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

1#

What is the correct unit of wofy)7o8y7uyh hrk expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if rxri- .nj13njthere is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary r3mov: vt qdm,dy;;d3 brick wall, the amount of work you d,;vrmd 3t3v dqyo:m;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 lif gb7a.qyxcoc---a bkm 4;:foc ted 2.0 m vertically and is being held there. How much work is being done y-b k axc-4:bqcoc.m7 g;-a ofin holding the 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 constaqq+ nb7pdw 0;;gjh2t wn6-qke nt velocity carrying a 10-N object, the amountn q+b0qh wtwd pe7g6;-;kj2n q 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 m then returned -hmraltt9 ):f to its original position l-mr9:)hftt a. If the total 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 . hs: a-dbue ub4s/yj 0ypg+(ydo 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 work done by gravity whilv0q z- jnn.*zqn0h3 jde the ball goes up with the sign of the work donen0jd- j.qn3h0 vqz nz* 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 (F vs. x) graph, re(nk 4wo2)z gay jaka(2presentsa no4y2awkk a(j2 )(gz

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 po+llfa q gf47b;sition (F vs. x), what represents the work done by the force Fb 4fl+7al;fqg?

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 enerjze0 mz7p55olgy

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 isxq c9z5(dr 1lr negative, 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 objecgr0fvy;q ha)rn ;f-; qt is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed o1 xdyjlbb+up 65hk)d/ f the car. Which statement is true about the truck's kinetic energy compared bl6)h jdb/5d1yux k p+to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car lr 4f+aum *-vw48d53khq w8e u 3rxsdsK, and car J has half the mass of car K. The kinetic energy of car J, compared tm3qrk*85esusx3lr4a8 u hw fdv4- w+do car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its original speed. What 9z va4kqwnhef s)h +:r9v*rv: is the ratio of the fina9a)k:h+ 9:qv*rs ze4nfwhv rv l kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m6i qkgu egfrgqer-1*0u 21e*w/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 brick's mass to the rock's k2 r* qeq*gi0u- euw1rgeg 6f1mass?

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-kbm h)fo jglax 5pfp t.anw9/8o4+i.od *h z)r)g mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which m*fa lph+nbo.wix.tfh) a4 p gr/z8odoj)5 9 )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 brakesl0hyvmuk bz1/ enr xocel(f/(a8*,,e of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as faec,1khy8( eolx zbn/e*m,l v/0 (r ufast, 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. ,dazhpiyq: j*v4d+ c; Neglecting any friction effects, what happens to the planet's ki h*pjd4 y i:aq+vdc,;znetic 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 princygrzd c7 3(a8: azzs4biple.

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 energygg*a j7-idamgv5 p(lr59/n:ho- mxif?

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 s3 ;sjwq omnx40:bclff;e: 7 icecond object with four times the mass of the first if released m eo b;i:cxl03f;qw sj n7c4f: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 s/.,kb4gp gri evl:yg -t oz96opring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential ekv b.o -eg ,potgr g49yl6/zi:nergy 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 energ3d;zr3;ynm 2k*fzf woe )r+xm y of a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. )8 7 bg vxffrg3-+xfs;d s,ece Compare its kinetic energy K, to its potential energg8;x-d e7e)r 3bvfs, fx+ fgcsy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car drivingau:17e3glqr d 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 vekcgycd ,j 7v90ry heavy object are sliding with equal speeds along a level frict ,0gvdj7 ykcc9ionless 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 z9axo/, at*zt(bsm( u1 4ibik$m_{1}$ 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 conservx ;kk;z1ie2 rdz 3jt n.t7dedxz.l-.r ation of mechanical energy for conservative forces. .rrtxdt1e2 ;jl zzdiz -d k7e3.x.n;k

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air a/.33l2r mmtyyeb4b g (air friction is present), to the ground below. How does the kinetic energyyraemm2.bl3ty/43 b g (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kineticmqx31- fe z,ig energy. Do not ignore air resistance. How much gravitational potential e31zm,xf gi -eqnergy 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 gravitati.5ohenrgw5ekn4 -/ laonal potential energy. Do not ignore air resistance. How much kinetic energy did the k5 ewhrong/n l.a-54 eball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of ene 79*rwyl5 tuforgy.

