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

1#

What is the correct unit of work expreus56d htqs0/rt/w+z)hjh 8r f ssed 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;opfo *md:hkd9c o*.d if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of jqbq+y4 +3u,w p9 (dkqpxzr9f work you dod fb(p+xwp3q qr4ku9 z9,yq +j

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 lif w4m 0 )xz1g ljf+ia)-jn;tofgted 2.0 m vertically and is being held there. How much work is being done in holding the box in j t0f fjx gna +mi-))l;4gzo1wthis position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity v3f3 2itto jkaoh/9m hjh81 p6l6pw4gcarrying a 10-N object, the amount w 9fjit3tp 6/p ojk4mva h128 oh6glh3of 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 lxm+ a ix) brsj)80.zjaifted vertically 3.0 m then returned to its original position. If the tjix ra.)z0 bm+s8ax)j otal weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object tmjgh,tco(l4r.ez1 6 l3t oc+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 straight41ob*dfvjc 0fd.m m ;7eoonv ( up. Compare the sign of the work done by gravity while the ball goes up with the sign vd1;. 0 oe4bo7ofcvfmd*jnm( 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 po.f:f5 t fdsj),hx6y.hwq8;v v dm1 xkdsition (F vs. x) graph, represents8dqh 5).ydf :s6v fxvk.jx1w fdh t,;m

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. xd6 i/ d+lrknrffk w7+2qy+ xg-), what represents the work done by the force Flfg /x6ywkdrik d r2++n7+f -q?

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 positivfsry:1jfe *fjk* aw6- e, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object' il//,fz;ipb/h /zam:qo0enl 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 obj 7,s7vay fx dm1s4ws9hect 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, a /jzu0cg xn(0ond is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that ofxu0z(g n0/ joc 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 carmbv8 *fohnq1t/s - 5mm J has half the mass of car K. The kinetic energy of car o1tsv8m/ 5f*-mhb q mnJ, 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 vg4ztpj( vz80qc(h,z back with half of its original speed. What is the ratio of the final kinetic ene0gp j(vht48czvq,z (z rgy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed oom )zj abb;k/5f 3wqb1ix; rgps1do72 f 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock'jobm bo11p/skz a523 dx;g)bfwqi7; rs 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.*5z/;fn uph ow/ apgj m/s. 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. j5po/; z wugp.hf *a/nWhich object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certae 8r) k(vulu r715cdydin distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skev(d 8y)5u1crl drk u7idded, 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 maspyv1+wk2nn r.u nc5 i9s orbits the Sun in an elliptical orbit. Neglecting any friction effects, what hapn2y . pck91unvriwn+5pens 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 prinl5n, ven rlmfx0e7.)a 0mr r:aciple.

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 uoc xz 60mk.j1potential 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 ae.ht9axyo/ncd*+01 55 v2jdy /nas 1wa jungrbove the ground. A second object with four times j2e0n u5yan+jy *haa rd/c/xn1t9v 5s w1g.odthe 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 of1lfis.etm -5 a a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the mta5l- se1fi .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 syuw nsr3afn*ri3, wk ;3stem

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 en s t,s6c*smzdly w/v1*n zh8prvz /;m-ergy K, to its potential energy ms**lhds6; ytvwcz/zp,8rnzvs /- 1 mU.

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 dueqono q4) coi*t (-;griving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy o hw6w3d)te r:mbject are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. : )mwrh6 tew3d 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 +3 5 nfy 97gacf5lxvfq$m_{1}$ 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 mehgib j* bj1c.)chanical energy for conservative forces. ic*h)1b. jbjg

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 buil j/qj2pi.k-7ti s-ffcding, through the air (air friction is present), to the ground below. How does the kine- i7/2c-sipqtj jk.f ftic 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 l 6e5jkk howa7ph r+j y.c+b);air resistance. How much gravitationa+cwbrhk7 je5 l+hj.6) k yp;oal 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 disr0*o7zvp z *;dudnun3tance and loses 30 J of gravitational potential energy. Do not ignore air resistvd ;*z0p7u3 dn*ornzuance. 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 conservatiol xe py*rb;jni5),k i:qbjx88n 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 is pim4koi ; skt2)bge(2wl 7*lf

