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

1#

What is the correct unit of work expressed in SI u+6n)gg hi fu szzdlm5u96 s3o2nits?

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 thy) f ij0wihlhy.*o/ f-ere 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 hajci (o;h0 f 7h kh84gkr44byl nl,dx;srd against a stationary brick wall, the amount of work yoc(h,n;4ijy7; 4 l 0 kr4bl8ofxshgkhdu 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 vertiq3vs 2teb zg+ : c.;09nttsztrt- 7svdcally and is being held there. How much work i+t.307ebqg2s tt dvvst 9ctn :z-s zr;s being done in holding the box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velo8as*;pbg.nbh8 *vw,9yvl i adcity carrying a 10-N object, the amount ogpdh y,wl*svbv9;*na i8. 8ab f work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted verti2wdi+-u+a l jvcally 3.0 m then returned to its original position. If the total weight is 30 N, how much work was donaid++ 2u- jwvle?

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 acv48r bub/a zrfjz .4l)ting on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare ther8m a- zjn,ef. t,,fha sign of the work done by gravity while the ball goes up with the sign of the wor .-a,fntzjae,m,hf 8 rk 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. +r f- le/y.di(prlhpx6qar.i5 m12 xux) graph, representsxl 6 r.qafy1em-r/ i.p+uh2x d(pri5l

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 r: b:4xin+qw k( cozastt--ih 9jb57arepresents the work done by ts57cj4bw-:i-otk hbaat9:z(rin+ qx he 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 object is po;2aziz dv- a/nmlk44csitive, 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 on an object is negative, then the odr)d. n;)5 6qvlommu sv-m;s7zesy (tbject'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 (tr4mlo+.g8ozg o ws8 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 m 7ilaf:(nd zap ph,(7tuch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy lai :fp,ph 7ant((7zdcompared 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 mass of clth4 6qfet (fc)+ah/ xar K. The kinetic energy of car J, c(t +eff 6ctaqhlh)/4x ompared 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 wit3hcx7j 4wr)cgh half of its original speed. What is the ratio of the final kinetwj74r3c c)xghic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 t8:bco--3/vj-c a cbo4axrn tm/s. If both objects have the same -xbtcvtor3a cb j /o4ca:-n-8kinetic 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 is moving wi)dkb:y-hfhi) th speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whichyfd)hb)ikh -: 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 skop9l a 6g5) 2nb gz,suuflqc03id a certain distance on a straight, level road. If you had been traveling twice as fast, what distangs g cp u0q3 6auzo,b2f9)lln5ce 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. qt9)p7jwoe sut/* n f6zqo g3; Neglecting any friction effects, what happ67gqpf9 u w;z *)o3tsjnq et/oens 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 principl zi:*wm 6bb:gke.

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 d,yc k in,2etit7c*ux/qe7. bsx)1 uaenergy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objecv /lj.t4g-z oit with four times the mass of the first if released from the same height. The potential energy of the second object compared t/j-zlgo v4 it.o 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 sm : dmj3owm44.yt5zrcauses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the 4:3m jr. oy4zdstm5 wmspring 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 abc9 0 mhz1anfu:l(q8rsrnr ug3g62n6l 7(qienergy of a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a treyg4lik 2 1vvj.e. Compare its kinetic energy K, to its potential energl. i2kyvg14j vy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hilr;vix -bpis 6ymhz x niro(k 2l((*95al.

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 verya nh1 c(qfpru8tp7 ynel*://v heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whichpuretp/: /1c n y*7 fhv(8qnal 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 v ;bc +7bsb; -w+ddcop$m_{1}$ 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 consemccx g( qab-8.rvative forces.qac(x gbc8m-.

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 air8chky o7vpw(*i1uaqd l/g2m1 (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) mkducg(i8 a w 2vo7qpyhl1*/1at 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 envg 1w5/4d3ki3g gec mnergy. Do not ignore air resistance. How m kw/ 53e4dg3i 1cgvnmguch 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 o5(ain0a7 qt .h0vezhy f gravitational potential energy. Do not ignore aihyi 0h7ae0 qvt. z(na5r resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of c dfvt3duj;4rgsy ;v0p mq4wz, 3/,5m ar+tgienergy.

