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

1#

What is the correct unit of work expressed in Sff/)mv a/mq+- ukpye6 I 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 5k5*fogcrw d5 h,y(ilno 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 g pbwu0; bcj,1npn; tb:1v s 1goq3eh-brick wall, the amount of work you duvcq0; :gjwbo nst;3n h- geb1b,p11po

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 lifkz n/zn8.,.k 7yvof.: ;e2xbpgxa itlted 2.0 m vertically and is being held there. How much work is bf z/z;v 82eit. l n.n 7ogbyk,xk.ax:peing 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 vel; tp qshoca0jw)u- r)*ocity carrying a 10-N object, the amount of sath0uj)*-qr)p co ; wwork you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then retu4sl xnd5q i6 ehpv1r)*rned to its original position. If the total weight is 30 N, how much work was d1l nxsp )6r* hd5evi4qone?

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 the obje50vy s0ixg/ ;7ooevr( a zqw(qct?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravity whagpqf1- 8 -9(t mxpxrkile the ball goes up with the sign of the work done by gravi(1 --papq9mxrgkt8xf ty 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 v7zt u:ay.rc 1cersus position (F vs. x) graph, representszu7t:cac 1r .y

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 vsy01v4em gsnn 2wl 9 ff;( vzrv4flx7*v. x), what represents the work done by the forcerm e1n;v4 4*(wx2l vn7fvg9sf0zyl vf 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 kinetic en h1rth+j -1hh4; y6njqk (sehfergy

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 2rer10w. qwaxobject 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 doneeymnw*a.n9vk 1 dw ucepiq:a f/::3:u on an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speek4q 1rxk/wj5 pd of the car. Which statement is true about the truck's kinetic energy compared to 1w/p45 qx krkjthat 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 fashvrak* x gj694t as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is*a h v4jgk69xr

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 wjhi-yttj ;,7l j jw1y0ith half of its original speed. What is the ratio t yijw0jyj, tl1h7-j; 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 dl oj8ui(9tu3/d 1-az xb1tvh 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 ratio ovz(at-uh1l/9d it3 b1ju xod8 f 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 movi:z0rsr x2.z keng with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance befrex:srzkz20. ore 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 ;.gs/hn 20o6ssau/el gncro ,skid a certain distance on a straight, level road. If you had been traveling twice as fr2u.g/,cnasoselo /g s6h 0n; ast, 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. y /vd-a7sh c)y Neglecting any friction effects, what /h)vs7 cay-dy 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 princivuvix(a s2:o 8i-a1 s4xq,d ample.

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 nega5acqc a (i5qv b,am-o+8twt7ative 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 grounc5i 1 ynj4j hll1b1/v9uhho7ownr 4r:d. A second object with four times the mass of the first if released from the same height. The potential enero 1 loyhjvj75nn:i11c hhbu/rr94wl4gy 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 ( rf2vsij kwjs t2d .mxj-1+wz)g0h;ncauses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy oft0mjd2iwv.f nsw+hr 12kjs -g(;xj) z 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 a3s0dppmjaa8h7 +e8 sec2e7tn 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 its potential enenng hj0+q82 dmrg hd j0gq+82nmny 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 own :l)wu*2.mod ga 0eif 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 ve ,ja9 ongozf3usf dpn;h6u,l.2pty r0 sec62 :ry heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same friction0:afsuel6t 9yc sn2.dop3n;jo2 zp h,u r6,f gless 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 36ngzpg ) 3i7wt ue:lu$m_{1}$ 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 cc aogdd6+tc+qasu 4p- ur+.hfh*: g( of mechanical energy for conservative forces.pu dfo(+adgta+.cr*c4- chsqhu : +6g

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 the air (air friction io o4jldl740pp* h 8kxos present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at jkhdo4 p0 llx8opo47* 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 nod8m vx4pz0*rs dx-xjsq 5u;u+g9 hp3gt ignore air resistance. How much h5ds m xx8uq*0jp- ;x9zrgudsg 34p v+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 oudgf w++v lhu8: 61(f g6xvuhvxkn )/of gravitational potential energy. Do not ignore air resistance. How muwd nvu u6o/f(6+hfglx+)uv8:g hvkx 1 ch 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 energy.d vcs i:jz5,o, b:jc5r

