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

1#

What is the correct unit of work expru+6 w+szq9q 5zyl)zzm p+e;+ n3opkp pessed 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 xzo;c.y4 bpv*srh 2mcjp)i x )j,b17y no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amounta+y*v+ opi pz2sw9y.i of work you dop ypyo+.i +9iwa*2zsv

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 verticallykzy, e96)f;8cvystlq 5 rat-m and is being held there. How much work is being done in holding the box in this 6sat y-vl)y,emcrt8 9k ;zq f5position?

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 cu4vozi r bjgh0r(8 7;garrying a 10-N object, the augo0rhvrzj7 (;ig 8b4mount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 mln qj3p,4 kv4n then returned to its original position. If the tot4p n j,34kvnqlal weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work ooqrxq r*51a x8n 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 theyv30 fs.n gi;d work done by gravity while the ball goes up with tf snigv3y .;0dhe 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 Fo0(3;fnarb 3xrecyn5 b si 1gb8qh25u orce versus position (F vs. x) graph, represents in 3 5bber3;05nuxg(aor1sf qh2cby8

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 v) :gd qrmu9n h)wrnz,9ersus position (F vs. x), what represents the work done by the force w,r hm:9q9nzud)gr)n 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 isjp bqsdh jqx+ 7k3 tk(/1kodtc. 3n0.m 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 object's kinetic enerea8f4a )wphpa5sm9 . k ah:so /b, uwwqd:f;.ugy

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 kinetic e9u 7hi7r8gv4pc 4j/e hfx1ge3vymvw 9 nergy

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 movin- h l7vhp/;b +hk9ryi5 rt,poqg at twice the speed of the car. Which statement is true about the truck's kinp hoh+rb5;7qv,pli hy-/r tk 9etic 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 asf1nr +ei p1,pg car K, and car J has half the mass of car K. The kinetic ep1n+ir1p fg, 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 back with +fj7crh; hz8 yhalf of its original speed. What is the ratio of the final kinetic energy tfyz;rcj +h8 h7o 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/ssvss*p vmjfzf95- uo:*/kc * j 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 br -*s5jcj:v/vk mfu9*s*zo f spick'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 spe+*9 j,xk,stqqx mj 8ewed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. 8xq ,ejswk,m*t x9j q+Both objects 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 d 9.dh2u/p5txx*ue k)5 kv4jv a jj6nviistance on a straight, level road. If you had *9vjav )xpi/ j.u2du65kth5jv 4nkex 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 mass orbits the Sun in an elliptical orbit. ivh4y4b (hza0Neglecting any (4v ha4y0bih zfriction effects, what 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 principle *5qnyhmql1re19a 5f 31yhypt.

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 energyi2bbz pd3o8 ad,c.lnf+ bn r6,0g *rxy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objdj6/f;cy tk+7yt r *2pns.ipgrsp : 1aect with four times the mass of the first if released from the same height. The+2rk:1s diaspr pnttp;6 y7j.fyg* / c 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 causeso9.8pcp2vtz l it to stretch 5.0 cm. If another 0.200-kg mass is added to the sprin.pt z92pc 8volg, 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 +lw0lslw7zi+b* *gioa 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. Compare its :brkp3ivucw8fzv i 7 +l1 8d-fkinetic energy K, to its potential energy U.vr+c:7z1i8dfvwpl 3-f8ubki

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 jf14x9 /r wx2vsbbw:p 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 spee8 bw) u 3vvh/n7 5l/xcacsydq5ds along a level fr h)/qaxv ul5 vc7nyd3csw b8/5ictionless surface. They 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 3s930jqrm ngq75mu cv $m_{1}$ 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 f1+f 7k0iqyu g2efb-bko6 - oze9voxp: or conservative forces.769 f+0i-bk o exq1eg2-zbofpukyvo:

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 2m0 ) gznwf)phbuilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) j)wmpfh 2gz)0 nust 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 k je l9bw+sf4w;inetic energy. Do not ignore air resistance. How muchb94wjf lew+ ;s gravitational 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 and loses 30 J of gravitab 9muski7wc ,)s8gk4 ztional potential energy. Do not ignore air resistance. How muc8g bkssc7 m zwi9k),u4h 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 conservaszf;3 ,,d nwh1c+6 exr+r hgbo) tf(ybtion 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 isa5yx 4zo1+) mi8 blw(16ofm epvvg9fw

