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

1#

What is the correct unit of work expressed in p p+urp -.l.he;u h6sg mm94h/vn(tumSI 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 nos p+(s19wyi lp 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 nlx9ff2ro c2b(, 0jgx fxi+x5of work you d( l g59fx20,cbfxfj n2xi+ro xo

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How much wor)lu tlib ej17*k is being done *7ieutlj bl1)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 forward at*:;z(mm fahno c3y iu6 a constant velocity carrying a 10-N object, the amount of work youaof y(uic mz*:h3n;6m 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 t4d .9 u :vigr.q ul10yypgocp2o its original position. If the total weight is 30 N, how much wo:updv. 2poygc r4i9gu1 q0.y lrk 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 40wp wjd +;bdq/am c5macting 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 worxl w83udjy 5.ck done by gravity while the ball goes up with the sign of the work done by gravity while it goes lx.3j duycw85 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) xly u4sdsrf ty95+8i,dzeu +p* 4 ga0hgraph, representsda+u54y ,+*zxp irf0l49eds sy 8u hgt

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 nn-7/xq y0v2p oof.ej represents the work done by the for2nvxo epfn7 j./- o0qyce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's ffh 4 3 -ejau0k;( ppxgwwmljn 9z7w::;-okykkinetic 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 yo 5c81z2mw4hu huf8tobject is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an obq,dfc d1q;i6q:12ds fl dam9mject 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 3,w(tflgkaoa(5 od3 2rhit4m car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared t3ot w3r,ao4h(mkl(gt2 fia5do 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 hao bpr4czj- s; yt elc73h1ius:ki:z 28lf the mass of car K. The kinetic energy of c8 l2sic;jir 4- hk3:pz:st ecbyo1z7uar 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 itszx cort. nhqh 3z0z,4q 2hnou97r(lu1 original speed. What is then( 3,rh r4hht n20ox uolzc91u7 zz.qq 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 speed of 3 m/s and a pebble is moving at a speed of 5 tjpku1,x(f *gm/s. If both objects have the same kinetic energy, what is the ratio of the brickp(*gju,1 xftk's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with 6sw uwx8+ m/vispeed 4.0 m/s. Both objects encounter the same constant braking force, and are brought t8w u/v6sx w+mio rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a cerpk+7x3rt 3goxtain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the sampr 33gkxx7 t+oe 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 o(r2plg:evym fa3*-o z 7:bphd2 kzy8zh/2 etkrbits the Sun in an elliptical orbit. Neglecting any friction effectdl /v: bh m 8kp(ehazk:zftezo22p23y*-g 7yrs, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy pri:w k /ou2i* s3jd4ajonnciple.

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 tou u:s);qknp vo:/jl-xfp*v 7qk/og s2 have 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 height h above the ground. A second objecfr q g*rc)cylk*bq;(nl e,n29t with four times the mass of the first if released from the same height. The potential energy of the second object qlc(*k9* crf,;egly qn2br)ncompared 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 1qsshcu*k :6j1 u:y qfcauses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential enc h16 ujq*q:k 1fusys:ergy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical en14r t xrj,)gjjergy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to 3.x j t if95x 0oxqfaod-.)jptzh;9kuits potential ener a) j 9.3ipxqt9ho. j5xdkuffot-z0x;gy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving upi nh,y7 )jmtvl8d7e ;o 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 objectdi7h7n f0ox )f are sliding with equal speeds along a level frictionless surface. They both slide up the same frfndo7hi0x )7fictionless 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 kcd0m,v 7bnd8$m_{1}$ 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 ofb(rx4r 8- vmk0i) ebrc mechanical energy for conservative forces. 4 ikr0br-vbr)cxme (8

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 trrsxx l 1 j.3ldsj08x(md(r5hop of a building, through the air (air friction is present), trxj ls jdh.0x lrsrd3mx851 ((o the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the 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 yr4mt 8t8ik ;kof kinetic energy. Do not ignore air resistance. How much gravitational potential energy dir ktty k8m;48id the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of grao:f+6 qy0hk y3b0c tuzvitational potential energy. Do not 6uq0 hc3yobk z y+:t0fignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conskru gu o v3-l4px)y.y3ervation 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 isrw1f5j5p-l s fb 4otc4

