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

1#

What is the correct unit of work exp;;xn lmf2q0d ulls8m.ressed 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 i cl,gn5zcp,vc7)mc 1wf there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amounqq2j5o ol:2 pdfgd7m; t of work yo5qo g22qd:j 7o;m ldfpu 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 is being held there. How muchh; wfh vn xu0va(yz9cut74827vzn8 aq;.brf c work is being done in holding 9208vfhhcvcxn7ybvwu( 84;r 7fz aut nz. ;qa 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 horq70q vu3aaqyspscadk5m r:0./ 43eqzizontally forward at a constant velocity carrying a 10-N object, the amount of work you do sad3p0q4aqk 70uqs.v: 5a q3emzcy/ris

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 udve nyvy4f)2-2 o)lu 3.0 m then returned to its original position. If the total weight is 30 N, ho voyu)2 )fveln24ud-yw much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on thecp;359 aya rkd object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravityc pwr j+st2g,u/q f37w while the ball goes up with the sign o+w2qt/g s3u,f rjcp7 wf the work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) grf.qdgqwx, ))kaph, represents,x.w))g kq dfq

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 posin fr(:c+rfgwv +d:)m vtion (F vs. x), what represents the work done by the )f r:gc(r+nfv+ mvw d:force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an objpho m vulfy9r76z76.ject is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done onu cdw n3feh;8: an object 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 object is zero, then the object's kinetic energws. snk7* o51 ii,wfk5 fqj;soy

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 ar ewxa25 +j3drs much as a car, and is moving at twice the speed of the car. Which statement i3xarjw52r d+es true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half thef ug3;j-i2qz( ql:jpv m23wpbkq:h8c mass of car K. The kinetic energy o hm;vq:bpu32 -jf cwp82:jgql3i kq(zf 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 orbiz4pw (mib,*app( bb(sw c5lk1;+aiiginal speed. What is the ratio of the final kinetic energ mia+4,5wipalk ( bpb spb1b ;(wizc*(y 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 mobe l3i4,z gp.yepm(t3ving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the legz3 ,(3.p4 beymitpratio 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 moving wiy-,ovhfe ) 9j 3o5ajvath speed 4.0 m/s. Bovhfjo,5-eo) a3 v9a jyth objects encounter the same constant braking force, and are brought to 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, jpay) jtm35 n:and skid a certain distance on a straight, level road. If you had been t5: jytpn ajm3)raveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the ;sy5m1w mo py-Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic ener-spmw yoy15; mgy?

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 prinp /y2ts lq9dsx/x6)p sciple.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potential energ i9mb28 t,fnah 6z(vkoy?

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 fr7zf no67t z+ooom rest a height h above the ground. A second object with four times the mass of the first if7f 7z6+ootnoz released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to t)7-ory;fz2 gsoqp*o 6qrxgl-he end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the springg o6g*p oy7; osrqrx2z)- -qlf, the potential energy 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 energy of*8ma(em. 3z;bg8h6+zf rv;lcd ws qa m 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 it o; 1qrz-.8+fh:jtflb ur0q)be 0q3mqf/iw ow s potential energy)1o.zb0rqef- m3jr :;+0fb/l hwiq oqw tuqf8 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 o *a;1d6 fakepavz6x ;vdy5u ,of a car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal d:y4m2 yj8 (pxukd d0sspeeds along a level frictionless surface. They both slide up the same fricti 8j0( dmpy: 4kxdyus2donless 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 zro0 c8p6; d *oc .8qd nskp.1bjztk69xmryu;$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mejvqig.b4wkg-i.f;3 ;mk c0 bbchanical energy for conservative forces. k0bbvwkbi.fmj.;-iggq c43;

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 frictions, fh8eve nd hz/p7r-p7qd;h7 is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) a-rh;zehe7sp8q ,7hdfd p7 /v nt 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 distancebzs a4 tfku o-j4x.)k(c/ hc0j and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potentialb kta4 04zj/. (hcokc-xs)u fj 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 gravitational potential energy. Dt r)5u7ekeem fq( .uxj*a3wa ,o not ignore air resistance. How much kinetic enjxtm)u37ee*a rwqa e ,f .(5ukergy 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 ene bde ol3dq2g4()*iw ebrgy.

