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

1#

What is the correct univ *ej3o y88sw wkjbk3.t 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 a system if there sb8r. y /ioz0zis 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 againsd/; 4-/e z3yqvlm 9bnw)rtuart a stationary brick wall, the amount of work you d -za/ rlw/mbun ydq49v)re;3to

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 being held there. How much w 2guc5p/abvy 5ork is beingg5 v/2apu ybc5 done in holding 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 constant ven4w-sa ts.+tj 9i 8)9xy coxxxlocity carrying a 10-N object, the amoun- oxin+9wsxc49ttax ) s .j8xyt of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is li3u3z8/o cv26ig h2 c:twndglk15ctomfted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much woc ou3dk vt6/l c2w85ti31ozc 2mnh:ggrk 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 do work on thk-f y3gmsnbf6- fr6s 5e 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 ub 83tnc s2ckilo-f.dhxu7 bwnh,n0o) v ; 4av/p. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity whbu o2h0w3n/hs) xlvon ti;d8 -7vcbf,cka .n 4ile 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 versus3o o r1nofd8vf(ui1l 6 position (F vs. x) graph, representsd i6fv1o1olur(o3n8 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 vs. x), what re brh;; hdv) v4qeub-j5presents the work done by the )-;uvdej hv;b 5 brh4qforce 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 obje 16f+ce sqo 0wh p6guosj:e,x(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 object's kinej.c seu7k5vdx(e) v:rtic 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 thecut(wqeeq a tgm.3t-gc (l 7:/ 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 t*yrmgl7g(8e: v:u1sbkl)xn p wice the speed of the car. Which statement is trupsx:87v g *ek )r1l(:ybgnmlue about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of i*;1oj /3z zmyfdfn0bcar K. The kinetic energy of car J, compared bfm3zyfi 01no*z/jd ;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 b5r2x7sj kf k ozk 792ia bcv0xnlv67;qounces back with half of its original speed. What is the ratio of the final kinetic enersn7zb k2x7o7v5lakqrji 90 k f2c; x6vgy 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 speedc37umvon w i:uyx ;97w of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to 7y:9i;wwxvuon m c3u7the 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 1.0kr 5u ;e.y;h (pvpyxcet*ze,agl3x8. -kg mass is moving with speed 4e veue(p. g,t3cylxk8yap xr;5 ;.h *z.0 m/s. Both objects encounter the same constant braking force, and are brought 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 brake)qxoqeqt 4y2:z jm79 ( nhjje 2ple0d5s of your car in a panic, and skid a certain distance on a straight, level roahzxnqo pq 0927 2)e45j m djy(ljqeet:d. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in uxtz+ ,.b ;omkjp i87tan elliptical orbit. Neglecting any friction effects, what happens to the planet's kineticju7o8. mt btp, ;+kxzi 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 pri pz9yz+u 19yohnciple.

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 ene+vmbx-* ebw(m rgy?

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 abov yuqw65digpsd2jdu8 0w))wb b,tn *+ ce the ground. A second object with four times the mass 8*s yddw wj ,)0b5qbc6uigdpu+wnt2 )of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretcx9bbu/ k (we+uh 5.0 cm. If anke (u/ 9uxbb+wother 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energll v1dzk rgnbpms(hqm8;-7,e j 2 3)jdy 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 energyj0t tpfr +1vm. K, to its potential energy U.rm.1tp +0ftvj

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 c6s22 f.hb5lsifmf mgw.h, y-rar driving 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 vg9y6t)3vc7rn s c ,gmand a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide g3n6m sctcy) g7v ,9rvup 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 l p :dh,eh 1j(syzq;ne:d9n4w $m_{1}$ 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 wwp eg4j+3. ,aqf 5feeconservation of mechanical energy for conservative forces.+. 5jfwep,q4wgeaf3e