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed io qrq7 ,fb :dno7p3if*n SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of p5wr sxh)2g wywb)a j10ower?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time. To do so,72*f sqp bws9bm69xar your power output mustpsmab7s bq*xw29 9rf6 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, the3q(ow e-b6e3cae,hp/py-jhom a3 c zt kr-c56 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 vertically 2.0 m and held there. If the objecmz ) am 6qfv8p8lra +/q li)xi(py87pvt weighs 90 N, how much work was dv7pmrimqq)a8 apxz( i)v+yl 8l8p 6f/ one 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 c j-xs4zvn *k7up in the air a distance of 1.0 m, at a constant velocity of 0x4j- sck zv7n*.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with uc+8ug1kl97jd9 rvv x a constant force of 5500 N for a distance u9dl 8gk u+x1jv9r cv7of 50.0 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 pulled upward with a constant force of 5500 N for ,v 0w: ki6g-u;vggwtya distance of 50.0 m. What is the work done by the weigky,w:gv6ugwi0tv;g - ht 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 a dis *:o mvw12qiexhfa 6/4ewe,optance of 50.0 m. What is the net workif:e6h 2,4qax1e/ vomowwep * 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 t9uu6qxbr 0w+n +h)hg 9omb3jalong 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 ray79hm imwte ,/mp, 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 sisxp xva. 6q 6o9 o0ed.hytu+0ister Sarah in a sled on an icy surface (assume no friction), with a force of 6 0.aqyip+uo9t6x6 vxose0d . h0.0 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 objeczqflh 7 6v)o*ct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obj7 *v6hl)fzo qcect 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 fort9bayptsuy- wf8s9+ li*b6z *ce. The graph in Fig. 6-1 shows the force versus the object's position. Find the 6l-bb8t*upzys9 sift*9 + way work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direxu/ ad x,y7*bgction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obu y/7xagd* b,xject 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 directk-; qulqg2 no vqf721tion of the force. The graph in Fig. 6-1 shong -2quf; qvtqo 7l21kws 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 nho+xpv(w24cbk 9.c 6; vdbll at rest) across a 10 m level s .cxnl4hb9(2;b vdklv6p c+ow urface. 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 applie-bd3l ukcdr ogg;7+at2d*;t2 ioc n:o d to move a 55-kg cart (initially at rest) across a 10 m level surface.* cro 2kdgd-7n cb+t;go3l:a i2ou ;dt 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.je u-(- 8,looj46fd mnllxel00 m/s. How much work is required to stop thl (l,-6djeoumfo8xn-ll e4j0e 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 stovmagca. b ;;g:p a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s undervgma bag;;.c : the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart.* rwavpux(ar.+ +wk(q It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the springw(+rkurvq axw+ *ap(. 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 com5x 5tkykg-+evponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless xv k+g5 tey-5kfloor. 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 horizontal7 2e61iafa*x /is(fluslba(nly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm ba6a f2a(iif ( 1nesxulsb*7 /lefore 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 7.00 m above a floor t5dq*5h2x ldkwo a height of 13.0 m above the floor. What is the change in gravitationalq *5 d25wklhdx 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 ui :z)ve jtp66fp an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much wo )e6:p vz6tifjrk 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 fdt 2gt4((2o5prurt5nbuh p3* ta4g i a spring, causes the spring to stretch 2.0 cm. What is the spring cpn24toftti(5 4 db u3(h2 5tggp*ruaronstant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How much u8 in-d rz1fqyc9n.( bpotential energy (bnf qz1ud9-cin.ry 8does it store, when stretched 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 dv.xiz77 n 30d30w1rxtowa kkan initially uncompressed spring with a dzk. ak00n vw73wdr731x otxispring 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 stretchuy( b) cqko21c a spring of spring constant 40 N/m from x = 0.20 m to 0.25kycb 1 )(oucq2 m? (Assume 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 compresseds*,d rjazy,b: by 3.0 cm. How much work is required to compress the spring an addir, b*y,zja:sd tional 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-rxj4,kzx y5w .x5h++qmg9sy; oot 2djm high slope. What is the speed of the skier on reaching the bottom of the jdy, ho + ;559osyxtrzk 2xmgw4q+j. xslope? (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, puly q:oom8n; p+shes off the top of a hill with an initial speed of 4.o8p:y+;ln qmo 0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At the bottom, it hengk w))6u0 kq+pkg(has a speed of 9.80 m/s. What is the vertical heighwgghu)k0(6 np+) qekk 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 thoz(,+wrjr mv: xn0c m;e floor. When it is 0.70 m above the floor, its potential energy exactly em mwoczvxn,r+( 0;r j:quals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, bla1i7uua79;fhsw d g3 sjsts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its u7js7;93 ha1wgdfi us 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 kcgg; e ; wa2e(yw8h4yenergy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. 8;;ywykg(a w2g 4ee chTo what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bd1p lg -dsl5-0f1um;lf)dp lpottom of a dip (See Fig. 6-2). Neglect fric5up p)1 f1;ll fp0g dsdd-lml-tion, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

