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

1#

What is the correct unit of work expressed 6t-6e/j n8rn.lxis yl 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 no motion?a .cl.7iwbq4xg 9wju5

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 stationaryu v,ldiy *5me7 brick wall, the amount of work yol7 e5mvy id,*uu 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 mpm 2,o*tq xl *8d.xhpvb.x0vu vertically and is being held there. How much work is being done in holding the box in this positiou*.mxxvv , lo. q2t0pd8b*px hn?

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 z). o ,yg rba5yem68faa constant velocity carrying a 10-N object, the amouaf yoge,ay m)rz86b.5nt 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 lihdn kly8yzo +jsppq/b()ob*v3, .e2 mfted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was * )k.yszd b8j +lo q(,mnbh/2pyp3voedone?

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 the*h(1nxz0vv 3 ua ue0sr .;)czk7o ypyt 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 sig 43ewl5nr cu3xn of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes cx4r u3wenl35 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 vsu ;;,zp:ny6a0t/ ep ina1 ebfx. x) graph, representsexnapz ,i0tu fyne61;ap:b;/

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents 9g)c6:vbl ,m4a o,c wk/zkbzsthe work done by the for bv, :/6b) cmwslaog k9c4,zkzce 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 posi/3p r/pj:f.w faum1 dytive, 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 objzfthsv0c; 8k.8ovfv4 vt/ j:amn0 eo)ect'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 rpc126odr tdc+i11jx id8mutl/o .q9object 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 tyl-kuwl9n q y96, p8sihe speed of the car. Which statement is true 9 kl uq9-wn ,liyyps68about the truck's kinetic 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 as car K, and car3vuh1 4z* bog/*ida4 kjzeln+ J has half the mass of car K. The kinetic energy of car Jja/ezunb*d1l +ohivzg4k4 3*, 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 halfjv ki4j2v,u h+ of its original speed. What is thh4jji+v, ukv2 e ratio of the final 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 m/s and a pebble is moving at a speed of 5 :s*jhlf9 kp (ozkfzfj+b+ 98tm/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the roc soj lk 99f(kff+zjpzh8t+ *b:k'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-m;;riz vp;clc px1ll /45 +cc kbju:m-kg mass is moving with speed 4.0 m/s. Both objecl cckbc;cl :5vjxu1-4;p p;l+z/r i mmts 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 certai wjod1e ,nfko f: *rl*o514k/a0vnmqp n distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under theo1,r:kve4qkoad5 n1j*f* w0n/p omfl 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 constantm-i 49 r3uwwym i-2 oyr:o-ejc mass orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the plam cu3w -ry:9oy jo-wm e-ii24rnet'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 pcvds)8,hiec1mk(q -bh 01uo1 5 kw yflrinciple.

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 sxl*k1xws .2 byystem to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objecbv. ws5i h3s+.j /uob0rkljzr)6 up p6t with four times the mass of the first if released from the same height. The pl 0pu j6u.)j+6 .i rbovz3/hs5swkrbpotential 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 attach 8fjcbv kl,r;e zx++9eed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of therj+x keefc8l,zv9+;b spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a 8;gg) z ufp9lzms.c)qp*f av (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 0mb/dlsl 39 xra tree. Compare its kinetic energy K, to its potential energy0lr x9m3sldb/ 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 hill.8b /.fco:puye m0iw 6mvao*0x

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) ( 1ybh+kr*plzlpit 8 sliding with equal speeds along a levelk byp1hpr+)tl(8i*zl frictionless 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 0buuxchw/ahd px)3/4$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for cog pg)3ha,2i (dhi0snonservative forcesoi 03h)d gg(p2hai,sn.

