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

1#

What is the correct unit of ibf;e 75.kl;g gqc(tze)lj:a work expressed in 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 3)g2ntmpecqfj k7gm5:)9s loif there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard agai8t f ftu:f*ao f31(xkunst a stationary brick wall, the amount of work yout8f1o(*xutf :ak3 f uf 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 verticallyejv, )c uqion-9mk8o )oire63 and is being held there. How much work is being done in holding the box in this uq)9e8k i3mvce6 rno-oj i)o,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 horizontah)8cm4314t s6nkxw+) ifxnq1yv wdz n8ly hg 9lly forward at a constant velocity carrying a 10-N object, the ansnyv4c 1mt+k i49y wxghq)wlxzh 3d 8n18f6) mount 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 verticallyg0ht ys7 ;q;1o dl1 a*nkw6j7dlb 3uvp 3.0 m then returned to its original position. If th 3; b*1u17qd6l j;aghw7 0ktposlvynde total 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 force acting o;pp+pm4t;(8q4 f/gn * igwkou .mkqu ln 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 grm6xxyhnrrt4) )ck ( 7ztxde;p 8 9g0vgavity while t4h)t 8vc(px ;yrzkgxnd ) 06xrgem79 the 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 pownrta,2mi ka+b3ax*u6p0e1yjex/ s 5 sition (F vs. x) graph, representsautp n*1 ieys j5xem6+wk r2/0 3x,aba

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 vs// -judz3 v)-rxozz iy0iad3ersus position (F vs. x), what represents the work done by the force iy-/vzj x3 0s)iu3d- ad/zrzoF?

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 v4sx7 ;.iw /shtz,msithe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinetic ek0.d ntpc 60knnergy

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 i v12qmcgno.h(80 ndfb 6,mpm/re0co 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 muc/ c8txzqh)i*yod )c(ch as a car, and is moving at twice the speed of the car. Which statement )c( octxyihz*d )8c/qis true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J h fe+pbf8)7 gy g:am2l 5xwr*gfas half the mass of car K. The kinetic energ*lbxg fp:f8aye)gfr+ wmg752y 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 suq9g o03sqf;jpeed. What is the ratio of the fi q 3o09u;gsjfqnal 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 acra0g ;;f4ctw pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?tc4gc0f;r w;a

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 s8ruie hxr: 6t5peed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which 6exu:r t8 h5irobject 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 youixmj-bu( 0.xi3)b mf+zgvf 6u r 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 thi () 3xig0xbb zjfum6+mf -vu.e 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 elliptical orbit. l2 mrorh34,lh Neglecting any friction effects, wha h3l4omr2l ,hrt 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 princi(f exoqv4i*c6 ple.

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 negative potential energym,ko9rj3rh k*q 8jab0z (fe u*?

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 obje nz-z/ ,n1n/ux9grghuct with1x/r/gzznu hg ,n9 nu- four times the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spri* -o bg)bfaymtlx06p(vbt(e 1ng causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring )(fb01oe*tpblxbyv(m -t a 6gwill 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 energimyvzol .s x/ia92f+0y 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 una-,fnvog )reqo+0;its kinetic energy K, to its potential energyervf a+ ouong)q,-n ;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 drivhi x,pgpk8 x59ing up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with eq5wtd33eu(u ue,dvr/ u ual speeds along a level frictionless surface. Tt,r( /3u5dw eu ve3duuhey both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses *kaw2tgk4hvbe 9lof00 uzt*3$m_{1}$ 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 conservatidv zvrd5y86 *h6ztd gd exm7,.on of mechanical energy for conservative forcesdr.e g7 m*6zvdzhy5x v d68,dt.

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 buildkxv2xjiz 7x31-1 wwku ing, through the air (air friction is present), to the ground below. How does the kinetic eu-w3wx2 k1j1k 7v xizxnergy (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 diowurs;x +mv:9sj7o;i stance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the +sm 9:wo u7sioxvr;j; 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 potlio) .iz0xk6b52o 0 sli6j5l v(xubftential energy. Do not ignore air resistance. How much kinetic energy di00(bb. lxliif 6jz65 o5u2tsi)k ovlxd 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 enkan 3 i,*1vh hwut+rk:.ruu9jergy.

