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

1#

What is the correct unit o.1o *lsh2s iqof 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 f)-uotx9lmay/v d9.f system if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amo9amyto- 8f6 ;j3m ;c,qicut wiunt of work yocwu;cqi;8m-3joitf m y , ta69u 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 being held there. )7 z6hmtj dbi1 How much work is b) jmt6 7izdh1being 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 horizonx)y e5b7s2f+; jn i4hyr0 vw6f,kmbhetally forward at a constant velocity carrying a 10-N object, th2 jhhv+b5rwmy4e)b 0fek; n,6fxyis7 e 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 3.0 m then returned to its orig: j,(v4eha9izhthe n3inal position. If the total weight is 3(hteaihjv : ne3,h4z90 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on the object?0isma)6*u hw g

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 str9rx-too8uqt0 aight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes dowto x r-o89t0uqn.

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 Fvshv5gs, 0 q 15g5dxhde 87hhqorce versus position (F vs. x) graph, represents 5xvh5,qg hqhv1sddeg75h80s

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+ .+ fvg-u vgjnjzb7)m qxxl,2presents the work done by the m+zuvj2)g+gljx-bfnv. q x,7force 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 th uibfs(8-8,w+ot nw oze 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 objopmv9l;frm13 ak1gwnk q:h3g24 d j)oect 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 an object is zero, then theg3 9nohh2r 5fo 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 a/4s2+s2 gnum.yopun xs a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to thatyu n+2sxm p./ngous 24 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 h+22 7yr x9 0y1ryb .uwjcnrqbjas half the mass of car K. The kinetic energy of car J, compared ty0wxb r7jyqbj r 2y9un.+ r12co 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 wallfoknl ioniz/b+ foc3ms6 g-gh(3s 2-5 and bounces back with half of its original speed. What is the ratio of the fina -hizf6go3 gmf5+ok (/s2s -b3icnl nol 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 6: ohvv*a(tvf:b+j v jand a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass6v: vhfvbj voa:t j(+*?

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 213pkq7z4;cm awqc /ga.fv mf 4.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking forc; kfw f/m7a3mv1.a c4qzg pq4ce, 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 car in a panic, and skid a c82g6*0. csf wl.g npqp gfzcqux3-,m wertain distance on a straight, level road. c wwfu.xz,f- qp8lqm3*cg0gg n p62. sIf 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 orbq*u )1op,p,mzqpxu; pits the Sun in an elliptical orbit. Neglecting any friction effects, what happen)p zqmxp,op1, pqu* u;s to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy princip /hxntn:q.*i fb9/frkle.

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 potentialko nw62k n1i)tmt3pk;mv0*v8et 0 lva 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 seh 8exrax7ab+,/0iwg ef; d6) w,corafcond object with four times the mass oxbffeca)r/,w07a owr,g +iha6x; 8d e f 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 stretch 5.0 cm. 38fhr h3mab01s haoj (If another 0.200-kg mass is added to the spring, the potentiahf ao31b3r(08s hjmhal energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a system(n xr9rdyzgj8 h.4x; k

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. 1 59 d0+bnnw p2io.x7rfyixalu4oho . Compare its kinetic energy K, to its potential energy U.afd+ru 2i5.9n4ly0x1o7.onwb i x o ph

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 drivil(-mn6oh pj t4ng 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 vevyi qy+)1mc g:ry heavy object are sliding with equal speeds along a level frictionless surfaigq:c +ymv1y )ce. They both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses x37fx evb+q1:k3kwua$m_{1}$ 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 conservae,,s* che8ry jtion of mechanical energy for conservative forces.8 rhs*e, ,cyej

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 build*/ix5 i t6xnfr1fg.w bing, through the air (air friction is present), to the ground below. t*g.i6irxf/ b wf1n 5x 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 disf/; m 7fz9ts:ywbaut2 tance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitfs tu:97yzt; 2/mabfwational 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 potentij)k6tw* wth2kn3u 8 dqal energy. Do not ignore air resistance. How 8qj)wwuk 6kth t23d*n 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.+ikvvr e8,s:,ntdl lgqe j:u1)s 6g(p

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 is3icqy8i.*7oimn ttw n 9ujgun lyf 21x. 2ye9:

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 inx:. 9g,bedv bu 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 of powb )sp82vu 3l8b3 hv :my/qevimer?

