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

1#

What is the correct unit of work expresse8x)wv cs ryp**d 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 e*qxjv q9xd 3du (v3y jw9s2w9a system if there 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 againsznf5mn (81. h, (p mbxotohds,t a stationary brick wall, the amount of work you dp 8 .1 dsznonh, htbf((om,5xmo

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 there. How mq2b6oqkvcb :355k;ibtib),ugn0n n uuch work is being done in holding the box in this ,t niocnq) 25kubb q bi:;b5gn0vk 63uposition?

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 constant velocity carrying a 10-N a1(/rke -wif+ x) pspdobject,(xp+ s1/ka- wpr)df ie the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lif;ev 6x3bfa2m uted vertically 3.0 m then returned to its original positio6uf2v3b m;e xan. If the total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetalk(cg s6k9 l)pj force acting 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 straight up. Compare the sg.po. i-izwvtz b o (*/sm08yiign of the work done by gravity while the ball ggtpzi v8ibw0.oiz* /s- ym(. ooes up with the sign 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 (Fq h5 18jws56) fhmv; .7qjyomnkprqk - vs. x) graph, representskjmhrmnv y1f5wq-os . q6)j q h78p;k5

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 -,o maj1y9gij jj ss9 m:gam(/ v1ll7yrepresents the work done by the fy7/gj-s11al:jo ( ,smaj9l i vgj9ym morce 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 positiv4ovy. zaa0(grri:m; ke, 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 o. k(x-csh jl4qbject 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 isnoc: -k psy+0hx)p) wk 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 movingbg lx 9.380jxba gxqigc 7fp0nq82-ue at twice the speed of the car. Which statement is true about the truck's kinetic energy cq.pgxqi xg28 3ab7xnj0f9-ubgc el08 ompared 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 massq78x5 xa3l w3kxjph:d of car K. The kinetic enerk7xw qax83x3jphd 5:lgy of car J, 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 half of its hwz n o;g.h(8uoriginal speed. What is the ratio of the final kinetic energy u g ;n.hwoh8z(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 and34mx .zjhj j9z a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rockh3jj4z j9z. mx'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 sp)cd)yctcvkc30 z *u r1eed 4.0 m/s. Both objects encounter the same constant braking force, and are bro3c r cyzdu )c0kcv*1t)ught to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and qvft ;7tjnk+eg k;,m0skid a certain distance on a straight, level k;k qg; e jm7tvn0+ft,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 or ztqjbi0+rp l*q6g5q;pw r7x7bit. Neglecting any friction effects, wh 0z+gp7 6jlw* bprriq7; xt5qqat happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle.iz7k9+ wbzf o7x.: xmm

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 syst8r t)y prw-4y0 t4bkto as3im2em to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A seconp;tb-9xz a s,+cm7j xbd object with four times the mass of the first if released from the same height. The potential energzt, jcxb9a-bx 7 spm+;y of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it tou+1exjzf.yb/m8:+t kyt+lbk i aa)d- stretch 5.0 cm. If another 0.200-kgy.ib) ftykjl ma/z8+b ut-x 1+ke+a:d mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a s hbvu 5qn9 ea/sb1s) opn;ow*;fx-p-wystem

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 pwaxi4b(hq0tk0t u)0a tree. Compare its kinetic energy K, to its potential energypqk(0w)tabx tu4h i 00 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 dri*d 5xr w207mwnfbp:yvving 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 very heavy object are sliding with equah8 t) it1q hbu2875niuidzxn8 l speeds along a level frictionless surfaqu28h88u5 idx)n b n ti7zt1ihce. They both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses ;mt20zw--qf *aob0 a3 r 34gnjprb nmx$m_{1}$ 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 mechania9l d5xysn7*ycal energy for conservative forces.7xy59d sl y*an

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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, thr 2gxmqfp1 fq 8z,uw ,bn02ppgaw919z lough the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the g 1zw9fl a,0n,qz 9pp8ufgbw1p2 gx 2qmround 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 3 nfvssj0b+e13fct y 8x:3xw 6a0 J of kinetic energy. Do not ignore air resistance. How much gravitational potential ene 0fxj +yvexwtb 83nf sa13:s6crgy 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 en4 e9+q.amxp: /ai y pzxc9.atlergy. Do not ignore air resistance. How much kinetic energy did the ball ga t pemz9+a9 lyxa/cqx.:.iap4in?

