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

1#

What is the correct unit of wox.eu o e5i4e 27ldb ;7bfcnv:drk 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 c vtex 6cp ldv*)+kt*kk yr)(/system if there 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 as 2x vd gg.lyj-+xjx::gainst a stationary brick wall, the amount of work you +vg jj:lsx2:-dygxx. 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 a9m4s0)g j.dpjfirykb08, c cond is being held there. How much work is being done in holding the box in thijyc00o4 8fjd)k bg.s9ipcr,ms 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 10-N obv.frmi 2 e/rr5h/i8)vu s1rddject, the amount of work r2f1e srr5m )rh/vidi8vud /.you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then rgx5/dr 4w7c1xvcj i 1. qsqe4leturned to its original position. If the total weight is 30 N, how much work was do 1qex/7gjq4c4xird w 1ls5.cvne?

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 o9w 0igrlg; .oqsv k ,s8,a+c5hn0fwaxbject 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 uphuzl4g8 8(-ya pmh/so. Compare the sign of the work done by gravity while the ball /l4ghys 8poau8(z-hm goes up with the sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F2 ig2yg - (u.niq0tigb vs. x) graph, representsqty0-gn ii.bu 22g(gi

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), what5n.i)fpfr ++ ghocb*b represents the work done by the force.)+nbbhoc 5 fgpir+f* F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; mv^2$ is

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kinetic en;g gymka, f(p;ergy

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 t8hci50 0c7iw dmot1g a;vz 9gqhe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, tps-n9m51kde v4vu 9)bn.elc qedb/ / khen 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 1l/lrvk2jo. 2 r21hzgy 1a bdbas much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the byb1a g/2r .r22ovk1 ld1lh zjcar?

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 h o 1z8g4pos-zv6tg ww5as half the mass of car K. The kinet1-goztzpgs w8o54 w6vic energy 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 ed +p-abrkbv3*cmz*lk g4 v+9back with half of its original speed. What is the ratio of the final kinetic ene zbr pd+ -lg*+mvc*b9kk4v 3eargy 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 aqvp awe u wh2:6*56xsx speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the br62:whewavxq5 s p6*xu ick'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 wp(2m.wgb,a7pa xew - eith 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 object2,m-7(a.p gap wee wbx 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 cav 1o3 4tfxsm:il.c n(nr 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 h(nc s4x.lif1on3:v mt ave 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 f,5ho rh;07ctaw)d ba9d 1df zan elliptical orbit. Neglecting any friction effects, what happens to tfw7aft90ad )5 ;1hdzdo , brhche 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 principlc25pp jant,s 8e.

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 ener ,*6d ojocuyy0ao4:rj ivv01 zitu+d5gy?

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 h(jlby91lim+ ;a 5scs height h above the ground. A second object with four times the mass of the first if released from the same height. Tyhbs 1+l;l5s ac( mi9jhe 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 ori,bphr 5o7o y rxr-0r5-v0qbf a spring causes it to stretch 5.0 cm. If anprrro vbiqr7 x,ry55o0-b0 -hother 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a syg)2zl(8lbjh8/ti hxd .;r i.m q5rjqistem

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic etvbh2,1ofd.s (7 enb(jadi l1nergy K, to its potential energyed7b nj2to fl idb,a1.(sh v1( 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 ahvyhv:pp93wu ky,1rp4 ry+/x car driving 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 withu 9:udh-dv y(c equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which riseu v:h-d9cu(d ys 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 f/94k de(mjn04z :koqqhgeg8$m_{1}$ 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 eorg --ak/t- rv9sztv1 nergy for conservative forces./rz1tv-ovrgsa- k9 t -

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 4;mgft,kh3ln/ uay* m the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the h fu3 am; ,nlm4*/ygktbuilding?