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 ojc7q+h) d,5peqcg rd +ne-third the time. To do so, your power o+e5hq 7qc)rd c, pgj+dutput 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 accel9v2m of(-xhw zeration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weigpkf5i atdpn:; c/,/ behs 90 N, how much work/bkde ;f ,tipp/:an c5 was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physi11n gke6)edtobjdl h;zu5u,, cs book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. Whal heueo) ;t1k ,1bgn,d5d6u zjt 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 wdnnt1)j.8xsnvn 6 z0b3)ybw stant force of 5500 N for a distance of 50.0 m. What is the wodxbzt0.b v n1wnjs)n6n8y w3)rk 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 upw)x:neuu )/o mdard with a constant force of 5500 N for a distance of 50.0 m. What is theuxmou )e )d/:n 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 force of 5500 N forb,ujdu3fpos n a (u8:9 a distance of 50.0 m. What upf(8on:9uuj3 b d,s ais the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m vz b ) nexs(;qie-2/rdup along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined at t.gn 4 y)hn llm2ovlk 6ocib 0*rmf*85$30^{\circ}$ 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 (asc9-gvs v6 gl5zsume no friction), wgclgv z9 s-v65ith 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 offwhmj;7ynuoe6qg f4b)28 (c8 m vpd5h the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the ob6md)pgeu 8hcvhfwfq7b8my 2 j( 4no; 5ject moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. 7y2k3 zb 4qpusThe graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the b7y2pkuq 4z 3sobject 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 forceg6mp6 lm* )ilq. The graph in Fig. 6-1 shows the force versus the object's position. Fi)*qllimmgp 66 nd 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 jc o;i 0ymz4f4in the direction of the force. The graph in Fig. 6-1 shows zmfi04c;jo4 ythe force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55e/6ose)9u .hsuuy 9/x pkml(c-kg cart (initially at rest) across a 10 m level surface. What is the final kineti/( 9yl.hu)sm k9 epeou/csx6uc 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 appl2 q.6+p*eavdmy;jndgied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is t e6*;y+2dpvmdq.gj a nhe 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 *2 : 0kdjku*wdcf*)nkov0gxm mc4+y lmuch work is required to stop thyc0 *g*vc*m4kn2m:d0 x+ udk f)lwjoke 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 cael8 c,/tfihh; c+e *etzre- lev,;l5cr initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the 8 erel 5ee,zt l;;flcc/-h*,i c+veht 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. Itmy-n yxf/gb w g1i/cu4(y 7)lq 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 ne/n-gwby q)4f7/l (yu1ycg mixgligible 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 vertical :+12 kxzb )w)fbb)ge rbfpvf0component of 60 N. The force is applied to a box which rests on a level frictionless floor. Th2wpk) gvzb ffx e)r0)fb:b b1+e 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 ha zpc4b(a-9isgbrc 5 h7y* t4yh,gq r-ay with a velocity of 60 m/s.a4rsb9ycrphq,c-izg 5h4tb(*7y g a- It penetrates a depth 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 floor to a height ohqln-fbwo/ ,3f 13.0 m above the floor. What is the change in gravitational potential enfw,-lho b q3/nergy?

