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

1#

What is the correct unit of w.:p*dken ()pl7zzrr v ork 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 system0:)v)spqk 5y5vmpqu 9 csr-d o7:pl ga 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 amm 53pd+ kie7mkount of work you d7m pem 5k3i+kdo

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 he v6 w18 (np8 xmw3qddzxas:u5cld there. How much work is being done in holding d8m8 d5cwu6vnsz(xxap3q :w 1the 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 for-k/( o:0 wvrzhwfxtgr*7dh- nd 3c mj8ward at a constant velocity carrying a 10-N object, the m(nh3xdtw j7:rcr-dkvgo/hz8 - w0*f 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 verticallnbb2jfc 615z;919 zayoqx c liy 3.0 m then returned to its original position. 2aq cxlo 6bj cz b15;fn9z91yi If the total weight is 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 acting on ly 87v6xnx.tc (y(us lan 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 -+1 qj40uxx/gayth kbby gravity while the ball goes up with the sign of the work done by gravity ygk /u4a-1bq t+ hx0xjwhile 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 curvee c4fp)tg4hr95zmf ) f, on a Force versus position (F vs. x) graph, representst)h4c5 mfg)fr4fe9p z

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 g5 hce q ozxx.8b/no),, vsvj*vs. x), what represents the work done by the forcexo5 o.b8eczv jv,*qhn,gs/ x) 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 a ,x; zq9 io sl)28,;5pgu h8amcuenu +6bzdyesn object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then thaxubd) 3f:k3xnbt zrg96- *c ie 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 objechs) d9*yk*wf4qrq 1vh t'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 twice the spez 1ssxsx. 7zq1w18 ished of the car.s1s1xw7szq8s1 i.hxz Which statement is true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and can :temg*la/ enl 9-/gcmj9ut *r J has half the mass of car K. The kinetic energy of car J, c amlje :g-c/tn*/nu99m*et l gompared 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 hal lf15ds3hje8eovsc x:j g9.o;f of its original speed. What is the ratio of the final kin:ed9o1slcf;hj3s5 o8j gx. evetic 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 pebble41k0sl xk/gou5wvz z3.4 do pi is moving at a speed of 5 m/s. If both objects have the same kinetic enxlzoopsgd4k35v i/0ku4.w 1zergy, 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 ma,hw1ho*kfm8kd r qw9 1ss is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object trave 1d8w1hk9w,rqo hmk*fls 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 v cg*fq6(:risoqtjc g p+8g.0in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would vf 0.rg*jtqis: p(6cg+ gc8qothe car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit. Neglecti w)zyzr oo+p4;6rhk:zng any friction effects, what happens to thez6 khy+4wz)rroz: po; 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-energzldq7s8o:8 mr* x4 ak.itqhl1y principle.

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 t.2smx .af-jr to have negative 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. odo gx.bth7ys(*:k3a A second object withdkt.g * saoxob7 (yh:3 four times 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 causes it to stretch 5.0 cmh r0tk d3bnkqo*p4*:t. If another 0.200-kg mass is added to the spring, the potential energy of the spring will t:q3phdk0* r4*knot b 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 sjk i7qch h7qp1c (he,2ystem

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. wsx03,p0 csz.fo/b5m ,n eysp Compare its kinetic energy K, to its potential energx cpm,/z.s0ebw nys , f0p3o5sy 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 drivhw 6cki( vcfk35q 8.hxing 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 equal speeds y gs*7e10nln:dc)5+mjo mlw oalong a level frictionless surface. They bot1g0m+7o5l n)yn*om: wsedjclh 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 , 6dqz:icj)tm $m_{1}$ 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 conservative b9 4d+zkd)a hkg:o5rt forces:54 9k+)tobgdark zhd.

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 n 3l61ut k*tybfriction is present), to the ground below. How does thn1btl63yut*k e 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 distanc km+i)n 7 i,vgmb,n +r7w qhvs58smy0ce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball ln,7hmi+rvbm ,)y0 8 i5 ss wckgq+nvm7ose?

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 potentip f2toi*m a9(val energy. Do not igv2i*p9fota ( mnore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of ene7 ygc0,/leqgqrgy.

