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

1#

What is the correct unit ofjb;,p yn qn(so*s5nb. work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if therpyl3)ah-j9mix6q1 *q i0e jql e 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 amount of bp10g2fxar)ckgs -h8ie -j;v 4hkl-s work you d fh pkkvs821ehi b c--s4;r)0ax-gjlgo

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 verticallgoip hq)vrqdpztu9, 02 sm4j (r;0g g.d 8i2ray and is being held there. How much work is being done in holding tha 0dq pj u)gmsv 2hi0rir2p,tzg q48dr.9;(oge 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 for2l0wbs d 63apbward at a constant velocity carrying a 10-N object, the amousbabp 3d20w6l nt 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;w 8ojeva 2m*n lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N ovwanm;2*e j8, 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 ob+d/0y vhs,) 1 fimzhnmein7 e:ject 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 straight up. Compare the sign of tz mo3j:r0hd/ jhe work done by gravity while the ball goes up with the sign of tmz3jr0o:hj d/he 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 Forcen9;p 9kn dh4qw versus position (F vs. x) graph, representswq;knhd4np 9 9

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), wbhq pi4) rg,n2hat represents the work done by the fo2,r g n)qhip4brce 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 object1 ppx1kne 0-mw 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 c yrsc ,t0b,ph;sl9s8k n ss-6object'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 objec)0o) tojge6hkbpn/t/t is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed of they)b,tlmi sa 8: car. Which statement is true about the truck) ym:, a8stibl'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 car J has half the mass of car 2p6j+m,pli h(o9 vmfr K. The kinetic energy of car J, compared to,v6ilofjp mhp2+rm (9 car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its o3ehn 7ku13x wrdvp3d f0ki,t6riginal speed. What is the ratio of the final kinetic energy to the initia wdfk, pvd73e6k3n rh1iu0xt3l 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 mt5ffe(s.x v 4i/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic enev4(i stef.x5frgy, 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 spgy+z).di euo y(+hutar5 9:nbeed 4.0 m/s. Both objects encounter the same constant braking foru5 +9uh)g+oy. bzn: t deay(rice, 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 brakesp t): idq+1wpm 7hvu.d of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance pipd).7qwh: 1+d umtvwould the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit. )o pc7 -)eislin3q ;nt Neglecting any friction effects, what happens );-piq 7 i)lnsenoc3 tto 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 principl czjm67r v2jdgm9, 8ose.

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 ta, d1y84czgcmuw. +qm rh; adl,;+trmo 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 abp-(aw w ,bppo4t 6zr8hove the ground. A second object with four times the mass of th (8p,rw6 ta4 hobzwpp-e first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a springrtwbbbj o6i sb 5p02r o r+u4n7o93n-k causes it to stretch 5.0 cm. If another 0.200-kg mass is 6pu 5bt-nrir2rb soj 370wbo49 bnok+ 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 energyfv;t evzw6i:e cz*o yg6f01,g 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. Compare its kine/dwc0 t)v9atdtic energy K, to its potential energva0)/ tdcwt9 dy 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 o7;f qj bip8iks;av*qvm/n(+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 u9mn.a1 aqam +and a very heavy object are sliding with equal speeds along a level frictionless surface. Themqa 9nu1a.m+ ay 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 2wwsp t50 e4fwrd5fg0r8j3 rg$m_{1}$ 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 conehsfvt )2ekjrypb)9k22(j7 fservation of mechanical energy for conservative forces. pkf2)9ke fev722 bhr( )tjsyj

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 uz(zuqj7ahg *c ycd257 h*k b2a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to t25 yj* kzcdg( uzhqa *hu7bc72he 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 +ac bp6z lv/+uih;wf6energy. Do not ignore air resistance. How much gravitational potential ene6+/6c bwz ;pv+ufi lahrgy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational pote 5oq4y-nvtu/ential energy. Do q5-eu v4o/t ynnot ignore air resistance. How much 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 consef691cpp :haxmuv -.:h7s hmcervation 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 iszczulxii15 24r *t p1j

