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

1#

What is the correct unit of work expressed *ch7wd7a-dm u 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 nua /3us(2mwjp c7g, qho 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 worfouv3s8foa 4 gs)w9+o k youoofsgauv+s4 f8o 9w3) do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m ver) ezc7xqly;3: u2rulz tically and is being held there. How much work is being done in holding the box in c2yuq ez3:rz l l7;)uxthis 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 horiojh, /nnzdd 1(ppe m01.o *xwzzontally forward at a constant velocity carrying a 10-N object, the amount of work you do i pmzonexd jp*1.(d,/1w h z0nos

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 3q-y dop4:8v bi.0 m then returned to its original position. If the total weight:d v-8oipq4b y is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an obj0ko*dzgurlf c113v aqya(r - p ia)a v,e+89coect 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 the work done by gravi wb-bl4 sno(y1ty while the ball goes up with the sigwyl4s- 1 bb(onn 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 p d1:j+ +pwvxdposition (F vs. x) graph, represents :+1jwddv+x pp

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 t*hx1/0da)uo zzdh nu5he work done by tz hzhua) *d5o/u nxd10he force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; mv^2$ is

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object(kpxp)e8 :pw s /8ngf1gqo0ivas6g(l'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 obje akz/x;mxpv)6yo 7u m*ct is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object' 1kt8 bviu0(j8cviurbx7hkzw /72h o0s 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 ca8unyf ixv (n l14.awr1v7q dui6d5x 6tr, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy comparedx1w5ti yn4f6d (7v68ad. qnr luvixu1 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, a7qdmgcyu -+uy nhu/,6nd car J has half the mass of car K. The kinetic energy of car J, compar+/ hn7cdu,y6qy -u mgued 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 bnxe4 :v/0jqo,(n 9xqod y-p wfounces back with half of its original speed. What is the ratio of the final kinetic energy t( :nxo-x/fv0yew no4 qq,pjd9 o 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 9go+6k;rwhz.z r2(tl2u o tlq 3 m/s and a pebble is moving at a speed of 5 m/s. If both objectsrr+ 92z.oq(wl;ztg6 lok h2u t have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 mwau0vx:o7 c r./s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking u:c 07xroa.w vforce, 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, bwzmm q-fwnkuk(q r+.33u-d3 and skid a certain distance on a straight, 3u-b+mwrdkn 3qw(uzfk3 -m. qlevel road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit. N45c:zhl u upuz3 oygi:x (;xi/n q5ahg3b.u2eeglecting any friction effects, what happens to the planet's kinetiy;b. zpu co4giz:255ql (3i/uuha g nhe3 uxx:c 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 prinz6o +n: j0mu e/buuuv)ciple.

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 sypp5i+ dal9pi(stem 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 tgyhr(vnu xq6tksd8 ( z35c9s+he ground. A second object with four times the mass of the first if released from the same height. The pote ng+569zhuyk c vrs8dqt(x(s3ntial 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 torn 5p1f3:9 o y)racswm 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 the spri)pfo nc5:93 wsy1mra rng 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 ene1 h 3-h*ij vob8xruxu2g;s k)qrgy 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 kinetic energy K, to its potentlrf 5fdy33wr (ial energyrr5 3(fly fwd3 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 cax)9la ec haz2rb4h-u.2sfpj:r 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 a vc ;,5 *eulthftery heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whicc; tule,5f*ht h 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 s9iu 7+a1ogb +efda ;l$m_{1}$ 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 conservative fohkm0 ylyjc7s)-q b2wwkg8.g 6rces.0.s8g h2w l q)m w6gyykkjb-7c

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 build nr2on1id9g f*ing, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potenti1g2ni rdnfo9*al 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. hu0 r86xnae0,g uflu 5:ao :yrDo not ignore air resistance. How much gravit a5 :6r 8fu o:0ulynarg,0ehuxational potential energy 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 potential energyhrnhp;ll j3*maz-*tr5q m j+, vm+ bs3. Do not ignore air resistance. How much kinetic energy did the bala3* +z5m,nj 3 mm hsrbj*v+ qhtlp;r-ll gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation o/lv pbx8d rig8v4j -irjb jqv. ::31ryf 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 iso/svukf6ph fw605 )l.ou - nbw

