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

1#

What is the correct unit of work expres nl x dcsu1-5ob*ice95sed 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 there is no4f3jtde rtu2 0 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 wa.6 xs:(plzd*i2ufw v eex01k zll, the amount of work you f d1le*(u xzx0ep.k6zs: wiv2 do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and xpp;u / nma+b,/dbde+ is being held there. How much wor;, +xn+b bd/pmpaeu/dk is being 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 forward at a constant veloci:v p y/2u4xmwiv4g h:fty carrying a 10-N object, tp vughw:2fi4mvy: /x 4he amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vw-ymh)e5 rxd0 ertically 3.0 m then returned to its original position. If the total weight is 30 N, how muce y0)- 5xrdhwmh 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 ; tqry.xen x25j ;6tblobject 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 b9yc g;*qvrp:nhw/unu c3h d /+y gravity while the ball goes up with the sign of the :vhr/c uhd3 /pyqnnw9*+cg ;u 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, oxg2w 6ot/lw0ebn8 k u2+1kurjn a Force versus position (F vs. x) graph, representsx0 u twl28ek1jg26br nouk+w /

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 7g3 mf,pp-idv position (F vs. x), what represents the work done by the force vpf,-m7dpg3i 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 o6 uiz3 3fx7ch4wbqv/o bject'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 t(0s3 9pnd87xeit v5q bzfeyx6he object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, thed.tdfh1g d r.fot s. nz)5*;.:wsjzs jn 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*qb 6:/xq+7seb ym)rjxzao 5e much as a car, and is moving at twice the speed of the car. Which statement is true about t )/ab5q* 7joseryeq6 z:xbx+ mhe 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 hmmt r4tu4-r6m as half the mass of car K. The kinetic -4m6 trmtm r4uenergy 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 spee4*j v p5ri3famedhbbxvt ,;-(d. What is the ratio of the final kinetic energy to the initial kinetich(xi,r m j-5bf*dvpt34va b;e 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 7(-lj oso 3pudp7 44wuqsgt2 qa speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the dlogsw77s putj (qu4 4 oq-23pratio 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 mass is moviqfyrbtt564r9;2k km/q/wj1actb nr(3 m2l wmng with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which obw krbtl2;k a1tbr(6q ytf2mnj59c/mq /mw34 rject 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 ca4lt 57s2y oydur in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same condition y7lsd4y5o2ut s?

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 y8w09tvmzv itp(p50m rbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy?pwyvv9t(5m00 mip t 8z

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 principle.+rq r)aqr*ue3

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 syst3 g5 pnalfxd3:em to 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 secw3w4apf250v3x odl/u19:g(4y c sclp wcbrfyond object with four times the mass of the first if released from the same height. The potential energy of the second object cosv0p5oadxcrc:(/cwbwlf3g lf44 p2ywy3 1u 9 mpared 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 t7a::l xlmx8 jto the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of thelm:l a j87t:xx 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 ssh1 xd,,vtd 7rbh 86mpystem

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its poa8bsm41e na p+tential energ8a+mn4basp 1 ey 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 jpvz mnw7l7 w ca ;4i.wrq; p1u*zw8u;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 xv08z 5f +lr/q8fm x bal1r4zralong 0r xbv1q f5zar+8/xfll4 mzr8a level frictionless surface. They 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 aii mw,0*i *:b1d luak$m_{1}$ 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 x*zes r., 7;fi.rxbii8nzd y 6conservation of mechanical energy for conservative forcesrizi.. 6e8f ;*xn xsd,7zyibr.

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through theu01o6i;tdl( q mekdzu++k 5belf5 j u6 air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground comparf+u1tlm+;5 k0 6ej5zkdu blouq id (e6e 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 disr)ywu nm(uq 6)tance and gains 30 J of kinetic energy. Do not ignore air resistance. Ho) r)yq(unw u6mw much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravij4/ cl.c yu:cqtational potential energy. Do noj/uqc: y.4cc lt ignore 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 conservati2hn 0; xx0d,j ab8uo 2cm 4heiszf6sv2on of energy.

