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

1#

What is the correct unit of work expresse9 9vzvf kzcz1v/v 7lf/d in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a systemgv8zo..0mfsnv u2 cn 4 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 dnq;iy,a ia78b3)rywwall, the amount of work you dwyi)ra 73d8 q, aibn;yo

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. How6daeyv2zebe 2/ 00 4g+grjuu g much work is being don6gaz00yg2erjud ve/ubg4e2 + e in 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 horizonyip+uv3)i ue6tally forward at a constant velocity carrying a 10-N object, the amount of work yo)u vpuii36 +yeu 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 returned to its original p6.uu+zvx-ssv fv4(oy osition. If the total weight vo .szv6s(v uu+x y4f-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 acti10y n:c5w*i 3s kjsbi4wd-az9gq9o qpng on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of t9sn qk*l3g.uzp/g bv8om u0-h he work done by gravity while the ball goes up with the sign of the work done by gravity w0gms 8zlpg.hq /ou*9v -b 3knuhile 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 ;q+ojh9sfn* rvs. x) graph, represents*9 nrsjof;q+ h

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), tgy)xde0m, lm+;0 ho awhat represents the work done by th ;x)e+mhtd ,0al gm0oye 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 on8r20:sheet w4 qls6fa am( +ji an object is positive, 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 +:sc-uiscvesw7pf2 3 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 o(hg(hfcv 43h/ ,qruiibject'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 isvep ixd.i(*v /7z qop7 moving at twice the speed of the car. Which statement is true about the 7ipovxzev(d./7qip* 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 vbl (f5+dx: .sm8ob ,wl4zbbu K, and car J has half the mass of car K. The kiwbv+4bfz.ms5b: o 8 dl(u,lbxnetic 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 h+; oz9ehbnv+ ff8bc*u 3v-cz kgr*i 3lalf of its original speed. What is the ratio of the final kinetic energy to the initial fr3 3cv-+;vok+*nlzcb u 9hb* g8eizfkinetic 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 aj cjme2) umx-+ speed of 3 m/s and 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 massjx ce-u m)+jm2 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 is mads;u:nraba *t;c b+4oving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stb:u;r;a 4 ab +andsc*topping?

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 67gswsp,*gt n)b aed;your car in a panic, and skid a certain distance on a s ba;,d g)ep*gtws7 n6straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sm 1(wd pbl k3xswufaya55):t3un in an elliptical orbit. Neglecting any friction effects, wha3k yba fw( xl)pwa513 m5:dutst happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle(3b;mlqw k p2si ;+pgaz67l bz.

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 energy*2j7vf w 8h3pd3l5zb,i ytz cg?

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 s4y mabhwphq)15f /k 8zecond object with four times the mass of the first if released from the same height. The potential energy of the s4)fwha pq 1ky8hmzb5 /econd 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 avm1s3r) rf0:ik1y2 apwd)ldend of a spring causes it to stretch 5.0 cm. If another 0.a:ya10m l2fd)kdr3 irsw)v1p 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 energy ob;52.alhh20u*; jn+smwf5v jh jmtepf 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 :ceores o3i+hwg*a4d.9 r p9x energy94.s* e+i9hwer rcp oadx3og: 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 driving up a hi n*ajz,(rizgig5;h (e ztm9oez7j. 0hll.

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 arg2c;rau7szb) e sliding with equal speeds along a level frictionless surface. Theuarg2; 7cbsz)y 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 m1 kb ss/kklr 2d,j/ /p:jo*gd$m_{1}$ 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 enersp e7pn;m g:mhwj81m8gy for conservative forces.jmn;m8 7sgm8:e1 wpph

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 (c kz:iar/c4z. ;6aa b hg:r2bpair friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at :rrcb2;4hkac :gpa.6 z/zbia 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 gaiqrq89 zn u:uui sls/56ns 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ssqu5q r6i:9n8l /uzu 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 loscshrcvum8*jio- o+;q:yf 3 a/es 30 J of gravitational potential energy. Do not ignore air resistance. How muchsfco/ vjmoi +*;ryhcuq38: a- 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 con-j n8n*3e xso53hdw feservation 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:6 7talxbtit-

