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

1#

What is the correct unit of work expresse.c;; wjriy d,5van h+xd in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no mot (nxg h+um1b cu3nf7j;55uiot0pgs;xion?

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 hardd5ru75nenu 819zkd x x against a stationary brick wall, the amount of work you end8uzk175 xurdn5 x9do

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 m2w). aaabyt*5x7yfd 8u8e wvmuch work is being done in holdiyba5m .v*)w tafya 887e2xudwng 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 veloci 6 7 *1,9fikvo6awjqw wea/nkbty carrying a 10-N obek9 oa/w ia6 f*kwwvjb n,176qject, 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 d5q7po.by *ueww +-wh3.0 m then returned to its original position. If the total weight is 30 N, how much work was donupw de5bw7* +w hy-o.qe?

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 h.)utn i1as;:re 3*k zo:fj ygdo work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the workg50 lbv)qk3ivw.e 9e n done by gravity while the ball gn.b 3 v) 0lkve5eq9iwgoes 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 (F vs. midds8ukk:;i39:b ix x) graph, representsd:d;i9mik8ukx 3is :b

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 pot3u :qvkqnr;gs7)02klmg )zssition (F vs. x), what represents the work done by thqgs;k2) 07) k uvtgzmqr:s3lne force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kinetic encb bz pr1s,y+0(icr8 gergy

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 object's kine h15is;b lir8ytic 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 objectcas7 r6 ne9 lpxi ar1+me :ux4uc-ka*4 is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed of the (uggn -re1m(fvk9jrxa* .d6pcar. Which statement is true about the tru(m.1 vnd*( g rpruaegjfk6x-9ck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of car K. -w7i,j 84dcp9bprkd7 : kojbb The kineticbd 78-p7,k ri bbcwjop:kj4d9 energy 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 original speed. What isxo t28 sj0p7ob the ratio of the fj soox0 72p8tbinal 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 pebbq5a4v*a*anfu- n6b vmle is moving at a speed of 5 m/s. If both objects have the svn6f5 aq**vnu ma-b4a ame kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2f /z d9g5zhx/d.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encodz5h/9f zdg x/unter the same constant 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 brakb qgyd98s qufbxt:bb,:pgc 8r;5f da8):1g ades of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, unb8s fa9qf a: t :xgud;p ,cg8dq:r b1y)gdb58bder 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 masj*s92zj,j ca vw+hvq(s orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the h9s vjv 2 zaj*(j,c+wqplanet'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 prinyqc1s2y n42 zaciple.

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 43 :nurzu96lmdi z b;y w/idcm6xmo:.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 releasesq+)yu rjo e l2yj/9c5d from rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the first cjsr25ujely) y /o+q9is

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. I 4uqm0ldw(br +z9* rll9hd9kpf another 0.200-kg mass is added to the spring, the potential energ49 9u qdz9 (rblm*rlp+wd0hk ly 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 ofc(ch /a52c2:gtzsct)8b gk me 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 treew)3o59 4 1j.tv j8 nft,aiwqisrz05n-edi nrf . Compare its kinetic energy K, to its potential enert9 dv aw0w) .-n r qo8ni 5,3zjisf4nr5teijf1gy 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 d)xr, abw7n9coriving 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 objectkfiu6 l (m4sa h)i)sx9 are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whichhaui 4m9s (kif)s6)xl 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 vg33 fv5zq d)c$m_{1}$ 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 conservat lf9ze2je5tl90zgg o*ion of mechanical energy for conservative forcesefgjl5 29o0el* 9tzgz.

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 bu)l jfbqj*7: b bvutdb)9bcu.2ilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential e.vbbb j)fqt:c dubb7j2)* 9lu nergy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not ignorw.r ey0qxx04jq+u-r we air resistance. How much gravitational potential ener.rejq0xw rq0+y -w4u xgy 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 ener;+ gz0-noshtd gy. Do not ignore air resistance. How much kinetic energygo;dsht0z- +n 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 conserruatvdt7) z*h7 jia6+vation 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 ekfiupbxf b9( i5 1,mrfzgi(-*g8q5a

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 in54al o/gtyk jh9hvjh 8*:1 ypt 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 power4fd p;6ba/mbu ?

