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

1#

What is the correct unit of work expr.r d5;abl+ky nnjjm4d;b8g 5aessed 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 f03t ; wlbh fyqh6+p4qthere 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 ,h mcl,6eel h3a stationary brick wall, the amount of work you lech,,h6l m3e do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is m*;z hy,j+ndru ftc ,6being held there. How much work is being done in holding the box in this poy ,tru*djm z,; n6fc+hsition?

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 codx5kl.f8jpn pq 3r6:znstant velocity carrying a 10-N obndpq3k :z.jrl6fx 58 pject, the amount 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 liften d-7f;tsntvz6 7k hd1d vertically 3.0 m then returned to its original position. If the totaldsk7t d;n6t-fh7vzn 1 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 on + /sp. 9)ymcefm-rnjm 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 hp n*wg4z7mr2l olx/7the sign of the work done by gravity while the ball goes up with the sign of the work done*z2o x7ph4wl gr7l/ nm 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 cs6 6yialul5 uws* 9l5)q2r etturve, on a Force versus position (F vs. x) graph, representstlrsq)l69562i5* stwuea lyu

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what rra2b8 f1 7vvjzepresents the work done by t2fvz7 aj18rb vhe force 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 energmh vghwsu;;87+a/di l y

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)o- n 1*i v bgrezv2j-vdn rgon9hqg0-1rj8-h , 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 object is zero, then the object's kineti)rcdh /m.x6 jyc 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 t2w 16;xa5scce u5 ox:pye4b qzxo5p(rhe speed of the car. Which statement is true about the truck's kinetic energy compared to that of theseacyboo6x pwup 2z5e;1( c :q5x5r4x 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 tt8itni,s(z3l0hs) y ) vef(xas car K, and car J has half the mass of car K. The kinetic energy of car J, compared to vzt)s8) hii ( t s(fynxlt30,ecar 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. Wha3r7ehhx,gzy5ro 9f f4t is the ratio of the final kinetic energy to the initial kineti hfgrfroeh9y 5,7x z34c 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 cd+0 utrsmznv xtb(93p+0a f9 of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the3tx+ c f 0mtr0dnb9vs+z (p9ua same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with sajd vxsk;sh ::7v1 vw1peed 4.0 m/s. Both objects encounter the sams vs:1;jva71kwvhxd: e 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 carrr3i7ak x; ) 0uxi3 4fzms(ovl 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 have ;l7ix(3k34 ofx r)0zuvsiamrskidded, 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. Ne b/(7gods* hg r8ul0rpglecting any frict ub7l*sr0 g8(pdh /orgion 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 princi x,. :av3pvqciple.

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 hmrim/n r+k:)r nf c *g tg*9.x9ot(egpotential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest bh6r;h.zbc a 7a height h above the ground. A second object with four times the mass of the first if released from the same heighzr;ha.6c 7b bht. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. If f+;x(l tf.uh nyb ;nv7i5ak-m another 0.200-kg kv;bf5ilxtuy(+f-7an.nh ;m 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 enx6 v3pslcum5 *ls(,+d1sio kcergy 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. Comp .*k 3qh0gu ;ifi5wiip9ztf9dare its kinetic energy K, to its potential energ fh it;09.df5w 9z*3iiigupqky U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hillde2g ubm1 ;,7kv8jsmy.

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 heavyzo7y+q48f1jg (5cepv oac: e)-xwdz c object are sliding with equal speeds along a level frictigc :fwvcj4pxa cqzo1+ 85dz7oee () y-onless 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 jyw; r 2qsm3r6z1kk3ctocr7(mj0 r c +$m_{1}$ 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 mechanq 1*xsnxprs9n7t7* a(kco n9vical energy for conservative forcesss 9naxx1v9tp q*nn c7o7( *rk.

