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

1#

What is the correct un *6qukjo,if+tx2 x 6 .(plykypit of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a s7/om jfgbkq*: ystem 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 w)sh):sdg4z ld5klpx :ub /p+ call, the amount of work you do)d ckb5z4pp+:/lgx d:hus) sl

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 md *qqn 6 .q28h m2iuxsaqt,uc0uch work is being done in hhq,t .q n8c0aus *6xuq2d2q miolding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying axqxs9.d++x 99 dtzfhj 10-N object9fjd9.d9xx t +q zshx+, 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 lifted vertically 3.0 m then retueo8tx/. qunre: ffrt9jg *n6 :rned to its original position. If the total 9uoetn:t /*fre:xgr8 6f.nqjweight 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 3p1zu 9t 9j8u ylkixm+vy6x+racting 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 c5prw/ v5dj p5o)x-q.l3k kxithe sign of the work done by gravity while the ball goes up with the sign of the wolo5-kp5j v.x/p )qw5 idcxr3 krk 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, onwl49q b p8k.rno;yr0 tki7 9x8aaxc3 q a Force versus position (F vs. x) graph, representsbxk9p9ak;07lwc arn 4qr3i.toy88 xq

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 vsna*5rk rxf 1z,. x), what represents the work done by theka1nzrx5 , *rf 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 positi3 g*6cvr.im yyve, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the objectxg n bohf1:t b-:vann*i) ,8dpb)c9ld'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 t :xh gxwq74/ x4z11gkx .zvntzero, 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 mu9vpg5fk0au m ;z5 chv+ e6h7sn5xcj,wch as a car, and is moving at twice the speed of the car. Which statement is truasmv6nj fhp+0 czhvc5 ;wu 5x9k7,g5ee about the truck's kinetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the dy4:uch/ i bn6mass of car K. The kinetic energy of car J, compared to car:cn6 uy 4bdi/h 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 wal *ai y +cnoi7(na-k npgd2:xszk 5l7p4l and bounces back with half of its original speed. What is the ratio of the fidala x:7z-p(ns+on7iy*c4ig2 kk np5nal kinetic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a - rrz1zy;v6oa of 8,t.wuh gg,speed of 5 m/s. If both objects have the same kinetic energy, what is the rarz ,6-wh1azg8 y.rf; too,gvutio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass 3s v8atl0sb(sydqn03;sv1e+(0 mir-i p zfcyis moving with speed 4.0 m/s. Both objects encounter the same 3se3rb0mil(q0pftavy8; zss(ns-c+d y1i 0 vconstant braking force, 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, and skid a certain distance 1l e 7f3:61yiiwdbp aion a straight, level road. If you had been travepbl f:1i1iadw73 e6 iyling 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. Neglect brg ro17 ;h* bpr4zkvote/6f7ing any friction/ 6rr1v zh4r7k7o;beft* bgo p effects, what 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-energyn/g. 69 mprc;wp nt-dx principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potential energ pj/qc 19j24 d-uhbmznx;gax8y?

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 8;: xpoc + jkkt/iqfz2height h above the ground. A second object with four times the mass of the first if released from the same heigh;c :zxkoiptq+k8 /2f jt. 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 ch -+ew4umsm6p/p, gcz408a whrzm*w y auses it to stretch 5.0 cm. If anowp40,*8 s6 mw/mg h+y-euzcmh pwzar4ther 0.200-kg 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 eng.yi2ocv+9 o oergy 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 potential +0+lb o7kstvsenergs+kotlbv s07+ y 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 drivingx/w aq*6 p/ f+oe9wupc 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 heavy47 o7rr.i5o*rbhbihv qv / j/ee3rr-j object are sliding with equal speeds along /jq5h bo 773 i-/b4 rr*oeerrv j.irvha level frictionless 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 1q,x/d+i adtjmskn5/$m_{1}$ 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 c nu7/p x3fm9ddonservation of mechanical energy for conservative forcesxm3 n7u/f9 ddp.