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 )3s xtuw.:xw7hayo .-(zc h tuthe work in one-third the time. To do so, your power output must havezot.uhwu7)xa.ws-y ch3 :x t( 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 constan pb;vd ++ l95nwcpsrf1t 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 and held there. 8q)ht)9sqg fr If the object weighs 90 N, how much work was done inqtq8fghs 9))r 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 upt o zb)r)d4b;m in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the dm ;t )oz)bbr4book?

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 jmfkx.uf 7xl 1 );0easof 5500 N for a distance of 50.0 m. What is the work don e f7.sjxkmalu;f0x)1 e 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 up4 ti9g z:7v aa/z7tso:hrrtd6ward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by thz9 7zr4t:rgadst:t a/ 6ihov 7e 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 5500 N for a distae8wgcsc7lex;cl;dl6+ g kxf wm.5.- cnce of 50.0 m. What is the net work done on 57lc xelgl. wsc x;ec;6m-dckgw+8 .f 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* 3ymtx 1yvmpymp p2(2o8g)fg 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 drhita3 m72 mr14 p1v+kfl/ jxyown 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 in a si7b5 161mg, fzm g nck:6x halq,)7naw s:sdjlled on an icy surface (assume no friction), with a force of 60.0 N at an angle osl,5mfn677lhsq6:k1ndxa z jm1 ,:a ig wb)cg f $37^{\circ}$ 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 dir z:psl m2nr,z 8c(s8-2/dpkz d9 aeoddection of the force. The graph in Fig. 6-1 shows the force versus clk / ddz29zdn2, 8-eap(mszpo :d8 rsthe object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grapvaib uy8+ayh5lr(p .9b (/uk (fmog+ah in Fig. 6-1 shows the force ver(m+vr+ u8g.py(k ufb a5h l(/ 9baiaoysus the object's position. Find the 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 su+t9f /o38hk:pkyd do:97ebmp-*hco s ej7tm hows the force versus the object's posit7o tfu +pd 9 om hskk c78eymbd*3:eo-h:p/9jtion. 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 force. Thexhku5s lb0xia1 2-oo ) .uzlmo8hodf)op 4* *l graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the o0foo b5)-o)l*.ui laxmh ohpos *2l 4uk8d1zxbject 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 t5r1:6 o vjgeoskfflad qk*9+ /o move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final/+ ff1a5:o go6k eqkjvlr9 d*s 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 tovxo5r*x-fq 1m6 r/d2fke5lfe move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the rxv1xf*e56q m-/5dl2ffokre 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 w k2o dt-;xlsm /2 u.j -hia7oxdl6p2w8 2tfovlork is required to stop the mas2 -/tksi.d2x x mo7-2d lvl6wuf pohtj2a;l8os?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, wh /yhk08r48xh ,vab mncyq d*m9at distance is required torm,8kd*ha9ch0 x yqvm48y/ nb 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 da n0xj/d ,kwca4rt. It is cocked by exerting a force of 20 c, 0 an/wdkjx4N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a-7i1 ob kh4)pcigpr4z vertical component of 60 ) zpp-4k1gicrih b4o7N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. 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 a bale of hay, striking th-i+9 pt)kwqt ;3x+ jv3n ez-q s*cklhpe hay with a qs )jwkxn tv--l+cktie39; pzqp +h3* 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 7.00 m abovxgnftso :9lxx(7 64h-; bxgzve a floor to a height of 13.0 m above the floor. What is the change in gravitational potentialz;s4l7x:g6o 9xvgbfn-x thx( 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 lonayj1ln 0 9zg1gg and rises 2.0 m. If the plane is fricgnj0 9ag11zy ltionless, 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 springm0ue zc1 i4xc53wm. ne to stretch 2.0 cm. What is the spring constan wcc.e53n14xm mue0zi t?

