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

1#

What is the correct unit of yh;v));d efih 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 is n yhq4,yh69jpio motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the a;7t k rdw.hc81/tts djmount of work you w7r/ tjs1dtc.;kh 8td 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 e:n++ ajhix txg0s.r4w rdj +0is being held there. How much work is being done in holding the box in this pw04+x0+:sn ghjid.ear+rtx josition?

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 constantey. dtg/m/h2 n velocity carrying a 10-N object, the amount of work you do idhe/gn2m t/ y.s

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 vertical4 6( 9rywlljyvetu5 f.ly 3.0 m then returned to its original position. If the total weight is 30 N, how4w(fu. 9ylty5 je6 vrl much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on mbz 14w a,lmb)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 wohyig 0g 2h+ 4/o7yy bii /;kpu7lldwh9rk done by gravity while the bh+y ighw; b9/2ld 7p4/gy0ihi uoykl 7all 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 vszzr(,r z 7a+f3y sjvy(d z)sn:. x) graph, representsy3rnza,z)zr szv(d :y7j +s(f

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 vu.e4h og(b *c7ydra00mbcbv;)mr a r.s. x), what represents the work done by the force hcrag 00ybd .( 4*br7vr; cbmuam)oe.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 obje63/bw gxph.ok ct 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 object is negative, then the 9q df+*8qhg7pso xjfx iu366eobject'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 orfz*0/9e (w yng.xeys bject 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 twice the speed of the ,3fl ((romn/1* glg:mp3ww htk dro1 ocar. Which statement is true t fm*1mo hrgwo,k(31loln3/:p( wgdrabout 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 ac:b3 fi;ohe5 8bit3xhas half the mass of car K. The kinetic energy of car J, compared to car K x3:fc ibh b53oti8ae;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 with ha7 qi z)b4 um22;ieu7cfju bfh+lf of its original speed. What is t )7jb2f7zic4i+uuqbf; 2m uehhe ratio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is -pdks08g0.9atm rk 1lw )ordu,pj7 olmoving 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 mas o9r)dp0om a.d1u7 0k-lw,prtjl8kgss?

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.1 p9y oe+;gacr A 1.0-kg mass 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 rep o9 c1+gay;distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distance o d*rgscoe ceul*98:- on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditl*ocd gs-u coe9*r 8e:ions?

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 ellip 6b x bon;70tqj3bj,cutical orbit. Neglecting any frictib0cb ,b 6jxoqtuj7 ;3non 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 principlez03u. z jo*sol.

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 :8z ez bt*zz.(ayn f;(+ycpyt 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 objc(t +/wcd6-5gq h 2jhvus fsa4juw1/fect with four times the mass of the first if re d c5 hf1q4/hu2g-fu6wvsajc +wt/(sj leased 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 sp :g rp q85d ;ab1mpzh.ny*twk r83g*qpring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spriqrygp;.qh3*5:8w k*a rp 1gmnt pd8bz ng, 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 mechanical energy of a sysqw7 npy183k vitem

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 treedivu(m s:u;ky e py)(7. Compare its kinetic energy K, to its potential energy U(i)us;mykuye7:p ( dv .

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 hj6hax-41k ndbk8 maj. ill.

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 wk 9eub r i+fqvut7/+36lfd2hzith equal speeds along a level frictionless surface. They both slidtv/ fi+7 9dberufh 6+3q2lkuz e up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses :fd mv.n jji- 5k8uj7w4vgiudy0 (op5$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative 1at dxi,yrg6y k: ;gc+forcesgt r+i,1y x:dc 6ky;ag.

