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

1#

What is the correct unit of work expressed in ms d0 zjc;yq+-)ntrns )w/s v;SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no r )8 sy:5,8u(zhbx zx+iz szxg8higp) 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, the amount of wcn74 m n(;kjxu64 ,/kvb htjlkork yov4cnknj,;k( kj6hm47 lux tb/u 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 mvw9/b0grgv)3 rn5z+fy ib;b u:pgnw. uch work is being done in holding the box in this poz ywbuvnb)r+0n3/vf ; :g w9g5.bpgirsition?

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 horizont*(.f ,hin: gy0z4g b q8 vqg)umbtyo8jally forward at a constant velocity carrying a 10-N objecqb*n8g)y(qhf,myg0 ogb: z8u.j4i tvt, the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned tw tus.y e(p;f3q :z)glo its original position. If the totp.l; y q)w:fg uz3t(esal weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal fnzzb(8n ,rxs7 orce 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 grgfuhtsi-ld+ 25* v9m7ym+ ddkavity while the ball goes up with the sign of the work done by gravity while it gohf+5v7 d+9tmim l*syd-k d2uges 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 Forc6;6o4/ j aayjotto2skfq1dzz9, ) upz ydy61we versus position (F vs. x) graph, represents69zzjyko4yz/ottu)6so 1 q1fjw yd2daa ,;p6

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 positi/4a (ennk 2c,ddzb ,):udgnvoon (F vs. x), what represents the work done by t/2) nz:a beudn4n,o (cdv,dk ghe 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 posits a1r0mawkfz4 :u2q z5 a4d l99vuxd5wive, 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 86deh g8 rf9(mq7biquobject 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 doneu 1 e5pubok pg4-jqf01 on an object is 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 much as a car, and is moving at twice the speed of the lb7)ah+o3rs ocar. Which statement is true about the truck's kinetic energy compared t+ as )o7r3olbho 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 the6-o ln/fc- zzy mass of car K. The kinetic energy of car J, compared to car K is/ yfn l-zc6zo-

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 p7x.uq agp.v*with half of its original speed. What is tp7vxp.qa.g *uhe ratio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a sper; eo f-re)5cyvfij2le kq7o(1+t(su ed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the rati+jf (yc(5rf;qi7 kr-)2euot1oevlse o 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 sp70uu a((3cv ji u(jasjeed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounjj(0aia7uvus j3u c(( ter the same constant 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 ovy :av x18i-ecar in a panic, and skid a certain distance on a straight, level road. If you ieva-ox:1vy8 had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an e1esva2qz 3*z + 9izgsflliptical orbit. Neglecting any friction effsgiea2 *z zz1sq3v9f+ects, 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 principlbqy5x4b;8*s d4 puea)h x,fuce.

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 hagkmppadk 2an)5 w;pn32w+fu) x3 ;ckfve negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a hei2 tm oap):hi+qght h above the ground. A second object with four times the mass of the first if released from the same height. The potential energtip o:q2hma)+ y of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of av bu7c0q2iv*q spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will be7vu0 b qiv*c2q

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 energyaognp8e ( p4(q 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 kik9h(wu(fj5 )v , lvzwknetic energy K, to its potential energy Uku wvhkz f,lv)w(j5(9 .

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 oflg*sc bil,g34c+ yiehr *( ;dk a car driving 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 objusb 1squw+4*jsgn13 fect are sliding with equal speeds along a level frictionless surface. They both slide up the same +j1wfs4q* us s3g1ubnfrictionless 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 dcq o-c9v g(z26f( ctu$m_{1}$ 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 q qnljj8te+fjg x6)70 of conservation of mechanical energy for conservative forces+nte760jljg8 f jqx)q .

