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

1#

What is the correct unixa 4d+es71e-w nki q,v+kv52ok+ am srt of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system x q4oon;8f 5m5 qjjpb5e7h*1untck*w fb+,ctif there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of work yo5kk1-i8w-tb dwtlu8 hl su)q u46h)hr u d86i)k ru)luw51u8 b- hth-kqt hs4wld o

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 verticoam hm l1(kr-9ally and is being held there. How much work is being done in holding the box in this positiomk-hlo1ra9 m (n?

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 vbyv:p-.jwg 2l elocity carrying a 10-N object, the amount of wy gb2:vj.lw-pork 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 o-y(zq31 efbbvertically 3.0 m then returned to its original position. If the tooqz ey-f31(bb tal 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 an object do work on the obcl11gao6uf v7 :x 4n7qcbj-qtject?

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 grav u5ap .4zmqa;oe-s.ff ity while the a4 .;s5uf.q eofzmpa- ball goes up with 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*2n/.67n/rlhk am 0 ajvl;b mni(wejk. x) graph, representse bak.2 lhmw 0 (rk/6ml/nj*navn ;ji7

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), wj a0*:tmtzdzqvx2 g;9hat represents the work done by thet 2v9jg 0q*zx t:zam;d force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; mv^2$ is

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kinetic 3vfwqj-:u4fjxpbnt0h j0 8m 2energy

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 il4 *eoz6me9ags 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 the objechl1(mpb an.f5 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 twi ec,d9-x savj)80 shynce the speed of the cnc exd- svjahs) 80y,9ar. 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 car Jfuvd)ls9g)s2d+ h8 mm has half the mass of car K. The kinetic energy of car J, compared to car Ks2l9)mdmufg )+dvsh8 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 oiq /k/r- as2o 0iywcg;f its original speed. What is 0rk y;wgs2ic/q -a/oithe ratio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebbl6lb gx,jj:;we e is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio :l ;bj,x6 jwgeof the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving z y,/uqfusf80krp*b8with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object yq uzpr k0fs/,8*8bfutravels 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 certain dis d6twi qe( 7s,wdo/+fitance on a straight, level roww+ei7 otsf6 ,(dqi /dad. If 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 orbits the Sun in an ellipt g6ysd.op5fw m xkw,94ical orbit. Neglecting any friction effects, what happens to the plan xsy9f,5k md4.pwg6owet'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 tbaq7yni -2x-qkb)( v d:0qyw * aqc0pprinciple.

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 sysx i8n1w flem- d*ukt7-tem 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 fromzxu 3:1 fb,pxvt a1cu3 rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compx1u p ,fz31buav3 xct:ared 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 stretcj2p-r 8laz a+vh 5.0 cm. If another 0.200-kg m+raazj -82lvpass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a e;7asu4l 4au zsystem

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. Compare its kinetic energy K, to it0i rw.kp+b)llcmnv f*r;-qt .hlt5 1qy .np+js potential energyhtpf0) + qlrv-wmctk n1ipbq5+rn. .j.*; lyl 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 driving)i mt9)k9i 4m cxrkrw)s jt2;y 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 agr qb.brrk d;s,:t4 waytx3 i-o6+x/flong a level frictionless surface. They both slide up the same frictionless hill. Which rises to a rd+3rai 4s:q t b ,oxwf.xkb;-6 ytrg/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 z.,d bs6ypxkuwek 5zg 5g ff7 z9 b3(e2:zsav2$m_{1}$ 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 ofm/8is4:jt4lcm ym6 yk conservation of mechanical energy for conservative forces/ kmmt4jy 4mi cys8:l6.

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 fric t;( ivm*12gtfd7lb3 jsh;vzytion is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top oj2tvs7 d3mvg bzt1*li( ;hy f;f 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 dista6 xp-i;gqv*yb/oy. emnce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ba*ob y x6yp/ mev;gqi.-ll 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 3n 3fyz c7y4hfs;uffv*3xad n:c.(zs6 0 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy zy dcf.(ssz 6nn7cyv *x3 f3h4:fau;fdid 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 energye id,ohap j9v8g )b5zfh 5m75g.

