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

1#

What is the correct unia9v.1 xr+*alb0hr iah:k 1q gzt 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 system if there is no mye2, gmhp0lxt(ehevz ;cz06)+i gp4 uotion?

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 agains3x bk d7az v,:k(lqdfbwxp4+ 4t a stationary brick wall, the amount of work you ,zb+dbxwk3p( 4dq 4fl k7:vxado

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 be2y dqusf;*d 4king held there. How much work ;sq4*d2duy fk is being done 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 horizontally forward at a constant velocity carrying a f cc )3qads*lv;1 hr-e10-N object, the amoun; a1qe*lf )dsrhc-3 vct 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 returned to its origi;5ku xa7 hr,qonal position. If the total weightu ko;rxq7 ,a5h is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on t*c vif4jvpodgt6n q2irj/ 9 ,p**ysb +he 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. p) qmle2rs++/ u f8gpjCompare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity+p/f+p)2es8lr gq u jm 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,mm g5+ wz (k0awckn,9h on a Force versus position (F vs. x) graph, representsc+0h mww k(ka5n,9g mz

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the *kj j n(r ;26tqikgf(ework done by the2j(k (e*q rgk fi6tn;j 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 c 0(apuraf:p; : s*yct n:.oznon 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 negativea )w- dbup(h8g/tc*l 7xyz3nnzx90lp, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic en9y+t:l.on)rh: sdoxrfyxt(q4 e xk 2 4ergy

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 a1jq:1 dwr- vnnt twice the speed of the car. Which statement is tvwr1n1-d jqn: rue 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 half6i;optx1hfzm1mjvch((p)7l xh p a( 3 the mass of car K. The kinetic eniczx1p3l 1)xp pjt(h( ahof6(vmh ;7m ergy 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 i kgkv3r 9:+f 3towslj,s the ratio of the final kinetic energy to tkfs9jvgk:t3 l,+rw o3he 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 mwwc6ur+),h t smq9fyyc2 j7 o4oving at a speed of 5 m/s. If both objects have the same kinetic energy, what co c7jmw)uryw,t+ fsy 9q h462is 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 moviy zh62ncs9ku; vwd*8kng with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Bw26zu n *;v k89ydshkcoth objects encounter 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 brakes of your car in a panic, and sk/1 bmdhw4kd-ps -h09fu2i jshid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same con sh4hj p2fskud9d-1m b0ih/w-ditions?

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 ellipticalxd b e-coogl s;d,6+/l;, hpjs orbit. Neglecting any friction effects, what happens to the planet's kineti ,dg;;slo6h-jl+b/osd cp e ,xc 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.b z*ws x36t)pr

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 syste5w75ldo*n7nvwe qr 60fw0omkm to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from r ;v z7eti6 d-iitsx6z6est a height h above the ground. A second object with four times the mass of the first if released from the samst -i6eivz7xd;t6i 6ze height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causeq--0h1mj1/ub epgv wjs it to stretch 5.0 cm. If another 0.200-kg mass ishm 1g wp-j q0b1-jevu/ 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 ofjy48mfb d v6* vph8hz, 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 potentialxu/ 0qlapg)-b d(ne*7kci1-l,orz bl energyo*npdrluc (lq-aib) bz-e/ gk1 7l,x0 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 drivingmt, m7fvc/*kz up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speeds ayn*ha9fu x 8g0ddz2 )af s)d+blong a level frictionless surface. They both slide up the same frictionless dzd y+hg80ud2af *fx))asn b9 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 n8)tj kb9q s- vca6g50r /+f w5ewttkr$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for coni 0zq4dfh2by 7servative forces.d0i ybf4z hq72

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 i03s98, xvykti3hg intop of a building, 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 vi8 k33siy9ng0 ih, txenergy (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 ignory.ka70mjmc/sy r0;8s * y; a9tgksk kte air resistance. How much gravitational potential energygk;8a;/0tsy kcym*kj kmrsy0. 9sat7 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 g9zgd zr*j,87 z8u(1cr i xprsmravitational potential energy. Do not ignore air resistance. How much ksgz,zurd7xm8i(9cz r1 j* 8rpinetic 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 conservadgp 3m5xh- ir8 vft/,otion 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 isba -0epv f.tk6