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, through the air (md5*xkbamg )cbp53p :b7:ctj air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground 5p3m*x5bcmj:tpg:b) c dab7 k 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 andy e6gjj, coy;z1ha 7w: gains 30 J of kinetic energy. Do not ignore air resistance. Howhj z:,ge6ya1 ;7jo ycw much gravitational 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 ehza+bybyq1jt* de: 7hhd 6r3r8hz p 2+r o;ke3nergy. Do not ignore air resistance. How much kineti3r1keqz+bye;z rhy+ 27rh6a*bpdt :3d8jho hc 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 confxorgmbly2 y15j .z/ /servation of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is*l27 fo ufbju17v g,f-mq xgn5

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 exprki(br)z i m/r) ,qnfkgo.*9 ahessed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of lh1faws g;,/i 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. *nfyw-61smv ;)wz bf bj b*zk1To do so, your power output must h1k; sj- w nbb1b*)vw6m zy*fzfave been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's enginey; d5c(m/ tagk 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 helh)dla/ou/volak x75 ;d there. If the object weighs 90 N, how much work was doneo)l oku/a5 xh;/adv7l 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 distr 7kvr t(0acl-ance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work d-(tavlr r 70ckone 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 5500 N for a distaman)5 k9au /henceueank9/)h5 am of 50.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a g2zeqo: 537.p h4n lcqzzb2hb constant force of 5500 N for a distance of 50. n.bbc 5z3h7qghpzqzel : o2420 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 up*yf:*khee / fnucvl(us-f i(*ward with a constant force of 5500 N for a distance of 50.0 m. What is the net(u:* k i yefcuv*ffslh( n/*e- work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up alo) 2+ k370rsm o+rs pgitamc,lrng a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclin-6gj *sy)y v(ns s7zgved 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 li.uj4)r ic eum0 hhh.f(ttle sister Sarah in a sled on an icy surface (assume no friction), with a force (. umc uhj0)i 4frhe.hof 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 ia 88y8o),i(qk t gjg +qlzasi5n the direction of the force. The graph in Fig. 6-1 shows the force versus t8(5i gs j+8aq qko8i,al ztyg)he object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an obj: smez 5 (*ufr,oboeu3ect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find 3m o:rfuub *z, 5eeo(sthe 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 direction of the force. The graph in Fig. 6-1 sh5nfy1 )ymj t1f h8d2ztows the force versh21fy5yjtznm 8 1td)f us 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 forc7d m7yg.h.oz1 ao6pbc e. The graph in Fig. 6-1 shows the force versus the object's positiz gp7.1d.m6hay7cboo on. Find the work 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 (initially at razjx5s4p.xlu / fl29 e .e t,ih0cgfcg6qa,z :est) across a 10 m level surface. What is the final kinetic energy of z9 xai:ctu ca506,. 2q,f jzf ghegpx/ll.e4sthe cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg carmdwbz 6 i2ck26t (initially at rest) across a 10 m level surface. What is the final speed26bk mwdc6zi 2 of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much worn d-- gmt 9r9dq9d eijicw.n(9k is required to stop the massjr -gi(d99mtenwdi. n9 c9-dq ?

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 ;. 9*c vg jhepe.gal0lat 25 m/s, what distance is required to stop * vh.c;jge. p0e gl9ala 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 guqyp*komh 2 /8ao0ee.2lqlb *v n propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring h a qv.kloy*l2oqe m/hp2b*0 8eas 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 verta,v/d3gmi rb p3ny ,r1c s43orical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from opvr41,,r /iya3bdrn3csgm 3 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 g6rb( 4 yq q.tgk;3s/xrqaald *w5p3ne is shot horizontally into a bale of hay, striking the hay w ; 3.4q/ q*ad3rqsn x(lypgertab6k5with a velocity of 60 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 7on 84g0is viq6.00 m above a floor to a height of 13.0 m abog06n 8soqi4vi ve 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 inclined plane. Theqev x k; p+uf)1x8+pjw plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the push?)ve+wxu kp+1;q pxfj8

