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

1#

What is the correct unit of work expressed in b):;gtg2dsrg 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 sysweit74zaa ndh k +6;z:tem if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, b: ygq9zr0 ,5ewdn0b/ f/br uuthe amount of work you do:5 r0byfe9,b wur/u0bn qgzd/

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 thxc/ /.kr9 2o9t( tdr viu iy*7mnh2mwoere. How much work is being done in holding the boxo ur9i /x9onvkm22 ty/drcwm*t.(7i h 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 horizontallag (y j-w/,hgfy forward at a constant velocity carrying a 10-N object, the amount of work you do g fwahgj ,(y-/is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to its original pi2k n nu5do,*aosition. If the total weightuk5dna*,o i2n 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 d unv4tz928 mhqo 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 m :.-zyjn, nh8. 1qvlji1kns*zl oij*work done by gravity while the ball goes up with the sign of the work done by gravitnlv,s.k n*m8 jzn j.i:jlz1i*h1-qy o y 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 vsc lelza 5v/8(b. x) graph, represents(58bzlvlaec /

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 represent+jp td/q9w7jy hkd 5t 48lqpy0s the work done by the forced jdpy8t 90wpkl5j7+ /4q qyht F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an ob. zminz11xtx ;ject 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 isw0+,idasf r;k:* o plj l3w9fs 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 s0(yf,fi 6*bv1l)ewnud *c. jem g9idis zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as m7i25jn 7 .k*ucybfjhu ,exfje w2fa:f*vm( m/uch as a car, and is moving at twice the speed of the car. Wh2j7 ,* e.mjy7b 5hm:vif/e ucua2wxnk (jf f*fich statement is true 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 n 9iigov:y6:pt(i-3*y heb dj) ass;j fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to a6 iy:;i s 39byvspt)e(dn*:gohij- jcar 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. Whbhe:8gu0 c0hgea6jd 3at is the ratio of the final kinetic energy to the initi jc3:ghhae8du0 e g6b0al 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 co + lqz*uf/-eis moving at a speed of 5 m/s. If both objects have the same kinetic energy, what*- f+ c/lzequo is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass isw6np;gu* loi1 /qid:y1 pgnnzb;;q , x moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object tryn u big*;ig/:onw;;p,x pdz1l6q 1 qnavels 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 certaxr1y ots)opvb)97 x 72bvw) elin distance on a straight, level road. If you had been traveling twice as fast, what distance woul lp2bve)oo7t)1 yb)r x97sx vwd 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 oe cani r//tj bxjcp/9h6(t9p+ rbits the Sun in an elliptical orbit. Neglecting any friction effects, what9/ae6p t9h/ tn/xcib+rcjp j( 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-energy7twre;ktz (oi5yn*v8v*q k )c 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 have rg6jj 7ffz ;/vnegative 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 rest a height h above the ground. A second n3 dpq/0,l7(*u md 6wxhhl lgqobject with four times the mass of the first if released from the same height. The potential energy of thel ,x unqw /m 7d(l03pgl6*hqdh 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 hx/ zf3 b)uj5pbpzty97a0b-z stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential enzf-a0z35p ybx9u7)hjt zb/pb ergy 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 energ/ jz1ol5guj/znk/ /ffy 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 itsg4 bxn xi gh30vee3 es.c76q.o kinetic energy K, to its potential energy 7vxxg0b4o iehce g36nq es. .3U.

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 drivin tx t:-qv/)7ot mlup;sg 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 speezd8 ;dm.b )xhbng28u ids along a level frictionless surface. They both dhgubbz) d;8n 82mix .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 h.jp5nzqppc+ojs2y ) jb23 :c$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative forcc8w :ud4z d3u8ujsxp5es.wsdzc ud uj4x:u8p538

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 frictiyu+t (;3nv +daray*b oon is present), to the ground below+( t;*ado3aybvry n+ u. 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 J of kinetic energy. Do not ignore air xq:a9q1 wb v(dresistance. How x dwaq9(v:1qbmuch 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 dis9be is2 .rr7upo-/u twtance and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much /ps.e 9 ur7uwob-it2rkinetic 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 of enerjdbdiddg2 (.cr.2s5 bb xw5t/ gy.

