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

1#

What is the correct uni kz gfg2*kq(v-t of 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 if t,d -4z ,okew. 49rshidz cut4ehere is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of work 0c.co8/ 9 bbr5yesfgr you doc/rby.eg850cfsb9 or

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 vertical-c .(bh ln maypg54wl/ly and is being held there. How much work is being.gc(llhm5pw y4n /a-b done in holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally xnx j;33f 7saj3s9vkfu 2 o;hjppn. k*forward at a constant velocity carrying a 10-N object, the amount of work you do*7a; nf 32kpj3spoxk f nv.j3;jux s9h 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 verticatu4m,a b8ad-)pumx1g lly 3.0 m then returned to its original position. If ut-x,8a bm d1 uamp4)gthe 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 on an object do work on ts*x c7ebn0(v xhe 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. Compevdrkm2kzpbd +k9q )g,c+0( /tta/a pare the sign of the work done by gravity whilet)d0vkak9,tagc pr ezdq+b +2/ m/p(k 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 position (F vs. x) graph, represet et,ltmwh2 )1nts,t m1htl2t) we

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 doya.i vo53b2mv ne by thiya m325.v ovbe force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then t ma5yg;x)g uzq: 6.p5-uhoqpjhe 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's992x8 s uqycyr 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 aqtzip t7+-ws7+585li rrfthln 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 o )r0 l)yxs83) cnv os-lzst 6vhqj+et.f the car. Which statement is true about the truck's kinetic energy compared l)+0ssq6.lov s)tjh cxv-yt nr)ez3 8to 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 gxeqx7gz0 / e,the mass of car K. The kinetic energy of car J, compared to car ,xg0 7 eqxgez/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 bacmo:9o;g psg8k/cs073no mdq uk with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy? o/q:c79; 0k8pg msusd3 mgoon

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 moving ;bzphb+sj ;wn 88 i+luycac 1/at a speed of 5 m/s. If both objects hp+/ncayil 8+h8zbc bs; 1juw ;ave 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-kg (d :)1 qer99vle0aey*bdeyuw mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to r0: wry(lve)dq9e1ueed y9*ab est. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic,l*6 k;6kavbc h3sn)yb and skid a certain distance on a straight, level road. If you had )6cnl bhyk*a3sb 6;kvbeen 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 elliptical orbit. Neglebruov2tmcb1u/n 60 +y)u z)kzcting any friction effects, what happens to th)k6z1 y+bcnbtu)v2umr u0zo/e 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 principleuzp :4+xa*(-wxfkl aa.

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 potentialbv (nl3+m/ u:w*o1tezi1lop v energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h kk y066j mhnm6)p utj-tsn7 j4above the ground. A second object with four times the mass of the first if released from the same 60p7h)jjn-nmtmj6s 6 yut 4kk 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 spring causes it to stretch 5.0 cm. Ijn gaid q5-y9 -pmq48df another 0.200-kg mass is added to the spring, the potential energy of-g ndjp9a5qi - 8dm4qy 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 energy of a sysz(-x8n tnan90 c. e3myuapj7p tem

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. .)2wfcv z1 3qpceg8x ng, ly0s Compare its kinetic energy K, to its potential energyyl),sz 0n8w1gefcgx.c vp q 32 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 of0vgd z+ l3 6v kgoi78o9m7uvsp 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 object are sliding with equal speeds alk8(zn(bhcd3j : + qucjong a level frictionless surface. They both slide up the same frictionless hill. Which rises to a grea:( qk (8jc+3cu hbdznjter 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 3dsx pvxanz;*qh7i .. fnjtjx -6m*r9$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservat blhdu8 m pk7:kyng d25:vz;.wk0d v1eive forces;le 7k2h0 d z8wkyk: mvgd1bv5pd u.:n.

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 buil2xfovf-8 c ; wg)1rjacding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the grou awfcr)co - gjxfv;182nd compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do j,qoy8wn9f w;not ignore air resistance. How much gravitational potential energy did the ball lo98,;fwwnjyq ose?