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 uls/xwx h;:ki5 ftk35;r6w 7vovqvw 4gnit of 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 i3 writcjm+;ei.kbz 2(0i ;kdys 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 4 cvikpwt9p7z,g4 3vn the work in one-third the time. To do so, your power output must ,vkip74n 9g3vz 4ptcwhave 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 engcc+* vb lw gktu7f aj,.(2k5rgine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weighs 90r1y1 aww d+*1jasvu9m N, how much work was done in liw*1 a9u ad+y1wrjs1vmfting 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-m 1qk8:p9busgsqsd 3 0e2wd4+un ms k up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done bybmp :9d-gn s+msew0s3 q12 k4dukuq8s 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 pulle etvtev yv3+0(-twj9 o6kjcj-d upward with a constant force of 5500 N for a distance -3ettc w(-vj96ovkvyj+e tj0of 50.0 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 for a k 0igqug- m*5gvn m;1t5c kg1odistance of 50.0 m. What is the work done by the weight of the eg t1;5g0onmm i- qgkcu*gk5 v1levator?

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 df9jwd mm+pb a685rr8 0)nfe wupward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevaepr wff6a)8+d rw d9jmmb5 80ntor?

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 al2d9psebbieo-7nd9 i bu45d p2 ong a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramcw-;j k fl,,ilrq+dz8dm2*ikp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume ;rappy+b 59 6dd m ew nzdyov,t:5/)syno friction), with a fopbzd;/ty) 5nd5d: v,y+e os6 r ma9pywrce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of themgh9k jfv1o+1e+)5 w0rlmw i d force. The graph in Fig. 6-1 shows the force versus tfrgjm+5wo) 0 e 9+wklmv1hid1he object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grad eoc- 68qxde v 5ve2v(tt**mexpwd;5ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 m55qx62vvptx*-dewe;ve ed o8(* ctd 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 Fig. 6d8k+2gr yq1i am,wyo;lk b4f,-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 f2; bm8ol1k ya4ryig ,dq+k,wm.

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 forceoy-4ugk5m zr *atl:zqs)- g f0. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.ouam z*f4q -tk ) 5l0-:grysgz

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 (initially at9x4dgtuayl 41 y 5-bjk9ic7 ov rest) across a 10 m level surface. What is the final kix4l1gj9kb av y5d 7u4t9yi-o cnetic 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 e r8d2foyo :3fto move a 55-kg cart (initially at rest) across a 10 m level surface. What is 3fyfodo8e 2r: 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 workx o)vqm1g n x hp7t(+qng,cq:( is required to stop the mass?h7: q)ngg((qvnx1mx copt+ q,

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is ry8ja(e sp-+b uequired to stop a car moving at 5p-e(sa 8u yb+j0 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 2q ed / a-0a32vwnf1cokav pe-*ye2tqgun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negl3n2/ dv2-*qfa -c1peevyw2 0 e tkqaoaigible 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 componer+6f uy-jsp7 ont 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. Whsp7o-ruf 6 +jyat 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 3y m/f+sj n3+vvld2 2vu1qlxzshot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm3 v2sd +vxv uz+fl/qjm12lyn3 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 t4 sns3p4ml(1s39 h tkk qwwu7qo a height of 13.0 m above the floor. What is tqk9 s4pks(13wwnl4h7ms u3qt he 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 pl gn(0 *v82 t0 -zbg.p6mv ezencayi;utane is 4.0 m long and rises 2.0 m. If the planevcby.0gn0me 2(8z ita6;*v z-ntpeug is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to strx+nlp pk);g)1v a7gp8ll d :wtetch 2.0 cm. What is the spring constant 1:)g nl+p7tx;kwp8v lgld)a p?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How much p f14( g:qoufp /bf3du y7o)lqvotential energy does it store, when stretched byofboyu :d)f 74 /3(qpl1gvufq 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 fbu heu4by.25an initially uncompressed spring with a spring constant of 25 N/m byhbeb yu425uf. 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 constantc yrha7keyj b6tr*:9, 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at: cbh*j6 yta,7k9yerr 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 compressedh g*k spr0nlhqoe4uq;r6 o:+ : by 3.0 cm. How much work is ; ksq4 g eoh*:lpq0r+uh nr:o6required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What ishmc he)79r 0 c:o;y;ge wriaj7 the speed of the skier on reaching the bottom of the slope? (neglect frictionj)ma;grhrwe y097:eho c; i7 c)

