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

1#

What is the correct uc/6j+ h/18 wz yku,b:nbuafzz nit of 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 abowt--. ; (jthgca ;un system 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 sukefcxu 6.z) 0gj0m5t tationary brick wall, the amount of work you do0f.mt5xku6u cj)g e0 z

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is d8aiyj/y.3;m eq6cp+ xbn0 r +g2fhusbeing held there. How much work is being done in holdxub62 ny3rmcq0;hfadis pgj/8e y.+ +ing the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constanta ra/qahl.s2rt0jz; , velocity carrying a 10-N object, the amount of.aqz,tr/2r0 hla jsa; work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted ver+x zisxcu b -vle0ws(cavtk 6j-k:*;2tically 3.0 m then returned to its original position. If the total weight is 30 N, how much s0 6x c:*e-kcx 2wkb+j-liz(vav;s tuwork 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 amqb6oq,;u r2 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 w/v d9d1wt,e3ij my:w of the work done by gravity while the ball goes up with /ey91wwt d,d3 mw :ivjthe 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, o xw +soc *:krc4(gegu( 487 zk/vyvont g2d7gyn a Force versus position (F vs. x) graph, representsv 77g c d84xcgyw( u*o/ 4:k+soygv2nzrtge (k

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 u ,ez1-4; rujhipdnf9 position (F vs. x), what represents the work done by the forceuiez 4dj f1 h-r9,u;pn F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; mv^2$ is

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, qrn.pve6 *u/yd*4q4f)jvuxs 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 negiyy)4eb0uc p)ative, 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 th:(ol mfq) iw8h63b qzje 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 movingvakf9,808 i6b dhztlfyg3y0 w at twice the speed of the car. Which statement is true about the truck's kav fg0y6wif9h8 ltdyz83,b0 kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of t( 1i2arfybw3 kqkm0+ car K. The kinetic energy of i02f1wkb3q +a( ky tmrcar 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 with half of its orig7 z09 r f-meo +yyxpqwxnv8ji6:io+w +inal speed. What is the ratio of the final kinetic energy to the in wxqjz+v+9oyyin8:oi r xw0mp-e76 f +itial 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 of 54n mw*a:palt37 n ef7w m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to :a n n 7*e3p4mlwawtf7the 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.fz.1-38uxg) lduv- px (op pyj0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brougyx3.-f x)l8pp1(vupgzoud- jht to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, sr62 zf7 2h8gojums i4and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car fhmr248jz 7i6 us2g oshave 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 an5x9 d t -6nfn5hzwb5orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happenb6t nf hxza95wn-n5 5ds 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 princi) p9gs07ydts;hpuk pl 6 5tg.bv, 1aqiple.

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 potentiz4b mtgp*iy -/(bh1gn*byc/q3/b bqnal 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 amyr k:7xz:p6; q ycxe6bove the ground. A second object with four times the mass of the first if released from the same height. The potential zkxp m:7re ;6qy6y:xc 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 o1n8w cc3be8v of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of enc 8vo8bcw31the 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 eneruwse8at lz; :kq*x5r8gy of a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energcnkgj-2.s v)m y K, to its potential ener)m.cn-s kv jg2gy U.

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 dri6 m pv55 f,thzv: *hr*syxpk4pving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are ). 7ayct x5 hg)oi)n-uvwyx -fsliding with equal speeds along a level frictionless surface. Thf) c-7v t)uyx.n-ixg aohy5 )wey both slide 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 eaiiasr/j/ (pb s-2g /$m_{1}$ 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 conservatut qw/0gn) p ;kls0mmh+xiy .er ))3gmive forcesu pig ) .)gme h/s)+w0mq3yl ;xrtnk0m.

