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

1#

What is the correct unit of work expressed *jhq.au3p56/ ftvx9vq kt h 3 4rr3svr :uwwc0in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there)yzwhlg5diaq * d1q e *;yt9n(nqf+o1 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 stati--am,w fe): +lj5l fodx5 rpmgonary brick wall, the amount of work you 5x+rpm)gd j-ow fal-e m: 5lf,do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How much wo hiu f4 sp/6smx)+y+ghrk is being done in holding the box / s6)+g f4ysup+ imxhhin this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant vel(v.mxm *lim*g*pncpf ,o l*y5ocity carrying a 10-N object, thevnp fmplgxc*loy*,*m( *m5.i 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 lyn2-rrs9 j (amifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work w9r2m (r-jn asyas 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 foj sf/)qnws; kppz;/4rrce acting on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by grl *khq- dzeknxk9 62l7avity while the ball goes up with the sign of the work done by gravity hk x2*lqdk lke6- n9z7while 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 po5-ntik rz h ;:-qys8nisition (F vs. x) graph, represents-i8nqik5z-nrs ;hy:t

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work do nw2ab26h j(zmne by thzmn 2(ha2wj6b e 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 o1, hh8 w mpo5szzb9;vvn an object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done m3hc1:ht/p 1 lnx-effeyy.)son an 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 thx.y;3 hlusq9qe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and b 79wn*kz8 txris moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to tha98b nxzw*rtk7 t 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, nu0ch8 knms*u8 4qebc 8t 81tcand car J has half the mass of car K. The kinetic8n8 0tbs 4* c q8ehuk8tmuncc1 energy 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. nhtk kn91a3 u2What is the ratio of the fin u2 t913nhnkakal kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is movo +o f:z qhbtv-(,/ganz:. heding at a speed of 5 m/s. If botoav dg,zq+h.fzo: /tb(ehn- :h objects have the same kinetic energy, 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-k dju qm41*kyf1g mass is moving with speed 4.0 m/s. Both objects encounter the same const*4qkjyd1 u1fmant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your pudiav.ju:lf8js v q+l. k/8( car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the sf jllpv(a vd+ i ujs:qku/8..8ame 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 p/3.huacawf-b 4q8nporbits the Sun in an elliptical orbit. Neglecting any .qfpc-hnbwu3p a/ 8a 4friction 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 pri wd +o 1)rnz. s/de9mx-t3ytbgnciple.

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 nwe wq1;u*xw(p/ns ju4egative 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 resc4ea.k68h *duhf jfg)t 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 energy of the second object compared to the first f cdk86g aehjfh *4u).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 the8(fm n5xxu 5 prdt )m7,szlue; end of a spring causes it to stretch 5.0 cm. If anp z5ml,n )df; tmu5eusr8x( x7other 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical enerdddy)i;- zhhjt;5sw 4 gy 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 potenti,4knece;2 i 7)3xtsc8mg qwe)mu h 9jtal energuje,i;k g)t8cm )h et3n9qsc4xw72em y 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 drip zh1iqbv5 u wr8scfddal. 100;15o pjving 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 vt* zzm;). dxaqery heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionles;qtz)d *a x.zms 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 , 8 xy/bw2bq *kzm,lvt$m_{1}$ 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 conservatuv ef,+yul( pyomv9m4,kp l)o) ,e 7pvion of mechanical energy for conservative forces.e )mvl4f+7,pp(,9y,)umo o vluk p yve

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 ; jxz j-tgrpb u(/98ntbuilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the bui;8ntj/bjgr 9- zpxtu( lding?