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 iscoir o ,nq7 (4e;zgwd;

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 expro7i2h*i yk:pkgtvw-lt3*u2 4iz d;m qpyk y4;essed 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 u2seyku j/ny;g 5l;i(ohe ,e, 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, yo8/-amu .lh 0gxga/q.xckoi j1u did 3 times the work in one-third the time. To do so, your power -x mcj.uo/a qgil.08xh /kag 1output 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 engine muxb.y lr (y jy7*pcui3y 0kt+d9st

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 obj2 79afxtcgur ul9 4g5gect weighs 90 N, howtr74guca f9 l25x 9gug much work was 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 ;i aw:r+uekbt: urt1.u j :pr;up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the wow r;k:1u:u+t e;i.prrbaj : turk 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 pullpjidv9 4t1-hj5- ffjyed upward with a constant force of 5500 N for a distance of 50.0 m. What is the work donep1 ji-h4-5 9d fjfyvtj 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 for6 pawhfen)qvq4408ep ce of 5500 N for a distance of 50.0 m. What is the work f4wq p4 n8pv6)aq e0hedone by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward w)v2 qyg5z*zwwith a constant force of 5500 N for a distance of 5z) v5y zww*gq20.0 m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6k 6crijtq(ox; ,-x n:g.0 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 ramp, inclined at x iq t)g (6:d2g,5ih wkjfzla;$30^{\circ}$ 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 surfnuz);j(cc0 a dace (assume no friction), with cza dc0n );(jua force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graphwgkbo7c 4rf4 :2au 6sc in Fig. 6-1 shows the force versus the object's pos4borcwa64s fc:2 k7guition. 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. kg gn2es(0;q0b8elj n The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obj0gnn;kqjs 8g (02e belect 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 gramqmakf5;v7k*u9 h x 97kd y,kkz*aws:ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objeavwqmkk 75, k9s; z7mkk h9uxyd**f:act 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 graph in Fcs/d)0hvdgkv w(cq3 1ig. 6-1 shows the force versus the object's position. w1dh v/gds0(c)3cvq kFind 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 55d5mwi6nhgu :xy 71-to -kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energgd7u:w-mn oh156x ytiy 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 cart ccl11 dnbuhp..(1ulk i5j*v o(initially at rest) across a 10 m level surface. What is the final speed of the c .lupcjnlhck(1uo15i b1 *.vd art?

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 5.0 m/s. How much work 848sj6tyzg pw*cudl ;sq)uz j24ktmq0 l5v c;is required to stop the mass z5tgtq;svzp2)*0u wcl4qk j 8 c 6dyu8s;lj4m?

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 ini ;44das klm(n cc4tu) p+1xnjltially moving at 25 m/s, what distance is required to stop 4 (l44ncu la;+nspmcjdt1 kx)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 10-g dart. It is cocked by exerting a f,*:r rp8c;k)fvwnuevr -c+auorce of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuv u)8;percavr: ru *-+,kfn cwming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component of 6- ip;jrrybj3za 5z4l20 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and m yzr2-lip3rj;j5b4zaoves 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 shotcnc 7htx 0kn+sabfqs6(hvu kx*4 t2* 7 horizontally into a bale of hay, striking the hay with a velocikh b*u 0n s*76fx(hqa xc47ks+vn2cttty of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of h -tvz5 9 yj6odaw-8uots-,- u vt2ipy7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential energy?z-vuyi5- o8-p- h9y2twjuad t,v6st o

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m log3*r 5vl feqr9ng and rises 2.0 m. If the plane is frictionless, how much work was done by the p5l3 egrf*rq v9ush?

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, causest rxbfagest;ss.uz a e--lb,w;- (*;f the spring to stretch 2.0 cm. What is the spring constant bstswtxfu--gs*r-afe;l. zbae(;,;?

