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

1#

What is the correct unit of work expressed ircq*dj7 +m(7ib8w c syn 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 t,zppf i x/;6dw+2sqjdhere 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 brick wall, the amounhyv6kttm.. kex.- jgyf504 nnt of work you do. 6v yg-tk0mnn.4 etfjhyk5x.

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 being held th, bn71d v u5/ rg)d2rrnkpgam*ere. How much work is being dona n1 5gk2)rb*md ,r pvdn/rgu7e in 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 consd1s bm+zj 2(*5wf)v2d+va4h v igneuttant velocity carrying a 10-N object, the amount of workf+ mvn s jiga*v)eu(5+zt2 b4hw12vd d 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 to its originallfg.ai*l+p..fli 8 z w position. If the total weight is 30 N, how much work was doneip lf8ll+wa gz.*.i .f?

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 actinge2p76zto kz7o on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball str4(. ,b4u g+/dovbco;hb oh gfvv2wtj2aight up. Compare the sign of the work done by gravity while the ball goes up with the sigohb.bo/wohc ,dg(jv b ftvu42g;v 42+n of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) gra6bqw6*hkc f lt89qi( qph, representsht*i q( c6kq86l9bw qf

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 the work za4a0up5- 8lnt+ rbhrl i4id;done by the fo58hrnb z a ;llrda+4ui t0p-i4rce 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 ogyfz.s-.;z,qa g yg tul ;,zs9bject is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's /snrfk3-v ni 7kinetic 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, +pvz1-ikdjz:6wvn c2 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 th2 xx5f w*lfjy:i/ 2aqde speed of the car. Which statement is true about the truck's kinetic energy compared t x /a2y 2dxf:j5*fqlwio 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 car J has half the mass of car K. dc. )/ogj1lwg The kinetic energy of car J,/ gwg).jdco1l 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 halc3-8 ugdmdz+6;f taryf of its original speed. What is the ratio at3;gfzd 68 dmuc+ -ryof 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 z s(vr5e/p lq+5 m/s. If both objects have the same kinetic ez5lps+ q( /revnergy, 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 withxxyf;u/)yj)ti2j;r h speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which o; j2 tfyh)r)xxyj;ui/ bject 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 sl:w9 (m9gxuk9 u*rl,fsqx)ipanic, and skid a certain distance on a straight, level road. If you had been traveling twice as fasuum qsxr:k)f l99gl9 x*,i(s wt, 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 m tfl9dcvo9eayv (b0ef 9hy4 -(ass orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happeyc-l0yd bfa (h4(efv9t 9v9eons 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-energyt8q 0qdcc r j)c8a0kgk0be4vgt4d u +: principle.

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 potent+;s nt, cy/pyfe rfh68ial 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 (w0 z-*ce yt )a8oy;rq1e-0m xipjl pxheight h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compareem- xxopy;)le 0wrai(*y81t0p jq- czd 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 aa,sc zr3c fkeizi-24/ spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sir2cfi4es /,cz a-3 kzpring 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 systkzr q7 0lo-8e,0yb;y ;n6hq zegl9cya myr3 t5em

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to i6o xow2mwsoe5gbcc+n .*2 l 3jts potential energy Ubcojc+og 2oxw6w5em. ls2 3*n.

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 c.p t(cn7do + frw3xr/u*+jnmm ar driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and bdh fm+6 0+qbg ye1*f6jba djb3ww+8c a very heavy object are sliding with equal speeds along a level frictionless surface. f68*w j61d wje+b0y+b 3g+hcamf bdbqThey 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 fxso05ahte )1+d b3 mw$m_{1}$ 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 feet*39 w )k upk/q:pgof mechanical energy for conservative forces:wgf9/3 k ek)tpqu* pe.