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 kin1eiz9j s,pc 0ao7 + 5zqujc40)mx2x d9cnxrkj etic energy. Do not ignore air resistance. How much gravitational potentialdjc7k c42j59msp o ,q9x)xex+0ju 0izzrna1 c energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potential energ 49me2p xchs6bh l,)jhy. Do not xhhc,ps62)j9hml4 b eignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of spkef 0;w0 x*dr2le7c(8u qmn 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 isn( dvm-w+coe1 e,-z8h;abe1 p6cy x uv

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 ekqis ar 188hwu3(z nh9z/ v.v1ras a/-czc- ktxpressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of//gt1uxu hi5d77 0jqv00trhv2vx efv 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-thikbi1 , tzfq0l-rd the time. To do so, your power output must-1it k ,lqz0bf 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 car's engine mus,6mzm ( h0ixqtt

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weighs 90 Nxh,jtw :p +/su, how much wo,jtu pws: x/h+rk 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, at a c wcrk;u -+.iglonstant velocity of 0.50 m/s. What is the work done by the u;rli. wk+gc -weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant foyjf0phg1oqf 93m z .pa zp*u+-*-jjrh rce of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N force?+3fg qu-pzmhrpj- p*oa yjj1 *9z 0.hf

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 o9(hd x3.ei ta d)+wby- csy/bdf 5500 N for a distance of 50.0 m. What is the work done by the we e-9cda yd3hbyd/ (ws).i+tx bight 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 fo3 c jh)sfz/t+6km fzr/rce of 5500 N for a distance of 50.0 m. What isszzfr+j /)6h3kfc mt/ the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m 74ut3bo4 ag dpup along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 n jg/vfs8.k86t fdl giw9* on:wd+w52st5sod 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 lekwkzp-i5tkj*8 n5mc ,; ho2in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle of 5zhep kiok nlw;*c,82 t m5kj-$37^{\circ}$ 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 3; :w5mhnyzd0dc5r m vy0f vv,the force. The graph in Fig. 6-1 shows the force v 0v r 3cz;fndm myv:,dv5y0wh5ersus 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./gsl4 sm:ch849n obm e 6-1 shows the force versus the ob84s hmngbsco49 le m:/ject'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 forc ab3-hez p.biaq no/*.e. The graph in Fig. 6-1 shows the force versus the object's position. Find tz-hbeo/. i q .apn*a3bhe 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 e jo.7(w/ls / +64qnca htnp.xfs/lkzthe direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donez7 xjcn././qsl+ek 4hl pf(/twao6ns when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applie.dmr9n2rt )mfli 7l.vd to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the camtn..l dvimr92) 7lr frt?

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 2006du3+gkg -7) w azzxww N is applied to move a 55-kg cart (initially at rest) acros7wz+)xu3wzk -6agg d ws 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 required to stb-jz/.asxy p 2j 3p-gqop thezpqx pjsg-a2/j b-3y. 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 25 m/s, what d 25mu y e7( omm08qvar izp;oznx3q(i6istance is required to stop a car moving at 50 m/s under the saip;o 8oxrqy6m5qvzun(7i a2(me0 3mzme condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a force +y,o6 yx eya-v /nkj/byk.ej ;of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negly xyab;y,jy. / e kk6-nvj/+oeigible 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 horiz 4vzw+ f4.pc.8jcdlt zontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless +c fzjwdc.lp8 4tzv4.floor. The cart starts from 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 horizon6 062 erd cn2-ydl-gvt8xf6foj +hvhptally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before +y2pjh 66-lrxnefgd h- t6 o2vvd0 c8fstopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m c-8 n* zssvg1qabove a floor to a height of 13.0 m above the floor. What is the change in gravitational pots vc1q8gs* z-nential 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 pz qrr 0*+bmg*.1 odotmlane is 4.0 m long and rises 2.0 m. If the plane is fricti* bdto +omrqgr0*.z1monless, 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 smhk )c r9u7o*7c7kjpm2g *as n z+p,tfpring, causes the spring to stretch 2.0 cm. What is the spck*z 277m)9chs*,p + ugp rkfjo 7tnamring 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 s ; eov,+ 4e7py6 bhtxtr4tecb:pring constant of 60 N/m. How much potential energy does it store, when strbe7r:ecyhtotp4e t bx,6+v 4; etched 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 requx3j53kqe r6j wired to compress an initially uncompressed spring with a s6jw5xqre k33j pring 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 spr1 6d4 voohye*ik4e5 naing constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position i 4o645a1ne od*yikhevs 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 coec7 ;enz(juq l)w w)ftz h7m;+mpressed by 3.0 cm. How much work is required to compress the spring an e ez7wzcj+m)u twn;;(7 h)lfqadditional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-wege: + no (j*8zspb/jm high slope. What is the speed of the slier on reaching the botj8*np sewgoz/ :j e+(btom 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, icn9h2ns/ c jm,u 1/l6-zqfbopushes off the top of a hill with an initial speed of 4.0 j6zf, -1bqs9/m i 2uoh cnc/lnm/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a fricte;.jadlfg m n 7p4)io6ionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the planl6im7;n.4g ) jaefdpoe?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. W i ybm*egf+ylf,:y28y hl2vw- hen it is 0.70 m above the floor, its potential ener2ve-lymwy, lyf* hb2 8+yfg i:gy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 Nf nr l r2z7d0cuz.vh9y ;v-v)h, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of idrv .yf;2hr7v-)v lcu9nzz0 hts trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic e 6zujrp o(lo*(nergy of 220 J. At the highest point in its trajectory, its kinetic u*6( (pjo orzlenergy 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 frn 3f 1rfsfu/.0 j-finndsg78eom rest 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 of the dip nn0sifde f7rug-s38. jf/f1 n?