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 is. qse(ht 7u2 / cx+)kaoq:ktng

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 i48yg j-,ix zmk 7)pxwza7lt6t n 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 vabtn jy;0qud 5uv1(s* b1m,pis 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 7,bod rqus;h9xwe 3v3the work in one-third the time. To do so, your power output must have rx9d 7voeubhq3 w ;,s3been

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 constae33t78. . v qfmil7ln hmi(miqrdsv)8 nt 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 wp3z,;kruox :zjz5+c ahasm+u( es/d 9eighs 90 N, how much wo+rx j( pd5+eu sma;azcz hkz 3,u9/:sork 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 distance of 1.0 m, at a constant vek iller5(oas 9 / bjniwb)btnb)*r36;locity of 0.50 m/s. What is ;eil9obswr) ( )t j*nk 3nblar 5/bbi6the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant*r *sc 1vvlx6f force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 rsfv6l1**xcv 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 constant force o.uv tzoilrx: 7; zgm70f 5500 N for a distance o7l tm ig:.zvx;0rzou7f 50.0 m. What is the work done by 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 puq / xaz (9z;kbj(4bsrllled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work dona brql4; zz9bxs(/jk( e 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 to1f0/u(s i r ng7weg,up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit w stmx 7axd..9ix8et*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 an icy surface (assume no fw09enrrgtj h(2( i:jyriction), wi2yj 0ejng9w:hrt ri ((th 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 d xd y(lu ba20dnw3/c-qirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done(uxl2 3byq dad0wn /c- 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 objecaq qj9eh3q 76miwv; )pt in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when ;a9wqq 7mvq 6h3jiep) 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 force. Th2bazy;.h *,ykzzczl (e graph in Fig. 6-1 shows the force versus the object's position. Find the work d 2hczyzl*,;.byk(z a zone 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. T. v3l)wq8(bs d4;l; tqhqxho n9jdq 8rhe graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.08h4hr(qq3j.8l) ;vnl ;9q qdts x wodb 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 c, *j7 brxg(f /+ ptj *9y)lgffb9vfkh55-kg cart (initially at rest) across a 10 m level surface. What is thelf)yc9*ffjtfpgxb h*r ( b ,9/7+vgjk 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 cart (initially ahrqv 6;tn+e -st rest) across a 10 m level surface.hn;t q-se rv6+ 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 wp *jy) 7 nlzj+os1;ylaith a speed of 5.0 m/s. How much work is required to st zy7;a )po+* snjjll1yop 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 ich v+ 6x47hkwbnitially moving at 25 m/s, what distance is required to swhxh 67+c4v bktop a car 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. It is cocked bqbvy;7 yf;p ;ky exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming t k;7; yvfpq;ybhe 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 80 N and a verticaln)4ypj:7as,i z 4mux3vgq1cc component of 60 N. The foryv4u1 xi7pgz)q :nc a,j3c4ms ce 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 energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale o( mfy d1zze *j+l*55yd8is pbg,xqyu*f 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 om*du 5s(iy+5*l d gfpxyz by,1jz *eq8n 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 height ofvl2 ijn+ps6;q;)bvv l 13.0 m above the floor. What is the chanvs q2v 6nj; +bpv)li;lge 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 wof t tzedep;-:4l*i0 plane. The plane is 4.0 m long and rises 2.0 m. I;iz l:eed tw-o *t0p4ff the plane 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 sprin 1s6-j3o(s vml*u(yr pey r0tlg, causes the spring to stretch 2.0 cm. What is the spring constyt -l6l(ry1 ro*j mp0ssevu(3 ant?

