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

1#

What is the correct unit of work expressed j6p4fsl tyl:h0(iz(p a) wlw8in 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 mo ac.7 aa4hge+t ch88yxtion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall,whjp+l1r2*n q )ul 5qp the amount of work you w1) uqq*ph5 nllj2pr+ do

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 bein/8 desf jwy o5.+kmqn- 70uctey3lt/ng held there. How much work is being8tmk.t3l +/7w0n/qfyce 5noy edsu-j 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 carr2ozan :h bl9wb*h ordkf 8;0z0ying a 10-N object, the amrflhz 2nw8obkdo 0z ;0b :*ah9ount 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 isjidql3xd8 an 4.8z fao5jv17x lifted vertically 3.0 m then returned to its original position.xl5f8q.odx3daa8i n j jz1v47 If the total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal 2v.gxwo6 yws:ff 1:qz force acting 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 the work done by gravitt-fd8t/ aj8 zy2k wj1 b2a-qzsy while the ball goes up withw bj2da8/tsa z-q y f-kjt1z82 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 ve4hka xqfhxx:0 o/01bq rsus position (F vs. x) graph, representso0:hkq1hq x/ 4xfaxb 0

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 veuotv t+oi u 49c8)xz8drsus position (F vs. x), what represents the work done by the force +vd8tio 9z4uo8)xt u cF?

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 obj i4bklixpus1i-v 3x9;ect 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 object96 vjrxd/ ,nr imh4g+q is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then ;wdl-k are )z6the 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 dtador)g +w z b3p5f-*/zmu4da car, and is moving at twice the speed of the car. Which statement is true about the truckd 4zd3up/m5)r+-fgd zaow*t b'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, an71 tvq07eutc2v(7dw lp)b xigp4: m9.b rnt aud car J has half the mass of car K. The kinetic energy of car J, compared to car uex )l7r da v7i m9b1gt2p:.bq ptu0v(w n7t4cK 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-rjvxbh n ( :7wquz45u its original speed. What is the ratio of x(7h4 u -bu:vrjzqn5w the final 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 pebblej ) f)daa)9o+a ( r0dk7trxmq0bav s;v is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to th;a9 0axqvr7mb +kad)adf (o))r v0sjte 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 movi5rrm94ob: y czng with speed 4.0 m/s. Both objects encounter the same constant braking force, and a 59 4rorm:cyzbre brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain di /u thl* d.nx./1m(,rtlzlfj vstance on a straight, level road. If you had been traverm ,lf(/.*dt.1 h vt/zjnlxul ling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical sppn0wft*w )fam e( -has81o :orbit. Neglecting any friction effects, what happens to t ashs)8*0-f w pemawp:on(1tfhe 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-energe9n/6ha62( rg k 9 ta(xwekqlode 1ua5y principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to havmr+d sh41 um .o0,zzxbps f/-me 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 4q jdih*fkbm 5)dm 85drest a height h above the ground. A second object with four times the mass of the first if released from the same heigh *kmhidmd8f5q) b 5j4dt. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 c )r ebhu066c42ajpv.jtqjp 6gm. If anothejb .6)6e06r p42 putqjj hcgavr 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systemb1 v*7 sbmqtfhet .y-0

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 entrcugkop: qrz g*m .aqx7(-/ 3g-zi1hergy K, to its potential energy U.hi- c.3- agpq tog xg7k:1mz*z/qur(r

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 driviys t/g6m2x75q/ (q,x+cv*il yut jfdjng 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 slidi+m az 4g*hn5bh z)kr3hng with equal speeds along a level frictionless surface. They botbz3gn4) hh rma*hz+k5h 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 ydq+ c+r: n x79ck1nj/z7b nwb$m_{1}$ 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 lds* dfqb -z lg.lh443conservative forces. 4 3qslbl.-4ghzfld* d

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 (air friction i -n) 2h0uhdrqus presenn- qudh2r)u0h t), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 2.wh/z scz cq,J of kinetic energy. Do not ignore air resistance. How much gravitatioqz 2,s.hcc wz/nal potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potential energy. Doyb2:r;d1iyi w not id;yy1w b:i 2irgnore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation oflol 28-f wqer3 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 jiup41)*cp5nfob ghs6rch* -

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 r1 x)eq3lf0no expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of pow. cx*s 4g8hrru9nhce3er?

