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

1#

What is the correct unit of work expressed in SI u2 oye;ssae0t6 gjc1e 8nits?

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 q fuh8z,vb 49jthere 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+:f ( atxwlcq(, the amount of work you+w(q xcfa:t(l 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. Howt; r,7uj xx2dr much work is being done in holdrx2d;j7x t r,uing 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 velocity carrying a 10pt/tthl1ted wkj0 )a gi1f .4--N object, the amo) htj dte-0 ia4g tl1/1wf.tkpunt of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertuz vr72; efvp9,dlr, nically 3.0 m then returned to its original position. p; ,v zf7nevrlru d9,2If the total weight is 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 o .e;1 bzpjb r13bn)7r4sbeigwn 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 the t/13 x/ mik1kbddp7rdhf*,5w i v/ mtisign of the work done by gravity while t idw t73//kbd*f /1,p1xhi ik5mtvm drhe ball goes up with the sign of 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) graph, represene3(iu dwrn ,(r tz6tgi8 ok2o .t6la0uts. (i6ogtlz aok3u8ud,6ttn0wr( 2ier

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.pk8m4qi8cs -)b9sk exg i z3q vs. x), what represents the work done by tqm .iqc4k ss 9pe3-)ig8xbkz8 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 positivtwf7te4;9z pqu0s u :mza5qk, e, 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 objecti / ej1 ulj;o.*fp( ywnu;ujc( 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 1z/v9ao.nomy object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at h 8)7tvgpt7:z8sioo v0*as- k6wlaobtwice the speed of the car. Which statement is true about the truck's kinetic soo 8p)07 86w7gbs * kht aloz:ivt-vaenergy 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 Kqhs*,lp5gq e xo(i-asja+ ,3q:zm mi9 , and car J has half the mass of car K. The kinetic energy of car9 *q+a5zpqa sgq(xjo3-s hl,m:ie i m, 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 wif.w b6*she:x; eiha f+th half of its original speed. What is the ratio of the final kinetic energy;h.6+i xhfe*:aeb w sf 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 mtnam ,.s6ll9aoving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's massa l tm6.nls9a,?

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 moving6 rqpkw/rz38 r with speed 4.0 m/s. Both objects encounter the same constan/rwqk38rz rp6 t 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 yo dpw-qkgaft 20pb2.-t; vwo,pur car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the c-tw-,2.wdf t2pa;vpp q0bg koar 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 the3 p1bwft20oah nlbq- - Sun in an elliptical orbit. Neglecting anyl2 0wbtno 1aq-bpf h3- friction effects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principydp( c6r+i wu-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 negatehd uhg7i* ,(kive potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second osa1f k o9m,4kpbject with four times the mass of the first if released from t1 9kfosm4kp, ahe 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 the end of a spri* hbee84 4vfqwng causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy o ew 84vf*beq4hf 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 a kfynqc+e hu+2683:iwv lid 8lsystem

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. Comp ig(b0)vg7;mna b)yr v23rpnware its kinetic energy K, to its potential energy U(7w y)3)mi0rbgbgpn;rv2 nav.

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 drivingq0fwf)/jon +5ltgi)b4w amb 2 up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speeds jij06xm kak /-along a level frictionless surface. They both slide up tmjjk 0 aikx/6-he 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 i d,4c9, vtpty$m_{1}$ 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 mecpmm .:ejha p03ua .-xdhanical energy for conservative forces.ema-j.a.dx hu: pm0p 3

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 builqyb21;qfgpd,rk. 8( orbmk r 734qfrlding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking (br gqroy2p4 qb ql3r7mkdkff;,.1r 8the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air+a(- anj7 29 d-ivsbz fzpbdh- rei--b7bzsa-dzhv+9 j(p2f nd asistance. How much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and losesm2nyv+g in 0ol(cbc1 xi8zkti95v /9s 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic bxi/l0os 5tkn1 2nc9vgy v8m(i z9 ci+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 conservatq7 1ywe hb0.hr f,;c*ezmvo1tion 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 isof1i wu4nh6j 4

