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

1#

What is the correct unit ofxrm*0j e(3dh6gf sd,m work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there isa-z6;ex 4v mryv8:quo 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 stationajhz5ojrf+ cd:d .jei6 h/ x6m3ry brick wall, the amount of work yo65d:c x+ jimj fzde /jh63h.rou 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 22l*gtoysl5g and is being held there. How much work is being done in holdinl5gsl* yo2gt2g 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 forwn jwbx( , y:zc5gwt0ts+e9;ttard at a constant velocity carrying a 10-N object, the amount of work you do isj:tbsg ;ttwx+e ,t5 n9z(y0wc

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then retun :;5 xth-msoprned to its original position. If the total weight is 30 N, how much work was done?x;5h p-tmnos:

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* z)ebtkt2w7ftltdc (:1e1cn acting 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 the sign of the work done by gravity (lm0-qfajf ;wwhile the ball goes up with the sign of the work done by gravit;mjq-a(l ff0w y 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 pos**fhr5orgcoh+vfdnj- yu; ; 3 ition (F vs. x) graph, representsr vh3*u+d*ngf c;f;ho j- o5ry

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) +teyb7cilo+6 , what represents the work done by the foretlo+6c y +ib7ce 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 a2a xqom 3tke+8n object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an obj;tyi/mich; 1u ect is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then thyd26cbum :9/j )cfqio* 7iji ye 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 tw2. xru 4s0axtar74djs 99 lmreice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car? m27 r4.xxard aru9tj s40l9es

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 hav jn+o 9vs7e(cbu/sa5a fmy 21lf the mass of car K. The kinetic energyoj5ceva7 vm 9u/21ssyb( n+fa 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 withew) c iib18r4zvgwj8t3cu2,o half of its original speed. What is the ratio of the final kinetic energy to the iuobjti)cz w 8r1 2gci3,84wev nitial 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 f:uxk.qh2uwscb/+yvm ); 8s v 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio)uv2h;u8x kq.m+w /syvcsf: b 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 massd-m+l8l xb3hc 2)v oqm is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stoml)qmb2lcxvd o+-h 83pping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distanif:8pdgy k. r::ub7lex)9uq.k5xb tvce on a straight, level road. If you had been traveling twice as fast, what distance f9qtr d.u yik)k.x b:8: 7b:pux5 levgwould 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. Negld;swya wx b:j69b70qv ecting any friction effects, what happenx06;9wdy: b wsvqba7js 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 ctby9is*csfh(5a q*7vg. e0kprinciple.

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 pot 1(ujpd2l f;rqpga8:vfrh 5i3 /8kditential 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 h)-c cd w0 -duuuhl0f2object withcd 0uc l)wu-uf-02hdh four times 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 stretz+6iqc6s ps8ich 5.0 cm. If another 0.200-kg mass is added to the spring, the potential eneicszp+ qi8 s66rgy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systeoetv n :,)b0+prqd2ae,mf63lt-;h m gkf kw o1m

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to itsl14* 5eg nohfw potential energy U. n4o5hg1e l*wf

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 p1j*c2 d; d;x;5ksicpsrc dl -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 vernu9y7rzdq qa +0,4zxv y heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the vay0nx9 du ,7qzq+r 4zsame 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 l2, ;d1 he.yb:d rfkhi$m_{1}$ 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 conf mkz 5agtz84.servation of mechanical energy for conservative forces.zt.a5zm8gk 4 f

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is poolu4v5l 3;sjtin ;xu;2*mx /ypia 1iresent), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the iisxoi4utoj/; ;2xm nap5u3l l1;v*y 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 distavfh9rjls4/ 9g icu-(ence and gains 30 J of kinetic energy. Do not ignore air resisrg9(4 jlsvi9 u/ fc-ehtance. 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 loses 30 J of gravitational po1pr au4j8/o 0bvdkf1n tential energy. Do not r db a o8v1/u1f4kj0pnignore air 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 conser/lhaf5g. j/ (xgwk6ahvation 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 isirjg4daj) 7:gfaj4b;c ) lvf t)i/ (b *uz1xoa

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 in SI unitsst5m8f0tnx, k?

