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

1#

What is the correct u-j6e6 tdnmd*0bc8zp b 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 a system if th3/di( wply +s3pf-a;bt*opj g ere 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 work p9o2imlcsl q s8 vs 5h:u(i(96m-qwyf youmsmi (h:(29 qp89lfys lqoui 5-vscw6 do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is bei ddox s4xxuz (+/kcj5 q6+ate1ng held there. How much work is being done i1d k c t zxdx5u+o/qs+4ex6ja(n 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 horizontallpdnzio ;*j bm)/dz8x,j-m pa7y forward at a constant velocity carrying a 10-N objejaidzpmo x*,b8 )/n jmz-;7pd ct, 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 verticallyyto0 /j0g ssu gj)8, mu,lf qf:)s)rwy 3.0 m then returned to its original position. If the total weight is 30 N, how much work ,wfotrm))gsqj)0 8su yl 0:/ jsgf, uywas 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 d xv+qwk4q 9ns0 grb/0u4 7aevan 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 worf4:ln8d/0r m5uv va gy3rxv5oc 0 je-ek done by gravity while the ball goes up with thecr0 en g5/oe0dmy5jfl v vx-4ar:v8 u3 sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a For2w2*sptq.mv;z x4rgdh ,qct3 ce versus position (F vs. x) graph, representsqc2txq3 zg *wd thm;,r 42.pvs

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 represents the i(z8l p) ml1vbwork done by them bp1i (z)8lvl 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, th :r 97ep6vwmyden 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 ob+br rk(z o8* b:ofipgf4a k;/vject is negative, 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 avz net2hy7/4 wo6tz 5cn object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twijmlfki2ld1,+oa e 0( ece the speed of the car. Which statement is true abou,e loa 2k(1e f+idjml0t 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 c5p,6 srnj..mj6 gawp*u da(t lar J has half the mass of car K. The kinetic enemrp6d al *t,wgus6np. 5j a.j(rgy of car 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 origi 6cth ;dhoj.3xnal speed. What is the ro3c hxjh.;t d6atio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is movinyxs+v s,pr06v g at a speed of 5 m/s. If both object,60yr sx+pv svs have the same kinetic 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 sphf1uz 3a nixc/)5b(nj eed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest.b huc3)a1 5x jfni/(nz 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 brakeayv fbt4*/)m p/3j-/ wsidypp s of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under tha-mpsw4* ytfd) ip v/b 3/p/yje 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 constantxdmq /s(3vj l7 mass orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energ3/l7 ( jvsdmxqy?

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 gi1*;cz; d *w-czeuw1 e ,cggqprinciple.

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 en1x*ar :ycu ;7ysphrj;b h1(x* gbt8xbergy?

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 k/v-gr6 ms om162y wteobject with four tiwmogv 61/-s r6emtk y2mes the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring cau(,+ywf7 ;whji8 qwv fnses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energ7+vifhwjy f q,;w(n 8wy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a sysjcr3f, 5lab b4tem

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. kxit8xz*a4 9 hCompare its kinetic energy K, to its potential energykxih49 8z*x ta 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 drkc mg7m;j6htqt g4:xf k7y27riving 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 slidiuz36 +mjh avr0e-a,6/io 0gsd d xfjq;ng with equal speeds along a level frictionless surface. They both slide up the same frictionless hillv3;sa qh00g i6jdjumzoe-+r 6af,/dx . 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 jnev,938v k77h*qps zmj,u zal; 1rmt $m_{1}$ 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 con yxzg5+ ij8am.servative forces.gi5ax mj+ yz.8

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 thlr6 xi-i8wl q.lj.j, 9zt h8xue top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the rixl.t xqhjw9l8 j -u6iz8,l.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 discokqki ;ksx de2zg7s * n(spw7w. z ;ewp6b,3,tance and gains 30 J of kinetic energy. Do not ignore air resistance. How muchdcwzwg7swko .xe ;knps723si,k z p ,b;q(*6e gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potential energ5e,fn w)ne ykm-:2wpf y. Do not ignore air resistance. nm:)enp,yk5 e wfw-2f 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 y5y2i 8z(lniemao73+o l s u;dof 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 isqgsn r0,7 k/ov

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI uniyoj9g 8sefkn j7u1y51ts?

