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

1#

What is the correct unit of rd+ eje//h;gywork 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 system2e)7o ) kpp -qlmlaa (plj-zodlp //a6 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 asm yhwjc;l s2z.5a:3m n hard against a stationary brick wall, the amount of work you dolsmczh3 2 :amw.5; jny

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 thy m9 08lweiie*ere. How much work is being done in holding the box in le*89em0iy iw this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carryius;qwny79 r64y-hb7a :hff emng a 10-N object, the am7u nes aqf 67w-yh;b94:rfy mhount 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**r p/5 ,jyv t5vkcbsz is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much zvyp/5 rk5*jvcb,t*s 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 o 8cuqyq8(,0;*fqa 2m cqcjod cbject?

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 by gravitygc8; 4hxz40e/2v 63gzktivhk.q rmuy while the ball goes up withzg3g m k04z4q2 6vriu;c/tekxvy .h 8h the 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 Force versus position (F vs. x) gradgn 2-fx cy n6:u:ze4oph, representsg -xc2nu4 6fyn: e:odz

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 posc63+v jv.h)il twnt :oition (F vs. x), what represents the work done by the lw:vhc j)ttn3i+o6 . vforce 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 the o:touqf( 2 cm-dbject'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 npxtx/i8c v(d pi779c3 gna:ckegative, 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 ag82xz,. 4mzc/ eir jean 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 cahzuc3ihx o lx-(q3 rzxsd9v h)dn;94u:.e n3qr, and is moving at twice the speed of the car. Which statement is true about the truck's kineticd;dn 4x cz e(l 3q- nuh3.ov3:sxh9qr)hzu9ix energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has hk lo) :7bqetm-alf the mass of car K. The kinetic energy of c-k7:ble t )oqmar 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 ofnlu-np ilc x6hwbu09 gpnh8(05g*4a m its original speed. What is the ratio of the final kinehg nnlug5( cnip0x6b*9hw-lpam0 8u4tic 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 j3no* wtmb(l8b+;khg m/s and a pebble is moving at a speed of 5 m/s. j+ogt;*mln3 bkhb w(8If both objects 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 s oje8r;a3 ,usipeed 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. Which object travels the greater distance before stopping?uj 8a,;3i rsoe

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 oft4e t;ett;lng :/ b0cn7ns*gu your car in a panic, and skid a certain distance on a straight, level road. If you had bes4gu : 7e tn/;nln*t0 eg;btcten 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 maoejh0yxe216)uf rx c )l p)pzhwag)oq;9 2n n;ss orbits the Sun in an elliptical orbit. Neglecting any friction effects,) a)u eqzf) olnr0whp)nxe6y;;c2go 1j hpx29 what happens 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 prinummq .w h y,z-cjt5cc36jl 4u3ciple.

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 poten,e3w axakr45 ptial energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objectw,/ q gsof,yqi9z9z .p with four times the mass of the first if released from the same height. The potential energy of the second object cz9ws qi pfz9qy/, o.,gompared 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. I*l,bp0ol 3lqlrrh- 6f f another 0.200-kg mass is added to the spring, the potential e3qlorhfl 60lp*b lr-,nergy 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 , 3vc0crwv llpt(j)5u system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a fv12pzn os )vmkt.k1 pcn 71/wtree. Compare its kinetic energy K, to its potential enerp1pv/2w 1. cfo)k vnmzn1skt7 gy 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 carwf2.n* p ngt*d driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding 3hv+z4 obmqds bxc;1zhs( 93a with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises tc avxbs qb 4hm3d hz+91o(3zs;o 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 t4 9()xibotr w$m_{1}$ 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 conservativeiy2rxzr oejdb7 76,gzj(, c o) forcesz,oro jb, d g7)y2zr (c7ije6x.