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI units?k(xuai uq5./kc.y5.l n ec:por-n8xg

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 unekh1aumq-8 i5it 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 timesiy7u/ fs z vwp+9dk+6d the work in one-third the time. To do so, your d si wkd 6p/z9+u+f7yvpower output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engifzr5 s:-ehs -fne 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 wei 5cibs;u(w6(1x,z.i pucs esv bb09 ndghs 90 N, how much work was done in liftiic.uv wpcxise(0z6;su 5b9 nb db s1,(ng 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 -piwu:4j-bcti qmj fc+f3lfv+y6..m a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work dony 3+.jcp6l wfmtf-ic4u.if+qmv- :bj e 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 p dh-:t9pg u2tq5 v.yckulled upward with a constant force of 5500 N for a distance of 50.0 m. What ik 5tp9v .qc 2y:u-gthds the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward wit l9(*:d e/fmi3ahi zqbkxqx 8 vw4a;8mh a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the em8x8vx;mq f: akdq 9zile*43/b(ia hwlevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a dists6 v t-m9ufv m;0knvuswd+k o+z3vl9.ance of 50.0 m. What is the net work done on th sn+6dwmsk -0 vm9vk9vtf .l3vu +uo;ze 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 al21g( yj7dlw gnxk lfg.u5 u-(jong 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* f2yc6wgzudiwh: (a/ximx+4 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 eh(;sb0k7msz ika/ v(sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an s ak/vieh0kmbz(7;( sangle 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 3/gw g/73by8zok+cr toqpvb5direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2 5wyzt8cqvpok obgg/3 r7b3/ +.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 graph in Fig. 6-1 jibj,26ea. olxd:l; :m frch( shows the force versus the object's position. Findol:jcej6lfh bia: x2 .( ;,rmd 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 object in the direction of the umi0dhw c2g/pv * +e2lforce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movdel/g0uhi2m 2 pc*w+ves 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. Tm6g5ok: f8*sgnr bch/he graph in Fig. 6-1 shows the force versus the object's position. Fi5f k6c gn*gom8 b/:rshnd the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 Nvhh 6y9d+ i/qukl- 1oo is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the hhik/ - v+qu1lo6oyd9final 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 ekc 5w/8s lb(tqvhw7. 55-kg cart (initially at rest) across a 10 m level surface. h(q5s ce8/wk.lt7wvb 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 spek5 js: 9/tshix6j 6u;pgee8siby92v xed of 5.0 m/s. How much work is required to stop the5xjpssy; 6/ ekjs62gevi: 9u xtihb98 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 moving at 25 m/s, what distance is r (d;xq ab ik7n9)v)dj8pq,ga required to stop a car mo;g aandr7jp8,qd)( bkx9)vq iving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by eocv*,v v,at(uor;re6 xerting a force o(v, veuvorco*;6,tarf 20 N over a distance of 5.0 cm. With what speed 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 horizontal component of 8* jw1 fib.h*ry0 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The carthywi.r*1f b* j 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 hb (*l4jnk21x c85nuofs m(g1fkh qr9lorizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates f xf4(r51 obq9g2n1 l*l8ckhukmjs(na depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is mtgc aa/ qivl-*+*s4rcoved 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 gravitational potential es+c r a*a-l*4qitg vc/nergy?

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 xpuq:u;f sf82w q:d +man inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plan2dum qu: qp: xwf;8+fse is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spri(jy-uba46rt)qbc : ud ng to stretch 2.0 cm. What is the spring consta u( qt bd-4uj)6yr:bcant?