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 of 5m2bzpru9d4b9 q 7euy energy.

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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 iskw b0k u+7n8dyd.c8c6rq +*ei,eil ew

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in S(f rg 2sn7+mb*cpoguj;i g9xmpl- 9n0I 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 pvsx+k. 3nlrf9 hj.0qa ower?

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. 6(lk ks*vhiokr r 8w+-To do so, your power output must havl r- wh8r+ksko(6*k ive 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 const x7srk: s7gqhfyn, 5nmw0f(+yant acceleration, 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 anvind;42 9njp) koy1ho hn0hh2 d held there. If the object weighs 90 N, how i hh y4 jkv;22d)ph oh1nn9o0nmuch work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distancztrzx4z n2ycml6 3r; 4e of 1.0 m, at a constant velocity of 0.50 m/s. What is the wczmzn6x34lr;r2tz4y ork 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 u+uhc (f*kwjd(l/eu,z-ap b/j pward with a constant force of 5500 N for a distance of 50.0 m.ah(,b+-jeuzklfj*( u/c/ pwd 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 pulled1aq*y i 6vcew-:8 .aoiwz0gdy upward with a constant force of 5500 N for a distance oq -oy8i1a.0 a:v*6zye wcdwigf 50.0 m. What is the work done by the weight of 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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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 constewl h:kf*4potcp +s jzru(5).omc2,fant force of 5500 N for a distance of 50.0 m. What is the net work donc )4u:lowt+pf*,(oph k j se52cm.fzre 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 6.0j,m 2 s7r ixxnhop*y,)i6 trs2 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruitkj7ak5rek :/w:vtw hz, kh* c1 slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah irm;zns0u5b9 c n a sled on an icy surface (assume no friction), with a force ofuzn9b50cr s m; 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the forc4+cy;r u ot2h4i0 j vm3x)r ra1pjo*mle. The graph in Fig. 6-1 shows the force versus the object's position. Findlm+r4*) 24j r0yvhua t;orc1jxo3mp i 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 graph in Fig.y,98uxs+em 11zwf(aa ygp4 oh 6-1 shows the force versus the object's position. Find the work done when the objesg1o xm8a+,h1a zu f(y4 ywp9ect moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction :6oslg 128-v u raleslof the force. The graph in Fig. 6-1 sho:a1 lug-loes vrl268 sws the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fo8 6t(9hibqptmyiv ,0crce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mo ,q 8cihtvpytmi0b6 (9ves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200a+v lxd9dv9mwt 8g.gn) t8) jc N is applied to move a 55-kg cart (initially at rest) across a 1)jvn+8 m9lv watcx.gt9) dd8g 0 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 g- fg/5fc1 lxh55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the 1 /l-gffgc5hxcart?

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 wkt gb2t ady8150w o(gvith a speed of 5.0 m/s. How much work is required to stop the1b0owa2g 85 (dyvtgtk mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially mov- u.- kw6)-nxxze) ao4cf4owcavi3 fnsgjh82 ing at 25 m/s, what distance is required to stop a car moving at 50 m/s under the 4-fw. u)4jag) cfiecvk8oahn zx-3nx26wo s- 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 dartr79+v1)mfdsc f zps *z gun 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 spr1scsrmz *)z 9+ pvdff7ing has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component rv1e . e3gb bcrvupqh5t1)4l* of 60 N. The force is applied to a box which rests on a levelh v5 lr 1becv*).pe14ru3bqgt frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into aa3qyg.(blg(o3 sox,e 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 3gs oe(a,( qlg.ybx3oaverage 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 heqkbgs7 b *z21light of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravi 1l7g bk*s2qbztational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and 58 ;ngieg,6 iwpau ,pi3,bmkyrises 2.0 m. If the plane is frictionless, how much work was done;mp , yg5up,ibeiig3a68,n k w 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 ont *v solx7h*ic+3p .vyto a spring, causes the spring to stretch 2.0 cm. What is the spring constan.yhvpsi3 +x 7l v*c*tot?