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 kinet,opb (lkfy (m p*n(v/pic energy. Do not ignore air resistance. How much gravitational potential energypl*(py(f b,ov( /pk nm 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 di-jp*pxmnci(p+9wm4 o+n/v z)wk jg7fstance and loses 30 J of gravitational potential energy. Do not ign )v4m+9pjxpkw n*/po(+mg fcwjn-7izore 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 conservbc ;rw)plrt:t l-kq,uod7q -8ation 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 isw4yax-u s siv r r)*.tcfme635

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 uni k*k7r.oqtr+f vf7 dx8t of 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 is not a unit of powewcj v6 (9gzi bs(1qee 6 cp*2vuiqkh5oxtr1/)r?

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 ir,ani;/+ h 7y wwhb*v*5nfqscn one-third the time. To do so, your power outps ww bfiqh+7y* hc; vr/*,a5nnut 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 ac fne8e,a(wpn o)jg 4;nceleration, 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 th:;jh q y6b-ddpe object weighs 90 N, how much work djhdq- ;y:pb6 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 up in the air a distancdj(ew . zlwr8(e of 1.0 m, at a constant velocity (wdrj zl.w8e (of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is p2 4tg/:f0x;dyclctuy bb9 h.fulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N forctghc2 4f:c;/by.y09udxftb le?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for/hwn ku+- 0thf a distance of 50.0 m. What is the work done t0-+wfn/ hkhuby 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 conqk + dmvn2cw0yyzg(6.stant force of 5500 N for a distance of 50.0 m. What is the net work done o26 (dgyc +m vknwzyq.0n 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 alon4 xer8s w*vj//x jmng0g 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 fruif5zm p i13vh:s:+ eopmh /l5yat slides 8.0 m 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 o, ,hjbn 2fa1d,dqc+q an icy surface (assume no friction), wqdh,ancq1d ,b+j 2,f oith 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 direction of thev ffq +jvug7d:/ x.bz3 force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w:gvq+xjd fuf .v7b3z/hen 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. Thnl)f qo : gb* ,p,oeu9,ns.,eb)pwab ee graph in Fig. 6-1 shows the force versus the object's positolebpna:w fse)g, eq9 op b*,, .b)un,ion. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an objqodrb 4ldh/:hj5j , h*ect in the direction of the force. The graph in Fig. 6-1 shows the force vers5 hbj hol:dd4rj*/q ,hus 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 direc.- hfa,h6odlq :mrb4 dtion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w:ldq d oh4.6a-, fhbmrhen 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 (initially at rest;vc8o):(*b ffmk s d(tmzt3kk) across a 10 m level surface. What is fkob (d)kv:3(m;ctktfz*s8 m the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cg5 - pg7 0e3f6dncllthart (initially at rest) across a 10 m level surfacegt-nlh 0p 56ged7 3lcf. 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. 6mzjc/ -lo .lwbu.e9wHow much work is required to stop the masb. /.-lmljozu6we w c9s?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, hy* y(ccwkuxf) 4sv80what distance is required to stop a car moving at 50 m/s under the same conditio(0yu y wf8)x4kh svc*cn?

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 ism s /dm.eubwn8 .j:sh, ol5/x*kc vke* cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dakcmm *ebk s,8 ewx:ndj/v.u/o slh5.*rt leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal compone5vmhcw m( w),int of 80 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 final kinetic e5(wwh),v cmim nergy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, strig1u4: n0 f. qz nfb+u95tsromrking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stoppinggfnunfs+m15t9: b r rzqu.0o4 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 m/ f 973uf g2 nijzmvao3iu5t6noved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gra nfnoi 3 ufv5/zt26au97ig j3mvitational 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.nr9c/ 1v rwv2b0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the r b vnr9v2w/1cpush?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. Whaj )cly- f2h3vb (dwr4qt is the spring constab24jd (y h-3frvlwc)qnt?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How much po gqo3l:.new kb22;wli tential energy doew.we32kiq;:nb go2ll s it store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress /kdzsjeu6l3x;o9),*jv +ne8 bi cdgu an initially uncompressed spring with a spring cb;9,oujdg / dlezvsn+ )8 3 6*cexukijonstant 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 constant 40 N/m from iw 6jdp,oqn0),aeg5 ex = 0.20 m gj d,oe,0qw)pn e ia56to 0.25 m? (Assume the unstretched 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 spri wnub-a. +ah2wng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress th2hauw bawn +-.e 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 o(c5/af 6zi:k cato qe-m, z/sdf a 50-m high slope. What is the speed of the skier on reaching the bottom of the 5 a k:/cotqea/ szc (z,6d-mfislope? (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, pushvm ogg/m 1 w017yk p,;lmimp7bes off the top of a hill with an initial speed of 4.0 m/s. Neglecting frictigb0mplv om/pgi km;1ymw7 , 17on, 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 frictiontbl2xak asx-7*/ op7q less inclined plane. At the bottom, it has a speed of 9.80 bl-t*xq a7k7 opax s/2m/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 aq+a dpzb ,2p/q9)ad /ftro6oial energy exactly equals its kinetic energy. How fast is it movp 9/,aq r +fq /dot6odpz2aab)ing?