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 iswn+me e6 d;9ll

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 exprux 4t7jd z2 d4n. 5qjf.0h (tfrmpvzr1essed 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 isqmhg8d1 9quoh+r f fy29c1x9) zb*pa7zosg*p 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, you did 3 times the work in one-third the time. To d9jk3c xdom9g,-kg+ix o so, your power output must have been ki3 +k9,cgjdxg9 xmo-

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, thpj4hcuhds:*r/7 ftc9v-7m k ze car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. Ifz) 26 ,/ccgdsdaxi q0a the object weighs 90 N, how 26 /d)acdax,0 sqzcigmuch 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 up in the cri bbm:ef6z 86n;87w*yiora air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight ; iznw i8cr6mbafr8o*7ey6:b of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5,z 5sxi eurz /*qamf4p/4 4lmb500 N for a distance of e,*bqp 4zzlxu am//s4i45rf m 50.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for0ti1 ,ymn*+ penkfy7 m a distance of 50.0 m. What is the w t,kmief my*ynp 1+n70ork 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 5500p .j/wcwxej(x0k5dp. N for a distance of 50.0 m. What is the net work done on the elevat(.cx p0xwj 5d.p /ekjwor?

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-d+:sd8h; * 6bj*a oxjbo. 0phwzrd gm 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 sliu5y .h3 u8ubci i.s)- e/: wvhirkvy;ldes 8.0 m down a ramp, 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 litpjpopg jm,:(tgc+3 :i irhgy-;z:5f ktle sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.g3ij(z :p r,p :o; hy-tk g5gjif+mpc: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 dmujn9h ,;: wq;ov 6bpj:v8ecin the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object m; n,9b ed6wp vco::v;qjjhm8uoves 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. The graph in Figcnwgjtawn-5q / 146r q. 6-1 shows the force versus the objja/t416gwnwnq 5r c-qect's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction ofdi(vj ml/o qxj0g)*jn 2) ddq8 the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4o8 x(dqg v2d n*)im0/j)jjlqd.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. 6-1 s ,f3 j1ocvc8vmhows the force versus the object's position. Find the work done when the object moves frovcfvj 8c31,mom 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 5t0vbxn2e)4qb:a,8gll jl it+w6 yzt2u 4e jd;5-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of al x,dtqzl402evbue;wtb: tgn 68y li )+42jjthe 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 moveimqd;5/,j( j htti 4jz/p(y-dsx (qub a 55-kg cart (initially at rest) across a 10 m level surface. What is the final-,pi(jjj (dbydh m;z/x4q stqu(/t5i 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.g n8lr :i/6d /qght3cl0 m/s. How much work is required to stop the mass?igqhc6/dllr :/8ngt 3

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 /7nye)xpzma5tkzp 49b dbx87 k)6vrwstop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s u z6 pxbbd8p7vknrz/a )4yt 7 mkx)ew59nder 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 g9 csj6;vp0uyiv/ f8p lun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has vls/jp ;p0 6vu9fy8 cinegligible 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 component6k..gs;nl8q au,bq rq of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 mk8q;s,qub n.6q lar.g 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 th10uo es).s(/enzltld z3 z+uxe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acti zl 1dzslezunx.0/(eo3su)t+ ng on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor tokc j0l ut(*.f3d kb*02k* bnyqr/jrj b a height of 13.0 m abovedfj rt 0cnb r(bj/k 3bu.2**ly0*qkjk the floor. What is the 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.avrq 97qehpuv*8,+zv fas2q20 m long and rises 2.0 qru e,z+29aqvp2hfs *8q avv7m. If the plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. What iuoj6t1s5kr, y wye-x2 s the springyoykwe1j-6st5 ,r x2u 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 sprin/nq d/3 b x gw,- a*j ww.+hi5(*pbrfmcfcmo+lg constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 w3wqh/r pi/cfn*+ 5*j+- wfgx,cba (.mb omdlcm?