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 SIe6(h5g/s 9+kkobyczk 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 power?bu2xf2 9i33 udoglaz7

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 sj2hub( sv2f0i 5*dsutime. To do so, your power outputid*s5 2vf 0ssuhu2b(j 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 atxihi846zbb2 f yu j.7v 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 object weighs 90 N, ( nlbqz62o 4xkdrl4+mdk4 k(p hdn lbrk4( 442x (6 mzokq+pdlkow much work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in s7zj;q kf6 d*kthe air a distance of 1.0 m, at a constant velocity of 0.50*d j;k7z fskq6 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N f for/nfpix:vwg 3 uv hk-;n;9(or a distance of 50.0 m. What is the work done by the 5500 N (fn;g ok 3f:viv;up/ rnxh-9w force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force 7+2pgmtsuguma( r 3d.wwy ts8y2;c0 eof 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevaa38c 2;ywgs 7ym(r.gpt 2mtude u+s0wtor?

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 Nn)rd 8)dbcm/ i 7zy0 8ilx7l5wx2kmhi for a distance of 50.0 m. What is the net work doniybc)in5k)l0/hi2 7 mw878 ddmx rzlxe 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 6.0ir n xyw vnk/. mv kd/*,fti7)rzqe1+- 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, inclin wnnib84lhwk +rk 6*q.ed 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 a sled on an icy surface (a crqpa3+,r7gjb7ywa:o72 chfssume no friction377ya,bcagp r+f 2 jr7hcoqw :), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an obj p0lwt6f h7( r6bzj:puect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posit6r0 jwpp(htb: flu z76ion. 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 o6- cbgjcm 6.qzf the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves f.66cjmcbz g q-rom 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 in Figvnsu6 4o;lia myu/s 4u2p mf/-. 6-1 shows the force versus the object's position. Find the work done when the object moves-nio/usu m;44m/asy2p vfu 6l 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 graphr9 xbg fcx:8mj 4hi/, 5wgea9t in Fig. 6-1 shows the force versus the object's positiox 5f/ eajrwi9 9xcmgt,4bh8 :gn. 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 applied to 7o,; qe1:u-fg6i--w beyhr9nkvbo jxhe g6 z.move a 55-kg cart (initially at rest) across a 10 m levelh;eojh.wf9,q-:en-1 7b- rv ku 6g b6iyxeogz 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 applied to move a 7huj/62iq5u7slanx p 55-kg cart (initially at rest) across a 16hnj7uups l7qia2x5/ 0 m level 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 requir(zvvd7zar q m63*,hz3 h0yv7 ra-efszed to stop tv7r f*zq-amyv6zrz za(0dvh,73he 3she 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 distanc9c/90* hnn:2tp3 lnxvdb 8z)b ng mfmge is required to stop a car moving at 50 m/s under the same cmg nf8 bcnmgt3)9x/bnvlpdzn 90:2h* ondition?

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 dartqll/e ht*+t 0m. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun mte/ t+*0qllh, 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 ;;g:41sg s muf)euxzho c9pnf8 /cmx0 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 the floor. What is t0f;m snugh9 xou:z x1s/efc ;4g8)pmc he cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, striking the hay jvu(hccxpllf/ajx7 , s( a.f5nx w .t-w4/,ry with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the averagc-/xrlsx(fc/ hnxa5j t,wv7 u(a. jfy,w. p4le 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 a2/raby 8o jsa4bove a floor to a height of 13.0 m above the floor. Wyr4j/a 82a osbhat 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 inclinedtq etz,my3 awwonpn; u49 wg.m1 ,)dc2 plane. The plane is 4.0 m long and rises 2.u,nw)n9m dyczaq,g1m3t24 pt .ew;w o0 m. If the plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring edmuz,/16i xn to stretch 2.0 cm. What is the spring constan dze/6xu1m,ni t?

