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

1#

What is the correct unit of work egl6h 7-frwf5 k lkqs+,3 kq4kexpressed 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 l 3c,:2difg 77d xkr(wj f9mxiif 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 wk.zdt .*.vnhlrn;6u3 scwii / ork you dlid/.n;.u it6vknc*w hz.sr3o

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 verticall )vps.g+fe0 5(vy6bql:dyg z ky and is being held there. How much work is being done in hg56q(ves) .v f: 0yldkzbpg +yolding 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 vee +)ez, 6ga jgqhi5:bklocity carrying a 10-N ob) qzeg 6 5ajekh:i+,gbject, the amount 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 lifted vertically 3h8 h5t13gj exc.0 m then returned to its original position. If the total weight 8hj 1g35xetchis 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 actn m*ea7m)vy4gzt7 k r3ing on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by33py b3ba1addi;iik 8 gravity while the ball goes up with the sign of the work 8i;ap3 b 1yiiadb33 dkdone by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) graph, representsaucn; 0/bw o(thsog,bn js30m.nhs7*k: fe (w7fb:ht,oc .wj;/s* mse(uawb0ngh(n o 30k ns

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 vers sgeg;jn0e.ny *,v au2us position (F vs. x), what represents the work done by the,gsv*0 eaj2ug y.; nne force 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, then te -8ecw1odg*k *l.wv: dfqq 8mb2a.tjhe 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+ llxx 2ug32hr 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 the object's kinetmiuyq8j)*cuw(r; f).zg : zrwic 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 dnnhw95 7oncjrj.,cc d/42 qbmuch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to j,. 9do4nwhn52cqncj /dbc r7that 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 cn fzsbl+f bxx6n v*v w ,7jiq,0k6)ob0ar K. The kinetic energy of car+nsfz, vl*wb x0vx7ib k 06bqo6)f,nj 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 original speed. Whay,: 4dpop +a2.gr7aa uc uoh( tahpj44t is the ra, a2a g:utdahuppc a7oyr4+. o h(pj44tio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speegl8 +rt,gi 5gkn;3o ted of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetik53t g+tgo;r,gn el8ic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving wzfwc/ s:c +o8vith speed 4.0 m/s. Both objects encounter the same constant braking forwf+/cc: osz8v ce, 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 brakes of your carg: wlskh,s+-t:vd+a gr1o;iof t,4kd in a panic, and skid a certain distance on a straight, level road. If you had been traveli,tf4d oksis- lt+h:;r+ w av, ggdk:1ong 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 orbitx8yy,q gctq1j)2)e0b;kbbr ts the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet') t 8e 2y j,bqqtkgxrc0)y1;bbs 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 princ gmf9 fno+3jtc;plmu4n5u .d4iple.

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 neul9o.nmbv ) piai as n/.mg60,g(yot ,gative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objec w+jj5w96vqs zjer)q3 t with four times the mass of the first if released from the same height. The potential jwve9wjr5z3)j 6qsq+ 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 w.40yil bo2*rpz q4+h n8 uhtsof a spring causes it to stretch 5.0 cm. If another 0.20htpros4by lh iw208 u+z*n. 4q0-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 energy of ae )b-dvhou.ek8s+4d:/rqju(o h zqrf8rkj 4( 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. Com -u:x:v*cgwh tpare its kinetic energy K, to its potential energy U.c*xwuv-h t:g:

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 7 nx tetjgt 1d)3c9 h(vml9iz.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 and a very heavy object are sliding with equald94en xh lsb,;df7oz7 speeds along a level frictionless surface. They both slide up the hef7 dlnx 9oz;,7db 4ssame 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 )3sy*bu0y o4b0xoo ag$m_{1}$ 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 /mf14q acu juvu6(qo/b,d7 ptof conservation of mechanical energy for conservative forces.1ujmv(6,7pu budf/oc/q q 4at

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is preseo5e(y 0 :f 1;zuldab+psgf lc89 skz7bnt), to thefy5bdoaz1:(lfc;u b e7kz+sg8p0 s9l 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?