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 to3**wks j ny3rv/.j8 h2z qcy/1thqysep of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?8 2yztsj.qj/ vk/w 1ync q33eshr**hy

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 g u2h 0 be3jtce*n(;pcignore air resistance. How much gravitational potential energy did the ball lose?e cu*n(;bej p2g h0ct3

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 gr9x9b-5po,friq . u ccqavitational potential energy. Do not ignore ac.xru9i5fq,qb c p- 9oir 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 conservatf b3lv vk83n;mion 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 7d8fcmt 9xry/1p4+oq a szs;l

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 in9 zi7dzkel-6q 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 u 1g0i7u6hi+se i ggp.da o9r.xnit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-thirdfy.,b y hks6f6 the time. To do so, your power output must have .s k66,fyfhybbeen

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine musdk iopxtjkw7 2:o l 8 xk.t 2k,nh7wt5ag471utt

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 hbj(e./ fyjy6ok: hyq7ui4*zceld there. If the object weighs 90 N, h:q kyoez 6b.jji7/fy(ch*4 uy ow 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 the air a distance of 1.0 m, at a cons l9i-djo* yzln2+mj,gw nvl+ mt;ar,1 tant velocity of 0.50 m/s. What is thjlln g+-,a21m9;m iw+l tor ,zdnvj*ye 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 conm u*1ld c1sn u-jv:tc,v cx,t9stant force of 5500 N for a distance of 50.0 m.ct11tun,v *mls,c:xjvd9c u- What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a dist;el msq7(k;9mixiqd * ance of 5qkm ds*le;m9( iq7; xi0.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant fv gt3sry7b)4 aorce of 5500 N for a distance of vt 7g)yr3sa4b50.0 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.x* tqoz2 1kj:,-a(r-lrxouyt 4c)n yx0 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, xyuy/t c6hpbc ;la)g-8 -g ua)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 a sled on an icy surface jvkx1e 9sfl *: (+mm00spny ),x bdoey(assume no friction), with a forceos)fenvy mmb1 exl, y *d( kx9:+sj0p0 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 o lma1yef6)v 1of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 fem a1 )vl1oy6m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fo)vbe vh3 45q ktx j(5-6mfujjvrce. The graph in Fig. 6-1 shows the force versus the object's position. Fij4j55exf vv6bmj-( h3)vkutq nd 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 di66l9az7 ehya/ y6pxi irection of the force. The graph in Fig. 6-1 shows the force veripy 6/6za7ly9 e axi6hsus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direjmv+ .ljj,a :kgt1+i tction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the og:javi+1jjlmk + t. ,tbject moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg u.guy,u,ko+wek q;f0(iuvy -cart (initially at rest) across a 10 m level surface. What is the final kinetic enu 0.v ; yyik u,ofuwg-,(k+ueqergy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-k nq; hp),l+i,n pozf2mg cart (initially at rest) across a 10 m level surface. What is the final ,)pi o2q;p, +mhnfnlz 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 e4-f9, bkc wamwork is required to stop the mabfa- ckew4,m 9ss?

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, whaykut z54qd l8(b.rcru;4s) q (hyidwkc;sf/9t distance is required to stop a car moving at 50 m/s under the same 9r dubt54; q(kc/l 4iyrz;(8fkdyh.sc sq)wu 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 dai j9oxs00i5sd i2+xwlm358kbnfyz .yu0uf4trt. It is cocked by exerting a force of 20 N over a distan0z3kf2ub4 n 0ulw xtid80s 9ofyyj 55 iixms.+ce of 5.0 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 horizp + vqbr-c; djwom.j2jp h0+.kontal component 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 startsrmv +;.w.p0jp2ojj q+ -khcbd 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 pu fhd13 /zeysijh3j*2qj*u9 nto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a dsq 9 p3d/ujh3 jzyhf*e2*ji1uepth of 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 from a height of 7.00 m above a flo lst.7t e95i6vd-j z bninqu:f;6h2kror to a height of 13.0 m above the floor. What is thdf n-97b u;q2v tek5s.rni jlh 6tiz:6e 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 plau 1vszj22zmp 7j*ikp gqe; hl. /)yva.ne is 4.0 m long and rises 2.0 m. If the plane is frictionless, how muc*j v2;2/mspju i.z1lv.qgaep) z7ykh h 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, causes7u 6ypds24f hh the spring to stretch 2.0 cm. What is the spri shu4y2pf6 d7hng constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring3h qwuak/57a;w fdczy4*:ezvy(zg u 6 constant of 60 N/m. How much potential energy does it store, whe /uwkyzy3aqdvhuzg 7cz*4;5afw e:6(n 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 coc gmd kr9 z-:zc6-of- mr;mjw;mpress an initially uncompressed spring with a spring cokg m dm 9-czc6rfz;-wr:m-j;onstant 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 constant 40 N/m from ddhhn2-9 ij.dx = 0.20 m to 0d h2.dnjhid- 9.25 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 initiajx kvo,lbpvfa*ju i6tw1 l1s*2 w*d; 8lly compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cu2i 1w 8lx1 *pobfldtsakj6*vv,j; w*m?