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, tph e 0.su3ga(nkhojj 8jk+-*fhrough the air (air friction is present), to the ground below. How does the kinoahj he0jk*gukn j.- +p83fs(etic 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 2e9 m yxxet7n9h 9nwl+not ignore air resistance. How much gravitational potential energh 2 tn+w9enx9m9y e7lxy 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 lose 8dqlh/5zejr kg+ :g,c56qgjes 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy5kg c8:q+,ede/j6hq rg zl5gj 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 conservationfs + vz8le90m6jh9ls z 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 isg3*km yhe (crc07pn 1o

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 expresseon)g3;cvsm+ m +x vc:wd in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of power?vqoga(jb jc/ 8*av5h-t*s ;bpuh)-r g

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 timesy yd9alx+;cin10 1ox o+krlv1 the work in one-third the time. To do so, dyxrl1yioac01nkx9l+ o1;v + your power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car' 16nh;odq+17v t ge0vumewy(j 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 5w8umvqg4f:j; *vhop the object weighs 90 N, how much work was done in liftijv4wfp* og;v hum: 5q8ng 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:w7 y1-jy:s;h3lbp/ryh b mism prl3., at a constant velocity of 0.50 m/s. What is l/31mhry l ps msb-j:yrw7b;:hp.iy3 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 co :uhbvf6,bpmk(w)co; zi9 /pwnstant force of 5500 N for a distance of 50.0 m. What is the work done by the 5;b vumwbo zw /f(icpp)h,:96k 500 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 for a distanl frx./kt4+1bsr3 ,.x psq cnjce of 50.0 m. What is the work done by the weight of ther+3qtr sk nx. j1,f/bxc.s4pl 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 knlwn*3n) l b7force of 5500 N for a distance of 50b 3n)nk*wln l7.0 m. What is the net work done 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 up along x4 cg+;(pf4zj79bbu g c6 cznpa $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m g tbcawo)dvm: c* 2*n0down 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 littm +k.+ab ki+r ;ls)qamle sister Sarah in a sled on an icy surface (assume no friction), with a force of 6+kiams;b) +.q +lmkra0.0 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. The graph in Fig. 6-/ia ak9na/cg1 1 shows the force versus the object's position. Find the work done when the object moves from 0 to 1i/k ag/9acan2.0 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 (eoyo* 0zcr3ein the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objeco0oze(yc*r 3et 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 the0hw p0a8+xroasn a;y/tfny7- k ldh .h1k3r( n direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objecy3lf;py-0 sxwna k+7n hr 0/n 1ka.d 8(hrhotat 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 directrs9 me1h bl 9v.)qgc*vion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from9gl mh)9.s eqv1rc*bv 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 applie ;cnuq(qbe23/ /x gnald to move a 55-kg cart (initially at rest) acrlngcu3a e bq/n2q/( x;oss a 10 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 at reh9j-v; t4hzns0 gby 0nst) across-nszyg n40ht0b 9j;vh a 10 m level surface. 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 movi eke.4-fvxte4 ng with a speed of 5.0 m/s. How much work is required to stop the mass?4vte exf 4e-k.

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,rqwhy b7 1)9op what distance is required to stop a car moving at 50 m/s under19 py7 wobrqh) 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-wu7 upu(t *keey-u: ,a. hhsk;g dart. It is cocked by exerting a force of 20 Nytu- hwp(h* ,aekek: u. su;u7 over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal compoepkveb3)k( 45na;ov dnent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's finvped;e(nk4) vkb3a 5o al 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 horizontally9a(1ocwuq /5/ojq ap v into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrateqqvj19 p uoow5a(c/a /s a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor ti4e0a,.f ca;dtr y7hfr1os0 wo a height of 13.0 m above the floor. What is the change in gra,da7h;.t efr1r 0 oy4fsa cw0ivitational 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 loez,c7 d 6m zm:dsm77sd) xqear*0c/r yng and rises 2.0 m. If the plane is frictionless, how much work was done*mr zs 0rd ,d7qey/m:d secc6a7x7)mz by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes th5 wqw/rd* ug5re spring to stretch 2.0 cm. What is the spring conu*5w rg5rd q/wstant?