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 e.ep;c)3p oip :qv)lvag+0po u nergy. Do not ignore air resistance.up);qapvge +p ) ovp0o:l.ci3 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 b:q,i3irqy j -ym27-h2waf hs 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 isuqgorb.,r8ffqef30 l7s c :r;

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 powerk1t; yz-hak+v expressed 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, whiq99 y r:+jpql(g zrux;ch is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third qfet r2:7)t1xe* kut yr2 dth124+gnademe0ithe time. To do so, your power outxfn)2eth01i1yte r7r2 +et: a mgdd t*qk2u4eput 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 acceleration, the car's opnss8,hmsnc86h1 w au kx*(7engine 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 vertically 2.0 m and held there. If the object weighs 90 u8- qzrqzge(c*,) axd N, how much work was dod*uze),z8q aqcr(- g xne 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 1.0vb+m i *h18yyp m, at a constant velocity of 0.50 m/s. What is the work done by thy+8*pih v1 ybme 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 upwmp r+gs) ew qx)qo;2 gdj,fzta(8yw2/ard with a constant force of 5500 N for a distance of 50.0 m. What is the work done bjgq2w (r+); odp8)t /egsa2qxwy ,mfzy the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled ud9k bqqiiq7uw f./2 c.pward with a constant force of 5500 N for a distance of 50.0 m. What is the wo9 q.iqfqcu. 7i2k dbw/rk 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 upwar+;7d5c-bifj*j w siqu x.yrl)zza8 9 qd with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on tzb+* 98a q ;jyfu.scdzw)qj ri-5x7li he 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 u 4o3n7n75iw iejypalh 6tcu52 19 nlzop 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 y 3aabcy5 jy+ tc95r4q8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy h xi . y,m;n08s*vqnwd8qzi-isurface (assume no frict,i x.-z8nhimq8yvi n w*0qd;sion), 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 tkmeefc 6kwe+1 4.wbj( he direction of the force. The graph in Fig. 6-1 shows the forcck(1j w6 mef+b.ew4 eke versus 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 i1iyldyl :z44r m2vfo;n Fig. 6-1 shows the force versus the object's position. Findim:r44yll dv21yfo; z 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 tf: 8 dwdy 9(hb/5jntenhe direction of the force. The graph in Fig. 6-1 show8:5y /9dt e dh(wbfjnns the force versus the object'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 objz8;vx1pdoi slv51x/ mect in the direction of the force. The graph in Fig. 6-1 shows the force verso /pilvx58zxs;1m1v dus 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 --93 sph7 n,m,sujq;rtewkyo 55-kg cart (initially at rest) a 7sny-t3m,q,pus h-9w ekrj;ocross a 10 m level surface. 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 cartf5lfz 4o1 v3lg (initially at rest) across a 10 m level surface. What is the final speed of the c3fvg51f4 l olzart?

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 movinjgaxj4e7 + z4ov9*i wng with a speed of 5.0 m/s. How much work is required to stop+94*xnai ovjgj4w7ez 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,t io(w6t9 vpu car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the 9ptow, vu6( tisame 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 exerty2oe9f5g6u y/qer wd 2ing a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligibeg5u ydoyfq 6w/2e2r 9le 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 compy9 ngcyay2b5 hl6 p8;yhb,,eronent of 60 N. The force is applied to a box whi 8ycy;, 5by b9h6gny rhla2,epch 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 kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, ;)v5)8z9dzmd gc vfeysru-hj q :,y 8fstriking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. W5hdyfu qe,) 9 jd vm8z )gvcs:fy;r8z-hat 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 above a floor to a heiq3:z rw1hc6 .h1eriwbz//) f7ih7qr xxt3dqh ght of 13.0 m above the floor.)i c 1wfqhqr6bdt h7h rix/w. qer3/:73 zxz1h What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclinr-yy: e og3,fzed plane. The plane is 4.0 m long and rises 2.0 me 3ozr-y :,ygf. If the plane 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 spring, cdp *3 2/f+ayd03dobndtril9 o auses the spring to stretch 2.0 cm. What is the spring constant+d0li a ndy 3d2*93/dtpoorfb ?