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,xx3e1mtuf1ny j 6)t2 y through the air (air friction is present), to the ground below. How does the kineny 2eut3x 6 jm1t)y1xftic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not; pn.vuej-h e5b4pmh9g1 vlz ) ignore air resistance. How much gravitational potential energy di hh14. p )5zm-vbpgnu9el ve;jd 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 gravitatig6jfn2xq) ng9yib:oec sk, 5a:) vx0monal potential energy. Do not ignore air resistance. How much kinetic energy did the b g:qy5m nejfvx)skxi2n) c69o:b0 ag,all 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 conservati c +q5b6zrn6hdon 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 ism8z:zy12zfk ,e mn ex8

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 unij *:f mp ecka*, .wsl-yn81yeits?

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, whic) dje0i/1 tkzsnq):buh is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the u ,mnan1i6*yg work in one-third the time. To do so, your power output mnan iy*1g,6 muust 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 engine musahc ,)pv/k1trt

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 hek/o4r n a7rqfawii5)/ld there. If the object weighs 90 N, how k45qiia/7noa rr)f w/ much work 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 sfn:s (7jypr5 a constant velocity of 0.50 m/s. What is the work done by the weight of the b5 :pnjfyrss7(ook?

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 pq26 gxtk zgs.z82a r,lulled upward with a constant force of 5500 N for a distance of 50. z2z8l g,2.tqkrasx6g0 m. What is 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 with a constant force spob3y i xt,1t:5/i4o :ajplp of 5500 N for a distance of 50.0 m. What is the work done by the weight of thp:t3xo jps /a, liyip1bo45:te elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of qsq4 1gvcye+;amro6,5500 N for a distance of 50.0 m. What is the net work done on e4+ gq6r,aso cyq1m;v 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 alosw24kfhja l2 d 1v7f/7bh8 rlxng 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 8ga2 : p ujzj1, tqvsx0am/m**d.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 lit d 8ubhe4k-q3ytle sister Sarah in a sled on an icy surface (assume no friction), with a force of3-ydhek q4bu 8 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 the force. Tq s7.s46 sossdhe graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesqs.ds7ss4s 6o 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. d6 7ndml+e3wnr-l4 dc The graph in Fig. 6-1 shows cmd +w7nd-4del r 63lnthe force versus the object's position. 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 object in the direction of the force. The graph in Fzvkku up m-i54 ;2-jun ah11ohig. 6-1 shows the force versus the object's position. Find p5miukv n4o-k1hj-auh2 1; zuthe 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 t+d. 7.5f; - ;- fu tnogwqhjzw6qjpo4zzhg7lkhe direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh;hww zzlf oj o7pt-hzqud.-+4gf;kn.5q 6 g7j en 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 (inizvi)b(- xek8 etially at rest) across a 10 e-e vbix8z)k( m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially a0 0*4pijt*.msfu 3knvw3iie tu p qs*-t rest) across a 10 m level surface. What is the final 4u 0-0ituj3*. i n*q3p ef*simskvwtp 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 speej+1 opt) (ar.nc3 ugo(akn1 kqd of 5.0 m/s. How much work is required to stop thea nq )c1kna (gjr3k+o.(1outp 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 eu c-t n4-nb;y-h 91nv c,pqzfis requne,bv-4htyc n qf-n9u1p; -zcired to stop 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 p7 3+bs)v :m/xxrp;x-nd rle 8n2scs xlropels a 10-g dart. It is cocked by exerting a force of 20 N over a dis8rm7dx xs/r-l pn)vn b2ssx3ecx :l;+tance 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 80 N and a vertical cs(y5kcs ;8d7 hv7at zaomponent of 60 N. The force i;adzskcv8a5t yh ( 7s7s 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 of hay,2vb ) i)ebcw 4jy 3ot)lh9t7nrkok glv2 pp2,* striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stoppiy2owh)7ell) o jb2)k4p9cv* pgtnr,b t32k iv ng force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to ae,1k )y0;m 5 omvsbtis height of 13.0 m above the floor. What is the change in gravitatio,0m1seb)vm 5okty; sinal 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 plan) x(fmgte9; hhs -0bh )qgng90od. hixe is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work wdo -sh(g9 n))f xmt9h0gqx hehi.0bg;as 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 spriny *m p3q:bbj;rg, causes the spring to stretch 2.0 cm. What is the spring constant pjbry:bq;*3 m?