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 exofz*6wd w jr8.. jxr;bpressed 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 novt* )t gfmq30dt a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times tao 7k3:.yldrj d(ap*ahe work in one-third the time. To do so, your powe*a r ldao(.k pyd37:ajr output 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 z1g.m2pz 1.adtxd:p q 5kb4 k-tub/a fconstant 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 vertica tqfgnk x37 pqp49-qbtsfs;wc)-+( eqlly 2.0 m and held there. If the object weighs 90 N, how much work was done in lifc4s-q7+ qf(;-pxtb pqg )e 9w3ntskqfting 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 )a2op*p9xi+cfs up7w constant velocity of 0.50 m/s. What is the work don7* 2c9wp)xpoa u+sp fie 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 pulz yn7s qh/5k69f0ll:lh irw.lled upward with a constant force of 5500 N for a distance of 50.0 m. What isk5hihyrl 0l/:9zlq l 6.fws7n 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 ekwojckvzz91u b0a r51) wodu )co /:*N for a distance of 50.0 m. What is the work 5jzu1 ocb1vad*e/o9c)k:o 0zukr)wwdone by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward witrh;vprf5,guj2+ pz y f5mk0or 7ao3k;h a constant force of 5500 N for a distance of 50.0 m. What is the net work done on t oj0mhgrr+yk k; 5,vf5 2ro 3zu;7fpaphe 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 o-bpryo+b) k 2along 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 fruitl:a:f aer8 fq2bh fq 5,48apkw slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fr35lkzaz ,qfy-pv 4mz ; 3gu:sliction), with a force of 60.0 N at an anglll453qa3 kzfmy-zu :p;g s, vze 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 in Fig. 6-1zpl i-/rpon4 t1 deh-j(l8a*n shows the force versus the object's posit8lp -zh oid- jlta/*1r(n4penion. 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 graph inpf4s (/p *exrn Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from (ep/r*fxsnp4 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. 6tz8tbv -m.:mb2fc:tg -1 shows the force versus the object's position.-2tzm :bb:tt mf vgc.8 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. The graph in Fig. 6gk1ujeo( z5-1em rl0p - npqr0-1 shows the force versus the object's pg0rpz ue l -j15n(r 10eomk-qposition. 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 0)7h 7 inazcxcjju69vN is applied to move a 55-kg cart (initially at rest) acj0azuv h 9c677ic)xj nross a 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is i,bw 74gsm:m sl.c7k vapplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is :kvs7,cmbs 4g 7.lwimthe 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 a speed of 5.0 m/s. How much wor++ khar:mdj )so0 -1coiqw8lk k is required to stop the mar:k-1 ol sd) hmwokciqja++08ss?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is jky-rtdyrq;s 4;esm4p*3k0 h;b rrd 2 required to stop a c* me p ;-;hdqy3y4dt s2r;kbjr4r0 krsar 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 cf,zagjz gbbfomn/2 0l r(+8s0ocked by exerting a force ofrg,f8l bzfog j s00z+nb(a2 /m 20 N 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 c. mqkn( 0c-4*sl;lgldrlyxm bs. -z-iomponent of 80 N and a vertical component of 60 N. 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 -4bd c--limg ;nq*llr kl. zsmx(.ys0is 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 the ha+f64 rzks wu f 1b9tbuwa8p(r7y with a velocity of 60 m/s. It penetrates a depth of 20 cm b9 s+k6bawtur rw8 (4ff1pbz7uefore 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 fr5 hmg.wzwt, g,hf8w1rom a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentim ghh 8r.1fwzwg,5wt,al 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 ,+ vx.kc f)s9qfqy n(klong and rises 2.0 m. Iff(9nv.ysfk,qc k +x)q the plane is 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 springple pwk;/nm*f5p 1+it to stretch 2.0 cm. What is the p p*l;+w k1ef5tn i/mpspring 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 bt8: ds0c 9khwvy a spring constant of 60 N/m. How much potential energy does it store, when c0 v9whst d8k:stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially unco (zap q1bsj v)n--o3simpressed spring with a spring constant of 25 N/m 31-zvn- bq(os psaji)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 s t:.v )ewletv)0:zc.apnl x/e pring constant 40 N/m from x = 0.20 m to 0.25 e.v /:vntpl.)el)c: 0 w zetaxm? (Assume the 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 constant of 15 N/m is initially compressed by 3.01(e a3c4ys/ gza 67anqz2otlc j 4:hgh cm. How much work is required to compress the spring an additionalo3j6e4c/l sn1(2ah zc47:ahqat y gzg 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 t 1iab 8wvha ;n2a,q0stop of a 50-m high slope. What is the speed of the slier on reaching theaaw;0,1t qv8i hnsb2a bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed76c+vpa: ls zv of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 ls pvc:a +v76zm 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 incli c3ll. /py4uzpned plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height 43yz/pu c l.lpof 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 0.70urt.sc,j*vkofz+ 6tcm; b ;poa9w/i1 m above the floor, its potential energ;/,focu; t t1wbz mi*v. sk6a rc9pjo+y 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 letxbo;m) eh ln9xb:k9/vel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what ve)k;x/ n htb9:lbemx 9ortical 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 kineticb yz4cue(k :7b3nxtn, energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pointn (e,4ubc73t: xnzbky, 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 fromemrj)6q;hm0d2 .cu w g rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the 6ce m;jwru)h0q2.md gnext 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 abovx4 0fuilad-utm- +c br d9(dv/e the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m - xrfv-bc4it9 (ddd0a /+umulabove 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 bottom0)q31jk dit (rcdx.at 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,) d1.i 3xtd(ka ct0qjr 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 bottom of its swing ((yr46sbyi99 icw 0jxgp8k5 nxpoint