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A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5. or(54 p )vmzys6207cfu-, usily vntj0 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 oj(),ty l2u0fr-zy5c sv niv6o s4m7puf the dip?

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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 starts9 m/v3kfeed - l9 2w7v izl1jmrt6wbw; at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect frict bie3l; zw9w1jfwm t2kd v-lm7v9/r 6eion, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (poi jcm9:bij,wmk 7iv6 k0nt

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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 from6bn/ a vg.wlb; the vertical axis and released from rest. What will be its speed at the bottom lwb /6gb;n.v aof 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 un /*axd. ::sxv z7tutsncompressed horizontal spring with springx/tst:*uavs dnx 7z.: constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 20t (2bu gmy:5x5qcfs8.nram6o zyy 0a300 kg car to stop for a red light. What work is done by the fric 0q6tfnr:2cg. zx58b ao(3ym5yay smution 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.nzee1ix ;hd8o gn*lbd5* /be (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 slidid8nd /1eozb ;(5**nxlhb g eee 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 (2rtdyn8 zpcvooo7-; rough, level surface. It has 24 J of kinetic energy. The f cp(;oon-rtv7doyz 28riction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontalx 4(pejnb960u t wmix;ly 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 mabj ( 9e;nmptxuw6x0i 4ss 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 /bj9nll:sloyaf 8/*m48 uiygrest from the top of a 50-m high slope. If the work done by fricta/8yu 4*olil/n l8 y:f 9jgsmbion 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. pogus;gy7j;ea;t * 45iwv (fk The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude o g;4f*7 ;jwkv(uey o5tgps;ai f the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of / c;m-a* znuinrd djlc4wg::8a plane inclined at 20e above horizontal. The coefficient of kinetic fric ucnmn zid::w4 d /r8*l-c;jagtion 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 10.0 m, and stria di3qb)3uxa.an4,xgkes the ground with a velocity of 7.00 m/s. What average f)aa. dg33 bx4a ,xqnuiorce 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 6l,l0mi bmm6va/ ud u(flight of stairs 10.0-m high, in(6dmu6a vmu,bl/li m0
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s.6 1b h8ycu3fp a;zf5;4ysnfgc What powerh ;f cz1cp3y5fa46y fnsb;g8u must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by ad3p) 1 :)dq zuuzxs5f,l zerd3 1.0 hp motor that runs for 1.0 hr? (1 hp = d)3 ue1 rds3,u)zdlpfzq5 zx: 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 o1*t9lsyo i h*of 500 W while riding. How much force does her foot push with when she is9 lho1*isy*to 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. ga:5qje8 ui* .6lrvxu6 e,b za What is the average power delivered by th q8aju6 e al.i5z:,xevbr*6gue engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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