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 e gat+bbv ko w539;etk pj*-g2the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the grobk9e2ttp; -+gav*bow e 3kj g5und compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do n-6g ( psa/ 4tt lun5ekywt+o,uot ignore air resistance. How much gravitational potential energ ynwlt( o kepg +t54as6t,-u/uy 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 an(lj09ywk8a db d loses 30 J of gravitational potential energy. Do not ignore ai al9j0y8kb w(dr 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 conservatiysuvp fi0-*:h on of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t isr en+hw6h qt9,

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 units?(* hwq iezfjr)m.4t4n

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 c.mmwoc m(*8 u. fvea(is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in o (rqa r/blmu*tbn- -d2ne-third the time. To do so, your power(--* l qabrdt2u rnm/b 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 a ,3iq, erp15stu tv:qmcceleration, 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.o6 2wxp5 (*kpofviq 6leu3 0ng If the object weighs 90 N, how much work was done in lifting ig 6 0l5iov*kup(qpxne6 3wo 2ft?

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 dxov-3j ;:1kv5c9.npyh uvz/ h x jt-olistance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the t9p5c kz3.ov :1-lo-hvhxjx;yju/ v nweight 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 constdma+2wfb/ i(hxtr:53 p 9ol;kqy/ w iuant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 Np wb/ hd9o2u;tx/qfml:kya 35ri+w ( i 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 coc kn2. zp(rq 7s*, icds+b az,-sd;skpnstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of ta,r, sds*(zc kpp+i;s k2q7.cs-d nbzhe 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 wnmo5wa8.g7tv ith a constant force of 5500 N for a distance of 50.0 m. What is the net work done on n.8 a 7vm5ogtwthe 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+gn.rr. z317hw:b fhn cu cgvh0m*i:f.0 m up 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 frui) zlys5(hdhbg7;-jtgggoq+ j:0 jv 6it slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an -gmf:pf)aym6 (ui bnfhf (g02icy surface (assume no friction), with a force of 6ybmf-p a(g6 fi:n2fmf0)g( uh0.0 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 j vfcwm4 3m2np1g,2olin the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posi 2lj2wvogfn3cm m ,p14tion. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of th ( t9d:wdyo-rde force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work-ddy 9(o t:drw 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 dir k,zp4g 2ai.axxq( fc7,ba8yp ection 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 4c,84 paxiagk z 7ya,b .qfpx(2.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the fo u.4 (ukvn.euhpv-db-rce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objecd-u n kvh.v eb-upu4.(t moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart *ylsu74 rohcrs3h 9-m(initially at rest) across a 10 m level surface. What is the -m*rrhhl73s s4c 9yuofinal 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 sy4.hbzqy2-yN is applied to move a 55-kg cart (initially at rest) across a 10 m lev-b.qh4z2 yyy sel 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 ac wm /p3hl+qk- speed of 5.0 m/s. How much work is required to stop3+hc lq-k/wmp 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;qitt4 ;gezw:j m9e 5u at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same co guw:tzji4 ;ee9q5t;mndition?

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 propelz cm)y,w6l9*uu /sbao s 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 ma a6muyw/c, 9u* )olsbzss?

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 ve84p sf*apgb(/ 2 eygfprtical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's fiyep8s*fa b 2 pfpg(4g/nal 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 int(qliy xi6 6i/so a bale of hay, 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 ly6 /s6ix (iqion 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 h +a vmm9:b+hrfqa o.w-eight of 13.0 m above the floor. Wm-wa+ q9 bmraof. h:+vhat 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 e. k.ar:g-0bz.l+uyij es ( fum long and rises 2.0 m. If the plane is frictionless, ho.e :.sgr.eu0-zfualy( bik+ jw 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:0l c:9gwmltw.e6ktbeaex3u 0p69 ps a spring, causes the spring to stretch 2.0 cm. What is the s scpm:0.e:9ltgetl3a x 0ew9pu66 k wbpring 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.mkp**g tl jm8rh s7o/pepr/7 60 N/m. How much potential energy does it store, when stretched by 1.0 cm? pjrh k8 t7*lomps*gep.//7r m