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 isrcc pq ib6 5- y+ e(y z8.8,lxibghmi7c,y1dao

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 expud;ajb cew*8f 0ej2 t;xc23l:tbakno4e )g. bressed 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 - q gxj1h90uyla 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,i2w* r wx;med, you did 3 times the work in one-third the time. To do so, your power out *w,; mx2idrewput 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 accele+llw-3vh*v e3acjr5 c ration, 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 ver 4pnfkp0ro95r+qb jl:ma+7jk tically 2.0 m and held there. If the object weighs 90 N, how much work was do+5 mf0akrjq7r:jp 4o bn +lpk9ne 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 ui zc:qmi10,ynfxm j18p in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of thi0 x,z: cmqn1fjyi m81e 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 puuq-b;n3 xa9 kqlled upward with a constant force of 5500 N for a distance of 50.0 m. Wha3;xqu9k - bnqat 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 pulli4mo ssh6-4oe ed upward with a constant force of 5500 N for a distanc44ioo -m hsse6e of 50.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for wof./gqhxrf2y-n( n *t7h, uncb2t f- a distancnohf .fwytu7h f- gb/, (n2xct*q-2 rne of 50.0 m. What is 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 up aot z6v :0 0nyexd+1 kpwq-7pnslong 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, inclined 1,--s )j9ajq+myxcl8 h wrk duat $30^{\circ}$ 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 sleu5zu1- qujrgaj(yu 94 *5iozod on an icy surface (assume no friction), with a force of 60-1u*95q yuu(j4rui oja o 5zzg.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig.ziwb:1;k*dy, pg, 6v dblqhb7 6-1 shows the force ver1b,zkv* ygbwd6qib d ,p:l;7hsus 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. 6-1 :7v,)e(xhyug(xy sdvq42 j ab shows the force versus the object's position. (q4b2yx v j eguays(,)xvd: 7h 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 i4n;phv 5av)s(u gt+dan the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh uad4g5 s()vnah+;vt pen 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 2woy/ z/hadl b .u+ 83*arcle0ss)wjs in the direction of the force. The graph in Fig. 6-1 sho)ya/le. *3su /jb zcs8ha+ wds20wrlows the force 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 move a 55-kg cart (initially at rest)b rpo:ygs,; n- across a 10 m level surfa:- rbsongyp ,;ce. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart2p;g)g5138ayf e x4e pxp:jdhr d+yv b (initially at rest) across a 10 m level surface. What is the finagpy)ra:2y g d+pfe;5d4 1jxbv e 38xphl 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 7k snxi,jy8n-5.0 m/s. How much work is required to stn7n ik, 8-sxjyop 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 25 m/s, what distance is dzd:7oipo 8vzwd.+lgyzka7,7i b. t r)l-fw3 required to stop a car moving at 50 m/s under the same condt d ivgwoidafl 7w-b .,:zoy plz)+d37kr8 .z7ition?

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 cocp s1nib5f1l y1ked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun pyls f511in1b, 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 oe g4-l8 yzg9h )se.mlkf 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. What is the cart's final kinetie9 l 4my.zhse)-gl8gkc 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 bcb /j)cse*zk* ale of hay, striking the hay wic/zc bje*s*) kth a velocity of 60 m/s. It penetrates 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 cy(s hk2y (jn6of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravita(y2 h6yc(s kjntional potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m longk7gi-pr *iumz 5av07 v and rises 2.0 m. If the planek-zm v05 i7*gi rauvp7 is frictionless, 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 spring6bv9afi /w y(a, causes the spring to stretch 2.0 cm. What is the spring constant?/fiwy9aa6 b(v

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 :.rtzvvxgj m;9c8x9r j -vg2lb3wl, fa spring constant of 60 N/m. How much potential energy does it store, when stretche;v t8 b 93 9j:zrxfj.vl2-lvwxgmg,crd 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 initpx*( gf 8s.l)) zb75hrk4d nmkn z7g6ejts k-sially uncompressed spring with a spring c5 k4pmz)6sf sljtdn.*()xzhg7sr 8 kbegkn7 -onstant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring cons8,.+ /5y xnjaesry1 orqxgl -ltant 40 N/m from x = 0.20 m to 0.25 m? (Assuyrsx l 5 ne/y1rx,jo-a qg8+l.me the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially comprpjakzny2bmos ::dyw1goix03d x/v, a*s(j3 5essed by 3.0 cm. How much w*vs: wj/xs o,my ink pgx31ayb 0(32a5djo:d zork 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 50-m high slope. Whac0t0.o5izpf uc /a p+is 0:fvzt is the speed o c0+.vf :z/05piz0 icpf oastuf the skier on reaching the bottom of the slope? (neglect friction)