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 characterq6jsg:y)ei pp h /,5/pek2kbyized by a spring constant of 60 N/m. How much potential energy does it store /k)p,bjqgp25i:k6spy/ye e h, 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 compress an initially uncompressed spring x0 geu (6/nepppwv.:bd2i.sx k 8i8ddwith a spring constant of 25 N/m by 102d/pd.s . i vie8(ugxdkn 0:8p6 wpbxe 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 fromk( 3ox b9w+)woul2heiijc gnm3*7f .m x = 0.20 m to 0.25 m? (Assume the ic *f3o n+bejw.kgouxw32 )m9li(7m hunstretched 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 conuc2xy lu 1cq sij;,9n2stant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 9us2 lxci2ny 1uj;qc,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 r2.;op o- sohilest from the top of a 50-m high slope. What is the speed of the slier on reaching the b-o2po;.l s oihottom 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 speed of 42o5j0 e6lag (f*kulwk .0 m/s. Neglecting friction, how fast will s0(6j kw goau*e5k ll2fhe be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless i zd,3sffh/5ti2 k;bmo5wp* cvnclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of fs;d*5/ivz 5bmoc kht3p,2wf 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. Wh0+tcs+*9b nbzx6 xo yw.x*uvc en it is 0.70 m above the floor, its potential energy exactly equals its kinetiobc+w*xxc0x .v+tuby6 z9s *nc 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 g+drc5 4p3h.;6pk4pmf gx cwl from 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 do+p4. 6kf wrxgcg ;dlh5c43ppm es 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 a y4mctyiil+9me ; (4eenergy of 220 J. At the highest point in its trajectory, its kinetic energy is 1+m 4e;alc(y yi49etm i20 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 fro9e ggc+ra4t a,m rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the nexgc4t,e ar9 +gat slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above 8cbc*d:lsw- nqw m1f84 l4ouhthe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the spee8*c-lw b fdc nmuwq8:4lh4o1sd 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 3i,p 6yhru0tqqoqs -)m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). s0 ,r-qqou)6 hiy3 qpt Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the 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/:vgm; fxerh ( 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 the vertical axis and relep( 4wj y(b4)wdkt im2aased from rest. What (y4iaj( td)w m24 pbwkwill 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 gs3c(olmd4gae ,cvdjss+iff0;0 +o 1 at 25 m/s hits an initially uncompressed horizontal spring wit, 4 cv(gsfl 3gdo 1fo0;++sj0esicm dah 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/s, slows down her 2000 kg car to stop for a reugw hxhiw 69))n,o6 i8ookig(d light. What work is done by the friction forc9gu,kn)hwioiw o)gx i6( h86o e 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 60.0grmqo* :g z1e j :c.-dpl*ak1e-kg object and a horizontal surface is 50.0 N. If the initial speed of t1eg *g-:pr zq e.k1oamldc: *jhe 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 l * wv,cot6)kahas 24 J of kinetic enerwl*)ot cva 6k,gy. The friction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. ia6d ,*noov97lrsb5 tf07 t bq The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of9bia5fvlsd0, tro7o *7tbq6n 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 work d1 xw cg..i0b4m xor)feone by fr1 re.x.mw0ixgobc 4f)iction 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 mq*z*,5o0u cot0hrn ji2tu d1h long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the bozu*0h5h c*tod nt1qj,2 iou0r x?

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 20e au(e9u mx l0b3 yb/8gpjn20lr above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be j8 n/x039(b u 0m2elalprygbuthe speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10kt(h0tp9 pfbnb. jyi;0 i 8yi8.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts onp .ht8 nib;i t(b08ypkiy0jf9 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 runecb/;j(8frz4oda *qws up a flight of stairs 10.0-m c4(*wz;rajebof8q / dhigh, 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 velocity of vd6mvnl5 ql8p8yp8 -v 5.0 m/s. Whvm -v5q d8 6plplvy8n8at power must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that rmgo+2 y kxqp88uns for 1.0 hr? (1 hp = omkx8+g8p2y q746 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 much force doe.)inxp y1brc( s her foot push with when sh.1rib( np)cx ye is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average po.)0njc roe du vg, d:kn()zq7bwer delivered by the e d qj,kd)u 7gcn :z.0()onvrbengine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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