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 (air friction wjkv,sv k1s-w 390ewiis present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of t9s3e1 vkv-wsi w0kj,whe 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 kinetgfi oqq.6/ui ft*1v5i ic energy. Do not ignore air resistance. How much gravitational potential energy did the baif/oi6q. uv *itg f1q5ll 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 gravdl e;2,r5yp* pevq(pnitational potential energy. Do not ignore air resistance. How mucp rvd(q;*5p e2l,pey nh 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 conse pga:3:cv7ogo vk kid /rl:*m0rvation 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 isfshw+ a(zw2li t9 -emgl -2wu*

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 o/rtjyh 2wr 04kf power expressed in SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is drb glr59ab +)qh 8mz-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 yesterdalm /-:vy,z wzugk :fa0y, you did 3 times the work in one-third the time. To do so, your power out :mla:z 0wfgkzyu, v/-put 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 acceljhd.d,nnm- d 5eration, 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 helsfoawjn0( wdh71n*)otobj *: d there. If the object weighs 90 N, how much work was *t(wnn :odf*w0o1jb7 hao)js 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 dis+fcl 8g (4uu+ xutx4akwq83sm;3u tk ntance of 1.0 m, at a constant velocity of 0.50+;xu344nu8uxatm u l 3fwg(+8kqck ts m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 550rm4 mgn;d;pk5 0 N for a distance of 50.0;g;kd 4n mpmr5 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 of 5500 N fovf4(h/.e a uctr a distance of 50.0 m. What is the work done by the weight of the elevata(vef4/uh c .tor?

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 distanccwr; 1 8wow6ew6*0m-mnb wm bn6 xx)wve of 50.0 m. What is the net work done on bm;w0vx*ne 6w m8-6 w)w6wcmxw 1r bonthe 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 ul7vd7iw ,2rv 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 slides 8.qiwx -8 1xxd4c9j-awv09skag0 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 Sarahd;9yg15b mbwn8 v2 b.yw xxl4b in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anw9gbx1vb xy.dl 5b8;n y wb4m2gle 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. The graph in Figgv393chp rn6+9nunbfy b2sx mi /te() . 6-1 shows the force versus the object's position. Find the work done when the object moves from 3fn tyrnb+gp)ni29uv hb(c 63em/s 9x0 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 th qcsx5 0/g8j7wfh,l gye force. The graph in Fig. 6-1 shows the force versus the object's position. Find the wojl5 hgy ,fq07/cwgsx8rk 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. Tm6thk ;5dby 1ihe graph in Fig. 6-1 shows the for5myhk; 6dtib1ce versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6wbg- yrz .:l:jl+m ) *wlovk+s-1 shows the force vwl rljgoz y: :*s+l.-wm)bk+ versus the object's position. Find 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 N is applied to move a 55-kg cart (initia83kl(a dbe -p w**re( 3ixp1c a s1n;ando/hkllly at rest) across a 10 m level surface. Whxwn;ern (adpek(c3pl a*1l *d83i/-bk 1sah oat 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 ; 0xe/ lc xupmx7he4mu1i ;x2rmove a 55-kg cart (initially at rest) across a 10 m level surface. What x pi;;r71hlem xe4x0xc2u um/ is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is req1(u0 wonb+od.g6;k tr.wg hat uired to stog .uw 6+dbnh tk01ot(ga ;w.rop 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 caua)(ik,qhh.8 r a 6rvsr initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditio a6. h(8qarsu),ivrhk n?

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. Itfnuon9afz;2n fv 2; e; is cocked by exerting a force of 20 N over a distance of 5.0 cm. With wnf;2n9n;;2 au fozfevhat 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 component of 6vinge rd7l tv++.rk53 0 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the fegnvr.t57i l3+ d +vkrloor. 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 int 64/o gv9hgbnv .ma2rbo a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before9mvo .4bg6 bh2vr/ga n 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 moved from a height of 7.00 m above a floor to a height :8w5 7zwns )8mn8d2 bsyakgnp of 13.0 m above the floor. Wg)7da 288w mb8p5ksn ny:wzsnhat is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and ritgoc6ow0 -ymq2 f;z lci 8vd..xq .wh+ses 2.0 m. If the plane is frictiong 8w+w.otfyqc dh 0q o;im.x 2lv.c6-zless, 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*8h4kr p s,remg, causes the spring to stretch 2.0 cm. What is thr8,pr4 skeh*me spring constant?

