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

1#

What is the correct unit of work expressed in SI un1z(s6 5 ioqh)fgptq x4its?

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. +y+fn2hqdb q5oisbe-iyiv/1) )zb a 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 again;ppe;47o.i se (t4lml9mx 6puje iew4st a stationary brick wall, the amount of work youepm7 ue69(m4e ;spplet i 4wj;4o. ilx 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 verticala5itz:f jr y1(ly and is being held there. How much work is being done in holding thz1 (rt:iyaj5 fe box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carryi oj m.+qi2p/ajb t25jgng a 10-N object, the amount of work you doj5j mp.aq +/gb2 t2jio 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 z.5tx0x,mg ryits original position. If the toty0mx.g z,xrt5al 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 objs03.v7 rthbkytq3 po5ect do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the wr(e r:nk 7236qp lh8tmjx9znoork done by gravity while the ball goes up with the sign of the work do6z32jn 8rxl otq (p :kre79nmhne by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a F6k binzi z g kv0fpa;xgj4,7(9orce versus position (F vs. x) graph, represents,4 jzzfbx i6kgn0;pa7 kg(v9i

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 represents t-9o5v sbcye f4cf7qg3 he work done by the force 735e-9cy 4fqvsf gcboF?

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 po9)yxzdy g2 :renb n+qdvx)0*tsitive, 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 negativev2wy 2eqm6 o9mrpzi68 , then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object9szx,5f s(sm/ 8.sfhbd v3zie 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 ;ox ,zcw5uy;kj 4trv ;h0 bl3wmoving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to thav kw l ;b u,tz;5rxjo43yhcw0;t of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the u7adc.xy3 aju8eli he*/8 x);ykgfx by +m:4e mass of car K. The kinetic enk*f8e eg3cm/7+bay :8uyd )yu;xx .hj xa4el iergy of car 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 hr(geaplmv4 4*folm ;ui1+m6p23oai back with half of its original speed. What is the ratio of the final kinplie gi ml 46m1 afu+a3(r*4;2pmovo hetic 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 ic2:uc-:t9tu p)pm eaof 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy,9tp ):ma-u:tc2ceuip 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 sp.8axchz9 (b, qyvted3mtro6i)0: ggmeed 4.0 m/s. Both g0myz,ei( 8:6 ghtomvqcbd t) 9.axr 3objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distance o6tsio3r /*:afzhu. vtn a straight, level road. If yo/6f3vzs ro*atu: t.hi u had been 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 massqw 0*f6 kkdp (yt69bmk orbits the Sun in an elliptical orbit. Neglecting any friction effects, kb*9f (k6tywd6q0kpmwhat happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy princiz9n1l6b tl wvf2f:j(s ple.

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 sys0ixi;a)wtsy7g7 .ya/ 6nv)fwrztx1j n2ep2j tem 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 heigt yu9 s7xgl)7toy)*mpht h above the ground. A second object with four times the mass of the first if released)x*upy9 ymts g7lt7o) from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring.e -e.z wdz6yp causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of t p.zdzyew6- e.he 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 en: 75sglev; osoergy 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 r 1t4c5nmwfd)w 7aoe8 a tree. Compare its kinetic energy K, to its potential energy U.4ca t57)dmwo1 nfw 8er

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 drivingerv*l1r9 i4foh 9tz9y up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal n (lsjt dmh;-lz./n7m c hcc:8speeds along a level frictionless surface. Tlccm td;zj7sn.h /:(8ncl-h mhey both slide 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 .duk bbaarce0 ;j;2izfh,- )z$m_{1}$ 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 conservat2*7zepyn j lp*ive forces*npy 2l7zjp *e.

