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

1#

What is the correct unit of work expressed.ik xcysyq 8t;6;fj ;k 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 there is no motvf2t 1 i8vnwq8ion?

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 amounto1b0 g12zfgv(we 7ehebr fim .0 ram33 of work you do2r. (110m3 bv7wem3re boiahgeg 0f zf

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 adu l+swz qp3by qs0fe)44)w7knd is being held there. How much work is being done in holding the box in s l)w3zy7pdw4fq keq4+0b us)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 vour 1 /o-zulq1elocity carrying a 10-N object,u zor-l1qou/1 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 lifted z,-b1p/5f bd zkpsww+ 0wl lq4vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much worzl1wbp+sw-0 4bqw,pzkf/ 5 ldk 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 acting8lcuzb (uc/n 8k1i;tr a- gaq* 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. Compfos g7c-y5 o;jare the sign of the work done by gravity while the ball goes up with the sign of th f5ooyjg- 7c;se 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 Fwou0o0qvb jybr 14k* .xgp1;so pg+:borce versus position (F vs. x) graph, representsqsyrj4pu0wop*1b 10ogv ;+boxgk . b:

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 posituv,gb*34,gocli o i0rion (F vs. x), what represents the work done by the c04l,i,uoirbg o*3gvforce 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 pp,+ hf7,xfw8r1ku2vq- kkg fuositive, 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 objni-t 7a idcvc1 -+ob8pect's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, nbp mo 1ehl p+57foh+5then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed 0a e9 fsfas17qof the car. Which statements0aeas f19 q7f is true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the sre,5lmfp d3)(6z mh ymass of car K. The kinetic energyl()p m 6hdmf3e 5srz,y of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back ur9b+tyv uv.(l7-rkbfc83i1 gg j * phwith half of its original speed. What is the ratio of the final kinetic energy to the initial ki91* jkrugtfg+. bl37( -vu bpri vc8yhnetic 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 peb8t)(xm+eu pstble is moving at a speed of 5 m/s.+up sm8(t)te x If both objects 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 is movin +iavmqkji-wj 6:m7 z99tywq+hw 8-qk g with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distz +iwatvq7kk9+wqh :69ymj- jm8wq-i ance 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/1pgpu*z4 h -fab+6qdt(p n yb car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what disthp1uz dq/g4btpy6af-+n pb* (ance 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 d. 7)m3nbmxk*b c0/qxjps4 be Sun in an elliptical orbit. Neglecting any friction effects, what37ck sb bx/m)4ebn p0 jmx.qd* 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 principlegz;3ubyg36;y/rjdh2 qfun z/ mp8a+m.

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 enefm489erb* xsj1bm8w wl-t l: irgy?

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 s.bv*)ail1 2n*uzlzt yecond object with four tlz*i*)b atu1lvy2n. zimes the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. If h9cq1zw.d 51ms* sqn;xp md5j fxw/f3an. 5fq3msxwfp w*hn 5 /qdx z9csj1dm1;other 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanicalma 9d q10g,ifr energy 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 tree. Compare its kinetic energy2 tw-adnw hpi +7+gd8s K, to its potential energy U i2w7d+ dpg+hat- 8nsw.

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 fs j07;mc y,xsf6odma5o h.kwj ,p+j;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 p6a y*ylw9 e: je:xcmn pc1,h.and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a grean6a j *cyw,1m pclhy:e:xpe. 9ter 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 w: e3bbag) pe7$m_{1}$ 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.g7ck 0 (g u(pewjevc/ conservation of mechanical energy for conservative forces. we0(gckjcu/e pv.g7(

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 buildingnxqc iw5;t ;u-v r0tb., through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking theux;qv.;bi0 ct t5w-rn 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 ai15c(txbfwc/d o (im m74t 9sgjr resistance. How much gravitational potential energy dij(o5t( s wxd 4mi9ccbm f71g/td the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of g u4kc fel).iz,.aa;keravitational potential energy. Do not ignore air resistance.lk,.ef.za4u) ce i;ak 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 o:p) syx*rxhtd0vu9-b9 h q;haf 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 isdf 2(w2 a, 9jh8 uq8vs+fdypbf

