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

1#

What is the correct unit of work expressed in Sq4pxk/l1 pdz, -6 :w( vaqqkdtI 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 n) .mrsvd ,eb(ro 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 2vvnngc -1+k xwall, the amount of work you 2xvcn1vkg n+-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 vertdvw+d v 6k (snd2a6)v0 m6adkpically and is being held there. How much work is being done in holding the boxn(s+v)d6 2d6 0avvpmdkk6wda 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 forwarrt *j35tet;b:mrw8y i d at a constant velocity carrying a 10-N object, the amount of worktm;rw5 *tri ye3b :jt8 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 ver ic*mm mrpnd)5v3 v)8ptically 3.0 m then returned to its original position. If the total weight is 30 N, how much workm* 5v3)8nr p)mcdpv mi 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 l0gj/ y90zdtsjjohjb7 dz (,(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 gravity w1rmptk8 av7a59e( mpp hile th8 9pt 5m kp1pr7aavme(e ball goes up with 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 versus position wv ;8 lnszdsw hxo;0;b18tex5(F vs. x) graph, representse8x5v t;obww ;zs ;d0x81h snl

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), whi52gypkdc;p. u sqpr,7 4v uh.at represents the work done by t 7h2p5r.;v kc syp.dq piu,4ughe force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kineti* m y,kyjj ,jb64rktel02.vqqc 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 an3cdr-r2pa,gmsd7 skb5+4ll yhfw 5h 3 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 kinefz 1 go5xok5:dtic 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 m ljz)vrv:.;i much as a car, and is moving at twice the speed of the car. Which statement is true abouv)zj :vml.ri ;t the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the masyn/ihusi ,sb00n jq/ szxa q6(ppq08- 2xrc.ds of car K. The kinetic energy oxz0sdhj/p-c6rqsa p.2(n0qx, yn8ib squ0/i f 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 sp3:f l1q0j snp e4udm3ueed. What is the ratio of thu3u p0qfljd4n: 1mes3e 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 t) uk.(dwn(8+,zgnuf/aybq/hdc q i(of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic .zg (bk/ wiuq,()hc ynndud/+(8qfatenergy, what 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 is moving with spz./d p md 03jasm5;grueed 4.0 m/s. Both objects encounter the same constant braking fo3sp;.zj50/d d mg umrarce, 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 skid a certain distance on4i(l7 eui4f3g8xi lelj-lay / a straight, level road. If you had been traveling twice as fast, what distance would (g e4lyel l74i 8iil3-fjua/xthe 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 s+ht+ *ln shbb(wb2+ d(4vvhyhd4: joelliptical orbit. Neglecting any fwsjn+ tbd* 2+yh slb4vo4v(h:+ (hbdhriction 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 prinm u0ls)u st t/.bfslqwdwa92+ 8t 0oj;ciple.

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 negativs89ynse h.keubwk ql1j+1t- ,e 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 object di 9kw(j cr7b8with four times the mass of the first if released from the same height. The potential energy of the second objeckbj79c d r8iw(t 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 atwn ;-azbblt6, eu ar2jgv)ud08y 57c spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, th6 l-rd)j 87t bu,nvz ;5 ub0wgcya2etae 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 nrdgu1ub)s6yz , , -8- veaqrxenergy 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, l3m 0o-9rn hg)g6k f;nx-b0rezvi5vj to its potential energy-o6r j3 x v5lmnge)igfnr9k- v z0hb;0 U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hiwz9t/j.krsp ;7ve4 ifll.

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 vwyte bfx6 1w:cug,+4tery heavy object are sliding with equal speeds along a level frictionless surface. They both slide up thg6 4u1w : bywx+tftce,e 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 qgk5ji/z5 09qys zt9b$m_{1}$ 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 ene37hgtz:e/d l zqf6mwzi ( vd;,rgy for conservative forces36ihqd/g(tzel vw fz7m z: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 buildinrbi r3ialge (8 932dovg, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potentia dir8 (v9rbi2ae3gl3 ol 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 notr1,p gal:61a5wwcccl ignore air resistance. How much gravitational poten g5lp1 wa1cc:cw ,6rlatial 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 lose:0q w) t-sdyhxs 30 J of gravitational potential energy. Do not ignore air resistance:yt)q -w0 hxsd. 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 of en8fzoeyhc 1vf+x,c8p) ergy.