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, weighingkd 5 ms,yt2t)j 10 N, blasts straight up from ground level with a kinetic energy of 40 mtj ,kdsy 5)2tJ. 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. At thebzj a,9js y:udol38,m highest point in i 3zo9aj,bdl:,8ys jumts trajectory, 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 45b2y n g ynz:f5h9fio+7 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller79fzbfi+n y 2gnh5:oy 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 point 45 m abovfp+5ka 1 q7iv;fner,ce 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 above the bottom of +1;r,n5q kpc7f fivaethe 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 twr9z ;ei rz6gf7, r+oa point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the ro +re w ,riftz6g;9zo7rller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (p/ea) u b2;evcgoint

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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 cmo4 hjq2xwuq .s)z1m6n is pulled 0.12 m away from the vertical axis and released from re)o1qw j.2m x4snzqh6ust. What will be its speed at the bottom of its swing?

A. 0.1606 m/s

B. 0.428 m/s

C. 0.642 m/s

D. 0.535 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an iniy0zq nfsthz;:gpamx3 7 +ry)7 tially uncompressed horizontal spring with spring c;p3a )yxh7nzz: rmt+0f7qg s yonstant 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 stfb-wl1zv cayo8w v:x) 9p 8j9xop for a red light. W)9 1-ly9jvbpxxo 8zw8w:fvc a hat work 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 between a 60.0-kg object and a hvhk 1jw,qkx,4 orizontal surface is 50.0 N. If the init,h 4,qkjkx wv1ial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is mov(yc jp:-y(/ wweu*g ieing 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?(/yic wy:pe*w (jg- eu

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 2.07 ioz- g-,6vcuks2fl k, lj.pl-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.2-kl.v6u-f l,2zk,i slg7pjoc0. 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 f/cknmqd0myi 0 4 ft4 74y)qg merh9se/rom rest from the top of a 50-m high slope. If the work done b4m mk)/y i e74tmednr400 9ys/fhqgcqy 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 incly. yk--3+qir 2jdejih25caij ined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was thjrce 5i3-2j yy.hdq2+iik-jae magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 2roh5;+ woy5xb;rmqi+0e above horizontal. The coefficient o+5y5b; rrm+ ;qoxiwh 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 stri yueux55v cq dh+61.zkkes the ground with a velocity of 7.00 m/s. What average force of air frict yuue+hz v1 65d.5kxqcion 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 1ibffnk x2i+ni2+ gt6-kg boy using energy when he runs up a flight of stairs 10.0-m hi2 +i1+ngfiib 2kf6xntgh, 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 wif6 -vijqtz 2p7th a constant velocity of 5.0 m/s. What power zqv-62iftp 7 jmust be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (gfw c(75u6q 2je8lwsi1 hp = fsw726cg j 8equ(il5w746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rateeiqcd/6b e7, g/0-7otf1 bve eu;rm cg of 500 W while riding. How much force does her foot push with when she is travelige/qr beccdt,ib;f6ug v m0177e-e o/ ng 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. Wh jhs1yd.gcg2*r b* c0pat is the average power delivered by the engine? (1 hpb j *1sgy0*.p2dr gcch = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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