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 sprine- towi;j wvzx9; 2ov.g constant of 60 N/m. How much potential energy does it store, when stretched by 1. ow;2w jivtx.9-v;oe z0 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 unru9ne ho0p -4cd)8 vyvcompressed spring with a spring constant ouv)4nd9c yv0 p8-hore 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 o3ua uu68pa h3xnlt ,e5wbk, 42 gnq9shf spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the ut 8q2 xbup,6n5u4ngaah9ehk ws3u ,l3nstretched 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 constant of 15 N/m is initially compressed 9hefgp)e4-h j by 3.0 cm. How much work is required tj)-g h9ehe f4po compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is the 6in itmn8 r6hc ap+p9)spe tii an h6)6pcmp+98nred of the slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the to44ndvbidg 7*np of a hill with an initial speed of 4.0 m/s.4bd nnvig7d*4 Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a fr:s . zv.skser.j*3fe pictionless inclined plane. At the bottom, it has a speed of 9.80 m/.ez f:s3ssrv j.pek.*s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, cq q ,hc8- zy.-plwc1aits potential energy exactly equals its1q cla-.ph8cq wz,yc- 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, blastsikp5mm3xsmp8e/jaz dkhkm n+ -+6qk0 s 0l,9k straight up from ground level with a kinetic energk+0s0 hxkk9+-na lppkd56sjkqmi/ze,m 3mm8 y of 40 J. At the exact top 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 energy of jobg7 m ,t*qt.220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its lauqj*7tgtb, m.o nch 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 ab5a*5q iwr7 f(a+eotugdw5 ne *ove the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of th5dfar5euaoe(q+w *gw i*t 5n 7e 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 of7k v mer;o rbgb:j02t. 5.0 m/s 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 coas m2b bjg;r. k0rte7o:vter 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 *g g+o:gc/fxtl3+ gr 1-jmv qlpoint 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the d: *v+gol fcg /+j13mq lrtgx-gip?

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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 spejh5oth-+xjk 2 ed 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 k ,)-bpl 4etqrand released from rest. What will be its speed at the bott 4p,ltqrkb)- eom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal sp;q oxx02gvp 8y5qm 3b3txqz6b ring with spring constbx82qvqpm3o3byg50x x qz; t6 ant 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 22gumj8(apg *cw)a j,/t m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction fg, w)*t gc /japm(ja8uorce 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 horizonb(+uew+d6f day )0kzp tal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance wi+upfywdd e6 b z+(k0)all 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:9 9da vh64lrq-cm3q asa.:yedsp 1wt. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far willdr aqv ma:ytls9ewq a631d9pc.s :4-h 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 surfapj4jgmh bvnus2 7qluk78gsl o6 (k97 3ce. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is mvg9 (k 8247uulo6s 7qp3kn7jshm jblgoved 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 of a 50-m high slope. If the worsu*fc: o2 et hb/ev(:sk done by frict2(eeob/ :vh*sctu sf :ion is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m lob r w8a4f8y;kcng 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 ry 8wk;a8cb 4fforce 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 topv(xzntij61n1i ff8ymrh-we n, * 67pv of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along(x6ew8fr*n-zn iyt1p7 1 hnmvjfiv 6, 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 strio g vwh+xe+,*un7q p h/g,h)vykes the ground with a velocity h ,p yq+vh/)ogugvh+n,x7w e* of 7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a c bk 5g 0ti*bf rvof3wj1)w.-jflight of stairs 10.0-m highb wcj fw0)gv5j-fr.1ktibo *3, 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 m-d9 yq1cxbp2ota 4 2tlove an object with a constant velocity of 5.0 m/s. W14ctlb d pqxto9 ya2-2hat 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 e*k j ov07rp: rbdm))lknergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hpdl 7rkjokmv0 *)):b pr = 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How much force do-p 33 cf v dz3u86ztjn6pdlkz4es her foot push with when she is traveling a3kjc-4p8z 3lf t6pdu3nz 6vdzt 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. v 9+uqcnfij/8b6+ vbxWhat is the average power delivered by the engine? (1 n+ v 6i qf8buj9bcv+/xhp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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