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

1#

What is the correct unit ofl2y: n:hrslr/wau1wefn-)8 n(y0 cv ho ovf.. work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if glx9a 9m5cf , exwfi)8there 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+m rd,3l 0w1dvwz: olp amount of work youp l o ,mrl+0zw3v:dwd1 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 he3c.o ji(r0q voq1 hbv f4i:-rq2d9 gdhld there. How much work is being done in holding the box in th0fv h-cio2r(b:q 14ov3hr j .id9qgqdis 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 hor y(g.s68gl :ob hxjdi,izontally forward at a constant velocity carrying a 10-N obj6.(g,hboyi8s :x g dlject, the 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 )q*p2td . otan9ds ra(lifted vertically 3.0 m then returned to its original position. If the total weight ir(9o)ttand s d*q2.p as 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on iybx;0ap,zg:pq3 i 5e an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straigsyo 4;w,iqf ;oht up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gr,y ;wi4ooqf;savity 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) graov6)iv edsnjk x-+ /)zph, representsd-)ixo)6sk/e v vn+z j

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work donerj, 9 ,luc*mwx+yqh0 r by the forceh,r0 *qmj ru,w y9+xcl 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'ggf,;zfqr /p *s kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinlu97avy nu .0cmj(qfzj.r8h4etic 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 o.mi us 07s nuqb4vx5a 9gskw56bject'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, aqws;0(43 xpyoa1pwqyn 1* p apjy +eb/nd is moving at twice the speed of the car. Which statement is tpn (p 3;0ws* /a 4qpwybyo+y ejpxa1q1rue 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 the ma:y 8h*y nx--kyr8pnzkdgu 73jout+ r/ ss of car K. The kinetic energy of car J, compared to car K k 8pu -kgn37:yr -ozxd*hy8/yn ruj+ tis

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 origina 2/t)m ,x99:s1zeujntkele7i a r g9hgl speed. What is the ratio of the final kinetj i t/ geeu)1:rlnhag9kz,se9 mt97x2ic 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 s tkt7dgrwz( 3-/g9lk czkjc;eecr)*/peed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objectsw9/t - 3zcgre jkcdk*7rce/k)(l;zg t have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass l w1yr lkb2ytz7 oh ).xf-5(mzis moving with speed 4.0 m/s. Both objectsyz2o-.(w1mzb y t l5xlf)k h7r 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, and skid a mn6 4lauyvmhbo9r e,ov- -c: 3certain distance on a s,a bomc:m3hueonr9-vly - 4v6 traight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun inkwu l87c v x;gsq56qe0b7+fth an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energqsu+6gq vtlc07;8fh e57 bw xky?

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 princippcbunitr,; 2+( qd.xf le.

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 potm s.hx0l);nwhnmn 3a) o(or-hfe pu7; ential 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 abovbo8h * c22q,vxinn+zge the ground. A second object with four times the mass of the first if released from the same height. The potentialhi ,ngx22vnob8c zq*+ energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to sa:m),p mk d4uj x;z6-std, (k4ue;tx.rowp af tretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sprw, arefx-)s,4 xkp.td;p:(jat4 okm z uu m;6ding 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 a9rpz uy7 5xs/i-li1 y/f;vamyfq3c/ 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 ite4psxit 7)q;qi1v7+symo .u o s potential energ4xsuq+ qvt 7ipi)s 1;7eymo o.y 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 carfre*de40rz (x 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 speedsaid5j4(1w hbzb ds9b c.m r4l)v ew/:m along a level frictionless surface. They both sd v4sww4 rm1i/)abe.czmd j( b :b95lhlide 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 :8fg+ -ovu k9zeer;: b6lvsen$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative force4f :90 ddmikw k/wd6res.f wd0r kkdd:94e6iw/m

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 z)si8shec1x 9 top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the 8)i9zx sch1s epotential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not ignore 9zw*.z khu8fy air resistance. How much gravitational potential enekw8 yhfz9z *.urgy 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 lomlqo5de)6u . i.)bel cses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energ) .ub) eq. co5ied6mlly 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 conservatio:q vhn15urmc 7stfvi;7hb6d. n of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is:k0-yd/zzx s f