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, thr- g,yon+l/9pnjhou t) z2kps4ough the air (air friction is present), to the ground below. How doesgt-o y +pz)puj4h s,9no2nk/l 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 a (oubr.chcz2 3nd gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy.zc u3rcob2( h 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 cx3 ipb:8h.i5wy/tx q of gravitational potential energy. Do not ignore air resistance. b85p/ytqwci h3 .ix x: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 conservac-m.d4nyit: dtion of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is)q txyc8zjguzg02 00 j+ywdg7

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 exz0wzdb :bxe55pressed 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 no7n9ov-ypu1t4rrd z u* t 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 didf3bv hz/(0tajz5 v3 pr f0 gtgr7r5le) 3 times the work in one-third the time. To do so,0pbl (f tht gzzr)raejfg3vr/0735 5v your 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 ay c,) qmird+uo y9j*a:4td bq2t a constant 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 su t:w 2lae,2io/ jkp/k9hyl.vertically 2.0 m and held there. If the object weighs 90 N, how much work was donlukyl i j,p /k9:2o.h/2 swatee 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 constant ve*b/0 msqdyv u(locity of 0.50 m/s. What is the work done by the weight of *yum dsb/q0v(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 for a mnjyi(3) f z5kdistance of 50f 3jm izynk(5).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 pula il1 0hwc/v6 b r4yi8ne:*odyled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of th h64vywia*rnc0:b y8ei l1d/oe 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 wi )ft*m,3kzt1pb ce w6wth a constant force of 5500 N for a distance of 50.0 m. What is the net work done ww1 t6*,m 3ckftbze)pon 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 ee52oeo l(fmb q22-l ja nnk,4m up 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 m down a ramp, inc wdpvl w;)ikqn) eq8(p9wh:/ rlined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no frfw+09jlj:w zdt..oo uict0tf+u.ol9wo w:zd. j jion), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of tho0nnxz.3tz-r) d/n-tl, zanwe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thz/n0r. lxtnnztn a), 3-z-odw e 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 x wvsf 23a,lu*of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object m xf, *laws3vu2oves 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.u cape2hz(76 ap9 ,udgaulz ) force. The graph in Fig. 6-1 shows the force versus the objeca(7 zapl dhaue9g),6 2. czpuut'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;n)6,fld6zzsp) gi cx force. The graph in Fig. 6-1 shows the forc;fdlzncp,6i zg) 6xs)e versus the object's position. Find the work done 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 applied to )np8l+y)s y/c zufle35q4cpl move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the 5 sc/q8p3fz yulc4)npel l)+ycart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at rexbml/p,3e-lx x 6s/vv st) across a 10 m le-xpv,/l mel6s x/vb x3vel 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;us-+gtrji ewh6j : f4.0 m/s. How much work is required to stop the f rj u;e4g+h i:-6jstwmass?

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, whatox7.jv..d3jfcewsw - distance is requeswd j7vco-x.w. 3f .jired to stop 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 dartde-s,a 2kac2pg:j4 n a gun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave thegd-c ja2k a 4,sp:an2e 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 component ofz */xq e6qp2ij 60 N. The force is applied to a box which rests on a leveli/2zq6e* jqpx frictionless 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 horip chx72qhmm -i+9 ton2oli3:hzontally into a bale of hay, striking the hay with a velocity of 60 m/s. It opo3ximh9+ ti7q: mhc-2nh l 2penetrates a depth of 20 cm 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 moved from a height of 7.mk*-(pug yahn (u ze6400 m above a floor to a height of 13.0 m above the floor. What is the change g- (p*4hu(mknza y6uein 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 4.0mux/y 9zvan4t0rqr19a u i6n hs n,((l m long and rises 2.0 m. If the plane is frictionless, how/ luuvnz0 41(msatnqrx , n6( ira99yh much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. W50)y 7y8x vwhz16l q/shyalb lhat is the spring 0vwhz8xh6syb1)7lq/l y y5alconstant?