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 n 4ygbkz7oq3n0s 6 n bssq;:z6got 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, you53wt+3acgwk p did 3 times the work in one-third the time. To do so, your power output must have b k5c+a w33gtpween

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 e6n t+m wj3 gfcb7ti,6angine 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 m6y54ivmh 1jsa and held there. If the object weighs 90 N, how much work was do46i1my5sv h jane 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 physic dv q:e cz509rvvhazga8sw/c)5v1 bw7s book up in the air a distance of 1.0 m, at a constant velocitsqbacv 5vw )vwrdzv ce0g8z/1 7:ha5 9y of 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 with a con:xi2 ks koz8z+stant force of 5500 N for a distance of 50.0 m. What is the work done bykz8sx+o :i2kz 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 f n0+edh0 lfa6bor a distance of 50.0hln 0e0dba6+ f 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 constbd)ixu2z1 c6r regae:4i 9yt;ant force of 5500 N for a distance of 50.0 m. What is the net work:gii2 ;xeab9 tz1) 4dryurec 6 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 along akpn- *+s bn3cx $37^{\circ}$ 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, inclinz+pn hh;n1 7h odjweha 2)9zi,ed at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fri1b;h37le nplxx 17xyoction; 7opx17hye1lx3lnb x ), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction onc19mt:*g(zt q5bor gf the force. The graph in Fig. 6-1 shows the force versus the object's tnc(zt 5mgqg: orb91*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 obj8r 6lvy cm7ifbhv3 38dect in the direction of the force. The graph in Fig. 6-1 shows the force versus thb83r3ch ldm y876fiv ve object'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 force. Tb5eldkpr / ;a4bfjmu2q7z1 cl*:d-xi he graph in Fig. 6-1 shows the force versu ru aciblm54;:l*2dp7q1e-zb x kjf/ds 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 inbfh- z*r. tc9igl8uo8 the 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 fr98ztio b-cr.f*ghl u8om 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 movec *yvzn)k2j a- a 55-kg cart (initially at rest) across a 10 m level surfacnj-a zvy2 )kc*e. 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 (initialls/jqug*k9vejn tt vrlg+:*-m,o( ox-y at rest) across a 10 m level surface. What is the final speed of the cart?urk* xqnjv jsl -v:*/, + o9-e(ttgmgo

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 requiwcxj.9 *qpm,lm5 n zfayha 15/m6td w)red to stop 1p fhn*w5 mtacm5 )wqd/ajm.yz6l, 9xthe mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is rn ypn9iq dqohqe480. :av/xc/k:)w4jj ydn 8b equired to stop a car moving at 50 mc .qh) qdi oj94/xknd4nv ynaj/0q:b: pey88w/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cock)v aj*ok6 x2hied by exerting a force of 20 N over a distance of 5.0 cm. With w)ix 26ahkv o*jhat 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 component of 80 N and pym( srz rh;x 2m.0gl-a vertical component of 60 N. 2s mrlh( mgx;pr0-.zyThe force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is 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, vl 8t/ fioe,6s3n v1sq/hoj,s striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting 1 hs3 ovt,jo/6 sl8f,vensqi/ 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 l3b;gs(ie t/o) uzs2mdxemtxp.:i6+a height of 7.00 m above a floor to a height of 13.0 m above the flootbpie g2x: ss.(;6+mei om)zt3 ud/xlr. 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 m2m sitre/0ec;9(q6 tz8c nuk v long and rises 2.0 m. If the plane is frictionless, how much work was done by the pusm tu ntc(2k0q/ce v;6ri9zs8e h?

