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

1#

What is the correct unit of w9lduhe52 dq: nc+i6 zvork 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 ar3( k v: (jvrng/nyflf 14d5ms 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 against a stationary brick wall, the amount ofvt79:/ gdv(bhd) g92p okrt hf work you vh7 (dhbf)k:r/vp g2t9tod 9gdo

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 much wo az;chfvo47 l;rk is being done i;vz7;cl oa 4hfn holding the box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally fol2 z 15jr yd9ed:ii(mkrward at a constant velocity carrying a 10-N object, :2m(5 dili9kdyrzej 1 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 water3pujvso8po wo ,72z,n is lifted vertically 3.0 m then returned to its original position. If the to,2oow op,v3znu8j s p7tal 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 centripetal force acting on an object do wor6qvjkm)- rfn2k 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 u*ikbk-p 0:yoqp. Compare the sign of the work done by gravity while the ball goes up wi* kboqy-i0pk: th 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 For4)28ih ,eubuh s1d cj)h(eloece versus position (F vs. x) graph, representse8 j) heush2,di)lboc(h4u1e

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the workkb lh 1w-vv 8 (e3/vxzhiz93gn done by the force 391n8h k 3ez-ixl/b gv(vwh vzF?

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 p ewtrcyph .a8ckr :y3ad9ru r2x)-a+8ositive, 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 ihqnpkyc* k-m1o98 e0f s 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's kiqr2/lw9z;b6k-yp sc bnetic 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 asu+up *tl ,z3uv a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energ3u*z,ut +vlpuy 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 ha5xd l yjn- ui3o+o2i-qs half the mass of car K. The kinetic energy of car +qu2 i3-d5yx jnl oi-oJ, 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 original speed. Whalk)iwt /olxe13 jdy (r1:o(mh t is the ratio of the final kinetic energy to the initial kinetic energr /x (yk elloomji w)13dt:(1hy?

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 an3e7xmf w64uw7s(kf qnki -e)33nhn8jgo, ckid 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 rock's massu3)n33 o6nhsk-w ,47e7kig f(kw njf8 cmiqx e?

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.;mh:xi(8s ma.,kksu w A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greaterxsmu(k.,; 8 i:wmhak s 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 c 6emo3,ke*,ol8 m1u9km/xhs6 o xuhdaar in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidouslm 63ke eom9/x m6xk d,uh,a*81 ohded, 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. Neglecting any u/81 f9xzmt -jeie.ps.dv8w q friction effects, what happens to the planet's ki9vx8 q.fem -i.8jzt1us/ew dpnetic 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 principlo;7(k1cgrz( j)2cd,,wgq jg:t pi l dee.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potential e/jcarb(rrq*)wat9, how m h74nergy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second object wiyljl .gyizkh0(.l aby2vs:6 3ob57 fn th four times snio.zl yv2j:aykhbb yl.0 65fg(l 37the mass of the 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 spring causes it to stretch 5.0 cm./ panw-ee8 1 *dx0oc(z2inh ko If another 0.200-kg mass is added to the spring, the potentia8 w- 1p2oaiocznn0d(xe*h /ke l 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 oa9 2h dc :iuo;l2r+vshf 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 kiv 6 zi k/l46rrpa8rg;tnetic energy K, to its potential energytrp8vkr;/za 64ri6 lg 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 drivivsp3v(f)h2bdj;x( tl ng 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 equal speeds alokmrmwjid g;/9l k e(if4+:c(rng a level frictionless gcf elj m;4/kdkri+9mwr:i ((surface. They both slide up the same frictionless hill. Which rises to a greater height?

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

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses bnh)bjdj w.)8 qd*e8 )sbm8nz $m_{1}$ 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 conservati- ) 6.4ywgyvdf yjk cm.og.7mkve forces46)mmyydg.f c.ygj .k-vw7ok.