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 requiremi aa4 f8(8eobd to compress an initially uncompressed spring with a spring conim oab48(e f8astant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a i-uaurj .z+y 8y8p9hv spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretchevrhp y- u8zj .a+ui8y9d 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. Ho iv( 7(e cgkh+)xkta1u+2k-c vz+ rijsw much work is required to compress tii+1 (a)z+2kvk( ht+urvc 7js -eckxg he spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. Whao pk)5*hd+ sap+k0 yengiu. uw1t99mkt is the speed of the slier on reaching the bottom *91 ntupy umwk+ h o+ia )k95ekd0gps.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, pushes off the top of a hill with an initial speed ofz. 1-6g7cb ntm-lopfgl a2/8 yi: n. 9krpaaif 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 98 tma n- 2 ga.b poi6kypfgf7n:1iaclz-/l r.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.-qvb, pd+ku 7i At the bottom, it has a speed of 9.80 m/s. What ipq+ud v k-,i7bs 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 0.70c8 rgs :bxd5ilz rxk49pcl:9 3 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it movings 9 x9l:irgrclc: 8b3z4d5xpk?

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, weighinkv 83+qnaaknry2 *r3a g 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajector 8anrka3* nryk3aq 2+vy, its total 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 the ground with(:apsf n2j 4f fqp.k5r a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy if:krq2j5pf (4p n.fs as 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 45 m above j,fztpdkq4 r6- 4d;m w7ns4fathe bottom of a dip (See Fig. 64wqs am4-z74fn f r pd6d,kjt;-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 speed of 5.0 m/s at a point /z(n pqjw dy-+45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster dw-q+n yp/z(jat 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 po3c3g) 23eh iwva2wm6qx2.b ;yskgd xrint 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed a3bhew 2. ;ivw3x3d k2m)x6gcysq r2 gof 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 j0o1 v -xrs7rhkr.8zl 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 away0 orot c z:)lm1)lpag. from the vertical axis and released from rest. What will be its speed at th c0:)zpl .log1 ra)omte 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 initially uncompressed horizontal sprin n7 0h6f:s1jm)i (rr +pl em:4zbfjljqw)4o odg with spring conq4o i(ns))jm6brfm0:7+ 4lhfrojjwl p: e d1zstant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red2ctjd-h57 wd xqo+/ yd light. What work is done by the friction for y5 xho2t-qdc/jd+wd7 ce 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 a:cfa7v zq54w 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 q f4 :wc5zaa7vto 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 surmg;h a4 ct1r 4t.rwst7face. It has 24 J of kinetic energy. The friction force on it is a constant. c at14t4;h7grtrwm s 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 masdi8y6k-kys c57kw 7zus on a level surface. The coefficient of kinetic friction between thesw7c 7dkyi8k y6u5 -kz mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the topd3r-j8h uen;e of a 50-m high slope. If the work done by friction 3j-eu8rnh ed;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 incl7odx 4g ..yf*,n,xspr)hs f hlined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average frictihf slx*7gd. nph). ,yofx r,s4on 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 roodmmc:;nz , nw*uk.g1n0 y ;iest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0; ;o n i c,kmz0*onuwgyd:1mn. 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 oigbagtn+3)o r5e ac05 f 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average fo+b0gtcgaeo ia 3nr 55)rce 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 boy using energy when he runki 7p i(i*f(hp7f.+ jhi6*eyde0sdgls up a flight of stairs 10.0piihl e+7ykf* (6g jipsieh 7d*df 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 object with a constant sj1duit -m( g kg)1qo3velocity of 5.0 m/s. What power must be de-k3q 1dg(gijstm)1 o ulivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs forv+q v:xyulgn+jk5:9 e 1.0 hr? (1 hp = 7 l:qyn9:gjx 5+ uvekv+46 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 oqs 9 a 0iyyxrtn3d-;p;f 500 W while riding. How much force does her foot push with s0 y aqi;; 3-n9rpdtxywhen 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 z:5az)1 o-lan pzlxg 3bg/ts( to 25 m/s in 7.0 s. What is the average power delivezbgtg5 1 3(l)la p-zaz:xson/red by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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