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 isj wbh r/-d(q+n

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 expr-:7iqv ezf *mx1bl/8w* puz phessed 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 yf(lar(*.eupof 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, yourib 5tkcx9 :u8 did 3 times the work in one-third the time. To do so, your power output must r8x5:cu itbk9 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 accelerati .b xrh/:cnkt0b0qbhaze+h 8 :on, 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 vertiu:z9pp*wu7la :x ( iyycally 2.0 m and held there. If the object weighs 90 N, hwai*(u 9yl ::zp up7xyow much work 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 air a distance of 1.0 m,3+h9cu g l hk0fhxt6:f at a constant velocity of 0.50 m/s. What is the work done by the wh t0:h 9f3+cukxf hgl6eight 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 f(7qd1cu g4 eh spyp0+y 2,wxkcor a distance q(1pg 7u+c 2 ,0dywceyxkh4sp 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 is pulled upward with a convs9r.jm7;;ky y8n -zng7vx: myurv0ea 10epqstant force of 5500 N for a distance of 50.0 m. What is the work do n.v1vav;-e7 jexm;r8yzm0k q : yu7rn9 ypg0sne 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 zt pp;vy :4k ,eypf3xx-thi- /N for a distance of 50.0 m. What is the net work done on the eleyx-p3zv/t y:x-ket i, 4hpp;fvator?

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 ar +ko.iu ubvwttk-,i+jz73 y4 $37^{\circ}$ 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 fruite7e f+ * ieuhdoi7;k9c)zm lh4 slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his littl 8ovm6, d6hajve sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anvv86 jhoad6 m,gle 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 i, d i-uo)sb+4 5n(bfbpe dmi6cbr u+5tn Fig. 6-1 shows the force versus the object's position. Find the work done when the object movf5bd,5+us- cmte pbru+iob6di n)( b4es 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 ij jk)7 hu9wwq6n the direction of the force. The graph in Fig. 6-1 shows the force versus the 6 jkuw9jqh 7)wobject's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph bqi:a6 ts6l +gin Fig. 6-1 shows the force versus the objec6 qtbl+ 6ai:gst'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 graphmlr/zpqvpb12 (/, t7-+kgia imy mb-m in Fig. 6-1 shows the force versus the object's position. Find the work done when the o rkym p b -,pz7 +(lg/2/ivqma1m-mtibbject moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initial2ebw9 x;lng0o .n6amyly at rest) across a 10 m level surface. What is the final kbx;60.mo9ne2w galn yinetic 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 h c/hqsrv3t h z0ej 7k7h5tzl;p;u 4a7to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of/r;hs h7e4tzqav c;hz5lt7j3uh 0k7 p 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. dh*2k6o8s/pueoboz4go6 :dc e2fw/j How much work is required to stop tc*u z6o42 os 2p:bkoe / 8eoh/dg6jfwdhe mass?

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 aewqepkx8i95l 4q4al9cv 7r8w t 25 m/s, what distance is required to stop a car moving at 50k9rw8ale 9ev qq75px48l ic 4w 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 cok pqmtu)bl5 e wu,+9p8cked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wilp9u5 wm )lq,kt+pb u8el the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical compon: )knzvg*r dfz.7w ;bnent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the flovzz ; wbn*.:7fg k)rdnor. 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 shotoux a8.*gp04 k.q.cizq8l eno horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cmoizla0oe. u4*x8.c gqpk 8n .q 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 moincr g77k3c:zved from a height of 7.00 m above a floor to a height of 13.0 m above the fcz7c7 g3r :kinloor. 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. The plane is 4.0 m l 5 4jy7qfswtt*ong and rises 2.0 m. If the plane is frictionless, how much work was done twf5j74y *qt sby 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 pz,m m81u8kjg len0*lis the s*8kj ,1zn0elmm8pg u lpring 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 spring constant of 60 N/m. How much potential en* 7, wr pke5u1nqodgb28 f.hbiergbg hqnf.dbeu758ok* p2 w1ir,y does it 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 comdird ml0,d;: /: p)hobdq ;fhopress an initially uncompressed spring with a spring constant of ;: b,h /qddf om)h idpldro;0:25 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 +bpb+jfiy5nw)2 ph e,9 9dn cjj 8m;qvof spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched posityn)bdp i29 ,jjv+he; pf+w 89nq cj5bmion 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 1ws+7-,npo mc g5 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring ,+7p -oncswm gan 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 500c s e3ou70cufu g2c 9gyc-mu3-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frictcsuueo09cfu7 g 2c gu3m0cy3 -ion.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an inis/uxe3 (8twwh tial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatitws8 w/h3 xu(eon?