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building,uxg e/ q4;w /6ve)qstz through the air (air friction is present), to the ground below. How does the kinetic energy (K) jusguw6 tzqv )/eq/e ;x4st before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distancehndg3(y-* fi u and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy-3g*fn(ydui h 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 w+l0l)tsu,9wyvr r2sloses 30 J of gravitational potential energy. Do not ignore air resistance. w,su)2wrrl tv9sy0+l 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 conservation ofza ,mqdal ,uxf575sf5 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 is (7 rd4,ffzjgzgp;e 4t

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 SI unitsux7rn 7wd: z pmsci .l/0zqe20?

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 unip8g8(a ,;rgwaw scqk.a)nbus h,; :x vt 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 dt5ij 0;exkfz2 o so, your power zke2;t0xif 5 joutput 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 accelerr1v) q .(nj et-x fx)ju5ec)bkation, 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 2.0r a.6ry 3)9twg dhy59+gbg 7bq1 wdz3dy1ieve m and held there. If the object weighs 90 N, how mucdy1 gy)bewv9+t gw 6.1 97h3adrqy r5gzbie3dh 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 distance of 1.0 m, at a conz.ak2+trpa,br jj7zrr /-n )zstant velocity of 0.50 m/s. What is the work done byk7zbr zrrp2 z+ j /-,j)ra.atn 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 ))umhumt 3j(p4. gj* gkha7 pvpulled upward with a constant force of 5500 N for a distance of 50.0 m. Wh g*hhv4j)7 guu tj3p)mmka. (pat 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 diswo9*afzao) st a; go-7tance of 50.0 m. What is the work done by thefagosz)-aa*;9ot o 7w 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 constant force of 550/yaxrs ch0s3 -m1m u*h0 N for a distance of 50.0 m. What is the net work donesys *1mxm-3ra0hchu / on the elevator?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along a 0i6 h//6u:0c ix;ohj x j7zayhpdfvl2$37^{\circ}$ 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, inclaj 7nm(p ljx2rq-5qt,ined 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 Sarro17j)3tbj0gakzc ,x ah in a sled on an icy surface (assume no friction), witht3rbx)7j czjka,og10 a force 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 the force. The graph ih80xetz(uy 7 f)-xjkxn Fig. 6-1 shows the force versus the object's ux)e x07jzkf 8-thxy(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 gr q8tqq7 )5kfvcaph in Fig. 6-1 shows the force versus the object's position. Find theckf7 8qqt)v5 q work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the dirssf7+ zrjy7b9xf, s z+ection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w zrbzfs9y+7,s+7xj fshen the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force.(i2+ ef3 :colm*urp rqw;kvr3 The graph in Fig. 6-1 shows the force versus the object's position. Find the woreqrw k2:mocf;r33( r+ uvlp i*k done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initialpq if93d6vz6 ab7z1 taly at rest) across a 10 m level surfavzip tzd 6 6fa9qab137ce. 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 Nsp x+j0ns sv(/if z9s4 is applied to move a 55-kg cart (initially at rest) across a 10 m9xj(/s zs vp+4n ifs0s level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with 7 dew8r:+tk sba speed of 5.0 m/s. How much work is required to stop the mass? +dwetr7s:kb 8

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 initi 7zmngqc a5:f7ally moving at 25 m/s, what distance is required to75q a7mc:ng fz stop a car moving at 50 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 gun propels a 10-g dart. It is cocked by exerting a forcle5; dm-nrny/ e of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the springn y rn-;l/md5e has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component of 60 :96v0c9npcizjn cy.l (h*n jvN. The force is jl* yzn0c69(hn. :piv cj9v ncapplied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's 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 +v+il)2dzw , uedra//du)xav horizontally into a bale of hay, striking the hay with a velocity of 2 /)/xau+w iaudr ezv)l+d ,vd60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above i,:z n1.le kd2xtemj)a floor to a height of 13.0 m m )eit:jn,e. dk 1z2xlabove the 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 i ve2o tthg2d16nclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane t2 h21te6 dogvis 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 stretch 2.0 cm. Whaep:go dxaob.v x; z6/,t is the spring con:,xbd; px ga.6o oev/zstant?