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 theqo** 9ona, c)o*qonyl top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking theola9 *)noo,*y*cq q on 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 dista fq q xj06kynh71,kcz5qr pw);nce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gr7rk,c 1 qk0n6wpqf;qx z5 hj)yavitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance a,j/hakc-b h1 d5lf a0fnd loses 30 J of gravitational potential energy. Do not ignore air rc-5fa bhl k0,f1/h jdaesistance. 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 con8b7sqp 7d;cf 6uzhsmv:w5878 h cewy wservation 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 is504 vc oz slw(pnuv1p1

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 ofwxt57g-s, jn g jbqu02 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 7/+ * 2nasxph3sueniu0wtin5 is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time. To do sor9t 5e l,dxosu71lbdp:s7m.s, yourer:uo9tlsp7ld,bm1 x7.ss d 5 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 e2sin;9 4tu9 :iqmeeba constant 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 weighs0hjup 783b 0dou(yahx 90 N, how much work was done oa u08hhu 7d3bj(0yxpin 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 distanps;bot lt/b)2ce of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weil2/bt pbst);o ght 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 upwnqcalc0ac lvb06;ll vh**0 p6 ard with a constant force of 5500 N for a distance of 50.0 m. What is tl0*cahqncllc6v *p b;vl060ahe 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 upward with a constc1cdc*pmysl;2+ e yd 7ant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of2c ; +mypddcls yc1e*7 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 5 .vos*8s-fi zdpffds;2-im8(zc+ y, ssqe, iz500 N for a distance of 50.0 m.(d*i-f s28,osmzvyf- d;i8s+ zfz pcqessi ., 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 up ala8 -txj9gk rp7ong 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, in0,h-4ihyumn fl.5re xclined 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 sist.s j5ij7lj-fyer Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle ofs-.5j iyl7jjf $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the forcee)e/q*yy - j bfovit12. The graph in Fig. 6-1 shows the force v vyjyte1* q/ bfio2)e-ersus the 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. The grapx, ct,t:l*q ffh 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 mt:fqfc,x, *l t.

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 direp 5w s3/j:rbsa4ua d 8b4vjjc4i2t do0ction of the force. The graph in Fig. 6-1 shows the fr/45ia au4j0b d83wvdj tjo 4sp2s:bc orce 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 direction of the force.19 vdnh i1kb+0hu*o 4gv0scze The graph in Fig. 6-1 shows the force versus the object's position. Find the wsvv 0hgu+hb9d4ek0zo1 n c1*i ork 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 4ctganfef r,i z2+92 e55-kg cart (initially at rest) across a 10 m level surfa2 cz+ tr4eia2fge,n9 fce. 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 appy j p973tgdt/ 1co5hgalied to move a 55-kg cart (initially at rest) across a 10 m leve31o/h59 j tgt7gcpyd al 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. How much work ivan t7zl;6. pns required to st.t 6nnlavz;p7op 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 initiallypz-3fcdi,b p-dm d 7(q moving at 25 m/s, what distance is required to stop a d 7fqdbi-,pdc-mz3( pcar 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. Iti89+akrpjy* po3.rlh )d ;l ay-ntf5j is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negprpi*5 l drtakj;3hn8.9ljoy y+) a-fligible 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 horizd 7levf v(:maj1 ;acm-ontal component of 80 N and a vertical component of 60 N. The force is applied to a box whichef;ca:-dav(1 7mlvm j 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 hol: ig, :+.eszvn1ki g 1cyn d8(v8whzorizontally 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 force acting on c8 w o enl +gk,dnz8(z1hg v:1iviy:s.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 b3v0 xwm4u:pjheight of 13.0 m above the floo3:u4bj 0xpmwvr. 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. The plane is 4/**vz cx g+zvh vrmy/3.0 m long and rises 2.0 m. If the plane is frictionless, how much work was dg /* vyzh3/+vmzr vx*cone 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 spruzrd -zj+:yez29ia5w4c k; koing to stretch 2.0 cm. What is the spring constantzr9z-2ok w+ eic;a4 jz:uy5dk?