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 isi+xyy+4 h0nj x

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in Svlo rro :gwwv:b (; y(3/hthu9I 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 y2dr/gh gz z0+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 d ga 0*em,u1f3lurlsg8m-u,x t o so, your*lgra umu ,l83tsme0,xg1u-f power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant)z0valgy*d .vt4u m(eiq u*r2 acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted verticalhe cz0 u*v*3;,3*u q kgyl zftjt6e)cbly 2.0 m and held there. If the object weighs 90 N, how much worktz3 )tlc evzk;gj eu3*0u6 yhqb*c f*, 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 distancmcyh -wqz5veoysnj 4 6z/ f/t/z-z76ze of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the booz /m-vq5z7 n6jo4ztzw/s y-6c /y zfhek?

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 for a distz;rbe4vkey (x ws3axw1b.+ 5o31 cmrzance of 50.0 m. What is the work done by the 5oxs (bvw bmwk34+ azz15 .yrec1x3r;e500 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 wit c -uc b1n,i6yw/sv/r)fts:rxh a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of tt6/wsb yx ni-1:rccsuvr/,) fhe 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 up 8,l y(*3bi-yko)e iyr6; piqy9bash rward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done onpyir6 ql- a8b(3yor,hisy ei*y b)k9; 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 alm h;q;d: i,a3bhzzxs p4*hag29 pko.oong 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. xg5 8zdxh10xm0 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 ibss23 4bgcjvf t));g bn uu/w3n a sled on an icy surface (assume no friction), with a force of 60.;gs v)4)23sbfjnbwu t cu/3bg0 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 inuir hn9+kyhc/ )x;7ka Fig. 6-1 shows the force versus the object's position. Find the wo/yr x;7hc9+ak)kih nurk 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 ;vu -rp y76tux2yg s0sthe direction of the force. The graph in Fig. 6-1 shows the force veyssu-ru6 y 72x gvt;p0rsus 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 graph in Fig. 6-0ep )fx( cf ma2+rw4( )gd;uu2c h myqlfy2rd:1 shows the force versus the object's position. Find the work +uxr;)24u q2 (0d g 2myyffwmlpdc(rc)h:afedone 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 e(1 z5wp )f.8zfhvsy)a-rt g9p h qe)fthe 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 from 0 tg f vq(h 8e 9fw.5tpr-))1zp)ysezf hao 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 (initially at res98/ncm 54buqyhb nuo9 t) across a 10 m level surface.8nb5buqmoc9 9n y hu/4 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 appl ,q)u6,ba nqclied to move a 55-kg cart (initially at rest) acrossl,)ub ,qqn 6ca a 10 m level 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 speed of 5.0 m/s. How much work is reqcxc4c gx15dc/ igrxpn4k5-k 4uired to stog gkxx nipc14 c45rdx5/c- 4ckp the 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 at 2r4+bzg38r yrqmf;2 u u5 m/s, what distance is required to f2gy8qu+z br;u r4m3rstop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g daln0 5zofz4z(l7l u 5(nhox9hy rt. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the n0h5(ulx zz ofn5 h4oy7(9zllgun, 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 componen*l eng(uj 5,zvt of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. Whanj 5lvgz*, (eut is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, sx v/ne7eh*22r1ob6tmulw - ectriking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the7o21lbcu*2 etxv e6/mnwhe -r average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to a height of 8w3/ jugqou nisw6:x o)cv..h1g :q.n .ows3wh 8vijxu uc/6)o3.0 m above the 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. .i9b4tp7h(/ r nwaixse,xr+y The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done bpi7n r9xwxei(.yr,4 a s/ht+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 izu1item l54w7m kpu6 w:g/s9 the spring to stretch 2.0 cm. What is the s 69i/4gm1mezt s5wwk:u pi7ulpring 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/m5c a+.vdq djt0. How much potential energy does it store, when stretche5dtqjv d.+0 cad 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 initiallyizeeagm w6if1wt2-v: wz+- r, uncompressed spring with a spring constant of 25 N/m by 10awivww 1ezref zt i,-:2m+6g - 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 sn7ut3ux-4i d 7pqt8v ppring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the uv3ut-t48pnq x 7pid7unstretched 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 1lq niro9.6bm7llg/gvd2 +3fq 5 N/m is initially compressed by 3.0 cm. How much 9mog7 n6qg +frd.l3ll/v2biqwork is required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50dr4 i67ahyrt yk,gp5 1-m high slope. What is the speed of the skier on reaching the bottom of the slope? (neglect fri 5y1r6 yprkgita7,h 4dction)