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, causyji90+ m,pwqk5dq jq 3h6r i/tdae g*;es the spring to stretch 2.0 cm. What is the spp6it y,/h3jj0q*q+r5m d9;eqgd akiw ring 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/m. Hs .g0) aprti+ 6ztfa)sow much potential energy does it stors.zt)6r ptsa0f+ iga)e, when stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed springndpft*yum5*,r. y;lceg3j 8k0 2zi cxpe4l5 p with a spring constant of 25 N/m by m.,0kg;pyjdrl i* 8*5t52uxlp4cp czf eyn e310 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 sprgj5e*0nn ex:xxri.t; ing constant 40 N/m from x = 0.20x:5tx;ne e r0i.x*jng m 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.e/fnbu6yv; d .de8q:i t xc:,f How much work is required to compress the spring an additionfxceyidu: v bt ,n: fq8d./e6;al 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 3qfbt3qpq d)++-r zr ik0w*atqr 07qw the spepw+twbqkz 3tq rqa7)-d 00+ rfrqiq *3ed of the skier on reaching 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 the top of a hill with an initial speed of n498bmxhntljab i ,)44.0 m/s. Neglecting friction, how fast will she be movxj)9 b n84,ibah4 tmlning 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 bott zl7qb gad3t0okg)43o2vk0 m x7 dlc ef3m6dq,om, it has a speed of 9.80 m/xlq)vl dodqk2 7b m a34e3d,73fg0ck6t0gomzs. 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, n6cpg,x5l1 gj its potential energy exactly equals its kinetic en5jc nxg6 pl1g,ergy. 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 ground level with roxj j0vpf)f 0yrm/,4wl o.57kv))vn erzd u 9a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height do54m rnue/w) 90 .j)vj7pf)dk0z,o lxyvofr vres 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 eu4/e pq -biar3nergy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pr p34-ieau /bqoint, 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 tj eq8gghi(p;5:ly2eib9n wz a18*ap o he bottom of a dip (See Fig. 6-2). Neglect friction, what will be pi za5(n: i lq9g8eeoyhp 8b1;jwg 2*athe speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bote5y(r3pl23 t dv, qod./fmgvqtom of a dip (See Fig. 6-2). Neglect friction,/f ptmd5ryv,3ql ged v q(o2.3 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 dip+avl 2:3 ztl/rqe bjc6 with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster 6b/llv:etj q+ar 3z2cat the top of the next slope, which is 45 m above the bottom of the dip?

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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 de )iwsi 7k3s(n.nl2 kg., vcvspeed of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.26pg :g c-r1z qg4+dvp3mzml;8 q m away from the vertical axis and released from rest. What will be its spee mgg8lqz3m:+ pvgpd ;qz-14rcd at the bottom of its swing?

A. 0.3586 m/s

B. 0.956 m/s

C. 1.435 m/s

D. 1.196 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 ana (2+q3vc r/ .uljjpjr initially uncompressed horizontal spring with spring constant of.qjvr+ c /ja(2l r3jpu $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red l3nik)sqt e;6l ight. What wks63t;)le inq ork 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 between a 60.0-kg object and zctxy7( z sso0vazm 0f+,t+ s8a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide betozz8mac 7yzs+(, t0+0fvxss fore 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 ont pg/ 8/qs9r..rphr )g r9t,(k qfqubp a rough, level surface. It has 24 J of kinetic energy. Thq9b /pus, rq/.k8g(t.rfgrt) hrp p9 qe friction force on it is a constant 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 level surface. zgx c8c/*zo-1xhu tu(The coefficient of kinetic friction between the mass an(zuuz*o/hxx-1tc gc8 d 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 to/g nnkqr9 t;9cpnz2dk :2s5i sp of a 50-m high slope. If the work done :9qnd ss cn2p/r5k9k zin2g ;tby 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 p;xs 25jqs:t 7cy- evzwlane 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 pzxy75sec2j:- ;v sw qtlane. 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 from2ob 3vp z+w e19fqok6c rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction betv+pc192kez o bwfo63qween the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m ht*;cfiuo,; rs5i /1rjs d;pd, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts onhr 1;/rsitdf uc;i do*s5pj,; it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a fligh3,xysvmmkq k 6g (5g;towm0s +t of stairs 106ok;,v(0k x t5+ qms3wygmsmg.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 move an obgv zwwr6r63k egpp43.ject with a constant velocity of 5.0 m/s. What power must be delivered to p6.4rzr gpw3v3g e kw6the 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 t5fxg4c enki ,1hat runs for 1.0 hr? (1 hp = 746 Wf1k e4incg5 x,)

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 forza5o f* z.o5tzbbam;-+ dh0 p-+iztfuce does her foot z+m ia+o*zbh5uftt f;- . p0o zz-dab5push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power ,bi vw-win9z+xfs, +n, 9qb urdelivereq bn 9-fiwi+vx ,ruz9+b,nws,d by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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