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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 isv9kn ;4b4kfd z

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 m6 rx9m*bia(.zfs*c:v8y5okbam g- u in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of poweb 1vfuais7.je f9 fb;7r?

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 tim0cvl 4e0+v 09xos wmcwe. To do so, your power ocwlm +e 0v4ovswc90 x0utput 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 akekbtz 7b,5i6 t a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object wene .p9pxr-6ri ighs 90 N, how much work was err6. x-nipp9 done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant velpg+7 a b4f6tcm0n4f rlocity of 0.50 m/s. What is the work+apmf 7gr b 44tcn60lf 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 a constant force of 5.2txcw;t ufk7);limx 500 N for a distance of 50.ti mwl;tu.;f) xx7k2c0 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 2c u g+,s vpel)gh-ntz6o+12mrnr9 ma pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight ns t-9r,+z2ahl6 v c e)n+1ogm2rpmugof 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 x1gbk)l pzfg w)2 z7t75500 N for a distance of 50.0 m. What is thextlk)ggzp2z 7 f1)b w7 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.r+,3aue2gdgaow +wes0 70 *m xrlt6lgik4q m80 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ram1i )f.saz15unlvpqgb bp( 3 7vp, 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 Sq mk1y0arx 4,tbt,)f up;0vpnarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anglept0tn0x)vf,mbrup ,k4 ;q 1 ay 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 tmgyu 3i2(fe;rhe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesuy2;3ir (gfme 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 objecy8ukw .pz:rq+ px2 xo*t in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donex2x8zq. :pw+py orku* when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph i8az 2dx ;hlw9mn Fig. 6-1 shows the force versus the object's positioxlz ;8dhmw2 a9n. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grapho;adkeyqk.dw-1- t nvl0vv.m5d 5+st in Fig. 6-1 shows the force versus the object's position. Find the wod+;yq5.vtkdts dem 1wkvv ao l--05n.rk 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 200s1jng3feu*jk)- j ntk e:n)q7 N is applied to move a 55-kg cart (initially at rest) across a 10 mnqujk)173)enen*j js :-ftg k 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 moveh nakl 9n(c8lwnzk:6w( cqow1ktv* .. a 55-kg cart (initially at rest) across a 10 m level surface nk9 t( zkl6hlcw.8*1noqc(:nv waw.k. 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 movin;n iiqkpi0kn +7jg5lf 77*gdjg with a speed of 5.0 m/s. How much work is required to stop the madpg+5kjn7 7 knif 0 *j;qiigl7ss?