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 o8sk 8n e0aga 1yoc23vs-o7wkjg+w 6air resistance. How much gravitational y3 01jwvg8c wakg8+ooskls6- ea2no7potential 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 oshu +4 zn-yy/xf gravitational potential energy. Do not ignore air rx yyhns-/ uz+4esistance. 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 conservation of energy. kptvn+ua,s jy-,p9k9

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 ishd( fa.gc/d u;

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 pow39: cilcf+anjt n o1i0er expressed in SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit og7 yh*naik+(x8 c9h;y8 dib*srjn 6x bdl+2yz f 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-third nhj3unjvcr6dn- +zq09l/ 8 lhthe time. To do so, your powednn 03u llh9z-hnr /j68c vq+jr output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's p z5yv p2+r19u*m hqhvgh:*pgengine 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. ;2t ot-/vz cxy4( oxtsIf the object weighs 90 N, how much work was done (oxy4vszt/ ;cx-o2t tin 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 physicsgsrm/ :kr- (i kvbxdv 039y5jw book up in the air a distance of 1.0 m, at a constant velocity ofrvw/ 9-d bv:yxi sj 0(krkgm53 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward ,;te +-bnct rbyz:d )sq2se arb2/hw9with a constant force of 5500 N for a distance of 50.0 m. What is tst2ar tw: 9hn+bczb2/dqre, eb-s y;)he 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 74ibqa /edk1av*pzf (c x5ec/ N for a distance of 50.0vd/kc ex*a7( 15/b icazepf4 q 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 fotn cg 7:2ng9lg;lr7yg rce of 5500 N for a distance of 50.0 m. What is the net work done on the elevator;gcl r7ygggn l2n97: t?

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 ax0. 2mfa)zxi* 3-v2jxeo lrlrr;jy9along 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 downe08 kja k,ya(g 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 littlecd v58 d.f;uohf/ga *h sister Sarah in a sled on an icy surface (assume no friction), with a fo 8gd;of hvuch.*d/f5arce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-1k 6m l4cpegtg)8oo:e 8yi9 m+r shows the force versus the ob 6)+lo8ptr4 mo ek9g g8eymci:ject's position. 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 inw.awblafn,7 1 the direction of the force. The graph in Fig. 6-1 shows the force versus the ob,b7a a.wnw lf1ject's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fo*0heq6mn /mcaj zf8;, m an8yzrce. The graph in Fig. 6-1 shows the force versus the object's posit*n/ ,m0yemza8n68jhq a ;zfcmion. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force h)*djhnkbbv8+ , v9qvhj;pw;. 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 9hhvb bh j)*pv+ wqjnd, 8vk;;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 aw/v/ r2 wk3. frzrt-mmt9i /li 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinet wr/lmf / 3r9mv-.ik/zrt2witic 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 55:0qkf ff;rj l8-kg cart (initially at rest) across a 10 m level surface. What is r;:jl80kffq f 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 requa. wfk,ksq:2 tlc*+i;u/wgi+jtk6 ar ired to stop the ma+,wsikk :f c62;ajlt.uatwk i/ +qg*rss?

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 distanc4nr /bqrp-2df bq2)ws e is required to stop a car moving at 50 m/s under the sams-r2wp4/b )ndqq2brfe condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocki0k9 5p blfqw//t dkm1ed by exerting a force of 20 N ov/lqd kt95 wbi0/m k1pfer a distance 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 horizontal comp6.4my aao:luz m.ap3 ronent of 80 N and a vertical component of 60 N. The force is applied to a boopua4mlr3 z am 6.a:y.x which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, striking the ha7.c nsuggsa a7c8, prg5+ spvg.yjr 1*y with a velocity of 60 m/s. It penetrates a ggp7vrcss. +gaspu.ag y5cnr7 8*, 1jdepth 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 flc0 -mbusq m72oyos hlbe9o1, ,oor to a height of 13.0 ye0,bc1sh9o m7-,soqobum 2lm 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 plan r qx, d);cnll+p11kjte is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much +; d 1cj1,lxrnlpk )tqwork 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 sk:d nr-9g v/qmpring, causes the spring to stretch 2.0 cm. What is the springnmqr:k- 9g dv/ 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 spring constant of 60 N/m1n7 crl2/ vbwzebf8: g. How much potential energy does it store,cb:7f /g8 b2vzln e1wr 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 compre;l ()sf3 d 5cblw,oujw1)vtcess an initially uncompressed spring with a spring constant of 2e,t wdco15vul)f bj;)3 wl cs(5 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 2iid8h ,w*ldkt crz ;+spring constant 40 N/m from x = 0.20 m hid t8rlw2*k,zi d;c+to 0.25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. ,gp gfssy),tr85q cs6 How much work is required to compress the spring an additi6gs c8) qfy,t, 5sgpsronal 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 slope. What is th3 )fcu(d wgy*.;glh;l jgayw. e speed of the slier on reaching the bottom of the slope? (Neglect frictiod(l ajf g*;g3wy )w yl.hgc;.un.)