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 isq3 ot .is(98eiiixyh3

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; d,m: p4 *ngrzot+3gwmmk:wn 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 uniiweoh94qbeqcn87w . o *;vx7 mt of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in onequsksc0tgb )pf: n.fq* -i)0rue mi 80-third the time. To do so, your power outpu) r:timi8scu0kfse )q0*-gf unqbp 0 .t 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 accen ugwy1*.q8 ve;w pxn1cxg t1-leration, 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 verticalp (klkc ;mf55xly 2.0 m and held there. If the object weighs 90 N, how much work was done i 55 x(;kmkclpfn 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 wn a5q5qg(q9(1 cky p8yov oy,of 1.0 m, at a constant velocity of 0.50 m/s. What is thog5y(c18(qv 9 n qwy 5okya,pqe 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 a constanti oj7 dzu3z)de: ze4c q2yk-pshe801f force of 5500 N for a distance of 50.0 m. What is the work done by the 55cyz1dequ izfek 4oezh-: s73d2 p)08j00 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 nl+m :g ,gd6j1ss2 omqpulled upward with a constant force of 5500 N for a distancjon s ls2d,g6+1m:mg qe of 50.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 yo(g nw:m(dpdxwu(*yb f2 . cl-edq 63N for a distance of 50.0 m(f(*ded3p.gdqlw(xc bn:m o2w-6y yu . What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along a :gc ,au1vce+ z$37^{\circ}$ 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:df32mnuigli -lxl:dp3 u6 p2 $30^{\circ}$ 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 surface (assumg0 (smx q/+ka85 8;ztn bxb;q.i knxgczj y:2re no friction), with a force of 60.0 N at an angle of ma.0qni+gb88x;z:x (xrqt;/k2zb jy5k gsnc $37^{\circ}$ 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 therxg /82m9gq .vezqm( l direction of the force. The graph in Fig. 6-1 shows the force versus the orle92mvg.zgx(/mq 8qbject's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object indoc5pl3t 7t c( the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the wor(7ocdtc 5l3t pk 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 direction of 6+)lcjsf . o ue5e4lh dxav,:vthe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when tv efv4so 5 ,6u +:.j)cldalxhehe 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 graph in Fig. 6- wm,vemezjx,1p r1y681 shows the force versus the object's position. Find the work done when the object moves from 0 t1 8mxeyer1z, w ,jmvp6o 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-k.lr7pdota a.m:*:7k 6 vewkreg cart (initially at rest) acra6.7e .v*l p wkrtode:am 7rk:oss a 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is appliedy(l1 2fy)qsrr to move a 55-kg cart (initially at rest) across a 10 m l (r)r y2yqsf1level surface. 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 5.0 m/s. How much g.hptp /n4mldi+ 46gr+ i* afoyb4wnv(z i7v8work is required to stop thi6n/ gap7l4vphw4 i8m(o.zf trdg4b+ yi + *nve mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at/1f -ixn(o llf)fvc.,eboa g( 25 m/s, what distance is required to stop a car mo agefl )o1ofvx(l,/-nc.ib( fving 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 cocke) ta+5 scl;aaewu:2a jd 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 negligible m uaajaeslt;:c+ a25 )wass?

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 vertic(c rpue 0+ihbn h-kg.;al component of 60 N. The force ip b( h.g;cer u0+hnk-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 is shot horizontally into a bale of hay, striking the v8cab :7n4(k.i l fmcwhay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force n8i4 f(.cmkab wlc v:7acting 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 abovg* .6 qca5trepe a floor to a height of 13.0 m above the floor. What is the change in gravitational potential e g*.a6 pc5qtrenergy?