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 characterdq on p*v+ev4c7.gk9mized by a spring constant of 60 N/m. How much potential energy does it stovq.4g vm*dc+ e7 npk9ore, 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 t 14zacv -u68aawp zr(no compress an initially uncompressed spring with a spring constantw1aar 4(nz8u6a-z vcp of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m from x = 0.goj;l 2ebh +v 4(ct:6z0s*fbop qxw0g 20 m to 0.25 m? (Assume the unstretchgelq j204o;v 6s: bbp(ogtf+* wzx0 ched 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 compressed by 3/ tyu bn9xcuq u ge4 (gpj1jd/btb9/7*.0 cm. How much work is 9ub/ (dcn1*j/g 9 jpguqt/ bxe4yt ub7required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top o twxrqg- 01 ty 9zdge5,kp34uzqu40kbf a 50-m high slope. What is the speed of the skier on reaching the botto ,ggd10 k3k5tq9wrpy b zq4xu4t -zue0m of 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 wvz/,j+ cwp2np ith an initial speed of 4.0 m/s. Neglecting friction, how+nzcpjp2/ ,w v 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/6o.m*p qg whd8n4esy a frictionless inclined plane. At the bottom, it has a speed of 9.80o syehmn6/w.dp 8 4qg* m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its potenk* hjw;mw1 lq eh:k-w//oifr7tial energy exactly equals its kin fm:qre/hh w-/ io7;w*w1 lkjketic 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 bixe6w*l 3b zyl5p htlm90 -1urrtj 9-kw.dd*level with a kinetic energy of 40 J. At the exact top of its trajectory, its tpjb-k- d.6w5erx9tl1b *lmut0lzy9* hid w 3r 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 wiyl7(wnzj qy6 zws1bpk/m 2-9ith 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 lau-nw zm 1ykbw 2j/piz6s(l79q ynch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a di)1 rk tmwfn14dp (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 bm4d)1 f1 trnkwottom 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 the br;va lx xz(ce*v)k+) h* ,torpottom of a dip (See Fig. 6-2). Neglect friction, what will a* ;vv hpe)+xlrtcr(), oxzk* be 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. 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 wpyhf4m:-(8uehd fk mv m053mcntw23a 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 roller coaster at the top of the next slope, wh4 uh tpck0enf3 wm2mh(md8v: mfw5- y3ich is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom qhgvo/da8 o) i-nrnd 9qz.n,. 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 2-kg pendulum of length 50 cm is pulled 0.13 m away from the vertc,(g/2 g jjwluew d7u:ical axis and released from rest. What wj2/uc7w, egduwl(g: jill be its speed at the bottom of its swing?

A. 0.1742 m/s

B. 0.464 m/s

C. 0.697 m/s

D. 0.581 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 initia. f),fegk 9f hr*unhe:lly uncompressed horizontal spring wie : e9.)ugf,fnfhrh k*th 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/,p.o8c tr7mbv+*q zw apyv-x7s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the who7w cq.va b8zpmy,x+r - pt*v7eels?

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 frictiondb c)4tk ssv5+0 wc+um force between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial spewb405 c+kd cvm)tssu +ed 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 kinetic 1xszy1b(( gzcxgf8 a: energy. The friction force on it is b1a8xg( xz1:s(yfg zc 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 level surlnj;ny3s/2:3 exf-f q ;)n oqimv a7xkface. The coefficient of kinetic friction iqx/smx)qln yn; :7 j v;-o2f3fak3en 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 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 a 50-m high slope. If the w u jywy5 6lwekqjo0(gcs1 ,hii9.1( rpork done by friction6eicq,usry hj 9(.jyol01gw(1pwki5 is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and rise;d)t tnvwz4( wrsus (3s 2.0 m. It requsw3u(;t( 4wtdv)n srzires 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 dzi,v, ,l44 zbc) xnnmat 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 pn4zxcm,zd lb4)i nv,,lane?

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 v;.ij wrvt9p *a velocity of 7.00 m/s. What average force of pi*tj9v rvw .;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 energy when: (5g5ytf gutm he runs up a flight of stairs 10.tf yg(5m5tg:u 0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocijfz+ ;wz(q9,krl.iij p+, / xwp7zb sf;b whp8ty of 5.0 m/s. What power must be delivered to the object by il+,iz+,rk/q8 hww s9z jb(.fwb z;pfp;x p7 jthe 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 qhg l p50t0sl0runs for 1.0 hr? (1 hp = 746 Wthql p 0g0sl05)

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 cot4tda) y-+e at the rate of 500 W while riding. How much force does her foot push with when she is traveling aayt-+c to 4)edt 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 d2oda 5gff(4rm/s in 7.0 s. What is the average power delivereddf25r(d oa gf4 by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95