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 ofe 8l2ty+b 2slh 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 tqy pw-fo 87yn19+rigis not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time. To do so,v9-bdnfpr7+ dbl7pefr( t +r3 your power outpdvr+f+7 3-dpl7et nbfp(r b9r ut 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 acceleratiorak 1ps (hen40n, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held 7; ilpyxwxc3 +wa+ (tuwkq,u0 7f dm(zthere. If the object weighs 90 N, how much work was done in lifting itxpw0wixc+z;+t(m 7 7dyq(f, ulua3kw ?

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 t3lie/;n4 1eclt z vw:che air a distance of 1.0 m, at a constant velocity of 0.50 m/s. Whatwt4/;:vc31 lie czel n 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 hf2bhu)wxsp;q) -pom/ikndjs)k ( jn:3l/q, 5500 N for a distance of 50.0 m. What is the /nws m ,h) /ik-xn)opd(:3f2bqphj;u)jlqskwork 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 wisaxm3d ub;zpae +/ 7b7th a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevatoaz77ux;b/+a d3bmsp e r?

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 pulleb.zqg m+v503eyn,lxq d upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done ol.n 0 e 3yb+,qqzvgx5mn 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 a9+h*a zd )qlisk(5* c9lqqqfk $37^{\circ}$ 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 ramp, inclihyu ;hph(txvnjd-ey4.n 7xxb7 . (i- rned 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 sle12yf f :;0q ijr44s8d6mdsdldal8smcd on an icy surface (assume no friction), with a force of 60.0 N at an angle of y8a04jqdcfs8fl mim46d s l:sd d1 ;2r$37^{\circ}$ 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 s g+:lz65 mg7xz/yw iiin Fig. 6-1 shows the force versus the object' +s m:y/giwx7ilz g56zs 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 objectq gf .m626qy99gp a7xe1x lbqn in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.n f yma6pqq92q6bxg x7.g1e 9l0 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. 6;w58.d t kcbjh.8 zqqx-1 shows the force versus the object's position. Find the workq85bxz jtqk d h.c.;8w 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 diravy.)n ot/(ao5 oiev7ection 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 fit57n)o.(av/ voyaoe rom 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 (initially i 2xodk dl4/x 4d:2q ,pq,2yptaeyjf:at rest) across a 10 m level surface. What is the finalpd l4kq,,/px idox2 dat4yy q:2j:2ef 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 20i.h ;.dx wwxgen t2;*m0 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed o xwe;;h*2x iwgd mnt..f 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 mu18;:jtadz v8umnezz):9nqa rch work is required to stop the massz8n9m zna1:eaq ud:v;) t8zrj?

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 9sa*9,h y:.ltwhv zksis required to stop a car moving at 50 m/s under thekz9*hstylhv ,:9sa. w 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 17x 3 e;.pdnxuvksei 6t5es5 6s0-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 v e6n;usie3p5e ks. st5x7xd6 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 80juob6b0*iyxno(95 (a vq tjd + N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionlesay9t nx*u(50+bbjooq (6vjids floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontallykig/bar r/6uo,ezq ,0 into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the argre,60 /au, qoki/z rbrow?