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 abovw e1l 9/bsijy/e 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 9/el jy1/biw sslope, 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 uyc 5g8 e3-skz+bs2qd5 4ljf ka dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whi2k58bjg 5zsqyd3 +lu -4kscfe ch 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 oez):z o 3a yg95bravip3.i5ltf 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 2-kg pendulum of length 50 cm is pulled 0.10 m away from the vertical axis and1 mraegr*3h +g+, a9axg et 6usksvn.) r xt)r.a gu*ns hgak+6mar,e1g3+9sve eleased from rest. What will be its speed at the bottom of its swing?

A. 0.1335 m/s

B. 0.356 m/s

C. 0.534 m/s

D. 0.445 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 initiall3 f t2z31/aac q6wvk.f)xbor pf;s eb)y uncompressed horizontal spring wi62 .fqs3fzxb ;w3)coakbfr1p) /vta eth 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 a/4;c-vqdexdr ).gtw xt 22 m/s, slows down her 2000 kg car to stop for a red light. x.q;d-xvct 4rw gd)/eWhat work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-l;4dv b 9.vu gs*sgs8u7c,vegkg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a e*ugs ss9v4v8; ggv7,l cbu. dstop?

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 mov-mu egt3 xwq l1l;m:i/ing on a rough, level surface. It has 24 J of kinetic energy. The friction force on it ilq1/ux ;im gl-etm3:ws a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg manjl,o0lu:z 9 n6ekmn* ss on a level surface. The coefficient of kinetic friction betwl9jm, n*o 0uek:n6nlz een 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 high slope. If truz a.tvt ;2nsd*z*qt6y4o-4 opj rk8 he work done by dyz2q;vttzr 4r.-*aktpos6 o u nj 48*friction is $-6.0 \times 10^{3} \; J$, 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 longzd+ sk1n) taz :3*fczz qe06se+ncb 5g and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the bo0czez+q) agsc+13* 6nnksft d ebz: z5x?

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 restj*nriy4up (g *:meaz- at the top 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 rzmn*4(ug ya:i *jp-e 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, fln2 l,h2 hcnx2ykm/mw)a* 6p and strikes the ground with a velocity of 7.00 m/s. What average force of air f n6*,2fw hylkph2 m)n2 lmaxc/riction 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-y t+tu 3m cd1opesnzz;-1d 4h8kg boy using energy when he runs up a flight of stairs 10.0-m hz-;e ysn1o4c d1u 3tdz8hp mt+igh, 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. Wghe8j :yw2b 4in1c/r4rog zv:hat power must be delivered to the objegh/: 8z:1gr4rywon i 4bcvj2ect 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 enei -5xv7ux6hin rgy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp =x7 -hx6i5vun i 746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while8ol gy sny4c6( riding. How much force does her foot push with when she is traveling n(olycsy 64 g8at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. yr1s 8v lg7/yh 6tfd3r What is the average power delivered by the engine?y dfg8 t63sl1v r/r7hy (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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