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 8 6n,trc;c on7-gmenhsp6g8h power expressed 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 s4 ji4.ah0k0qlveac 1is 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 gi f0u2xc ,teu+b4l:w, you did 3 times the work in one-third the time. To do so, your powgc24u0wue:t,f+xilb er 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 car's x f ck7siy3x3 ei;b0t3engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the obc4ljjs 3vfmju a j;2()ject weighs 90 N, how much work was done)mjjlju(f sa 4 ;jvc32 in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, ac7 -qtuhdy4u0j3cronh 0u- k6t a constant veloci- tuh7kdc c0o0u runjh6q3y -4ty of 0.50 m/s. What is the 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 constant force of 5500 N foa*yc 6q6o s rsno9 x5u)qluk+-r a distance5n 6 +sk croul6)qxo*ayqus9- of 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 forceb5pb fm, 9fi;z of 5500 N for a distance of 50.0 m. What is theizb;9 m 5bpf,f 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 h 9 vg sh3gvbsjw v56n.yi5a,tu4(y5nN for a distance of 50.0 m. What i 6hvjv5wb5(tigy3 gn n945,s h svuy.as 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 mvq +2o6 hqa7 1/qs ej2b- gj,vdv/mufj;qhg 6y up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp,7t*lsy 5 6gfc.ufsqg1 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 Sain 0nc 0doa zjo*-5oa,rah in a sled on an icy surface (assume no fric*ozin 05 0jn,aoca-d otion), with 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 t-o3ddx0tyd/+ zg1 sx8v yiaa)i9 a7 sgz:;z fahe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work d9 -8v31 0if+xsztg:doy as)azi ;g7axdz /da yone 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 dian5 u0fmy,mtt u1 be1 cjrn+5dbl-s -*rection of the force. The graph in Fig. 6-1 shows the force versus the object's position. *01sa5 ftenucrun-m- d+bytm5 ,l j1b 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 of the forcelfe5z( ag++i s)ldm4c. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to )m(+a cgzis+l5 ld e4f6.0 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 fz i3-7e .; ysg:mc/oni,rltrxorce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donesg3n/.y; mi: 7irx r ,-elztco 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 ac pxblan58l81 pplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy o5lb pcalx 88n1f 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 (initially at rest( oz:/rdb(yhnfa6 yr-) across a 10 m level surface. What d(r(y-bf /6y:roh nzais 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 speihzzqp:38 8 darc9t;9p,v n rhed of 5.0 m/s. How much work is required to stop tpv93h :aq htdzn,i8;9z8rr p che 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 25 m/s, tpu-tkt p0,4o what distance is required to stop a car moving at 50 m/s under the same 04,kpt t-o uptcondition?

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 propelsljb*bp: i g)n* a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wi*bn)g *jb:i lpll 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 an ;hlwhzd-t )0ld a vertical component of 60 N. The force is applied to a box which rests on a levelhlt ;dh)0 lw-z 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 0ltzdr0pe .3 rinto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the r3t d.zp0l0reaverage stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a hrmi**kp1nv l 27 1xsxbqtu+p5eight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentiak il xq*x1 p7pn15b2vm+ r*tsul 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. Th.5q/cu h ;bleze plane is 4.0 m long and rises 2.0 m. If the plane is fricti5;qblc u/hez. onless, 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,.7p 9c 8kysxvgn0y4mv causes the spring to stretch 2.0 cm. What is the spring c4n87mvpsvy 0. y9gxkconstant?