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 conz0/ q/uaknt:w+z;uyd stant of 60 N/m. How much potential energy does it store, wheuyd :zkwn0/;/uz aq t+n 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 1vn3jmcvb i)0 to compress an initially uncompressed spring with a spring constant of 25 N/m by 10 cm.3 0 ijcvbvmn)1

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 required4i-orxf5m ly0 7e6xri to stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched5 xmfiixeo r0y6r4-7 l 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 17opzl.5ysv c6bhv0w 35 N/m is initially compressed by 3.0 cm. How much work is r0hw.olp5sv3v6 c zby7equired 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 rj dxajy vp +fo6zgh 9545s35rvest from the top of a 50-m high slope. What is the speed of the skier pyrv+4szofd 5j5hv69 5x3 gajon 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 hill with an initial sx- p3lv (q.do4i)jh 0s) zr2tudttm5vpeed of 4.0 m/s. Neglecting friction, how fast p.tl vs5o hm dd0iztr(vxqu)t-42 3 )jwill 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 dowkd- xjifdx +f:wz9 /i5n a frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the j-w/difx+ 5i9 kz dx:fvertical 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 p0ok x26el+,mx0efwju otential energy exactly equals its kxol6e20 m, +k exjwu0finetic 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 from ground level with a kinetica.pa)jnq dusayb i.: d5: vb,5 energy of 4:5anyvp)s.5,a dijb:a qd.bu0 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220 J.9l jr jqd4p2,xv9lnd+4mg9j m At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical heigh+ ,lrjnm4lpg m x 29d9jvqj94dt, 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 m f( ;r lfz+x8mb(-gr 9wz)0:6k; vqt cliywicthe bottom of a dip (See:ki m)xz (cr c89qwvwl6y0;;fz+(fglrtb-i m Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the 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+sb l mwp,-f4q point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speep ws f4-+lbm,qd 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 a dip with a speed oin4suo ank8q ,zk.*.1ruef9a:ytp - af 25 m/s (See Fig. 6-2). Neglect friction, what will be the spein:-4ras . kanf o1u9,. yk aq*teupz8ed of 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 )56v tnfq :ik6gfc7z ,/p sco9ox z7knspeed of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled lfzkity/ (-pobhvoua,t ;461 0.22 m away from the vertical axis and released from rest. What will be its speed at the bottom of itsvyol4hp 6tuti , ak-o;b1f z/( swing?

A. 0.30 m/s

B. 0.80 m/s

C. 1.20 m/s

D. 1.00 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 b6c0yi cy5wa/bnn21 i(gvsw525 m/s hits an initially uncompressed horizontal spring with spring congw(v60b 25s5bc/wai1 cnn yiystant 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 )xta32u)lla+ ps h 9qf2000 kg car to stop for a red light. What work is done by the friction forclxaaf 9h) 2)+qu3 sptle against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a- 9aek0 g eyol1ap eisdve+9-c,-5rjr horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before ca91+e-c9deji-g,keov ls -y 05rearp oming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 q*m sdm aw7.*pJ of kinetic energy. The friction fordp* 7*.wsmqa mce on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.aprb6n335khfk2sd oev a/4 1 m0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a dista 3h nbr65kv1m4 32aedsfp/ okance 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 topt nxx2 tsq7)y0 of a 50-m high slope. If the work done bnt t)7xq 0y2xsy friction is $-6.0 \times 10^{3} \; J$, 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 plane. The plane is 4.0 m long and rises p ; cx2gzqmeha8;*q+d 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 8hx qze;qm*;p2+dc agaverage 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 r 77v. isil(omrest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic frictio r v.77il(mison 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 groubqp.7gdx4wy8 s ql4t4 nd with a velocity of 7.00 m/s. What average force of air f x 8w74s.t4bylp4qgqdriction 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 u8oyc;lb; buf7+b ia- /m hixd8sing energy when he runs up a flight of stairs 10.0-m high/ l8ouim7y8;a-ci dh b bfbx;+, 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 wbhp86c35 9r jmdo9yeaith a constant velocity of 5.0 m/s. What power must be deliveredm9oc 6p ab8r9j3he5yd to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy arekx*yiilx o,les1i,0 8 used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W, i l,xoiyl8x1 k*e0si)

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 ofk5 ll9clx; 45 nfrs1)uxvfudw(/v4 jk 500 W while riding. How much force does her foot push with whwxuck (u9l1d 5;k 4vlfx/l5rj 4s)n vfen she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What:kcb f/ sfe,a6qpq8*e is the average power delivereqp/ak6b,q*ec :e8ffs d by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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