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 charactef;b y)q.v mc :8k(0qtkumvym, rized by a spring constant of 60 N/m. How much potential energy does it store, when stretched byk: m,.m(v btfm c8;kyyqu0)vq 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 2, h0;kl eu/m r*w j6szdigw8tan initially uncompressed spring with a spring constant ofk8w0 zwjte2s* ,glmdiu6; /r h 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 constokp ur8:d(;z6xt q .2fk o2mn :vnsvm0ant 40 N/m from x = 0.20 m to 0.25 m? (pnkmm:(ovv6:2f2x;sr0n .o8 q ktdzuAssume 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 compressed by 3.0 cm.+; kiqr4 7;*cv*fo of.mtmo) qel k3it How much work is required to7);*.*ktfol3 vmo;efmq ok+iqr 4ic t 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 ht z nf2p;vq3ezsd o.,1igh slope. What is the speed of the slier on reaching the v;es2 3,qnzf1.ozdtp 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 kg, pushes off th2z)s (/knaajj k;k6f /ol6 aime top of a hill with an initial speed of 4.0 m/s. Nsnfkjz 2l)ka;o6 / 6/aaimj k(eglecting 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 bqsnv ;4n4l 75z6wklsi ottom, it has a speed of 9.80 m/s. What is the vertical heighw45ll 4insq6 ns;7zkv t of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When ith2 .duzyn. 9lk is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it movin2u k ylz.d9nh.g?

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, blast ot ;;psqn+gkwf mas n,e8,*qi0.mi: bs straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanic smo*e,an wbq.i;nf: t,0;8k+qsg mip al 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 tz a;p,i.u s+kjhe ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what v+,sp. ajk i;uzertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the botto3prl;j r5tvm ;m 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, whir5;3 p;v mjlrtch 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 vkxk341kx8 40hnfcyk) r4uj.lzb-qp point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed u -0p3yl 4z1 vkhrbkx)4q .cj8fn kx4kof 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 ku xhpxiz5j j08+k6 x/1qlrj:above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed1j+: jkkhjpqxxr60zi u8 l x/5 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 sp3m) suzy2 6)h i+r,vtzp4y dtjeed of the ball at the bottom of its swing (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 pulluf)3swc/1 ozg vcg2w* ed 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of iw/w 32 1*cfcsv ugzog)ts swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal spring y/; df7o,wze rwith spring constawer;d7, zofy /nt 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 k-.gme7 t5s+p ulamb7sg car to stop for a red light. What work is done by the friction for-7 mtpm bgu sl.7+as5ece against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surfat )jc/vzgp2 b0ce is 50.0 N. If the initial speed of thet/c2g vbpjz)0 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.;+ fh e( ggx6fympy4t9 It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will +(4; ggfyemtfh6pyx 9it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level+9 :mfo(.tvt vrk uw;p surface. The coefficietw(uom v.kf ;+9tprv:nt of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in 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 50-m -89qi wly-v5oju0j rkhigh slope. If the work d8-o5 yr 0 i-jjq9wvuklone by friction 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 planazd6ssx * gjv(/x :dm:e. 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. s*d/j(zsx6g:m x:ad v What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the topl)4cyziu1 aqxql 1+ ,kx d00rg of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed o40 x0g yqkllrc1 1i,qazud)x+f 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 strikes the grou(mygl.2. bscu7xnt(;hpm* hind with a velocity of 7.00 mmnb hp.st2 .hm ui*l(( c7y;xg/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when ), ma6d1 nie:a; bpgqohe runs up a flight of stairs 10.0-m gpa;,q1 o)ed b:nai6m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. hgy ,x/ja4 138u:m a/(jdvffa7wlw4v7d apb c What power 7vdxw4f1u7/ d/wlf 8hcapa j4(3m jv,ga :ybamust 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 a 1.0 hp motor that runs for 1.0 hr? (1 hp+udtm:f9,tp z5 bl a4q =u5tzbp 9+ lf4 qmtd:a, 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 rate6d is63nbwmznt(: u*m of 500 W while riding. How much force does her foot p3(tw6m mdun*n :is z6bush 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 kgx6 )cd+jj +win 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W6 +dj)wjk+ cxg)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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