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 ins5 ; jikvb 8vi:tb+5bc SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a upm,)8hc: 2j2wrr tmf)zpp- kg5 tus6o nit 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 50l68y ftugjqthe time. To do so, your power outpyug6l 50 jfq8tut 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, the6efj lehtzxuar( ch16yn;ng(g2:2*e 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 verwsap/eyu 2q)xq nd2: y *ky-(ytically 2.0 m and held there. If the object weighs 90 N, how much work was dys* xqeywyup2 / )(yq dn2ka:-one 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 ;,z+ hyhdri+xair a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weirdy; ,h+i xz+hght 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 wmsgh* 6kvg.smiegc fvn5 33 w( 0r0n(bith a constant force of 5500 N for a distance o 6fh*ig.m( s0vbge0s(ck n5g3mv3nrw f 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 upwa 8z9m rwrjo.7i1c) .uvevo9k nrd with a constant force of 5500 N for a distance ko1z7)9wr ecjov.u r9min8 v .of 50.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a distan-.0wf;g x p/2qthtl ,ao -fkcgce of 50.hgtw. aq2fk ,--/ o ;pxcgfl0t0 m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6 dp(l u6hhlzh* e6ozim,h*ftw o(,5 j6.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined at)n1n1g4wz :9opi vgz12hry-nxpop xcw s9u 8/ $30^{\circ}$ 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 sledxckr 06 izdba- 1n h,nizzlko;; 14cs1 on an icy surface (assume no friction), with a force of 60.b1h-zr 6ona is kc n,0;l1dckiz4z;x10 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 th1ix:w +fxljlj-s x 41ae force. The graph in Fig. 6-1 shows the l4flsi1xx-1 a :jw xj+force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fowkyn dt6qd lc8k-3s jw 9v+pz*j, v2x8rce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0wp 6-*2kc8x3dn,y9s8w q+ltj zvjk v d 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. ; -giaib:sd8 s4vsw5bThe graph in Fig. 6-1 shows the forc 8 s -ivisds5bg:w4ab;e versus the object's position. Find 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 force. 0.t qo lpuvl,5 em2ic20 fyhl+ The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when th2t u f0, hvpl2.qil+lc0myo5ee 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 (initially at rest) fxx kh *ay6/ ty,+tun3across a 10 m level surface. What is the final kinetic +6aht t *,/nyyxx3 ufkenergy 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 (initisba e-kmd83einh5 ++d+ye y(rz* vs( ually at rest) across a 10 m lea(s s + ehu3(iekdv+ nm5yb 8*ezry+d-vel surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is reiy5fj,nt vc *)quired to stopy*)ti fn,vj 5c the 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, what distance is rewl dabv6b-z58 1yy(ap quired to stop a car moving at 50 m/s under the same condition?b-p81avz w d(ab5y 6yl