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 initiaijytzt.sza3,04 hvi9 l speed of 4.0 m/s. Neglect.,ztt0yvhz4j 3saii9 ing 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 bolrh nr4cd1)o1ttom, it has a speed of 9.80 dorl4c)1rn h1 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.*2y cazea;-b s When it is 0.70 m above the floor, its potential energy exactly equals it az ;2ycsbae-*s 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, weighi l:fr8vf437 r,d5zit gmq7 giqng 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical r:z ,8f7fdgtv3il5r47qgi mqenergy 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 fs1lf-90rm+ 4zd naz:al d wm(m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relat9sa1zdmz4-(f:n+wmrl l adf0ive 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 vpo7;0+yte3 99pnaoivp 6icwa 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, which is 30 m above the botvac0i6ey9;+w pvt9 ionpo7p3tom 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 speedqvpru +2b: nj; wgf2g2:fa3 :gp v:oqz of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). zo2gjnqwg2v;af :b :ugpfrv+q: 32p: Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dic-o2iy0o u,z0ex t0v rp with a speed of 25 mri0 ocu-oy0v,20e zxt/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of 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 aqzc+su a8 )wddom bq))sv/-5h t 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 cm away fxoo)1* ,z,cryd) dtfykj, t4srom the vertical axis and released from rest. What will be its speed at the bott tkdd4yx), c ,fyst,jz1o r*)oom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncom* h0g h:kxzvl0;rgcw4 pressed horizontal spring with spring * gl0c wh4vzg;kxrh:0 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 2000 kg car to stop fopgp 7c/j7 f4z*l :zbgmk*:hvlqq 26mar a red light. What work is donq6bzc/:l*mmq2*lz kg4 pag7vf p h :j7e 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 betm*kj o2)y f*x7r1q vhvween a 60.0-kg object and a horizontal surface is 50.0 N. If theo* 2hvvfqj )x*k7y rm1 initial speed of the object is 25.0 m/s, what 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 su8gccs q2lw 7q1 o8t/bf6svxa )rface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How fol c st1w8a7/fgc qx2)68sbvqar 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 o5;kc5kufvsh2( m4y.c) kgbsfvc: l6 pn a level surface. The coefficient of kinetic friction between theck:f s ; c6 gvf k4mh.vy5pcu)bk2(sl5 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 qqjy931i7oh7b e* yiislope. If the work done by frict7 yqieh9o1y3ibj i7* qion 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* ybo2mti 6i /t9j(fa6nih2 fk inclined 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 magnitudef6hybaj m/ oi2i t(*6i2 f9ktn 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 aj 7-a6jo4 srdy plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What wil4ja76drsj y-o l be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10n t,5peqzs eyy;4n4 0gox;,wq.0 m, and strikes the ground with a velocity of 7.00 m/s. What a ;eso54yypewxqtzqnn0,4 ;,gverage 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 boy6,vdgqga f /m6 using energy when he runs up a flight of stairs 10.0-/g6mda,gfv6q 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 move an object with a constant velocity of d3cd*4 6dqqjdgt- 0pd3ion:b 5.0 m/s. What pow*pq cq-idd d nogd0 3j:436tdber must 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 hna7 2pn v/uho cluh/0 ,pt33ur dp8r(vp motor that runs for 1.0 hr? (1 hp = 7472nhdu(/3 p 3,ov chr8 / pa0tvrunlup6 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 mue w3 k2.7nz/hlt jbuf2ch force does her foot push with when she is traveling at 8.0tnz /jluwb7.3 he2 f2k 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 is the average xj8 i-75 t+zmaltuv )jpower deaxj 8tvi7j)m+ tul-5zlivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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