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 unit of plj -zciilae3y.1/ou/ 6dbe *m ower?

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 tylcsb 5d*y57 6t+otl .obl:k yhe work in one-third the time. To do so, your power output mustc5t56:. yllk* l+bys otbo7dy 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 ca+ lr,w:ea6p :d rdlq0lr at a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the objec7108a+ivrzaa2 cqnclis zj 3cuxk ;/)t weighs 90 N, how much work was done in j/ala i1rvc;i +qas8zk)x uczc n0237 lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a consimp mg/8 cr bzgg-,i*ig.5xi) tant veloig m85.g*g,ic-mi bxz)p/irg city 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 5q0nch1r w -0ubwqt76khhk2 9d500 N for a distance of 50.0 m. What is the work done by the 550b rw9n762qu1w-kdhh t 0hk0 cq0 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 conshka yn4(n;8 gf /no+tmtant force of 5500 N for a distance of 50.0 m. What is the work done by the weight omn/(+8anh tfykn4o g;f 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 yerz1h dq ,;m)of 5500 N for a distance of 50.0 m. What is the net work done o1 ;,z dyehq)rmn 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.g j4ufhk// 3md0 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 3mdq ,ekbhl7 xb( b2x:slides 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 little sister Sarah in px2nmg+l; v(n 6hpv r+1rk7yk a sled on an icy surface (assume no friction), wivhlmnn kr2x+ppv17(y;k r6 +gth 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 the force. The graph in Fig. 6-1 e- wmlcwz)(9 li8 yia- *mi:jc shows the force versus the object's position. Find the work done when the object move y z-w*)lw :8cmiaimi9(- cljes 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 obj: n ob;n.k, /3x 9qutywgfij2vect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when fqwt.j 2nuk/ino39 y gx:,b;vthe 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 o)j3i/a ;mq on0l: knlpbgc-l 3f the force. The graph in Fig. 6-1 shows the force versus the obl ib0nl :anqm3)o- jk3l/g;c pject'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. The graph in Fikrwwc. z4 qz/-zqd- u*g. 6-1 shows the forcz wq*qrdz/ -c-z wuk.4e versus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applies)x v:h/-vn ikd to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetiv- k hi)n/v:xsc energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is appliep0, )mgkm6*tywln qi /41xzuvd to move a 55-kg cart (initially at rest) across a 10 m level surface. Wha ,)yu n*46xm1kiwq0 mvpzl/tgt 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 requ:yhqpb7tn.d..5g d r kired to stop thet n:h.db75 pry.k g.dq 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, w0 re*d* s;(z9w /(pos;ehav+5 nnxj lbk6ycljhat distance is required to stoeaspv(+lxrc*o;lje0 j;yk(9 n h6bn5s wd* z/p a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a a +:p-ybh xp3bforce of 20 N over a distance of 5.0-a bpphx y3b+: cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal ctiw2-jdp +nk 1*r)eaeoat +k 9omponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. tat kd2*paok e9)-i+ r+jen1w 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 i ztdtz-fg ow( i,a: +c+kg,lem0*x. xznto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before,gzzi: +adt tmcz(+gxkx*f0 , wole.- stopping. What is the average 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 height of 7.00 m above a floor t-i ubhizf*hof;x9pkk b 5du d6(ls*30o a height of 13.0 m above thuk*zx-fdoki3l ;si5d*0u bb(h p9h 6fe 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 4.0 m long and r6jkc:ws,wd;.b 1hlgrler(+ uises 2.0 m. If the plane is frict;+w.w6sd :,(jrkbhucl e gl1rionless, 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, capg s8r6qbge+ v6 ;f;xvuses the spring to stretch 2.0 cm. What is the spring constant?b ;s 6;gvv6gpxq f8re+