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 t 83alc 50-arkaup 5o6zsx qy818lb-. wkqqe nshe top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after n5o qqyc 6e5 ksr a qslw18pu803baxa--.l8kzdropping 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 frictif a.r rwx b*dh bqd 8et*p9c*,/hwqp90onless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height ofq*pt9980q*rwf*ba hx c .,hebdw d /pr 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. Whttc 7as asg2/0 uy.+mqen it is 0.70 m above the floor, its potential energy exactly equals itssm/.t2 sa c7aqg+yut0 kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straigh; zoyz 5-nja-jt up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total m -a- ;zjn5yozjechanical 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 kinetic energy ji-rp6hh*xy; of 220 J. At the highest point in its trajectory, its kinetic ene6 *x -h;ryjpihrgy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m-(,3izpfa +zykr*d 4budw mt - 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 bo4if ,-(-a3rkdy ztpb *+wm udzttom 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 .toh(m h* nt,k0jumx9the bottom of a dip (See Fig. 6-2). Neglect friction, what*m0( jnkm.h9xt o u,ht 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?

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 bottov,.gs.x iqj*bw ql4q8m 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, wh*,q. lixqwvbj4q 8.sgich 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 bott g3gfvqeq5o6o6 6s,b.fg5x adom 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 0.20 m away from the ve r) :a2qknu3yjrtical axis and rele)rq32yk jaun:ased from rest. What will be its speed at the bottom of its swing?

A. 0.2714 m/s

B. 0.724 m/s

C. 1.085 m/s

D. 0.905 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 a rbi00 n1+ur(z zna/kxy ,6ufnn initially uncompressed horizontal spring with springbknn1 f 0y +arru0/xu,zz(6in constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red ligh+s,rgnzm,6gv v3f 4znt. What work is nf gg4n ,zm6vs v+r3,zdone 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-kqq(d m1+ mywc)owk6t. g object and a horizontal surface is 50.0 N. If the initial speed of the object ioct + yq.6()w1wqdmkm s 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,)v 4cf qe)l:a 5(8mgz)zwrdpa level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N.zdvaa c4)8lm)( 5q:ep f wgr)z 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 surf/wwzu* iw1x r5s ey88race. The coewxw 1iyz5*es 8 wru8r/fficient 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 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 froml 2 oxq:6.l9y hsxk3ss rest from the top of a 50-m high slope. If the work done by fryk9slh6o. ql:xs2 s 3xiction 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 planen2d51w l qxl1g 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 p2l qg5lwdn11xlane. 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 re ) wb5qqp(ui4est at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic frictionqqb5wu()ie p 4 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 pl tz- 3(d)k lc3+ja-0vpls nsfrom a height of 10.0 m, and strikes the ground with a veksdpp0zst j -(l 3c)v nl-al3+locity of 7.00 m/s. 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 boy using energy when he runse c.stjn) o/zw1hec22 up a flight of stairs 10.0-m he e/ hn)1sw. cjozt22cigh, 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 q.4obwfd onn76sk d06constant velocity of 5.0 m/s. What power must be delivered to04n dqk.7bw6 ds of6on 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 1.0y jnnrs1me(,z)x agp*/*,ik r/ ib 4ht hr? (1 hp ,zt sa 4er)i1*prnjkng,*iyxb/m (/h = 746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How fq mpixd .bw9j(m,j)2much force does her fm, jwdxji mf.2)q (9bpoot push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates froi8s f b6attd5+(l+x nem 0 to 25 m/s in 7.0 s. What is the average power d5+it +bn8eds(xf6lat elivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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