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 bf s bwdq893jb*j1,ccf 6y0kwspring to stretch 2.0 cm. What is tkj , bc1jc *qfsw30b6b 9w8dyfhe spring 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 characterized by a spring constant of 60 N/m. How ma2g7 cy7p/qljv4e j:vuch potential energy does it store, when stretchedag7el/ j72:cy vp4qj v 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 comhvd h ots78gs34 9cd 2z;r9yb*u.t uripress an initially uncompressed spring with a spring constant oohzus9d9*4rs.; vhbg27yr dut 3 i c8tf 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 coz,rpvrvxv/70/ p d jojy l (md9k2)b(bnstant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is arvmd( kzvb 0,(2ov/dplxjy)9 rp /j7bt 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 comwu0( 3eize:iapressed by 3.0 cm. How much work is reqa : ieuzi3w(e0uired to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts fr ya*rqpzy-yfwbe3sa 20d26 (rom rest from the top of a 50-m high slope. What is the speed of the skier on reaching the bottomrd e 6w(ypa-02fysqz3byra*2 of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 4irgy5 )jj ),:j;bqtum .0 m/s. Neglecting friction, how fast will she be moving after dropping 10 mtyj:) q,b mij ;jr5gu) 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 inclined plane. At the box9 i4 ,nm7jqv 3ohd;rdttom, it has a speed of 9.80 m/s. What is the vertical heiv43 imhrdno;j,9 7dqxght of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its tmj-xb *l9v+dpotential energy exactly equals its kinetic energy. How fast is it movingbmltxv * +9-dj?

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 4vc( hjdthp** uf(6g,b 2z m)asw ce4cN, blasts straight up 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 doe4p*(t zc4h62)mje c(v cfwsa*bu g, dhs 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 kine) xz,c +2uexeytic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, rela,e+xe ux)2ycz tive 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 poo4flsu n)w y dd62bj6m a8mwww--y,f ,int 45 m above the bottom of a dip (See Fig. 6-2). Negl4s-wb,d68ajfmyw -2on ud )6,mwwfy lect 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 m abov0o/ w5djevrirm n .(.n2gq:zre the bottom of a dip (See Fig. 6-2). Neglect friction, what nr0rgn qi/.(j:vrdmwoe .5 z2will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of q 5lo8pqaps -:ilqz11 a dip with a speed of 5: -op p iq1sa8zqqll125 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 the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the g.k k+8ygyw jzr/i9 :lbottom 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 lengthmg p 0jlwvn m5gnh4*40 50 cm is pulled 0.18 m away from the vertical axis and released from rest. What will be its speed at the bottom of its swmvwh4 50gn0gmj n4 lp*ing?

A. 0.243 m/s

B. 0.649 m/s

C. 0.973 m/s

D. 0.811 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 initially unco :br0omns+:eq7s,zmwv )8rdpmpressed horizontal spring with spring c:78m,so:sbzren0 p + w) qrdvmonstant 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 j;clg h0)1y l5.yonoo kg car to stop for a red light. What work is done by the flj5o;0y h)oc1yo ng l.riction 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 horizonx38)s u;4iw djfu wt9ptal surface is 50.0 N. If the4f ;s8pdw ti u)ju39wx initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving -htzdiu:a*k- on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N.z*i h--tk a:du 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 levekq 0wqz.l97j u(pd qp,l 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 wq d9qlppu(z0k .q 7j,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-zny6v(t hsqw5wck(;7 m high slope. If the work done by friction is 7;(6yvzn (k hqwctws5 $-6.0 \times 10^{3} \; J$, 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 playtv;er-g3( -lpz l4k nne. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction fo -lpzv gr34n(eky-l;t rce 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 at3,rtuw d67h*swhc/(fc hdgh - 20e above horizontal. The coefficient of kinetic friction between the mass and the7ud -*g,6 h scfhwwr/3htc(d h 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 strikesd/dui 8ur4 e+y the ground with a velocity of 7.04yd/+ed8 iuru0 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 60.0-1bfj q/6 hx0zmkg boy using energy when he runs up a flight of stairs 10.0-mxb j6zf1/h0qm high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an vu7 r3bnim*( s6p/*m tptu0et*2 jmktobject with a constant velocity of 5.0 m/s. What power must be delivered to the objetp0k t3t*pt b6/unm2v*e mr(muis* j7ct 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 zyw1 jf. 0t)zvu+m6 sw1.0 hp motor that runs for 1.0 hr? (1 hp =su1wy 06)wz mj+t.vzf 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 ofm 6py7kj 3i rpz,bk-c8 500 W while riding. How much force does her foot push with when she 3izry- k8jb7m,k pp c6is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the 23ib0 s . ffniog9e0lyaverage power d. slyfne9ifg 3 00i2obelivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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