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 isdfcu+ b.+h bbwh*g5m eke gv1,6b(*tu

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 unitm bux u0e,0/v6-7 e/kl wehvkfs?

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 notzmf swj/ ,hmodbmy1s1y8 0 3i1 a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the4bsl v c7sr 48b 2w1a0tjnsbc: time. To do so, youalvwb4t8bscjns: 1br c72 s04 r power 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 csncg.(z u+ 6 w5*ghzefar'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 tjmt ,q;/w o3o91mdhw bhere. If the object weighs 90 N, how much work was done in lifting i3;bo/9joq,1 mwwhdm tt?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant vcd 8lnjb5;6wztxgy ;7i:b8 jkelocity of 0.50 m/s. Whal6 ;8:7j5c bw nbx8yjkdzgi;tt 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 constant force of 5500 N for a i9r/5j)d ,tzap+w ck7h5zniudistance of 50.0 m. What is the work done by the a5iri+ kd7n/thp cj9uzz5w), 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 fo.b: -seu3kef3sy dz /g-fz mqt6pb4z: rce of 5500 N for a distance of 50.0 m.e-m d gkzebsqp:uz/ 3st6yz ff4b 3-:. 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 forcn6daz1m zwu y;97(gk ypglp+.e of 5500 N for a distance of 50.0 m. What is the net6dy1pl mwzgg;kynz7 .u p(9a+ 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 up eomt. 5; 4 2u dncir3l8c.j0 grtss6b3wxn5hdalong 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, inclinediw;5xc yxu( :m 2c :0sdtd*oht2dp8xj 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- zyh9oct+1p:/yuge z Sarah in a sled on an icy surface (assume no friction), 9u gp:htz zy+-y1ce/owith 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 of the force. The gray( j-dkqt (0hm/:uckuph in Fig. 6-1 shows the force versus the object's position. Find the work t (hk(0jm-:uk cyd/uq 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 in the direction of the force. The gyl6h1*b)n/rk 9nr hz/7zl gok raph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves rh 1kh6nblg7)orn* 9 z/y lz/kfrom 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 for 2:f7 jofpdsd;ce. The graph in Fig. 6-1 shows the force versus the object's position. Find the wo d f:2foj7p;dsrk 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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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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 :egrw73 tql9c in 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 from 0 to 6.0wegtrc 9: 7lq3 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially o wl)7z8hq6k1 nwe104jtccz6 vzdn y 9at rest) across a 10 m level surface. Wzonwec0)6 1 d18 zykn4j qtv7wc6hz9lhat 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-ky aye- sy4an z1ayn0m .ip/z8,g cart (initially at rest) ac y/y04aazyaz8n- es.n,piym1 ross a 10 m level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a s+psyi(q;t 6rk peed of 5.0 m/s. How much work is required to stops+ki( q;6prty the 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 d+nrbv:b qrc1ar sl 9.jw h3tzvji-.)(nh bj84istance is required to stop a car moving at 50 m/s under the same condit9(j4l8-rwj:js3b bv cvar1.) th .i+brznhnq ion?

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 prop )iq,ih5( dj ff,l3x6lg6qo8y yuf4bp els a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?58,g)3o(pf by, ffdljulqq y i6xi64h

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 horizon q4a jmrflz54l2,gihm1jr 38sdb sn :+tal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a levn al m5l1bhj 84d4: ms q3ri2r+fzg,sjel 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 horizontbls7;cm4zr ly,tdv 9 f)z 02e-ocy4 ycally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Wyzyloccm - ; zfl)0edv4rs,74y92 btchat 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 flooj .9 .td7:tv.dn0qk pofzj-ksr to a height of 13.0 m above the floor. What is the -dt.k.:ds9q ot7 kf. vj np0zjchange 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 inclt nwj(r dff2:e 52d1viined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was d2dj: n f2rd(tveiwf15one 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 the spring to stretch 2f+c7dn3tln zm ry xq6:0i,6 zg.0 cm. What is the spring cog,0+xmqlt7n 63zzd fciyn6 r:nstant?