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 consdd2fz05ams6kuc7 * /r 5alzdgvwt/(u tant of 60 N/m. How much potential energy does it t0ag dd ldcz2m a6(zwk5f/ */vs7u5 urstore, 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 uncompressed 8 gmhnh .bxy:a8cv0*m spring with a spring constant of 25 N/m by 1hn: *8.m8h0gbay vcm x0 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:ppg xd- py;7v/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = y gx:-pv7pp;d 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 .l)x2nh+ c0hf.,t8gxcxa p u zis initially compressed by 3.0 cm. How much work is required to compress the spx8 zfx g.,h2+hcxul0tan. c)pring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What ;gxkh* eh-1k dis the speed of the skier on reaching the bottom of the slope1hgkh*e dx-;k? (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 k9gcb+zu,vg- wg, pushes off the top of a hill with an initial speed of 4.0 wv+ cg,z9u -gbm/s. Neglecting 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 fricv (o(m5arkl ;;jzm.pd y )+yzntionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the verap;yrmn m d; ()(ykjvozz. l5+tical 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 thf x sk9n5pxo: cf3u)0:2wqkmhe floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energ0q)khu53p:2m o9k fn xc:x wsfy. 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 s9n-)av;zd m uiis: ys3traight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mech: smi9 3vyn zdaiu-)s;anical 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 enek5 bo:de cd*t;rgy of 220 J. At the highest point in its trajectory, its kinetic ener5d kb*td: oec;gy 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 s2w, xm*r;hm sfrom rest at a point 45 m above the bottom of a dip (See Figs,*; 2w xhmsmr. 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. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s amiz amhmkm0 w5 +h1mqi7, (s.1jm)ivpt a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next s v jmkp i0.hm)7(m+m511himazqi, s wmlope, 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 k vjng)if/g0g d,qm1m t0xl-8 a point 30 m above the bottom of a dip with a speed of 25 m/s (See Ftm8qgigv/ nm ,-x00dfljg1k) ig. 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 ball at the bottom of it k)c7jk g,)a1qsz*yc ys swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is gtfki-4 tl.6* kf4rnz pulled 0.29 m away from the vertical axis and released from rest. What will be its speed at the bitfkfgt*z.4l k6n- r4ottom of its swing?

A. 0.404 m/s

B. 1.078 m/s

C. 1.618 m/s

D. 1.348 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-9g ykolclv5 ; at 25 m/s hits an initially uncompressed horizontal spring with vlgy;l 5c9k-o 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 22o:av 0fhv.ie;ld5n v6 m/s, slows down her 2000 kg car to stop for a red light. What work is nd;fve.h 6 o 05lvv:iadone 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 surface is qa(gjd;8aqmh2*9z pd 50.0 N. If the initial speed of the object is 25.0 m/s, what dqa p2dz;mdg j8q9h*a(istance 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 mov/zi7/b/gpjlt,8t6e kwis; dping on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a consta //8li kit pjzpw7b,dg; ts6e/nt 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on (6vf* w:a-phksx(bz4i afoc 7 a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distancecfw:*vp(i(4sf6 oh a-z x ba7k 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 t afu2v,4fhd/phe work done bydv/p4u2 hffa , 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. b- o4ik.djnua-/8uh l The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the bo-.b 8 u-/aiu4klhdjo nx 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 releasedub8lzheis4u6a g1q1+ from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass luae6q ub1 shi18z4g+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 droppf7q8/rwt ym5g ed from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average forcmf 8y/r qgt7w5e of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight okrml/ nwq9j yme*6j)-f stairs 10er)j6yj 9m-n*k l/qw m.0-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 goig3g.yd h(/o * fo,hto move an object with a constant velocity of 5.0 m/s. What pow(o,*y. igdoh 3hfgo /ger 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 energy are usedr m+q.zw7c/.c r e):p5mtuxx v by a 1.0 hp motor that runs for 1.0 hr? (1 hp w7.ce5xrq: u+/r mpzvmt)x c .= 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 tjxu1t omdt1qfr4+9es/ay0 r s)o q(i- he rate of 500 W while riding. How much force does her foot push wtqox-rme11)ssio /04d+af ( u jrqy9tith 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. u1vhw8dp,f s+0 s. What is the average power ,h uv w+dfp1s8delivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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