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 dsy8)i gov,/vpotential energy does it store, when sts i/vvo y8gd),retched 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 uncottf -hv1. g7gbmpressed spring with a spring constant o.7th gvtgbf1 -f 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m froe0s o)t ,bl(dh :ilnn3m x = 0.20 m to 0.25 m? (Assume in,0(tdenb)l3h so: lthe unstretched 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 (-c/gg(ss sbp constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress ssbgg(-(ps/ cthe 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 7pu0io 2j:wxbthe top of a 50-m high slope. What is the speed of the skier on reaching 0uj op27bxi:wthe bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the* ux.pl1+gr cq top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving af.c+ulg1rx p* qter 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 indnh/ben cu+fka06 /+z clined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the planfn+ebd/nu 6h k0ca/z+e?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the fltzu,-9gto7 s-)k b yjxoor, its potential energt jb)uxkos,t79zy--gy exactly 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 from ground level with a kinetib nw)z02j 8ztuitv,232sbs c kc energy of 40 J. At the exact ton0bv28zc twbtjs)i2u k, 3s2 zp of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic ene(s ;0pctm/o61hba 4 ohw(jqm w*jt4aorgy of 220 J. At the highest point in its trajj/hpt4 6c tm(*o sjh4am 1o(w w;bq0aoectory, its kinetic energy 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 above the bottom pdjv 2o+4 nl8 xld/um+.4 culhbqn0n(of a dip (See Fig. 6-2). Ne u.bllp dx4+dl8ju(nhqvo/ 40cnn+m2 glect friction, what 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. 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 mfztn 1f0t gb9 :u.s+nu above the bottom of a dip (See Fiutf1.n s+un:f 0gb 9tzg. 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 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 a ogyhaalp wie-wo8b0f6 1.8/gbove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the 10f8oe8w.h w-aipgo /lagyb 6speed 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 speedretal 1z* mr5: 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 2-kg pendulum of length 50 cm is pulled 0.26 m away from the vertic) hf- veeqmcl.nu5(/d vgc5j8al axis and released from rest. What will be its speed at the botcj5.(c)8demg5 nlv u -hqf /vetom of its swing?

A. 0.3586 m/s

B. 0.956 m/s

C. 1.435 m/s

D. 1.196 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 movingt-( khkmbz+frv6ry :beo/+3 e at 25 m/s hits an initially uncompressed horizontal spring with spring con+v+(z -:ke/ tbb6fkem3r yh rostant 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 27g +il+nv c cat)o,zx+2 m/s, slows down her 2000 kg car to stop for a red light. What cxa+i+7zvtn,g+o)c l work is done 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-kg object and a h ecur5w7*;.k3xen( jafr9 rws orizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, w3.sc(w; ra rwx7kenfj9r5 u* ehat 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. Itb 1wr1x3ga l;h has 24 J of kinetic energy. The friction force on it is a constant 1xl hrga1;w3 b0.50 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 level80*itpd uk0km surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If ti0tpu*k k8dm0he mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top ozwb 83 6o7odo p85qtr40fsun hf a 50-m high slope. If the work done by friction0 54uqdzh o78r3pnt f6wo8bos is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long ands o4 aqf you+gzh6: g,)(x8inq rises 2.0 m. It requires 3200 J of work to get the box u xf)(qing g+,y q a:hoo64sz8to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e abo s)ms,poujf n k7rggbrq (1hx(3 /9)kove horizontal. The coefficient rsm)3po1()gk,q b9grx ksu/7 n( hf joof kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes theplws.z6 m/z ,d; iptgan/ep .) ground with a velom.w ;,p6z de) zsn i/tl.ag/ppcity 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 e:k.g:sql 7bf4.;bct jy(he flnergy when he runs up a flight of stairs 10.0-m ffq hg;:lb4tc l (.yk:.7sjeb high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move/ 8izk 7ux) xqtbvz3wr:q8-fu an object with a constant velocity of 5.0 m/s. What power must be delivered to u8 kxf-z:)v i/ut3qxbw7zq r8the 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 1.0 hr? (1 ljc8zs 6 7fb 6-lyhgxi76nm w2hp = 7js6cnmxy 8fl66ziwhl bg 2 7-746 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 whik3mc2 g+dde8p le riding. How much force does her foot push with +pegcm8 2dk3d 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 accelef - saya1;g;herates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hpfa-aey;hs; g1 = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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