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, pushes off the top of a hill with anu*, ey gpw3.hreewn )fmi,h (8 initial speed of 4.0 m/s. 3rwfhwem,h .(ieg n 8),pu*eyNeglecting 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 frictionless inclined plane. At the bottom, it has a 19l:k.e5 jvomf+mq1 nqv*hbkspeed of 9.80 m/s. What is the vertical height of+ m1qk 5ko*n efbmv.9lh1qv: j 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 floor. When it is 0.70 m above the floor, its po8e:gk in8uhk (tential energy exactly equals its kinetic energy. How fast is it movingku8e hg:i 8k(n?

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 ground6/3zhzfk w- rywkq7;m level with a kinetic energy of 40 J. At the exact top oz3hm7kzr6f-q/ y w ;kwf 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. A 7:eg4d bh q2q/2klmsmt the highest point in its trajectory, its kinetic energk7bh/: 4dlq q2smem2gy 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 reigxb1v( 69gh ist 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 thei6bhi9 (1xggv 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. 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 muyc fhl-7 zo6ax(s)2dk :u gpt(s8wi 9/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 thgfkdwt((p8oczxs9ly2ui-6 ) u:7sha e next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a speea b0nq- jm4l2-cdfa ix6ll -8sd of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top mx-4a0 clll6f2-is -ajqbn8d 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 * ;k32e.rg.y; 55v1xwva v rlvw tcykmri*ua5swing (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 ish-g ipq931vbc84rj7 ne:wm p y pulled 0.24 m away from the vertical axis and released from rest. What will be its speed at the bottom of its sw1jiq g3-7bny hv p8ewmrpc9:4ing?

A. 0.329 m/s

B. 0.877 m/s

C. 1.316 m/s

D. 1.097 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 ul7 t6 h-j(mvpyh1hf,b. yqlg;tq+r *rncompressed horizontal spring wi6h(*vlhrq g f+1-l.m,y rth;7jy bpqt th spring 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 2000 kg car to stop for 6 n t)jg5ebu5((ttgau iq 3nw9a red light. What workubgqtw n(et j5)au9ng6 5t3(i 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 objectcp 0sk.)y:sbe and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, wha.kcy: s)es 0bpt 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, jd,q bw/m umhs uq;3e3l.q67klevel surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How f;jm u,. 3h7 mbuq6skdq3q/l ewar 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 hoq z-b 3xgafjo*0e/rr 5rizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a fj/a-e3qgx rrb*z50o 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 500 ))xo+yg5gmi69(5+ufvnzageljox d -m high slope. If the work done by friction is vgojlxm6y d+e)95(i n5g)a f+g 0uzox$-6.0 \times 10^{3} \; J$, 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 is 4.0 m long and ri rlhg ftg(yi f98r6 )+8wmkl-kses 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 fricti)m tr-gflwhyi+ ( r9g8lf68kkon 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 pl ,7 zmum :d0/ fenei6z,5fcbawane inclined at 20e above horizontal. The coefficient of kinetic friction between t5m e,cff7:md,nez6zaw iub / 0he 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 dropp+3luv,o )cwrhed from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What averao3u+wrc ),vlhge force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of stairs9fi u c:idr902jiut8 b 10.0-m high, in 9i2 b809:cd ijiurutf
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 fw mh6prw 7-z b6gf2b4a constant velocity of 5.0 m/s. What power must be d- grzm6 2 6bpbfw74wfhelivered 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 energz(y;za qe0 e.xy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 74 qaey0.z x(z;e6 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 r5ss-8r.jrci0p*rnq 1 j8j y 6qr9sshdate of 500 W while riding. How much force does her foot push with when she is tra j-sjq81h598*pcsji.6rs rqdn0 ys r rveling 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 gst7 sg pcbo;vs0h92ku; ia*(0 to 25 m/s in 7.0 s. What is the average power delivered by t*2g;k is0bt sov7;ghu(9cas phe engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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