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

1#

What is the correct unit of work expressed in e1 sxmrr:r- 9pSI 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 tf l:px*4t8ezsystem 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 statiovfab 9;sfm99 enary brick wall, the amount of work you a99bf 9mf;ve sdo

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. Hop0h t+.9.wd: qp gteutw much work is being done inqw:t9h d +t0..pge put 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 avxf+rh+0 r /n 4wvxt ce7c/vu8s 29lar constant velocity carrying a 10-N object,f/ rhv7vucrr9a8+2n 4 0s/tlxcvx+w e the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then retu 6w l ,)*cjjjwdbvaxo/c r*cl(,u1vh(rned to its original position. If the total weight is 30 N, how jxlj(h* /vcj1r,c, aouv d(l6w)c wb*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 -ccf o6;m;0ddwuueq- 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 t1* rb3yw4p(0 n,kgru xyl ;lzthe work done by gravity while the ball goes up with the sign of the work done byp1;ly rw,* yrnl4g0txu bz(k 3 gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. xnja, od2bplwjw9 vy,0b x /()f) graph, represents9 ,nlj) bb dvjf(/y xww2oap0,

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 v9, ;o1iqa- 2kjyyrqxas. x), what represents the work done by the force F?,a1rq-i2 q9x;yoaykj

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 objem *hi*coiiv m1qdwsq21rdyu +l 25but -q 5w*:ct 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 ajf9 : jzfx/+dkvk.4afn object 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 the object's*-b /zsnlzjc0/cz;0cf; ce q d kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the spz/u/e96;vfwm kv* ,sehijx) zeed of the car. Which statement is true about the tw9;xzjv) fzvuhke smi/,e*6 /ruck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass xo78:r8tw rd wdnl/klw2 6s d/ku8u r6of car K. The kinetic e8 k 8/wn7wsdd/6rt xo2dwrl lu ru:86knergy 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. u -5*/aog ivsgWhat is the ratio of the final kinetic energy g igvo/u* sa-5to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble izrsjp n m5feo/5qp,qx2 gz 3,-v25wggs moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's gpzmf/ gr2ew sjvn 553x-p oqz5,q,g2mass 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 masg9o qerj-rc8;oyo -k. s is moving with speed 4.0 m/s. Both objects encounter the same constant braking 8qokeoyg jc9-o;.r -r 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 sk1jq rguo./w25gzpxo +id a certain distance on a straight, level road. If you had been traveling twice as fast, what distan+2o5z u.pgqrwog1j x/ce 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 mass0; +dwaitk9zg:dt7w *uzb1js ; twaj) orbits the Sun in an elliptical orbit. Neglecting any friction;wb tw;z91 gwz) 0jad7:kts+uj*ad it effects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle8jrlv8e lfzg 9x0u* c:.

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 negativem* weh o4n 7l4ftd-t/cdflz7bd ud801 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 g zy*gc60+vnfest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential ener6y cg*+z nf0gvgy 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 causesk 5b*im mqkyc1v3*v emd/ /je4 it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will bej14mkmv/ b c*m5yde*e /vqik 3

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 mechanicalr go :3+ss-lat energy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its pon 8 648g/f okdi ibbo8okutkg,34ocb;tential energy 38ofib otougg6;,4in4ko8cd /8bk kbU.

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 driviiyh( +( kbmc7ang 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 ob.c.lnpvtoaiz 1lz 3+* ject are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whi z3ivn + olpc..*zta1lch 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 wh6 .(1 sqeawasbg;: m$m_{1}$ 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 ofw ha2 )rt.c )5gn9qhna conservation of mechanical energy for conservative forces. )q2.5a tacg)nr9wnh h

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 frictiohz)ufw*8jj *9eb2ll yn is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare tjzulh 2*yl*b8ew9 f) jo 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 J of kinetic energy. Do not igs 5o: zmu**aw20yblxg nore air mg*52uyaxl :*0 sowbzresistance. How much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 Jxk9 ,vf/qkxzgkx50e708n qw z of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the balwv7zq0 x 9k5 kxqe/ 0,xkfnzg8l 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 otp5hn5 /dj t*rf 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)jgeh(y ty.k: ;0wd se