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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 :cmuj:p)i dkqfr 80t.from the vertical axis and released from rest. What will be its speed at the:.kqu j:0mcfr t8 idp) bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving r qaaas y,kxm3.e) 3c+*jk;htat 25 m/s hits an initially uncompressed horizontal spring with spring co3;hqra .kes m*y,3+cx )tkaa jnstant 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-b 2c .ogcmd h 9s7;j)szv;uqw,q,e tz 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by thjo 7ctus.czze ;gqs-vwb2; md )9,,hqe 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 obd yetu-u84wq-wq mm.sq.fro zg0 30h-ject and a horizontal surface is 50.0 N. If the initial spey.-se qqg3fzt8rd 0u -4omm.q -h uw0wed 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 on a rough, level surface. It has 24 J of kinetic o.t e, kz/oodi26wl- nenergy. The friction force on it is a constant 0.50 N. How far will i 6otw,ed2kno /l-.ozit 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 appliq,gs67y8,ve j3c pwhaed horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic frg3 ewv,s y6hjq8 acp,7iction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its 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- qgkmfgx3w4,0gj vqk5q4yw;. If the work done by fricgk45v0gg3qfq ;q-yx,4mkjww tion 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: ovi 6y;7 ef-sya:lge. 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 plyaese7 vgo :6f-lyi:; ane. 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 fro: tsgi cx.2/z7gkrvn3 m rest at the top of a plane inclined at 20e above horizontal. The c . 2gn sxgv:kz3t/i7croefficient 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 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 fromz)yo5ln6q0 - -tk jl+gm9p4 pxumu e:q a height of 10.0 m, and strikes the ground with a velocity of 7.0nlxqp mu4 - l 5o0u 9)-:jpktg6qe+myz0 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 usingwy38 r+bkl :hdyl 09qj energy when he runs up a flight of stairs 10.0-m hiyk 3r:8y l+0l9dwb hqjgh, 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 mov o wl (q vqpwk78oe.an+(-v)qye an object with a constant velocity of 5.0 m/s. What power must be delivere e-vqw)opyva7 wk( ql(8.qo+nd to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp m-m 4/x1mp(ha;evz bmwsfrd/. otor that runs for 1.0 hr? (1 hp = -b 1h/.m wvzm4 erp;mx/(fasd746 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 c fj+k6 dhqvw;trc24*much force does her foot push with when 4kqt2;*hw vr jc dc+f6she 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 accelerates from 0 toxes6 (z f/* fzwieho m5l30o9*vchkf; 25 m/s in 7.0 s. What is the average power delivered byw*fz 5eh/ vi mo;(lf0fx9so6c*3 kz he the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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