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 wo /0 n*aw) bjz5sol ci,d4jj5up an inclined plane. The plane is 4.0 m long and rises 2j)lj5ww5 d0os/*, ijc anoz 4b.0 m. If the plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes thtwnnc*w;/*r0uv1; 9 gzf lw fie spring to stretch 2.0 cm. What is the springuwl*/wn; 0v*f; n1fic r 9gtzw 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 constu ocqscbdnq1o837 k pr03:f.. g t3yazant of 60 N/m. How much potential energot3u:fbsap03d. gnr 78zcqo y .c3qk1y does it store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress g0i 9/uz pca/nan initially uncompressed spring with a spring constant of 2u/p09ang i/ cz5 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/r83jpw/b ( wwdm from x = 0.20 m to 0.25 m? (Assume the unw b r8wd(p3w/jstretched 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 constan/ opa- ea, 6/ tn2fvs (fyq33ofe-fstzt of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additzyvfs/e2o/- (fe fa6q,f - os3 ntpat3ional 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 thew-6.d f(1eam z 7mxhcv top of a 50-m high slope. What is the speed of t1ec mzdah6f7( -v mxw.he slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pzv0 d .cm2ehgg;:i-m xushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be movimm h.id gcv2:xe g-z;0ng 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 *uaab+bm 3 6npa frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane*p n+ 6aba3ubm?

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 iskgbehn ,m;fy 2u *g03-kmp: gv 0.70 m above the floor, its potential energy exactly equals its kine 0:ukfnbphvge,m *gg- ;2yk3mtic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from gro7ek3nmt*c9xd und level with a kinetic energy of 40 J. At the exact top of its trajectory, its 3dt7n*cke m x9total mechanical 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, is9/3nbztdcllk* * r the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetizd 3/illnk9r,c *b *stc energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 4hec6sy2 ng9jtm.bi ,5t 7skd-5 m above the bottom of a dip (See Fig. 6ietyn.2- dsbcs,6mg h j759tk-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 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 sper2k f5tb vh.,l ,ruy9ved of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglr uv9.,yrtb,l2hf kv5ect 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 ob5tfyguy 6,+rex w;dv.m(kq-x n3mo1 il- n-y f a dip with a speed of 25 m/s mq.xe5vru36yn i;+ly , t1yob-w dm nxf- (gk-(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 at the bottoc3i*h v/p(jr(lmhkp8- ee8 bvm 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 s4- .pjta3i,8kjzi bkpulled 30 cm away from the vertical axis and released fropjjk , tk84izs-ab3i. m rest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an ini*m+uc r(rx0 odtially uncompressed horizontal spring with sprm +ordr(*ux 0cing 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 vv*i xca+bxd 50k2d,jj g8 +vckg car to stop for a red light. What work is dac*dkbv+gx,xv v 5ic 8dj0+2j one 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 between3qk;5m;j 0xsj+ mkj fzv da2m*b6uq:c a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming toa *5j;+:2zqm6skkbcqdjm; mfjv xu03 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 surfa6t7mc/r -tqxe8 om49:mt ahwoce. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wi oc97- har:m6tqmt4 om/wt8xell 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 suoqo cjk7 us8j.om0m /zh-+b0xrface. The coefficient of ki0-. ox um/o8k c bz+0o7sqmhjjnetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from epkkdq-j2ps- - sthzehq;0**the top of a 50-m high slope. If the work dont-s-zkpk*p2s j *;qh -hde0qee by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushe+*sih -htr6gn d up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It re-rigt+6h hn *squires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane 8 449 fhs-/lfd-sal hhs,tvmuinclined 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 th9dl48 v4- sfu /ht,mhslsa -fhe 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 62uh - (9*r4zay 0q+kpoeyjol5gn yzjfrom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on i0z(g ykah yzy*prjuo9+ 6e25 o q4jnl-t 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 heuzc )0.vimm()t r-cd i runs up a flight of stairs 10.m-i0dr(tzi cu ))cv.m 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 an4 x.m-gi19 lcevwoi*5w pw jx3 object with a constant velocity of 5.0 m/s. What power must be delivered to the objecx13xlw5ii wg4v pe.o*j- 9wcmt 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?/; y6k x:t tp5bnb5saof/nm9j (1 hp fnbb5x/npjtat: my5 69/ ok;s= 746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W whiu2r x2 5yuwms( (y(wjb unqi:+pv vbi89/bej,le riding. How much force does her foot push with whxe(9: bvb 5b2w(sr+ 2y8q uyji wu/(pnmjv ,iuen 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 254 c5hnjt x33(geqrsw7 m/s in 7.0 s. What is the average power delivered by the engiqj7e3t53g shx c(rw4nne? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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