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 h/w) ;ds kez8ucompress an initially uncompressed spring with a spring constant of 25 Nz ;w/ )e8kdhsu/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/mll3ar fnbl+ fl+7-ls * from x = 0.20 m to 0.25 m? (Assume the u+al- b rlnl3f7l +s*flnstretched 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 cmibt b *b2wrc98. How much work is requirew bbi9*r 8ctb2d 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 fe f0p uq -d / y,9z8jctqzs36ja4iy,xjrom rest from the top of a 50-m high slope. What is the spet3 j iea jcp,8 z/96f,jxu0 q-yzds4yqed of the slier on 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 8 ln8.r a q 25z8dgi.;ptghjshan initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after drshi828jtp a;d8q.5h. zggrl nopping 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 incline 1l4g.ilwk5t .lzqr e;d plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical hei1wi45ll. ;.teglrz q kght 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 above the floor, its pf *+fl xez3gf7u) t3vgotential energy exactly equals its kinetic energy. 3*gtug3z7xf )e+vf fl How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level w.rai g- sx oc +erbre,+k1i)u t2qku/-ith a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 14rk+icsk 1i/ ue -qr) 2b,eourgt.- +ax0 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 220u8qv*qc qcb9 w*thc c; ndt 8wi:d211l J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertiqtc lwb*q9i18hnc qw:t;c1 v2d 8dcu *cal 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 fros c;jbp,e u ;35ge 19 5mjpotwqt)rc1km rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the topmpe 5,bc1rgcskj53 oqu wt ;p;91e)tj 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/s4i,)xs q gvs)v at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect sqx))vvi 4sg, 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 dipml2 -*udpvq ;b with a speed of -pvdq2;*b lum25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of 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 baq: xq9xsczw4z :6j)sjll at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from kem)4wdj( p e*8klyz) the vertical axis and released from rest. What will be its speed at the bottom of its sw8k(jmzl w) )e ykd4*peing?

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:m 13adt(wo bb)1buna at 25 m/s hits an initially uncompressed horizontal spring with spring constana:3)to mb1(adwub b 1nt 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, s,cx+fpg( ii1gmvdo :*lows down her 2000 kg car to stop for a red light. What work is done by the frictiid+*,fipx gvocm(:1 gon 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 surfacofwm ,r5 go.h:e is 50.0 N. If the initial speed of the object irf ow.og m:,5hs 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, leve..bz yja y;j5gf:8hnp l surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide;pyjja5 zh..g yfn b:8?

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 aqt4;,pv/q odi5 g,49siu jut6rk mga -pplied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic frictijgi5sv tk4trog/ui m-, d,q 6q4ap u9;on 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 rem9a l9v.tp35o opq5nb st from the top of a 50-m high slope. If the work dono 9o5b.mpn tap53v9qle by friction 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 4.0 m long and1 b,s b +*bpzn);oazte rises 2.0 m. It requires 3200 +zb1p btas noze)*;,b J of 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 rest at the top of a plane inclined -npr bwc 9,v.n4tys l:at 20e above horizontal. The coefficient of kinetic friction between thec:b -.nn9wy4s rtl,pv 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,m i6qyv5+7 yvf and strikes the ground with a velocity of 7.00 m/s. What average force o7vqv+i5f m y6yf 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 9g9qqg7etw)l9sf0l7(og dk va flight of stairs 10.oe7lk9d7lf gv9g()s9g0 wqq t0-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 needed to move an object rr-v7h;8kzo2z:w7kf8 bcrr u with a constant velocity of 5.0 m/s. What power must be delivered to the objectow;8-k 7rfz2 rhv8r b zcru7:k 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 h hhb ;ojo.;wbuvljk4iu8igsqj4).s4 ,o :g (tr? (1 hp = 8is;.)ub jvj(qh;w:44o.,4bui st ojk oghlg746 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 w11w swp1nfm95zv r3oc,u - x2wyy8mukhile riding. How much force does her foot push with when she is tra5cymyr1 xokwm2 nfu z3 ,w1 8u9s-vpw1veling 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 thek2d2v dqu0v/ i average power delivered by the e dvv2/ 2iqud0kngine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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