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 potentv3dp- mxl;8gw ial energy does it store, w x;-3dg wpl8mvhen 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 an initially uncompressed spring with a q/b:tf-f g 8e ah;paz;og 47 5 ymlp4hzh3zi,dspring constant of zobg34ph aff; /47al y5hz-pmt 8idgeh q: ,;z25 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 stretchzcrfoaryb69 -p1b6 14 lvvzd1 a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at o1ybr1fc z arpz- b9d46vv6l1x = 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. Hoo49eykc hu :.1slil5 qvoo) :gogdjea2 zm1 .(ws :2ocg gl91u:z.q1yaek.oh4ljo i 5d)mv o(e much work is required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope;jnms 9-zppuri-;a*n . What is the speed of the skier on reaching the bottom of the slope? n-mr;pp u;9z s*ani-j(neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of l8kp2e)nq ,qp a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 mq pq,ln28 )epk 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 fricts956a1 gvcbcaxkd0c.ionless inclined plane. At the bottom, it has a speed of 9.819c 0casb xdcg.a65kv0 m/s. What 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. y)3ikz +evn87g/y 7qm8ah2 jpmwcna+ When it is 0.70 m above the floor, its potential energy exactly equals ite)yc2j i+n3v qn8h8w7az7/m m +kypgas 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 fromn z glh9jn,umsjz gc;a0d: bv27) ur+) ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height doesngdz;rvj0 u )bj)gzan9 lc+u:,smh72 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. 1qzcj )8rqj(+sd 0i- p qwa-bfAt the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, rei (wqrqs+-)cbjzpd 01qf-aj 8 lative 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 point5f 1yin.+jym k 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollerfk 1y.jmin+ 5y 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 aiaf *5zbf/ ccy/vib :xm +4d,at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be thei avxf +m/:,icf/bz54c *bady 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. 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 tishr8n;hrrj4 lcg ed.fvj o-,1 qn,,ze2s 52 30 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 theci8 21s;ho-vqd., neetrs2gn4 zh,r5j,fl jr next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at oko.(f s50h0 iuvk b+ug-gr q.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 0.17 m away from+rw: lpg40o4ygl. zd6i dd2(krylx+k the vertical axis and released from rest. What will gl.(k yglkdlid+2 w4+ry4 r :p0xdo6zbe its speed at the bottom of its swing?

A. 0.229 m/s

B. 0.611 m/s

C. 0.917 m/s

D. 0.764 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 uncompressesfo+ ;tb6xb)l d horizontal spring with spring constan )f bl+tbo6x;st of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red lig8u 9wd,ucvp .dk9kx 7cht. What work is done by the friction force againw v9p kdk, 8uxc.79udcst 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 horizontalgodutp3q1+i / surface is 50.0 gopt1uq +d3/iN. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J of kinetic ek f47kqt onq ;zc*t7pxl ,nkm*(-r sf0nergy. The friction force on it is a constant 0.50 N.,x*n(*0 tq7l;scnk47 - t r kpkfmoqzf 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 hyag53*y s-q fgorizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its ki*y3g qsyf a5-gnetic 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. zfct+v ;54 r.br6q4 yqfvba9rIf the work done bc6v5+ab .f frrbzt4y;rq q94vy 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 :bnu(,lv i)x aup an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J ol: bx)(a nuv,if work to get the box to the top of the plane. 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 resv 7,wyi( 5p;kif ;v2u6yiqbrwt at the top of a plane inclined at 20e above horizontal. The coefficient i6 wwkpuq ;2(y ,75iirbvyfv; 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 from a height of 10.0 m, and strikes the ground .4giqxbr of)2v2p+hinz+roz n0n0 -gwith a velocity of 7.00 m/s. What average force o .br +2vnx+i40rgzio0 nhn)-q2f pgo zf air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight ob 3nroh+ u6eu9qcz23 wf stairs 10.0-qu6hr3e2 uwn3 +9ozcb m 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 needea.(wrwz:6zw3a z :wzkdwhdf 0iu6m 55d to move an object with a constant velocity of 5.0 m/s. What power awif:dzzw h65u z(kwz w.d56wa3mr:0must 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 hrds- *o)n uz4tmfk;u) l? (1 hp = 74d-l)k4 u; )fusoz*mtn 6 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 whilex;sww4/b+xfk 1qsy 9 j riding. How much force does her foot push with ws9s4 y+qbfkj/w; xw1x hen she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average0huxh n*e fo 42c/rm/p power delivered by the engine? (o* nefrh0hcx/ 24/ pum1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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