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 awhqz1ox8gq e2.;*o i,b, upbq spring constant of 60 N/m. How much potential energy does it store, when stretchezh xbb,,w.q;8 ep2*g1qo uiqod by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an init3z2-2odkhu6ka)rwfsh ef/gq 7 fuc, . ially uncompressed spring with a spri2-ke,ugwhsf o)uh/ 3q z7c2d . r6affkng constant 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 spieo9q4 j6s gr/ring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positigi e4jr9/os q6on 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 ut: ra/tx8cf: y)ud x2rag7u (15 N/m is initially compressed by 3.0 cm. How much work is rt( 7uyuc:):g8aur rxxd 2ft/a equired to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m hb x 0amr2a/y4vigh slope. What is the speed of the sli24a0rm/abv xy er on reaching the bottom 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 top of a hill with anefifr 574p46n mqld/ rfh ob0suo (0j5 initial speed of 4.0 m/s. Neglecting friction, how fast will sh ehp7fsnilofq5u00b or r(d 644jm 5f/e be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At the bottom, i8dz 7in o lny1v7su euj*7)6adt has a speed of 9.80 m/s. What is the vertical height of t77u8*ay dv7einzu)n 6jslod 1he 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 thidkzuy;6,1 j 4 c vt7atz,wm1pe floor, its potenti y;6 ,14czj,utw v 7amkdtz1pial energy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level with a kine6 /jmx qicv8.atic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it c 8 .mvi6qj/axrise?

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 wfofq/z+0qr)h 5ug+xy ith a kinetic energy of 220 J. At the highest point in its traz y0frgq )qox/h++f5ujectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a dip ut(;.t: o+nh-dqc bzm (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the toputm.nbcoz;+-: qd th( 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 pointu)-de q)hbku vgld41+ 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 30udk-u)+ behlqv 4 g1d) 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 speejxdn , o/6n*0wf*xfm 2 tjijt/d of 25 m/s (dj2 *f 6m i o,0*x/nw/fxjjtntSee Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of 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 the4sply:eb4o5-n 3 z cge 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 pendulum of length 50 cm is pulled 30 cm away from the vertical 4r+g 9c,o7+h xxkbkyl axis and released from rest. What will be its speedhbg lk7k+ ,yoxx +9cr4 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 hi ,qyqxy feju;,1q+ja,ts an initially uncompressed horizontal spring wafqyyj,+qj ,xe u;,1qith spring constant 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 .,.zp5y5 )xsnqwvs jdy 4 tzi6kg car to stop for a red light. What work isyjvd.4nzx tqzs s5, i)5py6w. 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 horizo zcs1 qj3-bsp;ntal surface is 50.0 N. If s bs-3cz;qj1p the initial 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 moving on a rough, lmzq2cef+,ir8 e 4d2cvevel surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How rce4dvec2+2 q fm8z,i far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface.bbz /9 *vnqed4+f,i z udqg1f; The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its/ dfqzg,nqdzvf;b4u b+i1e 9* 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 frouo eh.y is)3eb9a.cpm; 2fo, am the top of a 50-m high slope. If the work done by friction.o;uf. 2ep 3ayaeisb,9 ch )mo is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plqsrk*08gxz totsrx70f*4g3l q) -ztvane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magni3)ggt **qr fsr0 szl8z0tq4kvt-o x7xtude 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 ..6n4p o htfv ycik(z;at 20e above horizontal. The coefficient of kinetihctzi6;4kf. p( ony. vc 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 c)+8ui lby; ,gxjvp4p10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it jc 4v+pil8 ;gbx )u,pyfalls?

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 uu)4nv m:(nvv 3.qxy fwqfd 5*rsing energy when he runs up a flight of stairs 10m()nu n*q :f5xvd wf3rv qvy.4.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a conj s j0zw(a x2a)6qvs,lstant velocity of 5.0 m/s. What power must be delivered to the object by the forsv 6j zq20w() ls,jxaace?

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 env 3-)lp kgft4q l8aza8ergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 a4 pll8 kt8)f3v-qazgW)

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 dq0iuzfm 7(ht7erz3 / (xu 8ky5d lsa3while riding. How much force does her foot push with whe qt h3ds7re(0uuif(d 73zak x ylzm8/5n 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 is the average pocf (rb-y,/okd4g -e h4ow t0jh);ps pmwer delivered by the 0t-4-; jg ompp o4khhs,ebf)w(d/ rcyengine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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