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 0oo odf 0;rba4air (air friction is present), to the ground below. How does the kinet0fdbo0o4ra o ;ic energy (K) just before striking the 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 g.9 0ev3xhk tk5o q) bgbq4t:j9, fnwq77dukkair resistance. How much gravitational thkkg)7 :qw4v5, n.jbe qt9du g3 7kxfb9k0oqpotential 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 gtive -5z:*bfrbiuwd dk*rlc 8 .,ay9(ravitational potential energy. Do not ignore air resistance. How much w-8:zv*dbku5brla , .9 e*ii(c yrtfdkinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of energy.pz ccw*v)sccw ,d/fa -)u;j3n

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is *f7 +g+iqlfiv

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 express -m-:o5s,txvi swn8u tgjc- ;jed 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 is not a unit of powe2ghl)reye7 fs*n cb3( r?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time.ke8 .zx r0ogfflgh )i*9n;f8 s0 .bsrb To do so, your pobfk)0.rbxn 0;sl8i z*fgse.o8 fr9gh wer 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 accelerau9t .h2uk5bjm8 hhn9adpj 3o)m 6to 7jtion, 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 object wk m 7jto+r0wk7(un;hfeighs 90 N, how much work was done in lifting it?( mfnw +0o;kj t77krhu

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 aireq:+ qt fiwse 5,v87dh4kh+hh a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the we:s+fwh7 ,eih h dtqkev5qh48+ ight 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/k 7.tj8uk bvo)*spwm upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N for )jwp/tkbsvm*.u8 ok 7ce?

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 con+ak* yx3)a p-,mk0gx plrs (ag1ki9i xstant force of 5500 N for a distance of 50.0 m. What is the work done by the weiig l0 a,xkkm+a*x-yria 1k( 3ps9)pxgght 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 wit 8+noykn4tl ,w51 ,oovt0taa sh a constant force of 5500 N for a distancentl+tnt ,s04va,8woko1 aoy5 of 50.0 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 6.0 m u ekaf: p3kla/.p 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 shnqaqd,(9-/eshvxda: 8g/ ekyf - ph7 lides 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 + x k 3dfz)6av2euu3gqin a sled on an icy surface (assume no friction), with a force of 60.0 N xezf+2q3ka3u)6 gudvat 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. T:z(/ert.lgw:ff (9i4oe bioh he graph in Fig. 6-1 shows the force versus the object's position. Find thw9 (zgfrfoel: iti:(/b .e4ohe 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 tre.9fm n 4cx6q2aan. the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Finn.rn2 9te 4aqfac.6xm d 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 force. The graph ini1fjnml4196qm-x cg 1j)fbkk Fig. 6-1 shows the force versus the object's position. Find t41b kk- )6i 1qjmx njff1lcg9mhe 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 obj m8z*gwgsg4u j52 xle/ect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the woejl2gg 5wxz4 sm /u8g*rk 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 rqm ;w y; jm;u*1imu,dis applied to move a 55-kg cart (initially at rest) across a 10 m l ,w;mu;j1qd;mi yrmu* evel surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is a5)wipcip4e6l) i; s ycpplied to move a 55-kg cart (initially at rest) across a 10 m level suiy )wiie;46c5)l cpsprface. 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 required to stgo)h)ci(y ni4+ )hdxoop the mah4 noch doi)+ yg)(xi)ss?

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, um* nvc*7vrd 4m)oxb)what distance is required to stop a car moc))ndbo mmx7v *4*v ruving 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 exertinynog 1:n2eq1 ujh c5,xg a force of 20 N over a distance of 5.0 cm. Wit 5og ,1exhcjq2:u1 nnyh 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 compone.b1 g t) el8cwko-1 dwb-zcni9nt of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along ik. 1 8wdcz9e1nwc-)ltobg- b 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 horizonao(dy8r6 jc/sr ibd+ 6tally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth od6i /8+ajc sob dy6r(rf 20 cm before 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 fr ud 1bvujoe7,0ims83lom a height of 7.00 m above a floor to a height of 13.i0 8u3,7lbdv1 umos je0 m above the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined a*gfd c:sbtx5nc0k,p e;e 9.c plane. The plane is 4.0 m long and rises 2.0 m. If the plane is fric9tc bec0 eng;f,sa.p*xk5: dctionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 w.tv6pkry0o 6 cm. What is the spring c6ytprow6k v.0onstant?