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. Atq 6b-8;s;a ysw emdv)r the bottom, it has a speed of 9.80 m/s. What is thedsw-ev ;8s)y6 br; mqa 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 th+psnrq:m* gg2 -nq3 ume floor. When it is 0.70 m above the floor, its potential energy exactly eq n*pn3 -2+qmsgmu:g rquals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground z m*i93uxmy g(:3+o mld,acalve75 fllevel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical mi 5z3efyl7 m9*+gdlua(l 3o:a c,mvx 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 pmy6g:o m3i46 sr z)pbthe ground with a kinetic energy of 220 J. At the highest point iz4)36i m:osp mgr6 ypbn its trajectory, its kinetic 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 4ie w;e;(vxwdk x64l/ x5 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 slope, which is 30 m above the bottom of4e/xdwxx i( kv ;6;wle the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a spe0okh - x hca7..8poldoed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect frictoa8 hc.o-7pl.xkoh d0ion, 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 starz1+7va b)b) jyuxj4vw zn*u e1ts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the zavjjbxuey * 1nzv7 4+)wu)b 1speed 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 its swi4tpfj/las-/b-r sh(l*n, jsojvd 5u+ ng (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 c5 ue9 j8 nuxz7pthby26m away from the vertical axis and released from rest. What will be its speed at the botto7e jb nzy6u59px8u2t hm of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal bv gv(k38*grcpcaiquu qj6b2sq 43e/5 wx3e3spring with spring cons*b3k3/bruqa i( 4vc uqejg33v 6ewcxgq p 52s8tant 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 8 i1i.zbj((u1mije67oyj qz ;7m gscc red light. What work is done by the frictionz 7 ; 7cuyq6bm (sc1.e io1ji(gzim8jj 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 60.0tc7 ynf2 w8hl:0m+ubr-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dis7fr:nby hl8t2 c0u+mw tance 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 movd-w6e:)k* uiikxy8l v0w9si ying on a rough, level surface. It has 24 J of kinetic energy. The friction force ov)ui0ie -d:wsi6wl*k8y y9kx n 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 appl7fc6zg-) mxbsied horizontally to a 2.0-kg mass on a level surface. 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 change in fxm7-b6g s)zc 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 5aq*gscm 6 .-gus9n5n1a w /lq;t/vtky 0-m high slope. If the work done by friction mst n9u 1;-.waqtg l5* gsnq6kavc//y 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 me-(0 kivbqf1 z.-anpd long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magkb -paf-(z d 1nq0.evinitude 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 fro7a i1o-gp isan0:y *qom rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane ig7 s apqon:* yii01ao-s 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 heigh(r8n 4ogs+pp tt of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Wrs n(+po84gtphat average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flightokip. uxom+t(vw ,) 0 kokwf;- of stairs 10.0-m highkkxoopf;tkm.w - u 0v)i(+,ow, 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 mw bnm 3ho,mk -3-x8ptqove an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the f-83 thk ,w3mo- qmbnpxorce?

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 ee*;hwro(rd2. azqo il78 yu-vnergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp2oq7l- (r iyw*a edz.uvo;r8h = 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How muz/mow 14z3qn l-rvp -tch force does her foot3v n1z-m-wzl orq4/tp 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 to 25 m/s in 7.0 s. What is the average power l7u- am)xfhuu2r k25hdelivered by the m2uhklu7 ru h-fax25) engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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