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 charactef l1js;a,apz: rized by a spring constant of 60 N/m. How much potential energy fljs,:a;apz 1 does it 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 sprin3x4 (b5qonpr t1y gkuh;2vk1o g with a spring kq(x;on4or g vy5bk1 p h3t21uconstant 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 o(00e/ k lid k6wgynyn2f spring constant 40 N/m from x = 0.2ewg 2dky0 (k/iyl6nn 00 m to 0.25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressedn(-cyp .xs m2o by 3.0 cm. How much work is required to compress the spring an additionalp so-2ycm(x n. 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 res/yh ma6b:*uohdpc b fa q3t/vu7r:a1) t from the top of a 50-m high slope. What is the speed of the slier on reaching the bot mu: bap th/cqub:r6yv7f1/ 3da*o)h atom 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 t+z/e9;fai li crgubk 9;*ua7 off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction,r;zc+egi9a t9 kuif/l 7;*aub 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 fricti2u3zcw.cp k0u*ol bl+e;v3 boonless inclined plane. At the bottom, it has a spobewv2u03b l.;l*kp +3 oc czueed of 9.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above3aolnv1w s14c+daa s/ the floor, its potential energy exactly eq w/1a3 l14nasv+dcsaouals its kinetic energy. 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 with a f9k+*2 yqtct ;hp,6un+owjzu kinetic eneqn yj + ,f*o2 h;kuupz9tt6cw+rgy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetl/fcf 492egzj ussc+5ic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launchj9+csf l5e4g2/ us fzc 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 sta4n gaaq9:2uzgd 8nu,p rts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). ,a8paduug g:nz9 n2 q4Neglect 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 at a point 45 m abmc 83z,mlirr(hk/ zf )ove the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m (lhcr,mk) rm /8f3zziabove 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 abovv kxu * a2ey.(h2dkmgq;5gaxpj nf;+.6u:lkje the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m abq2g avpmx;:jl.f6nk+da5 h*eg (2.k; xujk uyove 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 tl9ctx0x p;q.;t 5,.mbk ajpoaz5 w4lrhe 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 the vertical axis andkpgu,ik0k11z7mc k/ y released from rest. What will be its speed at thk0zug, /7y 11kipkcm ke bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal xj7pqpv gk3 t;,cr6 a)spring with spring cons7qk6px )tr3agv;c,pjtant 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 ats m(r:3- kry god+ioa3 22 m/s, slows down her 2000 kg car to stop for a red light. What wors k(:r+dymio3a -gr3o k 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 betcd2,rwr) auo6z1(yqxh 7 aga-ween 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 -aaxaz rg)yr7owu(,qc1 dh2 6slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 Jibqt( *8 4lpxh,/vhqga ib:7s of kinetic energy. The friction force on it is a constant 0.50 N. How far will : */hbqx87ph lsvi t,a(4bqig 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 appliebzw+(hxsa m 2, 3vq6jgd horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is movedbj wqvms 26z(+xg3ah, 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 hig+yn( u9mks,axh slope. If the work done by frictyk am9,(xns +uion 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 and ris, ik5sf8ic-44wt*zkw wf/uac es 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of tiwf f,k8zs-4i kw4*u 5cw/a cthe 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 la)a-n fs5 8hva//k caizdh6/of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. Wsfa/ c/h/v8daa6)hlak n 5 -izhat will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the groufsoee4a5agy79*x9fr 5e5n g dnd with a velocity of 7.00 m/s. What average force of air friction acg 7f95eyexagd 5ros9*fae4n5 ts 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 60.0vdt/ 7j+zph.l -kg boy using energy when he runs up a flight of stairs 10.0-m high, inv jltd +.7hzp/
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. pcj)xu nxy9.av6d(07 h et0cm0 m/s. What power must be delivered njc 0yet6dxhmpac9 u7x (v)0 .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 used by a 1.0 hp motor that runs for 1.0 h:v w + 3ulrrhokc( 6fj.xlwv(n7mr 4u)r? (1 hp = 7vj+rvoxu lkhf)w rn r( 743.:6ml(ucw46 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 while riding.u 6fa-62axg ) wf8erde How much force does her foot push with when she is travelg 8wuf6a- afe)xr6d2eing 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 isb d k13hm3(dch4fvzj, the average power d4 z,vm3hh 1d bj3(fdckelivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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