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. H)u; fk acn1j)hqz85:a ,yq pdqow much potential energyhku1n 8c ,qfjya z:da5pq))q; 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 requirw/ff;)+n0kt0kjwn wn kid40 ped to compress an initially uncompressed spring with a spring constant of 25 N/m bykdf0w+0jnk/;pww)nf 0ik t4 n 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 sp/ r /oh dqx8)doysn1r3eq ;wn8ring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at q)e3h;x1 ysrwn doq/ /o 8d8nrx = 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 ,1ezb/; :r1qlgcaqcwconstant of 15 N/m is initially compressed by 3.0 cm. How much work is requi ,1:arg/zb cqecql1w;red 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 the top of a 507fmvf:ep2d38 qgta2 l-m high slope. What is the sg m va3: fpq2ld7et82fpeed of the slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill witho1uo dn 4e/d,o9dzh 8ke3vqg. an initial speed of 4.0 m/s. Neglecting friction, how fe,.neoz89u4ovq ogddh/d 31 kast 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 downxf3m(ek965), l.bbxrt0wwc 8mf tjd kv7l q 0f a frictionless inclined plane. At the bottom, it has a speed of t )xedk l00 f 3bcwjbmq9m5l 7kx86trwfv.,f(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 above the floor, its p mgqjj:v2dnw g34t y+80)gmx xotential energy exactly equn+:jmwq2yjt3gx d g8 04mgx)vals 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,0v; jk4hw,kq u blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 10;u,vqj4w kh k40 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 grou *opru4q 75ixmr;srs8nd with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch o r8qsprxrs mu5i 7;*4point, 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 point8 tyw(c uq2we7sa(yu 9 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wila (w2 y8 yuce(uqs7tw9l 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 w2e q0 od,3v4q/leg ,c/qipy exith a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed o3,,e4eq 0qe gd /oyx c/qvl2ipf the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above thezl+tcvp9qut if,h ts*i+g2: xm)*j0k 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 above the bottom of th i20tizmsktx,:+qvtf* lu*gc+)p j9he 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 swgf7ultt z3ddva *9b;2dim4, jing (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 verticf sz02z6qz 6qmal axis and released from rest. What will be its speed atq fz 0qs66zzm2 the 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 atz. o;r/d)np7z / xaonu 25 m/s hits an initially uncompressed horizontal spring with spring ;z/orp )uaxz .7d/nnoconstant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red ligtmdiyk5tl-+ zhl(t : .ht. What work is done by the friction forcel mhil+tyt(tk-:5d. z 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 vctz d6 :bl2xgj(*1h bobject and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance wil*:26xd(gbh1lb vtjc zl it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface2 g,x-e yxude1. It has 24 J of kinetic energy. The friction force on it is a constant 0., e-yx g1d2uex50 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 e s2z3.abpbd; surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is movedad.pz es3bb;2 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 slopem.wr6i rq ai7-. If the work done by f7iiar. 6-r mwqriction 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 pl x/lboif132(:gspuyi ane is 4.0 m long and rises 2.0 m. y( u: b2i3g xpois/1lfIt requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top 2;k:,w2prqa(uvwin tof a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding w v :(t qwnp22;ruai,k4.0 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 n)eq4ny)n3a u m, and strikes the ground with a velocity of 7.00 m/s. What avea 4ynqu) ne)3nrage 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 energy when he runs up a flight s xvm9 cs+csyu /): .zu5;n*tjwmbyl6of stairs 10.0-m hi)/mz6uv9*ctb.ns+cw5yx: m l usysj ;gh, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.ti3 2 qb:npz:y/;ki k4x 6sdzo0 m/s. What power must be delivered to the obj 6ozktiq; 4 :23sbyx:d/nkizp ect 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 ejk9b.l pru. fk 91s*sqnergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = j9*krlb9 s.qf s1kpu.746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 5i9 ors)d4ftgvif:f ,gt .0cl W while riding. How much force does her foifrsdf c9l:otg f4 5g., t0iv)ot push with 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 mavwpi( q1eb *. -;y,ceam0fd/s in 7.0 s. What is the average power deliaybie q0.e dw;,mf1(mc-p* vavered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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