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 expresse.ax u o1* qth*-xn5eaod 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 kln hr**)yksjanmdt+ln -,fqz*/ ;xcn n0x4+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 time. To do sojr1,cu* (*umqc 2ai) n baksx., your power outp i2k) *rbncc m,j* q(1suaxa.uut 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 constant acceleration, the carifoju eqxw(9(28l (-- t7n;dfrxm bqe'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 jvq rq+r2ch h 2qiao(2hq(3q5 2.0 m and held there. If the object weighs 90 N, how much work iqh2ar 52 qq+cv2ro hq(hj 3q(was done 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 attd: u z20lbmjb9- ;fd;lmuj,ir a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the bo2;b0t-bl jl ,9m muz; td:fudjok?

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 pulpo e)rb0t 72yeled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N)0ryobp7 ete 2 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 N for kr/ hzzir8h - w(ikc0ih,2kr 5a distance of 50.0 m. What is the work d /kkr2 iir05zcz,h( i-rwkh 8hone 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 withy;-e uwwt6s x(-v: qi.n4dwc6zlf: ei a constant force of 5500 N for a distance of 50.0 m. What is the net work done (uw.:xwcte f66ei 4:d ;q-vlnwz is-y 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 bop(hwt b)6i0along 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 s15il n5diy1 eclides 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*ztp+8ss: *f ydk; eid sled on an icy surface (assume no friz;+:y * *s8if peddktsction), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in jdt -evu/+w80 2lw-3beledp. oh+lsy Fig. 6-1 shows the foy/+w308bdel-s +.ho2 w pl e-juld evtrce 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 the direction of the force. The graph in Fig. /njui7r0un pil8jeu9o .i2c(6-1 shows the force versus the object's position. Find the wonir/.iu0o2nju7jeu9c (8 pi lrk 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 directiondz+:atb+*a nj of the force. The graph in Fig. 6-1 shows the force versus the objeza+ab+*d:t jn ct'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:(aus9 cjlcq q:5zi)r 6jf. 6ivn*chw in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves fro 6r.n:i5qa)zvh( :f*si wu j9j6clccqm 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move l.0z vukmd;9f a 55-kg cart (initially at rest) across a 10 m level u0k9fvdm. l;z 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 applied to move a 55-kg9+7 jp0ewigiz0tx4tssr +v ,r cart (initially at rest) across a 10 m level surface. What is the final s+eszir709t,4 +j tgx vwps0r ipeed 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 work is reic g4e8 ::g7qmd ctcm8quired to stop the ma qmt7::ge8cmdc4i 8cgss?

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, wh0jt t oa7;7k+ ;lfdld0qrox4 wat distance is required to stop a car moving at 50 m/s under the same conditionxw;70;kafot 47d0dl to lr +jq?

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 force otvxbv*f. z825 rvtyhi 82vz6ff 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming z tvi *f22 h5zbyfx86v t8.vvrthe 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 bw,vc p0+l,/; kzz/u nkqf+yo 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 f;cn fw0 lzb, zy+//kok ,u+vqprom rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally invo :r3ys 3f1g6xgkyr,r;v zbar:5f+ito 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 average stopping force acting onryr+gf;o 6 ::zxk afvisgry31, br35v 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 * ky+u,njpjoj,t qz k(r0n9;na floor to a height of 13.0 m above the floor. What is the change in gra,yn9k* (rj0 +t; ,opjj zuknqnvitational 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. The65ado)bxq9w qef1dsp6 h rx(/1zh q ,w plane is 4.0 m long and rises 2.0 m. If the plane is frictionphdhw)6 x,a zbxqrswe9qf15 q1o6(/d less, 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 spring to stretch 2.0 cm. What is mmvkrnb4;-nk4fc, ui5 54wcu th nu 4mcri,wfkbk mu4;vc4 -5n5e spring constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spjbo 06zjhf*yg f5aoy0191 tddring constant of 60 N/m. How much potential energy does it store, when stregfa1*ozy y ojj1dthb 0f96d50tched 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 in-/uzmjxxcon fu 9:06hitially uncompressed spring with a sj/uuz 9xch nxm6f:-o0pring constant 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 of spring constant 40 Ny.bhj jdirwy6) 42dv5/m from x = 0.20 m to 0.25 m? (Assume the unstrv jdbwyhdjy524.) 6ri etched 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 comp5f (7:ukkiyjihst- 9 wressed by 3.0 cm. How much work is required to compress the spri79f(st: kkw5yh j-iuing 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 fro-r toah;iyc)d k:e+u ;m the top of a 50-m high slope. What is the speed of the slier on reachinrh ;yue+a k:o- )dc;tig 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 offst,).o; 5c lfmf2pm jh the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after drophjf ms5.cf 2 ;,m)tolpping 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 inclined plane. At the bottom, it hcr7av6mgameml*- fco gw7f 4/i 2+y;was a speed of 9.80 m/s. What is the vertical height of the pl6vcm7irg m+ -flaoa ge w42c/;w *7fymane?