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 tyo9:v;;t 3mwy+vd/ qjjqi8c qime. To do so, your power output mu oqiy/qv8v9jqw3;mjcdt y;: +st have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant accga a 2t79f9 q)y1opybgeleration, 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 and6wkigu7nkr +h o 35l6d held there. If the object weighs 90 N, how much work was done in lio56gih n7w r 6dl3kuk+fting 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 constgbp0r- q09ors pnzc *x 2sj(b;ant velocity of 0.50 m/s. What is the work done by the weight of thejnqcrx s*pbrpzb00gs -( 2;o9 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 consjnaq97b2na b* tant force of 5500 N for a distance of 50.0 m.2bj 9n 7ab*naq What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a cq/no;3iy.pap sma*-s onstant force of 5500 N for a distance of 50.0 m. What is the work dq a3yip.poa /ss; -n*mone 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 of 5500 N fo;2auo-;.krwj sh5 f 4lmjt(a gr a distance of 50.0 r(-f2mtgj5lsj.ua;okwh4 a ; m. What is 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 avfb acjip,si,(1it3.long a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclinip lz*p70d; dled 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 , ruzlb36+:+bao dfthyg4wi3x r97ii icy surface (assume no friction), with a force of 60.0 N9iyw 6rrg +io+u3,tx fbb z3d 4a:7lih 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.ahsk 5q ;na0yca76 3/9 rregxw The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when t9/se qhwx5 ng7a ka3r0yc6r;a he 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 direct)yici (,n gd5aion of the force. The graph in Fig. 6-1 shows th gdnac 5i(i),ye force versus 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: ge+2ofh,x joiw56- v(vlwe d graph in Fig. 6-1 shows the force versus the object's position. Find the work d -xwed:jfe( g viw6v 2oh,5lo+one 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. p s4q(4ma)p,0kzt+ul,uk s ps 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0pka,p s4mutp+ 4q)ls,z(suk0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at rest) faa k-i*u gqu)s; s .5zj9z1/ 2drqtifacross a 10 m level surface. What is the .5a;/z z *us tf-qidiajrq29 1 fkug)sfinal 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 2ah-ovts5z)t0q - uo9h2brm h8 00 N is applied to move a 55-kg cart (initially at rest) across a 10 m mshttuhoo) z b290- 5rh-8q valevel surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a s ::a;pd:i+fscv xc d.bpeed of 5.0 m/s. How much work is required to stop the mas+df.i c:b: cp ds:;vaxs?

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 st nac .s+z g t-q;hspi,d9hc;7top a car initially moving at 25 m/s, what distance is required to stop a car mogdpzicq+t, ;n.hsh; tc-s 97aving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a f.cbl3q hy( 4t pzs:lan*czd 46orce of 20 N over a distance of 5.0 cm. With what cdb3az cz ls 4y(l4qp t:.h6*nspeed 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 ihn0/ y9mi e3;fpkk. aand 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 alon/.0ih9;aik empynk f 3g 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 horizontaw-i)0 ihs(fio lly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the averaifh )woi-( s0ige 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 4k)eydknx-*pvk-+t p from a height of 7.00 m above a floor to a height of 13.0 m above thek-4y kpk)dvxp* te-+n floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane.x53nod,gy2v(r22lf f o1 t eaw)0y lss The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done byotfv20g3r x 2ea)52wy,ld ols(sf y1n the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm.tmhbr*hx7 q,f 1wq2a* What is the spring consta2 mq w* 7fxhrtah*q1b,nt?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How d+q(ikgyp f7yr20;(1zmjei hmuch potential energy does it storph ;kyzq i12r j0(+fdym gie7(e, 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 spring withnk/ i j3(s1yvh a spring conv 1yn(hjis3/ kstant of 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 h(ub ,q)d)l.en tnhuq)v , am7of spring constant 40 N/m from x = 0.2 )lvb )n t(qamnqu ,he7,h.ud)0 m to 0.25 m? (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 v j;kyj1uv6b 20nyx. ainitially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cmkvujx;2a1bny .y0 6vj?