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 b*b m,ko3mn+3wl+y g5 ,ygc tfpy a spring constant of 60 N/m. How much potential energy does it store, when stretchedgnfcy mlw+*,+t3g 3m,5pyo b k 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 initially uncodccxnju5h:h i pi,+ 88mpressed spring with a spring constantdh8 8c,huj:+5icx pin 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 ; vdez3j ++ qvl:lge6ca spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x v:j;3ll6zd+e cq vg+e = 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 compres+3:muj*xvrxbv h5s ,g sed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cmxh xs+ ugjv5r,3* v:bm?

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 high sl*thw.lo1 +zimh 5z ,rqope. What is the speed of the slier on r+t h. z omr*wl,qz5ih1eaching 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, pus42l gkov)t zmda 1k6s u comy21/vnj0/hes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in dn1v/0 g6su ym/k22okmao4c j vz) 1ltelevation?

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, it has a sp*4f* wq ed wds- i+.fdpj;)tyheed of 9.80 m/s. What is the vertical heiw)fhq *yti ;f-*.dj4wep+dsdght 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 nzj;;)qq*lxt4ed6k la/4 nfd is 0.70 m above the floor, its potential energy exactly equals its kineqf )zn4t*4 6la;k j nx/;edqdltic 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 arakm1qk ikqv*:qi4 5-wmih5 - kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what verticalii i vmk*4r1qk-wk5h5aqmq-: 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 w4ocg/n0b xhw/t a.n ;rith a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its .o4hb/xnwn ;r act0/g 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 froml31201v t,0mds gnkyqrs s p0z rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will lyt1k,30 2dp0sv0 szn gsmr 1qbe the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.r*- s7gz/n syq0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip? sq/r-7sn gz*y

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 bo(fr rxr je9b-4ttom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at b4rrjfr 9-(xe 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 fw cs/,k0nzf* 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 30 cm away from the vertical axis andld, n3j) t 9h*r*ngvooo63ond9b/foz released from rest. What will be its sdo*3 v/*j6n f)ot 9 nz39ooh,bnl godrpeed 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 +ug7 lmpkn1y.initially uncompressed horizontal spring with spring constant of7 mky +lgnp1.u $2.0 \times 10^6 \; N/m$. 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 6lfn *)+vdf v5cdp+dmvv7 kc +22 m/s, slows down her 2000 kg car to stop for a red light. What work is p+mnv )fvkc+ d6dv 5c+d*lf7v 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 objex(j2/c9dl uy hct and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what 9cxu lhdjy(/ 2distance 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, level surface. Itky7qi u( 07to. l)rvr:i3lpbs has 24 J of kinetic energy. The frictioir0 r yqo()i3:tl7k.b7 plsuvn force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on admzn i*e-k7/lwz q*- rqrjr(4 level surface. 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 changer7-qj rwl(m-z**/kenqr d4iz in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of i;jd4 tbj -y+hdks*i- a 50-m high slope. If the work done by dyki jb; -jtsidh-*4+friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4jd yq-0r1f8 ;m9cz ozz.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 wm-zz0ofyq1cz j; r9 8das 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 ofmpkzu*4 m4+bl a plane inclined at 20e above horizontal. The coefficient 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 pl4ulk4 *b+mmzp ane?

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,;o: aec nfd2fvvg 5a;, and strikes the ground with a velocity of 7.00 m/soc;an2evf,afgdv : ;5. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boyx2(vn re).:wt6t gz ks using energy when he runs up a flight of stairs 10.0-mwsn2 rgt ev)kt:6 x(z. 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 t y3q q5lpwauoi3k.0o8o move an object with a constant velocity of 5.0 m/s. What power must be delivered to the objeyow.8k0lqpaoi3qu5 3ct 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? (1 h 4h2)da1to9-e jsizf2ra5 x myp = ms1h2-d5 t 9 i)4aryfzjexa o2746 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 mi7 xqu2y5 hih8ara,b n.mk27ruch force does her foot push with when she m hr k2u8i75yq2 n.h7iraa xb,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 7hfi g2rr 6.n:s vgmk*8.0 s. What is the average power delivered by the engine? (1 hph6:v rmnif8r*k.s2gg = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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