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, pusi) ;)pealvg s .wg-t;thes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dre- tiltswpg;g)v.a); opping 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 has a-9 k,vjnhksl/ls5 r-ic(r u-ug/7b ki speed of 9.80 m/s. What is the vertical-- 9(ig75brkli/uluh n,j ckkv/r-ss 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 3 cbm +;ec)-,t snkd elulr0y3floor. When it is 0.70 m above the floor, its potential energy exactl t3,);0l-bmkunyce3sec+ r d ly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up frc zdeam:ip,u 73 o7d1iom ground level with a kinetic energy of 40 Jdmaie:z, i1 up7co37d. 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 withk13zc4zx*dxf) feo50h fz hj/ a kinetic energy of 220 J. At the highest k 03xch1 f* jff4)zezzxd/o5hpoint in 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 at5hpp r dobk9(a8q3;q i6puoc5 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 slope, which is 30 m op8 ck5bhd3(a qprq9i 6;pu5 oabove the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of v jb9*z+(b d gz6ek6va5.0 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 top of the next slope, which is 30 m above the bottom odvk *bzgjz6e6+abv( 9 f 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 e4r5sj1me j*zbz; ce6 the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at teje5j*m 1c6zr ezsb4 ;he 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 swi5xy tf 8, 0wiufagi *.ffv-cn y3tv):kng (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 cm is pulled 0.3p 3r03l-6 .(q z+llqlgxbyh pv0 m away from the vertical axis and released from rest. y-6lq3vh0glz3 x ( +rqbl. plpWhat will be its speed at the bottom of its swing?

A. 0.42 m/s

B. 1.12 m/s

C. 1.68 m/s

D. 1.40 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 horiz;t-p a u7pumm4ontal spring with spring cons7u-umpt ;m4patant 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 carbo2vcd7 3w8e ) mgwfc8hw i9(r to stop for a red light. giww9r v c7mbw8c( )82hodf3e What work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal kq)h-ouy j3+c surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it sljq-c+ 3ou) yhkide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface.c+c)l dmc.vkg)x0 k;e It has 24 J of kinetic energy. The friction force on + vd.kcm);lkg cc x)0eit 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 surfaceh4usxbhj h5z*5h)xr,cpy5 m; . The coefficient of kinetic friction between the mass and the surface ib54;mhu ,55phxchyx rsjzh )*s 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 x:(cth.(v )vpgke w +ffrom the top of a 50-m high slope. If the work done by friction isf)wtc gpe k.:+h(vx( v $-6.0 \times 10^{3} \; J$, 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. The plane x xt :wo6-/umiis 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. What was the magnitude of the average friction force on the mwoi-/xtu :6x box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a pladscsva 74* 0glne inclined at 20e above horizontal. The coefficient of kinetic friction betweea70 scs*vld4 gn 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 10.0q75yx9 74s*:+m8xd zqy3y drvop p gwi m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it ax 3:ypvrdg 8pw4id57q9qzyxso m *y+7s 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 stair uta w8c,-esaixp:q ,6s 10i8us,6 ,eqxw -:tpcaa.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constan3 ds 31x3-s4nlylcdmbt velocity of 5.0 m/s. What power must n33 by4s3lddslm-c1xbe 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 usedonne io4/qo) tm/4q)a by a 1.0 hp motor that runs for 1.0 hr? (1 hp ome4tni4noaq/) o q)/ = 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 muymg+xp9 enc: 9gj(.cqkqa*,u ch force does her foot push with when sh(+kgmuxqp. :jc n9cqya* ,ge9e 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 r)(9blr x(hx qin 7.0 s. What is the average power delivered by the engine? (1 hp = )9hx(qrblr x( 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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