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 +*yp)hinqq6fjqmz/: j8 d0 lb r)o 1:s g3fgfsm long and rises 2.0 m. If the plane is frictionless, how m8q1:g *3s)+ :sff0zf/omhrgbdqy)piq6 j nj luch 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 to stretch 2.0 cm. Whai7mt9 sx+v 2s,mn9lqlt is th,2msil nl m7vtq s99x+e spring 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 conao ; n-;vm2o5p *onzija 3pzx9stant of 60 N/m. How much potential energy does itmax 9o5pnj2;z o*-ao ipn;3v z 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 ren7q/k-w,j5 l qcek,yiquired to compress an initially uncompressed spring with a spring constant of 25 N/m by 1q5- k 7i,/ek,lj qcnyw0 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 stretch3gsu) v5z f1uqxy0yx0 ajx 4u7 a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the un3x0xfu 40a7gxu1 y 5y uqvzs)jstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. Ho mfgkj/: 6bnl6w much work is requirlgm 6/jfb:n6ked 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 *0ozwzq* mp2j of a 50-m high slope. What is the speed of the slier *mz0 2pzj*qowon reaching 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 initpp6 wk l53b9mwial speed of 4.0 m/s. p3mw6p9 5lwk bNeglecting 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 whsr .,pbq*wjlg3 6 l40 zuti-sgtg/6jdf9 i*the bottom, it has a speed of 9.80 m/s0/z tj- lwfpsl3 96*htsi*qgd,w .b gg64ruji . 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. When it is 0.70 m abovm *d nlkdipx :h0.)1ez8v)-:daubnzge the floor, its potential energy exactly equals its kinetic energy. How fast is-:zd0u)ephlz d*)gv : kid8x .1anmbn 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 g rbf/z(2s3 ylw e p/9m)qegx*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 doeyr2 x/3wb / qelfgemzp* )(s9gs 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 zbk1 :jxzf 3s1 akus9;m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 1z3 u;k1sbfzjs9:1ak x20 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at cki/3ouhqn . 6a 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 above the botnq3k/ ch ui.6otom 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 o 9 ;c +f3tfa9tafljl0bf 5.0 m/s at a point 45 m above the bottom of a dip (See Fif+0lf9ajalbc3t tf; 9g. 6-2). Neglect friction, 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. 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 710-nvanauw b30 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 slobnva a1 -07nuwpe, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of itie.+-zokf(gi*v8f0w q mv3w os swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the v1-a/:wesi bvx e2(tc mertical axis and released from rest. What will be its speed at the bottom of its sw e /:x-tai(wvc21smbeing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed nb *u24ksgbees3lu3y y wro011*;z gbhorizontal spring with spring4lg 31o; ukwy3zgunb0 y e2srbe1 bs** constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to ,2 5)qg (wu do-p ddm)twg2kirstop for a red light. What work id d g,wpgwr(q) 2 ui2d)tmok-5s done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal s3.e1e - rza k0 ssuxt-fm3fex8urface is 50.0 N. If the initial speed of the object ifx u-.-tsee0zf 13s 3ae8 rmkxs 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 kinetibr7pll-hq7+d, a sy8vd 5 eerr5 w;+ric energy. The friction force on r-+ir 5 75+hpl8dblvsaq re ye7;rw ,dit 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 horizontybv6+4wsw9 e bally to a 2.0-kg mass on a level surface. The coefficient of kinetic fricb4sb+6 wwy9v etion between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If the wor,p5 qdy.jsko80xjv wz4 *ob 4lk done by frictd j5v, wlxz4 syk40q.bojo*p8ion 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. The plane is 4.+cxs-4 a+ dhz hvqihhh.d0d- ;0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top ofd. 4hxchhsv dhzd-+hq-a ;0 +i 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 frbot;ygtte tv y52 .6q3om rest 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 of tt5yvt eot3 g;.q2yb6the 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 heighp 4nx/)3zc8wkrdos-n 8b4w axt of 10.0 m, and strikes the ground with a velocity 43 - )kw8 nxpdr8sawozx 4c/nbof 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 n67l(/ l elutq7stbd8 using energy when he runs up a flight of stairs 10.0-m l8 l6 n 7ue7qt(t/lsbdhigh, 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 os p 3mi-( um6tw1mtpc;bject with a constant velocity of 5.0 m/s. What po 6;m3 mim1-csuwtt (ppwer must 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 energ8py(+ 5d fewep)fl bkchd+)4oy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)yce +d+el(wfp fph4do )5bk8)

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 her p, ,8oa7z gubmfoot push7g8p ua ,oz,mb with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average p(rkf4hvpdsj cv5/j;u d4yf, w 6n-p:bower delivered by the engine? ( p4(ub,;d-j6hf : 4ndv 5jcwvsr/ yfkp1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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