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 inmf6ui.9dvli. 1 6 ut w)t(ghme 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 noc4h: dcryfvxr(o,+ 5tm 49xozt 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 the work in one-third the t zbvo l98ypgd3 :,l1vm7 e2zxuime. To do so, your power out:yzeovlb x218zvdgu 3 l9p, 7mput 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 a l t jdvb7ldvqg( w20t6h.1n9kt a constant 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. If the ojtmz(*w(t g)66 zz szdbject weighs 90 N, how much work was dozjdm(zt6tz z *6)g (swne in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance ob r,k*,txkjn0c9 0x om 99njmcf 1.0 m, at a constant velocity of 0.50 mmxcjk0bjc0mt 9,nx 9,n9ok *r/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N fo+-n 3-audqtl yr a distance+ydq-unl-a 3t 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 is1;uebei/tu y j5l54x dup.p g,/ rj2lz pulled upward with a constant force of 5500 N for a distance of 50yxu up bju,l /i1;/4edlrpz5t2ejg .5.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force -7tda)bdkfo90 ,igog1y5vm g of 5500 N for a distance of 50.0 m. What is gob1mg7f ,v59adigo)dt0-ky the net 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 along a fmi0)d/ ux9wf $37^{\circ}$ 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 a8q1dx cv)ce (a 9kvl06mkbj( x 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 si y) f f9lgpde7a;p4t /8e4ezkh.e1ycxster Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 Ngpekc 74 zlfy htf e8y;.dp9xe/e)41a at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grarw1 cohi4i75gje ;sx qa2 ce 2,r)2nybph in Fig. 6-1 shows 27cne5oj2g) ii 4 ;b, x cysrw1rhq2eathe force versus the 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 to,l*6yjpsjju+ ) )2jldph)q the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find l)tqj u,pohp)jy*j +ds6l2)j 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 directi0lqnvlw-m m13 on of the force. The graph in Fig. 6-1 shows the fmv mw3n0-lq1lorce versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fi49 hmze8831c iqtqb vvg. 6-1 shows the force versus the object's position. Find the work vm t818ib9qh34cz qvedone 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 app1yhprn v o4j/-lied to move a 55-kg cart (initially at rest) across a 10 m level surpn14/yrovh - jface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart m(rdu1)9n h39meenl lb0wjzc;3xpv- (initially at rest) across a 10 m level s-pe0zxl;h l)w mm3ej9139c rn dn buv(urface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much workr1k ume m 2q m((oe5qp.qjxg(9 is required to stop the m(5.2(up(ej m1rqo9mkgm xqeq ass?

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 ind1(),qpp vu9wnwma r-c;deu(itially moving at 25 m/s, what distance is requureqdw mv1;)d,nc(p a- (u9wp ired to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by ex5, dzc7ugi/dverting a force of 20 N over a zd/c,v 5d7iu gdistance 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 hv1( hmlxi9 q+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, m 9+ xqhh1(viland 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, strikingp:9+q 3g+y f 9caz ry;zkpv*bt the hay with a velocity of 60 m/s. ;c v9g9 y+rq3 * +fpzkz:ptbayIt penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to hll* kl848 ma75 uuydxa height of 13.0 m above the floor. What is the change in gralm7xuy 8hkl4 d*u85 lavitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long.)ikcy e2 if41nh7i fx and rises 2.0 m. If the plane is frictionless, how much work was done b7n)i1f cky.42i fix hey 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, caus0kqdfdr qpy.mfr8-7gr o10olwh67 g ,es the spring to stretch 2.0 cm. What is the -,0fdfk08wq 7py1 o6 g rom7r. dglqrhspring 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 sprin -15nkk:a ehte*;dtd 5 tvoqp7g constant of 60 N/m. How much potential energy does ita1*o-v kq 5eh5e tpk7;dtdn:t store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed seu,*wgp-0yy+g y b1jxvq9 o2d pring with a spring constant of 2 obj0d1g*9q+pxw2 v -, egyyyu5 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 constz flw;f aob.+modoi gs*,1s7*ant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstre woi+s* gbmd. ,*;7ao1os lffztched 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 3.0 cmg+k-ehza6y( 8 efpr+n. How much work is required to+8rpa-n zeg fke(6yh+ 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 higxjb/.gf3wg/z( j53iix1uy mg h slope. What is the speed of the slier onggi m(33/z1wy/xgj bx f5jui. 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 top of a hill; 2afsf 6sz6a:eqc x3h with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatif2e czs6: 6;sq3a xahfon?