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 a36i vufwd )0 ep0poo)n spring constant of 60 N/m. How much potential energy does it store, when stretched bywnoie6)0f)pu pd0 o v3 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 requir scymn+e1. 5 2f s8lj z7h *37edlyyxou.cuo6red to compress an initially uncompressed spring with a sp3yy7z uofld x* .6+es1hy8ljcc7es5o m2 u.nrring 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 ofg;5 yshv frn5ik;b.izu / l4+f spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0. fs;55iuibkvf yhz.;+gr/n4l )

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 constaj 9cede kf(.i+nt of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.efi.kd(9+ ec j0 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 thenq(4i1 ss pye.w:rg 2j top of a 50-m high slope. What is the speed of the slier on reac n:wegs4(2j.qy1 risphing the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kgr80 q(y:z3g2yei l je 0:pnewe, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will yepz(8gnyi :3re2 :wjee00ql 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 frictionless inclined planetgr/ 0vumwjpd 6; qaf y5nfhw29w17u7 . At the bottom, it has a speed of 9.80 m/s. What is the vertical height of thduwfum7 tv 5qy09ag2p1jfh;7ww n/r 6 e 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 floornz pz2(c4y x.j. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. jzx( 4yzpn 2c.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 level with a kinetc+clc1c(f:ly/d( i47t mrjq kwizd 08ic energy of 40 Ji 48t7c w 01cq:l(ydcdirczk f/(+m lj. 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 with a kinetic energy of 220 J. At vp bhs.(yiz 2 u/:bt ky k3s+2u:u1vidthe highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launchb 2bhu3 visy :tu(/uv2:.1kszpd+iky point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m abohatdt - 5hc9 /79zizuove 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, whic-o h/d5uhzt t9ca7 9zih is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the botp(k27 sqbh czsz2;m:- hv/ovhtom of a dip (See Fig. 6-2). Neglect friction, what will be the ss7p ozbz2hh/h: mkc v;2 qsv-(peed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above them.8zwi+eoj8 0n.jzwird/ cl4 bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, whaendcir 08.ol+z4/w mz.wijj8t 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 tv2:n p1 e,v ipnrx-y7swing (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 3d ,xrpmp-m/ :e0 cm away from the vertical axis and released from rest. What will be its speedpmm x-/:epd r, at the bottom 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 ulp7kdo 8 2e/ukncompressed horizontal spring with spring coud k7/kpleo82nstant 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 down9q hs6ex +4cpn her 2000 kg car to stop for a red light. What work is done by the frictisnep 4 9+ch6xqon 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 .1hj1 qz8f s:cqd;sfha horizontal surface is 50.0 N. If the initial spesf 1 jh .1qqhz8df:cs;ed of the object is 25.0 m/s, what distance 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 moving on a rough, level surface. It has 24 J of kinet n m j9gd/,pruqm9b*e(ic energy9(m p/ 9dr q,b*jnmueg. The friction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-l4),b.)v orkx/ amuo( oq ,y oachba63kg mass on a level surface. The coefficient of kinetic fric4 r,y(ol ko /aoh b)xoa)qv b,m6.a3uction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a pdk7*m.mh x.(8ioolf50-m high slope. If the work done by friction is7d o8hm.*o.(xifp lkm $-6.0 \times 10^{3} \; J$, 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 incl,+ofn ghmxo+b bl8h0)ined plane. 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 of the o)o,l fbmhn0x+ g8+bhaverage 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 a plane inclined a5w282acghz -. p(icxtx k/* gvg-wzjg t 20e above horizontal. The coefficient of kin c-xzgh*x g2w g25-. zc( gjw8apk/vitetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and stri8*am ds;;jwl kg.tw; ikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it fal*dsk; 8; l.wj; gwtaimls?

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 wouwp uq2 czyol 6:c/qn 2v(2auj/+ j*when he runs up a flight of stairs 10.0-/u2v6l cna j+ wju po*2q(wy2qoz /:ucm 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 / :cutqmsqri6 40sh-x with a constant velocity of 5.0 m/s. What power must be del rx:c0s-4 6 qsqh/mtuiivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 9z x1y7z gr.ichp =7 rciz1ygx .9z 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 4+ied2f w7-sz:sa0ir5 4isbhk k3b mb3dxyf. the rate of 500 W while riding. How much force does her foot push 7k bbf wdsb e 534zsm+h.sir ik3fai2d0:4xy- 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 p(.ie0 nq, vlg7.0 s. What is the average power delivered bq,(enil vgp0.y the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95