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 iby(3q0 /m89xbry n 2moaqrga5n 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 no*-3.dkxv (giri9ps zo; oteud8 + 7eect a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-6 c+(u qdpkmc9third the time. To do so,cd9pmc +kq( u6 your power output 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 6hroygug60h9 ;k kr,i 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 ther, k,uzzet:h9rzmjoq.;epe ;8ty dj::e. If the object weighs 90 N, how much work was done ink8hq9jzyzte;z,r , :e;m pto.j e: du: 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 ;a 3m z7flayniu 1qx*)vj)2p 4janh9 econstant velocity of 0.50 m/s. What is the work done by the weight opefv m;lj)y*7hq i3 z4na9aax1u)j2n f 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 upwarddk kli 1 *d,svtn ,(oy*r24azs with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N force?z1 kdr4i,losk tdas* y*nv(2,

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 forc ,tj-dydka e0/fm /nq2e of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevae f0y// -2qak jdmtnd,tor?

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 puu79jg y..x1n(lv qh2hp atns1lled upward with a constant force of 5500 N for a distance of 50.0 m. What is t aq7xspju.ntynh1gvh1 (2 .9lhe 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 dl+ ktnxw0 4n*,,xlj omz f)2ra $37^{\circ}$ 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 rampw zm-dio5gb1z6 ef 1l5, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (asc sftci+e,r/be2 /nu/a+8kd xsume no friction), wif /8x /bin /tar+su2c ede,kc+th a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of -6qqh/pl4o1q a5h eh vthe force. The graph in Fig. 6-1 shows the force versus the object's oh6v5pq4 h eaqhql1/-position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. 3f m3b6 1kw.o5clbgrh The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obje 1bwbhokg 3m6rl.fc35ct 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 in Fig. 6-1 au; y1qcjw6u9.s-tmj shows the force versus the object's position. Fitywj as91.j6-cu q;umnd 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 ijyks,*w*nk . 5(wkh jforce. The graph in Fig. 6-1 shows the ki(*hk.w ,j jns5k* ywforce versus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart 08 sne -hr+zstlu5ci9(initially at rest) across a 10 m leve8i ze0c -+5h usltr9snl surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart u1ie xro750k z r1ym(m(initially at rest) across a 10 m level surfy0i 5zxm1eo1m 7kur(race. 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 movin93ff1+ lriee r30utfc g with a speed of 5.0 m/s. How much work is required to stop the u9ff+ e3 3tcrl1f0 erimass?

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 moving1tkhvz)j bgv (w)m7 bqtax,0 0 at 25 m/s, what distance is requirz0) 0hjq1km7g)bwvb(atx t , ved 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 10-g dart. It i xig m)50sdi.yslb6pd*3v m-(nyrqg (s cocked by exerting a force of 20 N over a distance of 5.0 cm. (-mp5is6) g q v (ygddm3bl0sy*.xr niWith what speed will the dart leave the gun, assuming 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 vert1 f9ue:y1k jq 5;mge)g7 sfwelical component of 60 N. The force is applied to a box which rests on lem:9eq 1 g ;7ksjwgfe fy)15ua 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, strikhbwz5t d :. f3+nj:pqfing the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average sb hd nzpw3:.q+jfft5: topping 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 hefiu9g qwg.xk93x j)1bight of 7.00 m above a floor to a height of 13.0 m above the floor. What is tx.w1k9gig)bx3u qfj9 he change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 mv uf4 2sd2ps0d long and rises 2.0 m. If the plane is frictionls sup2df40 v2dess, 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 to stretch 2.0 cm. Whaty 5j vm /j:/rutfkk+/t is tkvtjj/ry/k u /f:mt+5he 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 constant of 60 N/m. Hrb+cle xq/(g1 ow much potential energy does it st gr l/x+eqc1(bore, when stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncomprecrir7z+o w 8c ah.,dn-ssed spring with a spring constant of 25 N/m b+ icnrah 7-wc8rd,.zo y 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 stretcho fhb7b/s-3ab a spring of spring constant 40 N/m from x = 0.20 - 73h/baofbsbm to 0.25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. mx1v-60i0e ut 8x base How much work is required to compress the sp1e 8uxs -v0aibext0 6mring 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 fromhaj 63nv7;a63j2zfqyzv 7nu y(b: ilw the top of a 50-m high slope. What is the speen v( qni63ajaj3:7zvw 6z7l; yhyub2fd of the skier on reaching the bottom of the slope? (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 a hill with an initial sp fwh)9d pd fmpwdwo)j62p6( s*eed of 4.0 m/s. Neglecting friction, how fast will she bejf *o h 9d 6mw(w)pd)wp62fspd 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 frictionles 8/03du3sh2 rg ce,bx+ssi-tmdrpn+m s inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the planr3x s+td2bu8hr-mm3 c,pn gd0e+/ isse?