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 s7g5 d- 6;xc9lbq wzl6fq1j3bz5)1y azpw dsg gpring constant of 60 N/m. How much potential energy57x95lz da b6;jggdqy p1 13s)l6q zz -fgbwwc 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 spring lrd- fuat0*t7 r; pxn3with a spring constafpta3 drrlt70-*n ;x unt 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 spring const+ iz.jp f07cvbant 40 N/m from x = 0.20 m to 0.0+z.pvj cb7if25 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 compressed by 3.0 * ,ch2c9yoi(dp f9mkpcm. How much work is required to compr*2fhomi py(9,9pckc dess 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 50-m high slopk uqc:s0rpf59 3v l.73po,7bb cu5s dlyn,oige. What is the speed of the slier on reachink7c,u p0g9o5d:v rsuyqlb5.pfolbs73 ,3in cg the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial sigu2jo,hxn 44.r a jn:peed of 4.0 m/s.h 2:r4 g ij.anoju4xn, Neglecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At the bottom, i.a,1 gpkkf5)2 bd rdpyt has a speed of 9.80 m/s. What is thekf1.,ra p25gkd)y bdp 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 abof2.b n(t3rl4il c y:aove the floor, its potential energy exactly equals its kinetic energy. How fast is it mo(l4o2tay3: nb i.lcrf ving?

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 ujjcr s3m /l)4x2v srsdq2* jc9p 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 vertical heig2m ldvcj*rj4ss3cs/ 2j)qr 9x ht does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220 J. At t qm qwotnhqdiup-g )m- s1z;(h8yu+9:he highest point in its trajectory, its kinetic energy is :m;1(u pi+)zymqugo- q 9q8shnw- hdt120 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 r5g +a azpn::i8osuo( kest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, w gpaz5u(s :on8: ko+aihat 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 e+rs vd1qu9f;i1 vadgvn5n6 0m above the bottom of a dip (See Fig. 6-2). Neglect friction,nd;v 9r5vufadng6+sei1 q1v 0 what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a poinz+jhe r1wv) wf0ek ;v9t 30 m above 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 ate0hwe9w)+; fvz kj1vr 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 tyhcem,yt)8 ub5ni.7w. lmd d. he ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 c(hq5ov4r5sc7ik 6 l lmm away from the vertical axis and released from rest. What will be its speedhsc m o54 l65k7ilvr(q at 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 at 25 mm/+qzm 5vth g7*kf+qp/s hits an initially uncompressed horizontal spring with spring constant z+ p* mgqmk+f qth75/vof $2.0 \times 10^6 \; N/m$. 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 dowzn(t 3xq)et+9yr ,qtse8d f/3uzwu/ cn her 2000 kg car to stop for a red light. What work is done by the friction force against the whet/+eq)et wnf3u3(, crd9/uxyzq8 zt sels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surfacet9qwpi- asna;d) wi ec rev)w538qa 6* is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming tovs* 9q;) )-nqde w c6aepw5rwaiit8a3 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 9ys6o v+di(ihxpa1 m. surface. It has 24 J of kinetic energy. The friction force on it is a constant x +ips ma(6.iovdy9h10.50 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 surface4z)awvk 6x)jdh2l1qj. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of6w2)a jjzv q1lkxd 4)h 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 eex-d hes0f3n.gzu h 7;fx*k;of a 50-m high slope. If the work d*xx.hnheu 0s z;ge- k; df37efone by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inze4 ac(s bfabh3a)r) 6clined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magn) f63) b4abschraa z(eitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined 1b ol6 k7b:-7ysvx ,orz+6 xsc ivaq-rat 20e above horizontal.s+v, 7 vqrsyox k -x1:rl7bac6 6o-zbi The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped *h+cig* k /g0tay6xvo from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on 6yk+/ a hgt*ix*g0cov 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 u4gbb ht3gjp(bxbd6 c;aic0r4 5);r xh sing energy when he runs up a flight of stairs 10.0-m xbajb5 )p3g;h4ird rg (x6h c bt40cb;high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an pj.qai0tuu+q1 l hj:p/iux 0 m+nd:0 hobject with a constant velocity of 5.0 m/s. What power must be deliver1jahu+h/mul0qj: i iptp nq 00:du+x .ed 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 energa cw rnn56,k(ty are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 r(cwn,5k6at n 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 Wna10u)a nv ;sc0uhk80ax w4 fk while riding. How much force does her foot push witan0kh0;4uwx ck a08fvu )sna1h when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What jm 0d0d8,v )l,rq6okzsrdm; zis the average power delivered by,m,0j6 mzrdo;8kvd0z)q d l rs the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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