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 of5 p+(k ;y4zbyd 61ur*bkg6tgsnz2 beu a 50-m high slope. What is the speed of zbn6 ur (gk41g ;yyb u6dz5kep2s*+tbthe skier on reaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial sp963fzignvma9b iuw8e t/ ;4yneed of 4.0 m/s. Neglecting friction, how fast will she be movinb9gi3/ea 4mz i;n9n6 f tuyv8wg 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 frictionless incline9di0reomq9f , d plane. At the bottom, it has a speed of9,ormi0ef9q d 9.80 m/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 fl 6vbt 5,zt;7 czzdhu/woor. When it is 0.70 m above the floor, its potentiav;c5hz/w7 b ,z ztt6udl energy 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 um1udtzip4;+tb l- urv.e ev.046vn srp from ground level with a kinetic energy of 40 J. At theutn4r1 6v4b+.lrtvie d z;vp esu.-0m 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 mp+6)61 ouz yjhah97t,t.6yf fybcfz a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height. b,y jf6+ to f)p6hfh7 uz6ayc1t9ymz, 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 oxb3. mi*c68qz31b7p vzoz 7m4so xwpat 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 next * 186wz4m zoz.bp7o3cqo3 pxbxi7mvsslope, 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 (u2z6d2/ hzke 9axwniwith a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See 2 n 2ik/hxezwda 69(uzFig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the boqv ,4-l.jgjm)gb5*vkql,dx-k 9v ex bj yp1q/ttom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastey xk q,9bv.jlqjq4k 5l g j)v*x,1p -vegbm/-dr 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 bot cydt1r362vju g-q(doq0 pu;ftom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 gd h503+lm9got xb 3g vp3auo7cm is pulled 0.23 m away from the vertical axis and released from rest. What will be its speed at the bottom of its swiv 5 bmg93g3h+opu0aotl g3d7x ng?

A. 0.3144 m/s

B. 0.838 m/s

C. 1.258 m/s

D. 1.048 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially unco b sp9wht m3hmw nh;0xs,g3b79mpressed horizontal spring with spring coh pmts7bwbh9n 9m,h 3 3wxs0g;nstant 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 k 2rhcjw(45 -4gqxregkg car to stop for a red light. What work is done by the friction forcrk4eq hwxj4 2-(r5cg ge 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 horiz x .60+a:+gvr wkzkhsxontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide befoka:+ .xxws6z+v 0kgh rre 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 sur15 t lgo.0om;gkul8s uface. It has 24 J of kinetic energy. The fri0m5kt1o; gllus.o 8ugction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surf0 +5 dthrke3ur; idm3race. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the chang3mr;+hk u r 0e3i5tddre 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 fr 34i:b twb.4(qb1j8ez qhgbdc om the top of a 50-m high slope. If the work donebbei wz14q(t 843j.g: cqbhdb by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. Th hvr8yyqa;0z 8z64ppt6gtr ebq6fxbtc v1** 3 e plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. bft p6*tz4 83 q;h gcav1bzey0t xqry6v6p8r* 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 at7znsbw(r8 / m d1.7jdld9 sodf the top of a plane inclined at 20e above horizontal. The coe jdrdo7dmf7/l1 bss 8n(z .9dwfficient 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 droppe;obb8wdn+ s xdlp2*5h ocs,m 8d from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictionl5;h+ d,x co2 bd*ps8mosnw8b 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 flight of st0za4 s9ucowx-/ j mb0qairs 10.0-m h0w 9a0mubjo/x-s z qc4igh, 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 velocity of y) d1tyt:iilm43g 7 ne5.0 m/s. What pow ynid:4gi3y tem)t7 l1er 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 energy are used by a 1.0 hp xl4oke8tlmv k;),j +amotor that runs for 1.0 hr? (1 hp = 746 W)xv;l ,k)ka 8 +4ltojme

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 50f -toi6qdb-xqv80o ( u0 W while riding. How much force does her fq6( 8i-odvx qb-ufto0oot push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 ek*4 in6pff 3 dm,lyrt ,61woito 25 m/s in 7.0 s. What is the average power delivdt4o, li66 fwf,3yipen mk*1 rered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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