/ 50md f 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 isdm3mmgu;t0r7ny2 w62uu w t2p

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 e; 9(l.zchyulapmi27 wxpressed 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, whih q-yw. b*2fje:dxl1jlw ko :9ch 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 therm;tsbsus7- n 70f4l r work in one-third the time. To do so, your power outpfssnlrmubs -4;t 7r 70ut 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 constqes75+ a hnl+hant acceleration, 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 and held there. If the object wuv+l-7j93l jagualh 2 eighs 90 N, how much work was doneuj3+l v aa lgj2l-uh79 in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant pmz5aa951 mf j6if od)velocity o5f fz9)oj 1ia5am 6mdpf 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 constam ur c0nr6zu4y*e(9 zunt force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N cuuez* r6 y(0uz9mrn4force?

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 constantrhzxwyz(c. c ,688 va ;epo8xj force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the e; 8zwavrcyhx6 ozj,p .8x(8celevator?

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 upwio n4hy *:+b)y t1nza yzs7fr,ard with a constant force of 5500 N for a distance of 50yf4 atn :*+so yr1ni,hybzz )7.0 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 6p9g.xw 3 2zzbb4dj ku..0 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 shb,;0pbi.h e down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy trj*:q.w -phb surface (assume no friction), with a force of 60.0 N at an anglep*t :jqhbw r-. 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 obje7*ob jo rwl 5/n:3( cst:pffcwvvjd75ct in the direction of the force. The graph in Fig. 6-1 shows the force versus th( f5ojwwcv57frt3 pb: cd s7:n*lvj o/e object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. Thequ jh yj1r/nna(4rz6: graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the rzjhq 4 yjua(n/6r:n 1object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The :k,b y tzztye r57hqz vd73.i)it84qq graph in Fig. 6-1 shows the force versus the object's positio 5hqqvdki4 z3ztyy :).7z t7rbe,tq8in. 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 direction of the force. The graph in Figqqi8*yjn .d1u x6d-ar . 6-1 shows the force versus the object's position. Find the work done when the object moves81-rdqqyn iajd *.xu6 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 isfkj43 am .bjz. applied to move a 55-kg cart (initially at rest) across a 10 m le jab3kfm.4jz. vel 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 Nj kp8s; .m+ )hgljxrs. is applied to move a 55-kg cart (initially at rest) across a 10 m levellh.+m)p 8sx rj.gs;j k 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 speed of 5.0 m/s. Hwr35 f, i zhrwx552gbgow much work is required to stoz irrg2 55bg35wxwh,fp the 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 modznt-mi/ l1x 4ving at 25 m/s, what distance is required to stop a car moving at 50 m/s under m/4t lixd z-1nthe same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a force nt(0g ob )a;v8b,.q9asp y2ajdry tv0 of 20 N over a distance of 5.0 cm. With what spv.0v;g9ojayab,p ( 0nb2 t)8qas t ydreed 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 hb 5hh;ad2( klmf3 bd1h:b*kuuorizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor.k bu*hd(ha13l;fk5bd2b:u hm 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 intj 52rh)uuh bk)o a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befor2 uk hh)bj)u5re 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 heigh4)l iyc0oyhq/h)b:a; )wm3qi r u3nau t of 7.00 m above a floor to a height of 13.nh:cyyurba))3ilu;)qhm/ 4wi 0q 3oa 0 m above the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. Th)1t(mte l cj7le plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was 7)1j cem(tltldone 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, c.i gr-v hjxksy/ ) p/kf.9wxiwl328u(j l/aakauses the spring to stretch 2.0 cm. What is the spring constan/3-fgaw2k/l9 ih r yisu8xj kl/vk.)paw(j .xt?