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 ilem9;er2g9lu-zv( d x s required;9lv2eur( zgxdlm9e - to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 1sj-xer(me4 b4 0-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligs ( 4m4xerb-ejible 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 gseij6x3jivgw e /;k(b i0s4kjt3: mf*s((nh horizontal component of 80 N and a vertical component of 60 mh 0: (ve3k*sgiienj6jsg(ik;4(/ 3fwbxtj sN. 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 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 i5r5wv5u w* .8rfrwxwus shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates u58.*xw5urwvr wwfr 5a 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 tg kpq3-a5;)yac)5 noc0oygb from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the chanab5yq3 05coy) ctgon;-)kp agge 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 u12pest)k*mgt9gb) sp 9ulbamqufd( +d /5k;x p an inclined plane. The plane is 4.0 m long and rises 2.0 m. Ik2( mub xfs+g95*;dk ))dlbust/e 9mp1ptqagf 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, causes the spring tv0v (vdnaq )tbjeft (ahi 9u+,u 8x02xo stretch 2.0 cm. What is the spring u+0v( a0nxi)2 fhvdvtxutq8 9, (ejba constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/grz dabh,ex;ul6q*;9m. How much potential energy does it store, when stretchl eu6* xa;qr; h9bz,gded 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 8 k; f)ph1ol1qfpw n vi8uc5.hto compress an initially uncompressed spring with a spring constant of p;hohcu)ffl5 8 18n vpi1k.wq25 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 springq5*b rpg:ah, zgw6b5 v of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unsthz q*6prv5 , :5bwaggbretched 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 consti+ew*)y na 8z f ,pm*4it5lsbvant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the sprinvp5*4 *e wfi8 n)miy,tzb+al sg 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 fr ecr5toncrlsrna8l + (h73 -0mom the top of a 50-m high slope. What is the speed of the slier on reachings0rt5m8lnra3cc r 7l+h-en o( the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 4 ;/,ogedj4dja+ b)e 0c/hiztm.0 m/s. Neglecting friction, how fast will she be moving after droppma ghj0d;/,) z+4 teedc/jboiing 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 plan;p 5j.+xwp i.y5 ol r.hxe4czae. At the bottom, it has a speed of 9.80 m/s. Whaowz4h;i eclp.. x5j.ry x p+5at is the vertical height 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 i4vi rm /s-vq q+n ww24 t9boavrdfyhs.-7a )v;t is 0.70 m above the floor, its potential .)vy sa9- qs4- 4h;v+nmb2 vwiwao d/rv7q ftrenergy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level with a u9 ,* zjmonc3ykinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energync,*u3yj 9omz 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/mr esciv69x5 . At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to itrcm /i5 69vxses 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 abovq4n8i dt4,c idwvtn(t1c3*y k5-q oki e the bottom of a dip (See Fig. 6-2). Neglect friction, whay-q5t1cn ( d4wi ,qo8kn *kicv4i3td tt 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 mbd,n s(d r2tsdnqvs*aw,)*wz. yx: 7 c/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m abovt72y, wawdsd) r , d(*s*vzcqbn.s:nx e 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 mqia:) z0 c09hoein/n/gkz r*m above the bottom of a 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, whi nizmr*hng9c/: z)kq/oai0 0ech 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 swa+fd 7 dnoofwl;l7 e*)ss-:lgb8aouw m/+mm ;ing (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 j1;3vh uz2k pi50 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed ;ih2k j1zuvp3 at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially- a-ag4ab rur g;30ryv uncompressed horizontal spring with s;br0agrg 3 --rvy4 aaupring 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 casrw.p 9 pst vn**bmup+ud--y9e a(5ckr to stop for a red light. What work is done by the fricprs *my p99-t*e.nbc(vwp -kasdu+ 5ution force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horzdl .cq217.*3fcfe s9rgch k fizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance willf1fdkcg 2ef h lz7 r*cq9sc..3 it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 (n ,s1nw3cnx *,k)+sox ztnfuJ of kinetic energy. The frnx1u(nkc+x,n,3t z)*snw of siction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surfaced-a;4he;xvsk-) zwga. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a dsa aw- k d)hx4v-ezg;;istance 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 ljq qc+;zns5lg (83h39ycbdi high slope. If the work done by frictionbzdq ncjc3i(sl5 ;h9qgy 38l + is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane dhj+/3mygbygnjg7a0 -mo feo)7w o13:bnv: y. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction7fm)o3go: ey:hwn g3 /dj 0go7y + ybaj-vnb1m 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 ataac7ne0 l6fht5 2e3jv+zazuii .i-g; the top of a plane inclined at 20e above horizontal. The c cajit ia aig60+n-2u5.3;hlz7zvfeeoefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped fr ahac2fa*x.0s om a height of 10.0 m, and strikes the ground with a vexa.f2ch sa*0a locity of 7.00 m/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 he runs u.qdnqc wo o8k1qu2b3p*7ij f3p a flight of stairs 10.0-m high, ind.jnubq37 wpc 2qi q*f k3o8o1
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 ibndcxyh8 :) .of 5.0 m/s. What power mustdx.bc:h )8ny i 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 j0s fmu j v26:2evt8asare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)8vf2jauste sm j60v:2

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 while riding. How much force does b *bhv08q),b wu)muxsuo;z s-her foot push with when she is traveling boqbzx,8umsu; s )u*0 - b)hwvat 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 o9 sg7ffptijs+8ep-1:ssc*ms. What is the average power delivered by the e:sjp7g tof sfps8 *i1+mc e-9sngine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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