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 consgk auf r-jy:6y7p ab48tant of 60 N/m. How much potential energy do-b: g 76 ufayk8yjpr4aes 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 an initia0 -tjb0rbv jqoa63t 2hlly uncompressed spring with a spring constant of 25 bvjt0h jto23 r a0q-b6N/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 ofe bskw.7zj 1mnt;(t gyvr ou+r7 q-t+) spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the yre1+jm7t u ( .wzt;t+n7vr k)ogqsb- 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 spring constant of 15 N/m is initially compressn0, w ;up7 riq q)njqu;njn)1ced by 3.0 cm. How much work is required to compress the sprin ;1)pnnc 7 j;nqqrq0 njuui,w)g 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 do( 9hdyva*oxp 9t4n 0high slope. What is the speed of the slier onvxtd nph9a4yd *9o0o( 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 t.+ 4jgeoj os-mop of a hill with an initial speed of 4.0 m/s. -ogje+o4sjm . Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plajqkn.7f y g9f(ne. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of tf (kj.f7qg yn9he 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,szcv ft*azvj *6k6 y5cctn i:h9;e72 s its potential ener z*svcn:7t2ih*s av 65yj;9c kfztec6gy 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 lx(;1lid p0jd,ob b5l/us/ (naxk, zxfevel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does itix f;bb/lnj1( o(5zdkp/ xa,0 dxl,su 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. 3l4smug3d r/h At the highest point in its trajectory, its kinetic energy is 120 J. To w 33ldm4hr s/ughat 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 z 2a5ib/ j-0+fepx xoqgpppb,7 r1 j1oabove 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 isb xbj ipzoppxej,-o7fq/ga051 p + r12 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 above thrlwo *;pf(a3kg7gj :ibu;:f, ae n 2bae bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastel park(gafb guw;3b:;*27o e:fni, a jr 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 starts5tggvv-lf) h nwkx;+g v 92j-kk6vy-r at a 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 rolxng6-lg5w;r2fvvkthj 9k+)g -vvk- yler 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 ,fu kab/e1t:bof 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 pendulum of length 50 cm is pulled 3onxzozl( mdw2qz:-haf doh0p 7 83o660 cm away from the vertical axis and released from rest. What will booa-p z76ldznxo:mwz6 dhh382qo0( fe its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initiall5k 5.an,s /bcs g.,b0iqudqto y uncompressed horizontal spring wskqubsto d.. 5 b, ,na/cgi5q0ith 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 he:trt5y ) nu u(demu(v7r 2000 kg car to stop for a red light. Why udu5e :7u(n vm)t(rtat 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 betwehq3 gxb*o y8 as:uv10j8 3uvcboasr/2en a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before comig8aacs2o18vrhbv /oxj:uyu0 *3 q3sbng 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 er e(4sqtaxn-2w du.5c2nv i0rcber4 c+z-.c 24 J of kinetic energy. The friction force on it is a constant 0rdrw 4.n-re-ccs 2c .e5u40v cbx+( enq2a tiz.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 2.0-kg mass on a lea zlbi4k9u,8oy.q mkmkl: o:(vel surface. The coefficient of kinetic friction between the mass a:il9m:kq8,u(k. y o4 zoamblknd the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest fromjf;h g4 lryzb1xmk9 /5 the top of a 50-m high slope. If the work done by frictioj; 1yz4mklg/rhfb5 x 9n 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 plane izl6vv4)*l- m;kgko pss 4.0 m long and rises 2.0 m. It re;v *ol skk6z4lvpmg-) quires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20mv8erb)4 ( 81u1dq)3 hma wn)xff omjie above horizontal. The coefficient offvaid)mrbxo8mf jwuq18e3m)4n ) 1( h kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground with:aj6n0a y.hr- ue( ccj a velocity of 7.00 m/s. What average fornuajc.ac6y(e 0hr :-j ce of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using enqn ubqk41rgw *6s-oj 2ergy when he runs up a flight of stairs 10.0-m high,4g6orsnqq bu*21k-w j 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 w) vs shihf.8,gith a constant velocity of 5.0 m/s. What power must be delivered to the object by svg8shi., )fh 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? ((yno/su k )yuz cv,(b+1 hp = zunob + c) k(,yusy(v/746 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 rate of 500 W while riding. How ne75)/79i tnglta cgl much force does her foot pushltatn97l7c n5ge) g/i with when 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 averagekn(x. l ijk7f jdrr: vl-8o43b power delivered by the engine? (3nd:v8f r4kjbl.r kx7(-l o ji1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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