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 floo6s +sei1xsiy od cu869r. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How ic6o 8 s916seui+yxs dfast 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 gro c ,ou);bjnzo.und level with a kinetic energy of 40 J. At the exact oc ;bz.)j,on utop of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 22q)qc3o3il1 lf9 s8 tsq0 J. At the highest point ift sq1983ci lsl3 oq)qn its trajectory, its kinetic energy is 120 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 a point 45 m above the bottom8b4) atzjltb* ir -jxo6p 7n2s+p4epm of a dip (See Fig. 6-2). Neglectjim 8zo p*entl)4x+apr72j bs4-6t pb 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. 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 oi2zs e1q,i o5lf 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). l1 osi2e,qi5zNeglect 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 30 m above the bottom of a dip with a speed l2x-n4 q(;v(ui pudfi of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed oi2vfu( (n;pdlxq-ui4 f the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (psdx;ad 6*90f9k fclcs oint

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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 l.k0lbbext/s /ength 50 cm is pulled 0.27 m away from the vertical axis and released from rest. What will beb/.bt /elx0s k its speed at the bottom of its swing?

A. 0.374 m/s

B. 0.997 m/s

C. 1.495 m/s

D. 1.246 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 br:6w./ipm/*ua+nlookb el3 at 25 m/s hits an initially uncompressed horizontal spring wl*m3aoo/ w/ieb.prkn+6u l :bith spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 1f3r2fwx x2xbtr6ay0 kg car to stop for a red light. What work is done by the friction force against awy3x0x2rft6 1 xbfr2 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 surface is :*iqq0.j p0fqshlr u+ /np4. )g mcwdu50.0 N. If the initial speed of the object is 25.0 m/s, whwhq)l0d0 cgf *4nqums.q+:iju r p.p /at 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 ha u4)y3 lq2to5f 2bpftms 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wib25t)fp42mqt y3ofu lll 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 a-ck 5mkr ,1ndtskefd8+ e.h0 zn 8 bgp4e/k9ivpplied horizontally 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 ine0 /fcn.b5pe+k-8mkdei v,zdt1 kn rsk8 94hg 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 slope08xr:yqo 5j cwpspan cen/)c +coj*0 /. If the work done b c rqoc)c josj: p8+cx 05//pn0awe*nyy friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and risesg dkpu05cwr , y a 9gv7 5k)l,*l7av7wbjlqz4k 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of thev vkl k bq4al7w yp9750w5ugg dkc,lar)z*,7j 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 restbs z:uff l (ou-nsk-;5 at the top of a plane inclined at 20e above horizontal. The coefficifs(zl-bkufs -o;: un 5ent 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 651,- f ;k pn wchqpxft*i4auxthe ground with a velocity of 7.00 m/s. What average force of air friction acts on it px, ;-xft p1w6n4u*cfkih5qa 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 boy9/x*:nrgno n *lr2vc qzlmguf1+ j53c using energy when he runs up a flight of stairs 10.0-m h3l9 o*/5nxmrjl c:n2qrfc nuvg +1*g zigh, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. Wlhj 1 bn9;mnw:i m*o7ohat power must be delivered to thm i n9l:hooj71m w*bn;e 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 z0 lm nzp/(*a.bs6vooused by a 1.0 hp motor that runs for 1.0 hr? (1 hp = /v 0zsolmzo.abn *p(6 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate xl0 z+.vx iav)nvr+e,of 500 W while riding. How much force does her foot push with when she is traveling )z v0l xx+nv ,.a+eirvat 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 accelerc5 1+lfyfcx(f ates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the enginelc f1fx5ycf+ (? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95