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 proeo ))yu oul9g7zf s*/bpels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wilb yuou7z /)eg9f*sl)ol 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 80rjzs.u)tuzu /bl:rj dtot :b:-b+:f+ N and a vertical component of 60 N. The force is applied to a box which rests roj/.-d:trb u utu tz)::++jbs lz:fb on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizont fyy/ 4yt7ju/jally into 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 average stop7u /tj4jf/yyyping 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 67d uy kwp, 5;xjpyw(dheight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitatiopx(6j y,wd k7udw5yp;nal 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 eye+n+(ixnowtq4-w/ow p,w0 hw 23 q dup an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how mueoxe4+w,0(hqq2 /pn- owwtniw3ydw +ch 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 o0qtcnrvvj:q-q ,n k6l/q* ;fznto a spring, causes the spring to stretch 2.0 cm. What is the s j-tfv*nz6cl0 : ,/qn;k qrqvqpring 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. Hoh/y(pv l,r bbrt+4u )mo9jo 8rw much potential energy does ioj)br/t p(,ro8+myl 4u9h b rvt store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring wilzkka(3spu -g.e0 cs vrp 59n-th a spring co 9s-3ga5vlesk0zk cr u.pp( -nnstant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of .:0i.qkpwn mwr/w1g vspring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x =/w qrp..g:mnk 1wvw 0i 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 compress kng ds (uxcf0i(33*oaed by 3.0 cm. How much work ia3 gks*no(x(fd0u3 cis required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from - vqfj;f )(cf.arce4 lthe top of a 50-m high slope. What is the speed of the skier on re)fv-ffccqe a.rj;l4( aching 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, qlqz;r8 .p 7wz;s.e;ibgba 9epushes off the top of a hill with an initial speed of 4.0 m/s. Neeagszp;; 7.e89wq; bq .b rzilglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At th1zk 81fmlpgfs71 z5pwe bottom, it has a speed of 9.80 m/s. What is the vertica7 1flz1sgp5f1mzk w8pl height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floorrn 4s .h)v-xtges; l)x, its potential energy exactly equals its kinetic energy. How fast ixxg); )vsh.sn-4l rtes 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, blazt:h6u 8gn9h p.cta;sh33d ker06t yasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what verticaaa 30h st8ueh: r ;.g6c3k6dtpynzth9 l 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 energmltejum)7 4qu; (gc62 cag+ cfy of 220 J. At the highest point in its trajectorcg( egc6c; 7+ j fuutlmm)aq24y, 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 theuj iud+3 ;yzf0 bottom of a dip (See Fig. 6-2). Neglect friction, what wilzi;yfd+j30 uul 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 at a point 4*f 3aolej6uo. 5 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at thej 6eou3o* fal. 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 botto4rbs7y 3 7qjyfm of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the rollefr4s73yj bq y7r 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 swkv.hhhsw5 t- tm g7;3d ;c;lywing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.26 m a p7zv;h;7dhy jxflr+4ob2t9 tway from the vertical axis and released from rest. What 7phd;h vb9ft4zo ;xtly2rj+ 7will be its speed at the bottom of its swing?

A. 0.3586 m/s

B. 0.956 m/s

C. 1.435 m/s

D. 1.196 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal sprihjwnf)*y-l y5 ng with spring constant o5 jw-ynhlf*)y f $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg ca x*o kvzdk y;r2m5d6n56(r yjjr to stop for a red ligh6v jxy5mn6 zkorky5*; jd2r(dt. What work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force betyu8d-2ar gz:bween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slidugzy r-d28ba:e 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 ypfl ,o 7i8lmjrjo:7b.79xlza rough, level surface. It has 24 J of kinetic energyyr7o.o7ijpxb f8 l,7 j ml9:lz. The friction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. uar j/z;2no 1mThe coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved2z ;nuam1/orj a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. )*wbquwg1y yp+ ukh:: If the work done by fric*+u ::buwwgqy1 pyk)h tion 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 h1tl:th2kkdhk 4am2 9vtc 7/v 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to th:v h42a kl2v7 ct91mhk/kthdte 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 releaybxnq3y.8y n*sed from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. xq3y8. n*bn yyWhat 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 droppedtlepm+40h awy *;2y pd from a height of 10.0 m, and strikes the ground with a velocity of 72ap ;eyyd*+mlp0 twh4.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using ennyntzdzxq4 2.4 la-fq,g;*zs3o o; vl ergy when he runs up a flight of stairs 10.0-m high, inn 3fxn qs.zto4 z2ll4;- g* o;yz,qvda
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/)ain;k :b4o ems. What power must be delivered to the objec beom4)i :;nakt 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 runsanx12 of+(ime5 5 gauk for 1.0 hr? (1 hp = 746 kiuf52aag+m 5xoe n1( 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 whirjy5e-j0e+:gu k+dl u le riding. How much force does her foot push with when she is traveling at 8.0 m/ yl:eu+j+-rk dg5uje0s?

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 acceler9(w) xzl9 y+zeta c877gubuz aates from 0 to 25 m/s in 7.0 s. What is the average power delivered+zc u xb78weyz(g9z9)uta l 7a by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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