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 constant9)pr. z: l1wijfy0knv of 60 N/m. How much potential energy does it store, when stretched by 1.019nvzwry .f 0ikp):lj 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 comp gdx7n+gz7v (iress an initially uncompressed spring with a spring constan ng i7gd(7x+zvt 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 stret ::ax h- v;ra)os,hat;(h6zj b2sc bfbch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstr-; axjh2;tzs r( o, bah:v6:cha)bfs betched 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 cm. Ho*g3a,m 9:vtrdb uags g b320ltkht t.8w much work is reh293 vd t,3bkgbgrtal0 g s:.tatum8* quired 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 res b beo9qlcy6/(f 4krg0t from the top of a 50-m high slope. What is the speed of the slier on reaching the cobfq be6r(/ykg40 9 lbottom of the slope? (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 moa55g nj,bk794z;qpd v zzv5top of a hill with an initial speed of 4.0 m/s.5k zno ;4qvp5vab7z,jd g5m 9z Neglecting 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 ik4+uvl) +)( ftt *w g9ovvo/b,nnkyo inclined plane. At the bottom, it has a speed of 9.80 m/s. What is thefk vv i)u)tvt+,gbyo+/on 4n9wok* ( l 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 v7 jj,ib8 f6pgl p9m;gto the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is itmli;8v,pgg fp7j j96b 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 we84y.x/ m+livq3tfm om ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mech/lmxw34+v 8tm efy.iq anical 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 gr; ;qxq 4v 5xf29skzcj2) gww-a afpna2ound with a kinetic energy of 220 J. At the highest point in its trz wk5xw4a;a c;9gn-p jq 22fqxsf a)2vajectory, 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 th v:m cr*hqcx01e bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster*hrq :1cmxv0 c 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 t+gl 4v cj-iy.mghu,9 point 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.mgjc ,lu49yhv- +git 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-n.rgxjnmx z; 5.ven6 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 coaster at the top ;nxnr6 gv-..nmxz ej5of 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 bottom of it6 xggh9b/g(ftpu8xm5g y ,a 8cs 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 vewjz ub13w(v4hg7.f yx2x vj;hqfn /:lrtical axis and released from rest. What ;xh(nvqwy f.w 3v:1ujl /hz 4b jg7f2xwill be its speed at 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 hitsmtbap p76eh,vpf, ba+w n7j (+ an initially uncompressed horizontal spring with spring consf7t6+we(bpa jab,,+ p7ph n mvtant 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 3 ts/c(bxj 0u swl;s;5g(iv*w-eqsibdown her 2000 kg car to stop for a red light. What work is done by the friction force against the wheels(bi3i(qb/wesc5 xsj ;v*ssw -0 lgu;t?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surface is fx7x9+f j/bbl aqn63q 50.0 N. If the initial speed of the object is9b jf7+lqnf6ax qx/b3 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 movx/ c 9c-*v-homzbaas) ing on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide?v9*/caaz xm--hos b c)

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. otn-h odd w:nj0oio9o-2 4 q3w The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, w-ho03 dot4:ww oi-2 9onnd qojhat 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 vm( ie hj:h.t4top of a 50-m high slope. If the work done btme h: hv4.ij(y 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 plooh9.v/ut(7wmsok0 gf7ua gb r;:xm0 ane. 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 w ;xk70.hvs:ou0tugrom b 9 (wmag/fo7as 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 froa4+b,fwp pp 6 6unl 9;fcy:lgfs9bi/fm rest at the top of a plane inclined at 20e above horizontal. The coeffil/+w64 cb;p,pup:gfs9nf6f f9liy ba 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 height of 10.0 m, and strikes the gr5kx xp mxx 0,x(xyqh/h6x; gx-ound with a velocity of 7.00 m/s. What average h;xxp5xymxxk/ h(06 -gxxq,x 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 fligq sh5m ..hi.qzht of stairs 10.0-m high, z5msq . .i.qhhin
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 mo4meo) 3n +vieuve an object with a constant velocity of 5.0 m/s. What power must be delivered to the objectvo m )e3ein4+u by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? m.t(vp0u xyqx s 6*a1k(1 hp = 746 k1axvy sm qx0t*p6(.uW)

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 he 17vk6mgb.ne rr foot push with when she is traveling at 8.0 m.b 7e1krm6 vng/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 gaum6*gm84jn 25 m/s in 7.0 s. What is the average power delivered bj4gu *n6 8mgmay the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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