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 in *v7)x8pv 2igv eftv38luyo)s clined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical euy8v8*oi)sp7 x)v f vtl2gv 3height 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 j3;3v03h tvnl(uewqait is 0.70 m above the floor, its potential ejq 303te3a(wl vuh;n vnergy 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 fromnnw) h,fxn:lld- u-t. ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mecu d.-:n,wln fx hnt)l-hanical 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 22vj/:-jlluf63 he991zkgeg f5 o phs5w0 J. At the highest point in its trajectory, its kin: k593wff/j96sezj-o5gpu v lhe 1lg hetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m0uu3iuj c (l5e above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coasterju 05ciu3u l(e at the top of the next slope, which is 30 m above the bottom of the dip?

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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 abork 1sx6 a46gbbve 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, whichb4xg6 ras6kb1 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 abov mj2 )dvk1wps4g8 (wszgsm)rc 5 l+*kre the bottom of a dip with a speed of 25 m/s (See Fig. 6-5 8)m4g scg+wszkldr(pk *1jmvr)2w s2). 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 bottom of ij6 o9.9h5oiee(+tmbp8dpd m jss*2dcts 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 ver+x7)hv uio4jh b jct2,tical axis and released from rest. What will be i h+u 47jv)hj2cx,otb its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits aapg68c5 tpfu*x nl2zb 2lj+xys )9l(pn initially uncompressed horizontal spring with spring*2 8lpl (g f x5syzapjlc+bpnx6t)9u 2 constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red ligh)aww7k; g *oh s1-d(jbfg,j:zy- ezuyt. What work is donej ez;-a,7uy(zw gdb*-w o h)j:1sfkgy by the friction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surface 75o/7 ceet-fbayo)gzis 50.0 N. If the initial speed of the object is 25.0 m/s, wo 77fo zba5/)gece- tyhat 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 rouczc8 5c,8ejexd 6g8 zigh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide? ,jzee6 c8iczx5c88 gd

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. xo0l,q,- ekcz The coefficient of kinetic friction between tkqcez0-l ,xo ,he 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 thuya5glw+zvy z6-6c-n e top of a 50-m high slope. If the work done b6 ya5yc-6lwz un -gv+zy friction 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 planel56nxa:mksulitatxf / z/+4(wd 3xf xo f67;k is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the boxio/xwk6lf (+5tsuzd: xtm/7 ;6xf kx3n a 4laf to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of azc x* n:y8hf+p plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass an*y:z c8xhf +pnd the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height qi ;.d1gpd.)) cthan+bl6 m umof 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Whatqp.m m6)tug1a;d hncbdi.+)l 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+xt f1cyp 9pbv e1x 2e.6vs-yg runs up a flight of stairs 10. gest-2 ex 6p+.b1 fyvyxc1v9p0-m 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 object with a constant vlqy)b-bkae2 nsjgf *x8l,)(o u*zs5belocity of 5.0 m/s. What power must be delivered to the object by the forbxs8,j*( * baglqofzn))kb52u -ylesce?

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 1nw y6rughz49-+lu deyev(t s6)o m,v9; nf ndare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 7,zlh1 duo+ )69yvneevdsfn9t; 6 - wu4r(myng 46 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 r/sbkhov 925 ;ruv e4ebiding. How much force does her foot push with when she is traveling at 8.0 9vvkhes /ur 5o; 4be2bm/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+z0):jk bu7jacf* 5lfknl z t0o0m1qp /s in 7.0 s. What is the average power delivered fajl jlm15q7u0zt k*bofp+00 ck:)z nby the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95