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 sprr7s 9kdeyvx 9+lc354cm.my j9t q3qeling constant of 60 N/m. How much potential energy does it store, when stretc l4s qe99ykvry3 c3jq e.cmt9m75dxl+hed 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 uncompressed sprpq4)bo.y e6r ring with a spring constant of 25 N/m by 10 .r p4 )reby6oqcm.

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 strec)k (cqq ed (r.0yzv6ptch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position iqzq6 (e crkdy)0p.cv( s 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 compressed by 3.0 cm. H gqqf r:b8l3v :jsx0a(ow much work is required rl8j03 vq:sfagb (q: xto 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 tjwi 30bwh i8ak 4yvp -b1tj)s;he top of a 50-m high slope. What is the speed of the skier on reaching the bottom owi304 a)8pv; i w -sbthyjb1jkf the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed7:.g 3wx)kxkg- vlgdy of 4.0 m/s.y-kkvl7g d3g) :xx.wg 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 -fr 7sdq1t, phplane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the planhsrq d7- 1ft,pe?

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 v0,vlj/cd,zvfloor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast isjv0, vlv d/cz, 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, bla0bz2qs3 elnn bn)jo ku*4pl(8sts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its tk)l nnun jq4bsp0b ez283o(l*otal mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinet1 gb3ddvb7u:kbm-k, o ic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point,ko b3dgm-bvbu k:7,1d 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 qd:p;h.(wiyyexjs 94c jye ,4the 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 abov4wjceq4d:xyysye( ;9,jh. ip e 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 an1hwq :iw 0jr7spe m+v 8s,q)bbove 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 b snb:)ir ev wh0,8sj mq+7p1wqottom 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 pmq2k r6kf .o)) sqez1boint 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 roller coaster at the top of the next slope, which is 45 m above the bottom of the di)qkfs1qeb mr6z2).kop?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (pc ovyt)om-(i6 tw (2vpoint

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.30 m away f i*u*rovs(: nfrom the vertical axis and released from rest. Wvi :*(rso* funhat will be its speed at the bottom of its swing?

A. 0.42 m/s

B. 1.12 m/s

C. 1.68 m/s

D. 1.40 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 initially uncompressed horizonta(n6 mbjfg4 k+ql spring with spring conskg( +qj6fm4bntant 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/t cu 8wc vp4b7 mmmi7fr82d2/ms, slows down her 2000 kg car to stop for a red light. What work is done by the friction fodv7m i/f p7cbumwr82c8m2m t 4rce 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 6vc .t-fek*-e z0.0-kg object and a horizontal surface is 50.0 N. Iztfk* e-- cv.ef 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, level surface. It has 24 J of kine dyx7 1zjsxum3+ii- f-j+tfr -tic energy. The friction force on jy -+u + szftm73rfxx-ij-id1it 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 a lsri z v -n396uomr(im.evel 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 change in its kinetic .iirsz n m(63ov9u-m renergy?

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 fra/ jhlkg,rgqne-.fo,o 7 hp*/ om the top of a 50-m high slope. If the work done by frictionj/ kgohr,ep/h,ogla *fq .-7n is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up ahvc 5i8pspa 14n inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitu4v 18p5hscpa ide 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 4g q; m5ontf2ofrom rest at the top of a plane inclined at 20e above hoo2n45g tm qf;orizontal. 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 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, b8k( -q3. dds 2tb)t9i egsumq1fd,cdand strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it fa8sdutf(i29bkqddd3 m.gbcq1s )e ,t-lls?

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 energy when he runs up a flight of st 3xxa+3a ml/wlairs 10.0-m high,m+a3xlwa / 3lx 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 (aclay5 h11 vkobject with a constant velocity of 5.0 m/s. What kh 11lacv (5aypower must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for be5auj+3uyew+r x go38te- (tpm9y( v1.0 hr? (1 hp = 746 W t w-+3(9ypouae evj 8gemy3u5x+rb(t)

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 much fo+m espep; );rhwrpk59rce does her foot push with when she is travpms;)we e9r+;pprh5keling 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. What7r:wwbf4h yg,j+ ;onz is the average power delivered b,+hj 4;yw7wnf :gro zby the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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