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 aiddoi3z. s kw87r (air friction is present), to the ground below. How does the k7 dswk8.i 3dozinetic 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 igno(u4q j+y/ qefa9(,j mhnmyxe/re air resistance. How much gravitational poteeqmnf(4yq+(y,9 hxa/ uj emj/ntial energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potentialur57nco , drjg )c/tq0 energy. Do not ignore air resistance. How much kinetic energy did th5r nr0),ojdq/u7ccg te 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 conservat ;bu5mc-3s1to. a gy)xw 4agltion 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 isgissqgd f jmb2y,0/(4

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 ex,cdn*lm f1q(pxkax96 lx ve9e 0y:m -n*a(dbb pressed 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 isq:2iiou muux kzu981/ not a unit 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 woz jg -,w2 tb2hjel(yc/rk in one-third the time. To do so, your power outputw 2 -h/(lz2gjcte ,ybj 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 w0 tl8x7jadb: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 (jlq z( ,8ptifand held there. If the object weighs 90 N, how much work was done in lifting it?t8z,i p(fq( lj

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 boo (-*v h lj*vupu;-uoiuk up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the woro*lv uuu;(*jv- pihu-k 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 for a dist/yx:, mii+s0ntw ywvu i /2vi0ance of 50.0 m. What is the work done by the 5500 +imyuv 0x//t2 : i,ywis n0vwiN 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 pulledy7 d8 jvy;tg3t upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the ele3;gv dt8y7jy tvator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N ff2w 9ufda/9v bff;0.mso i)h4qin+ iu or a distance of 50.0 m. What is the net workff2n q.+h fs 9) 0vfioib9imu/u;awd4 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 up al)t* ub (go;oeac4hh: yong 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 slidem y)6w/ jdx3kns 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 Sar jod8 ;vk nay8p+dw,x)ah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anw nd,+x;jod88k)a pyvgle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The g ajk:iljcuy3kjjs77 c :7 7i8graph in Fig. 6-1 shows the force versus the object's position. Find the work donl 38ij k7ikc::j7guy7s 7acjj e 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 th au+ w;88kfepw+ t4kbhe direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves frt8+wk 4wf; + ekubhp8aom 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 Fig. 6 j l(:v9-az)96jm;8 i) sgz-wvkr pzdvudsk*y-1 shows the force versus the object's position. Find the work done when the object moves fr d(:jzsa zv- kz8 iw)uv sjrpg- 9;k96l)*yvdmom 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in ke(a*dtk3xb+ n;k k:l Fig. 6-1 shows the force versus the object's position. Find the workk*e t ;nbd( l3kka:kx+ 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 move a 55-kg cart (initrmf4edw utwz(e)(t mt e6 7-6pially at rest) across a 10 m level sur m w- tdewr6tt(7efpu4)(m6 zeface. 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 55-kg cart 9 fh fcxkfxy ,y+31 l:yz0.rnq1u7mot (initially at rest) across a 1yfq hontum:xzr9f0yf7y+l 1x,k3c. 10 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 5.0e,jm6/th/-c *bjij fh m/s. How much work is required to stop the mas / mcijht*-fbejhj6,/ s?

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 cnm 4msck((n+ *q1xtlwar initially moving at 25 m/s, what distance is requitq+xs4k1lm((*cnnwm red to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dciigvaip 8:.a9 y 0/gae* e(mvart. 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, assuming the spring has negligiblea eg/v.*0gm:9va eiai(y 8cpi mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vert(u+sgv:yr *0 s i6vrexical 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 flooruvs0 rvx*irys:g 6e(+ . 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 into a bale of c,xk6 uw3+on urnv3x/hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What /cnnukw rx,3 x63v+u ois 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 poez .tc+k3 y ea4-zeb)8,njvof 7.00 m above a floor to a height of 1- vzc+ ea).e34ytp kbze 8n,jo3.0 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 plane. The plane is 4.0 ,*rqml8x6 lbc zi* ipu+0w yc3m long and rises 2.0 m. If the plane is frictionless, how much work was done by mcp3 b*i6,* xr+ zylwq8icl0u 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 springcz8g ef5op1*n sgbqw4rz /)x-, causes the spring to stretch 2.0 cm. What is the spring consto 8e*/czbxr pw 1-s)n5q4gfzgant?