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 5)fod.oekc tbiz-l*;i 4 z2sp.0-m high slope. What is the speed of the skier on rb ;*ft2le c .d.4zo) ioz-pikseaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off 5j68(fnawi hvgz5iz:the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast fa8vg j5w65iniz z(h: 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 fr5y4 vwdc*t +f4y4jf-p r7jgzyictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the p pf4czg-5djy4y +7 yvw4rtjf*lane?

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 pote3 uq t-)scn ucs)k9qt3)jo 5dqntial energy exao5 3jku) dqn9)c su3cqst -qt)ctly equals 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.(ot mpbr(r6rm te/xj u2 /sq+ ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical enerubmqmt sr2( /( j6xr.t er+o/pgy 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 c /uac6 qeeojr5+2 :oza kinetic energy of 220 J. At the highest point inqe +6z/ or:o5ejuc2 ca its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottomew gqz *b9 7pre mf)t31ifda:2 of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coas re2dz *qb)mgewt fi391 f:a7pter 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 sp,nmmpe7t o +6q 5bmx2 8cjd5t+8mwmyq eed 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 of the roller coaster at the t27j5 dyqtomm6qc,n8w m+mt+ 8m5p eb xop 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 aboveij d w1m0,die+bnr03e bnubj2 -62cej 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 above the bot,jrdeujj+ib 0ei2 nb cdwn- 601mb2e 3tom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the lpw, 4gi6wkc*ih6*f x 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 2-kg pendulum of length 50 cm is pulled 0.18 m away from the verti; xdum3 47n(r: 21zdytop pkthcal axis and released from rest. What willdhnt yd pztr;up:(3m2 47xo1k be its speed at the bottom of its swing?

A. 0.243 m/s

B. 0.649 m/s

C. 0.973 m/s

D. 0.811 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 initi: lfm*h;v6pnr ;xo,qlally uncompressed horizontal spring with spring consrqh:6lmp;, n;f vx *oltant 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 r2os6f +)m, tg5zhobo,ju) i;fcw noq 7ed light. What wi,+6 fons z)cg7moufb,tj2 qo oh);5work 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 betwee 1defieca 8ed-bt -4:sn 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 slide before at-ee d: e4is81d-f cbcoming 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 2:/n 3ha0gjjp4yy2ma:yc/ k ne4 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it : /yy jgea/4 n0jykn:mca2p3hslide?

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 ave71wykckjz.v 3) 7ha 2.0-kg mass on a level surface. The coefficj)ahczk.yve73v 71w kient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If th xvk7-*mzyan 09hf/0 *w nlikve work d*ykxfh9n /ak-0m zvv* 0li7wnone by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m lp i.odo:t39zyf 922d8 py hqbtong and rises 2.0 m. It requires 3200 J of work to get the box to the tydqhd2o:tf2t9 z9.8 i3ppboyop 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 of a plane inclinehn. uib6; dx8wd 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 af6iw.uh8xn b; dter 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 qkwav2e(s q1m,/ ihu1ground with a velocity of 7.00 m kq( q 1se/aw,mu2vhi1/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy ugk cghlj9 h.,ph,p;9wsing energy when he runs up a flight of stairs 10 kjchwg.,;h 9,pph9 gl.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to movb))uhq/. u*r.ir rvcwe an object with a constant velocity of 5.0 m/s. What power must be r* hurrwb.u vq)c .i/)delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0, n /s0gm /bk3:sqhopo hr? (1 hp =nq,ks //soo :m0hp g3b 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 W while riding. How much force dq .un6jee8g.foes her foot push wen.e6uqg. 8fj ith 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 dubh-5ltgcx:4gz q*08hi( od 7.0 s. What is the average power deliverx b8d dh-0(5h:ucg*qi4gzlot ed by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95