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 thx(( f1nvd. 37goysxt1 (ildpoe floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast xi73vp.l1x(n( sodoyf 1dg(tis 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 g56v7bsu niujc5t a;iso ri/ .5round level with a kinetic energy of 40 ./5cibj7uia ovs t5;6nr5 u siJ. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground wcqec21.1cl 0udp4zlj ith a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120zplquj04l2 .1cced1c 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 m above ima7/j ai:vbgd:5 e,bthe 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 above the botidvm :g5ji/:eb7ab,a tom 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 wi d 0g2v pt9f8ieb,deui8usx*cblv(-l p r p3*5th a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the topdx,*r v9epd(iv-e8uu t* 2l8 s3bppci 0bglf5 of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a speed m2.xyj xw9 3g )bjgwt+of 25 m/s (See Fig. 6-2). Neglect friction, what w)3w bjy w9xmtj.g+ x2gill 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 bottom5 f ply1w9(ektw6ph3 qnqh5w2 of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and rzsz6x;/b k:+xbx /vhuyrr8c;f db 0n7eleased from rest. What will be its speed at the botty /cd/k 7xx0;n v+frhzzbrx:6 bb8su ;om 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 2hwmbm4 - b3;jxuiwq4at 25 m/s hits an initially uncompressed horizontal spring with spring constant mxhqi3m - ;uj4w2b4b wof $2.0 \times 10^6 \; N/m$. 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 foleb+najbk+d,4 vj lts q6 zr.o5j*9 )yr a red light. What work is done by the friction force agaiynb59 atbl4.s6+lj ko q dzre,j*+jv )nst 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 beb23ao4ah kud tke-q c8( :c6ojtween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to aej uhqk6-c ck dto28oa(4:3ba 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, levetn-t*ernh5 0jwz 8.zmvguf3 +l surface. It has 24 J of kinetic energy. The friction forr8 .h 3+*umz5ezjg fwv0nttn -ce 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 horizontahpuu5o3w ;r: ,b9oia 3hc9tkally to a 2.0-kg mass on a level surface. The coefficient of ;:wph, to rbi5uok3 aah93cu9 kinetic friction 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 h36-sm d thua,aigh slope. If the work done by fru 6h-a tm3s,adiction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long (vow f8e: p+k lo57h:c iue+faand rises 2.0 m. It requires 3200 J of w8: pvif +h(5cou: fe+ wla7koeork to get the box 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 relek*xf b tp7fez 0lr,x5zd9e m27ased from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetif*tm x7zedpl zfrk7 5e,9bx 02c 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 from a height of 102ee* fc-0j dxbi0udnva 2i84-exp6v p.0 m, and strikes the ground with a velocity of 7.00 6e-* xv uii p8nd-0b cjv0 2dap2xe4fem/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runu7g8lpwy1aqytc 32 rlbbm 5 7,s up a flight of stairs 10.0-b2c5,b7y7r1y gp8lqwlau 3 m tm 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 cons sje6t:c)2uuhl tcz). nph4i0tant velocity of 5.0 m/s. What power must be delivered to the object by the forcesi h u.e4tuccz2t:)lpj0 6)n h?

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 ent2td ,r)bb.w97ee xl+ng-cox ergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 t +bxd2e9etc.)7rwnogl-,xb 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 whilem:h1 i 8bz i84qxn-clan8idx0 riding. How much force does her foot push with when she is traveling iln:-a48xn dzbq c 8x0mh18 iiat 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 t)n/e hsy 2l9yio 25 m/s in 7.0 s. What is the average power delivered by the engine? (1h/s)y 9lyen2 i hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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