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. How mum)8ml f0q yw7vch potential energy does it store, when stretched by 1wq)yfm7v m l80.0 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 uncompreej)hzy1 6c8;msipd bvq; 3 zu1ssed spring with a spring constant ov3 y j;)q1hs ipmb6 z8uec1;zdf 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- ug-a e3vxcd.6 qzj6d constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)x-.vz c6-adu e3 g6jdq

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 spri,3s6on se9yuh9tus56wk+ v lmng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required m slut uw6yss9o96k+en3v ,5hto 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 50-m high slopesi5(d, w + f8ffogbx2p*,ajje. What is the speed of the skier on reaching tb egf dpf25jsfa+ ,w j,i*x8o(he 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 ksl1 6 p0mea5uig, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after d sluie 51pm60aropping 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, it :ep,n2 l:lm gsoxm eyu8ba90f) 1 cu3whas a speed of 9.8oe,)3fswm9ulg8:1 m2anyc 0ubxl p :e0 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 d dgn,s;k1i1v potential energy exactly equals its kinetic energy. kvg11n,s d d;i 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, blast+blnc*5y r -nrs straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total me+* -crbl5nnyrchanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220 J. yfj7h: 3wh s uo9nw7,d At the highest point in its trajectory, its kinetic energy is 120 J. To what verti9d7y ounjh,7h3f sw: wcal 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 frojfeg bo fefe*3 p0;2(rm rest 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 top of the next slope, whic*e0fpgoejf bf er;2(3h is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 4 t/a2n74v vjlg5 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope,vvn a7jt2lg4/ 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 starmqmf;kr4 77t w ijq9j8ts at a point 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 coaste97ji8m qktr47mfwq ;j r at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the bats: 4qns,qfs :7uhhp f* r1f;gll 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 2-kg pendulum of length 50 cm is pulled 0.18 m away from the vertical a3l2:ioya m qg2xis and released from rest. What will be ito aqy2: 3ilmg2s 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 initially uncompreh4 m ekn(lr*i2ggm.)essed horizontal spring wimi4 hm*leg.r (e 2kng)th spring constant 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 /x8flygli0 hpa0w90 d:se f.b2000 kg car to stop for a red light. What work is done by the fgysl090x0a w 8 hed:.lf/ bipfriction 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 between a 60.r8o*2 4n( r )(kvd+gd redoojk0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, whadoj k(o )4odeg(v2rdn* 8r+ krt distance will 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 surface. It has qfl )d)hb7wl 19gj. yi24 J of kinetic energy. The friction force on it is a conl)j qh7dwybilg)f1 .9stant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a le;wcd j8r,q1u qvel surface. The coec1r jwq 8u,d;qfficient 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 (sgjlr1e +oy2rest from the top of a 50-m high slope. If the work dr (+ole21 gsyjone 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 long andplo+: esi4zr:jzq0:i ki.p3 u rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitudz .ipp+ u:ke:rojs3i4i0 z:qle 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 ofmh*t 8 yw oj79f*rl e8vapv);zq7zrt5 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 4.0 m along the plane?w rr petv8h5atyqfz o*9;7vm)8 7zl*j

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 ground wicg wmh v(hndg 5aelz*) 7,ge5+th a velocity of 7.00 m/s. What average force of air friction acts on it as 5 cgvh*+7gaewd,nl( zm5)he git 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 u;nkow;x .q x hcyeut.,;(:fa6k a s7lnsing energy when he runs up a flight of stairs 10.0-m high, ih k(xna c67;xq;,e tful an:.;owsy.kn
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 t.fi77frhptc 9r8b: z to move an object with a constant velocity of 5.0 m/s. What power mur8 ic bpff:r77t.zt9hst be 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 hr(:aq xqm. p/usgyy,x m4v0s2g? (1 hp0m2g:s qvay/x.x(gpqy,ums 4 = 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 th.zn b2osy;m s;mj /0yre rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 0rs./mzyyjnobms ;2;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 2* m09h oz,qhpp :q.6msj s,iqs5 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 70m hm6qssq,qs 9z:i jhp,.o* p46 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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

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