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.umb d2i1k v.w5 How much potential energy does it store, .dmbu1 v5 wi2kwhen 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 requi/n)j/ .1mjtluextv,g: cx z;u red to compress an initially uncompressed spring with a spring constant of 251v/ ulex,t mzuj gnc/:;.x)jt 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 5wf4c+brn7eqc m(/ )yl j+pjbng r11d stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position1g fbp my+r +w47er()1n/ lnjcqdjbc 5 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 initiall o)l 9uh kriwfojh lxn. oe41i-2,f8)/zz,hkxy compressed by 3.0 cm. How much work is required to comp2) nj9rxh/ i.fukoefowz4o 8 -zh l)l x,hi,k1ress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m hqxsgt 0kz 5q-3eo63wiigh slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect tz5s 63 ig 0koqxq-e3wfriction.)

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 im,foyq.6 c l4nnitial speed of 4.0 m/nyocfl,4 6q m.s. Neglecting 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 dow9;duk0 sv.cysr/w s. nn a frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane u0sdrw.y s scn9;.vk/?

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 abo4 8 gd, lueob(2l8yajgve the floor, its potential energy exactly equals its kinetic energy. How fastgb4j2(ogl 8y 8a,l deu 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 straigro:,her8t+cc ht up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical enerctr+ore8 h:c, gy 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 the9qohmn7 4 3rt6b,nm 0 rsyrky2 ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To ynrm3 rkns 47qo02t y h69b,rmwhat vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 mti ; +20blj.eryuxf1q above the bottom of a dip (See Fig. 6-2). Neglect friction, what will 210jlq u +;itxbfy.erbe 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 sp -:i3)* 1b zkazq dgqknjt+1pfeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastenf*p:1bt d a+-13)kjz qgkzqi r 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 a88e4 iepjjd9wp/azj :t a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Ne/ a4ij9jppj8zw: de 8eglect 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 th p )vjm3gu5yfct4;)hae g8jc, e 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 pendulum of length 50 cm is pulled 30 cm away from ot -mq8k3grnk4l8uz0 ye*ji- the vertical axis and released from rest. What will be its speed at the bottom*8gi k-zr4ey-q m0lu8 koj3 nt 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 +m2v 4*yguyzuvqu f s5-c0tv/ uncompressed horizontal spring with spring constant of - yuusy5+gq*t c2mvz vv4/u 0f$2.0 \times 10^6 \; N/m$. 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 fohh+,4h*z :ago;e4s,ffis k. tb teml:r a red light. What work is done by the frih4eh s:f: ,, *otzi+tlhmb 4f. sakg;ection 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 a horizontal surface iseg hdoms)/m/4.rbm:uotc8t ++tcw +c 50.0 N. If the initial speed+m: e 8.gtho4 tcdub)/rmw/o++cc mst 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, leve6lp/szkes 64g l surface. It has 24 J of kinetic enersg 4s6kp l6ez/gy. The 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 horizontalz)mx n2)s*d bcly to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the chb2nmzsdxc) ) *ange 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 s k*xt 9 )i3-7bphxdfkflope. If the work donexfdkt*xbk)79-f3 p i h 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 pushed up an inclined plane. The plane is 4.0 m long ani jf w-k,g7xw6h,pll(d rises 2.0 m. It requires 3200 J of work to get the boli,, 7 f6gkwpx(whl-j x 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 releasedqkp gprgxq0 w0y:: 0g. from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane. gqrg: kq:ywp0 0xpg0 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, and stf*y0e7*paut ) d5upx15faw8 wuz a:ynrikes the ground with a velocity of 7.00 m/s. Wh au*:pefy*zaaw5 dy7 f0nt uxp81w)5 uat average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boypde pzmckp)*ja z6960 using energy when he runs up a flight of stairs 10.0-m high, i*djap 9z cpek0pz6 m6)n
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 5.0 m/s. 1: jigu s)3dwhWhawhd)u :1 g3sjit power 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 hp motor thmh u fu+j+3;riat runs for 1.0 hr? (1 hp = 74+ ihj m3f;+uru6 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 whntc 538gps ;ka t1y;ylile riding. How much force does her foot push with when she is trs nlay8cy t3;g1tpk; 5aveling 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 f-uucatc984 m(b1da )9ayq jkaverage power dt)8u 1ca-uf 9j d ayb49(cmqkaelivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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