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 abovejl)8eots w3tvi8has26-x v0z a floor to a height of 13.0 m above atlvs8-ez2i8w6j0tvh x)o s 3the floor. What 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 and3.g 6q3y iwo/ou+qufg rises 2.0 m. If the plane is frictionless, how much woruu.iq+qw63fy/ 3go ogk 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, c*go9a.ci-1 qkt6xrvyuio84 z auses the spring to stretch 2.0 cm. What is the sp9 6yiav.o4c1irko8g* t xu-zqring 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 characterizec:7cdew 6*by0hw+wm hd by a spring constant of 60 N/m. How much potential energd +wh*wyb ccm06we7h: y does it store, when stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to comp0tk * azpyqf.hsv,yj/z)*yd :m3:cxhress an initially uncompressed spring with a spring constant of 25 N/mhdx):kypm y,3z 0:c. yfv*a/hztsj *q 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/ v) 4,djay*mtam from x = 0.20 m to 0.25 m? (Assume the unstretched positionda4jm,) *t yva 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 compressed2l;lnr26v d m2ggmma6 by 3.0 cm. How much work is required to compress the spring an vm2llmn6ga ;22r6g dm 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(3)i1o/; e: h ztib/.rpoqhrr qx o0ikx)azk 7 from rest from the top of a 50-m high slope. What is the speed of the slx. qbk ot;()k/r03/17:a pehrirxoqiz ozhi )ier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial skh+q 0+iay+z4e849euhuqwv a peed of 4.0 m/s.ih4v 9qwea0 8+ zkhua+eyq4+u 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 b9 obs ea8q *fiwr2;/lhl9e8na frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the v 8ll829b f/ rqn bewsa;h*9oeiertical 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 tho9g z5yaw9+iee floor. When it is 0.70 m above the floor, its potential energy exactl5oe9yw+iaz9 gy equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up frf +th- phzrs,9qhw)s+om ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?srtwhqsf ++9)hh, -zp

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 wit7;cwb pf-*qfk0ph ji5h 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 launch point, did it 0 hqbpp -i7j cwf*k;5frise?

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 bottu)gzc 0.s4whc om 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 bou)czh 0sg.w4cttom 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 3cqt mjcsb46)bu 5e zq)c,z*v45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wil6 vct zbcjs),3q4uqe5 b*zcm)l 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 obh id ff 7g/.cf8i20sabove 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 tc2g hif f07fibsdo ./8he 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 fy kc1ax qbu/ yinz(-d*mm 3/*speed of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from t/.uuc-l y6icsnva3 wvt71.gwhe vertical axis and released from rest. Wh-ws6l1n vi c u tw/vuay7.c.3gat will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initiak+he on s1c5n1lly uncompressed horizontal spring with spring cnk1o ce5+1ns honstant 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 20sf vznib3+ pzqv-h4*,3 hle- n00 kg car to stop for a red light. What work is done by3sphznzf -bl e -+3i4*hv,v nq 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 60/39obi) :e+o if,jtmtia v ze2.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s,2) ttf,bv+z :e meaj/oi io93i 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 sur,vo q; g/i3 *5u*-zv8g,ylnir n gmltzface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it sli vt/rlgv-n*,y zoli,3qu m5igzg* 8;nde?

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 toe:t,y. c,eph vu;-h/ uffb9k ybxy2g.gs vl9/ a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetibsh.-y,b :y.gyp t,lh/cguf/ek x99ufv;2v ec 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 t74in;7f; yraee b(hiogp bap)9 95jtdhe top of a 50-m high slope. If the work do9e 79fnphpy i4e;) ;a7j5g ibrod(tabne by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long an hjsl;ph a()b,d rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average fric l;bh)saph j,(tion force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 2dh 8g.itj7n;y0e 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 slidingn.;t ijhyd7g8 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 oc y;4( akaxbl3f 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force ofbx(lk;a3 ay4c 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 runs up a flight of stabj y,mogw(,.na 8mb2 virs 10.0-m hignmyb(a28., m bvjo, gwh, 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 needdv6e;d myl )9bed to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by th y)v6lb9 dde;me 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 d82kw/3x i1qoq-kuhj.mplop:8 zi dl,h k s*7motor that runs for 1.0 hr? (1 hp = 746 W)xpjkzkodi1qplk, /28.hh s7iq8d -owum3: *l

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 whil7nux :a;byl3h qv;8o pe riding. How much force does her foot push with when she is travelinnvy7xa; 3o: h ;8luqpbg 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 ibl13ae5ooc4 z:cwgm 7 n 7.0 s. What is the average power delivered by the engine? (1 hp = 74cg4cbe17 l a3m5:owoz6 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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