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 is h*bxolif+9l7 af r8+g

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 inji7br 7);obq/p8 aljb 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, whi96cw n+9zn0mtyywk8f ch 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 one-third the time. Ton,m6ug)0mr.j+8t qh vmx vji , do so, your power output musjr0+6)xmu. tn ,vihjmvg,q8m t 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 j+dqvx rfz l; bv5;t:vwm*)l 4constant acceleration, 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 verticallyf(xd + +yy5h/w6 7/mlb ad72dken 7osacxxau/ 2.0 m and held there. If the object weighs 90 N, how much work was done in liftingwy l nx5 /d(auo7sc+ bf d26a7x+mdh/eky7/xa 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 physics book up in the air a distance of 1.0 m, at a czzju0xkzty0,dt* +w7x +v:ol* ml 4tx ly7m0uonstant velocity of 0.50 *4+ mkjlvzdxzx:+yttml70, wx *7u tozul0y0 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is2cpvio kz7z)b :tq +i1 pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work +pi1 tv )7qozb2izk:cdone by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with aty g,y1 / *ba2yh 1n kbadoaq)x2nk76b constant force of 5500 N for a distance oy1d y21t ab hk6b7)b2 yqgo/ ,nk*aanxf 50.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N :tp/pcy5w;u dfor a distance of 50.0 m. What is the net work done on the elwt /c;uyp:5 pdevator?

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 6.0j :2wrdn.e8 vq 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 fruit slides 8.0 m down a ramp, incl rk0 byy9dow dn62:(ykined 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 i :vkgue, ) .vrmu,l7rzn a sled on an icy surface (assume no friction), with a force of 60.0 m )ruvrue. :,l7 vgkz,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 diru.x-hj p+. +h1ijpgf7 kv9aipc1 +kyvection of the force. The graph in Fig. 6-1 shows the force versus the obj9gpp+ kxup7-1ka+hf j1ij+yv.c.ivh ect's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. Th8 jgsuzg+u: r1 ltx19dqs-zk6e graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves fromu -1 zu6:g+z 8dkltgs9xs1qr j 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-1 m7,- oksl3w.+/:n w nxydxwlw shows the force versus the object's position. Find the work done when the -mlow dwy 7skx,n :x/.+wl3w nobject moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direcj7z6g /xgyeb- tion of the force. The graph in Fig. 6-1 shows the force versus the object's position6gbxje-g7z /y. 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 555 +1fxbry ne-a6yyau9d3za) u -kg cart (initially at rest) across a 10 m level surface. What is thd3abzf a56xy9 y)ar +ynuue1-e 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- fxd7 jw7n/p9imy)+ gtkg cart (initially at rest) across a 10 m level surface. What is thegi)xm f d/pn7wj+t97y 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 spk;/uzls xy3 eck *6p.peed of 5.0 m/s. How much work is required to stop 3s6*z/puel.k;c pyxk 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.g;abr,x a3j,kt bmd9 /s, what distance is requir ,d.t kba;bg3jrxma,9 ed to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a forc+tz nxnx))ynt .s+0z,guu6hwe of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligibntu)u.gx) 6t,z+x0zn+ hs nywle 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 ak8em 6aems;; b*/vzmcomponent of 60 N. The force is applied to a box whime*m; z/6;mavska8 bech rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of haxcc8f1gubc82 o 4 q1oty, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. 1gc8 cbcqoxt42 o1 uf8What 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 f+)k:y -bqdgcd:xc 95u bo)dtc loor to a height of 13.0 m above the floor. What is the change in gravitational potential enb: godd:)-t ucbc) kq9dyxc5+ergy?

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 m wlfarzl.g p x vk r.);0p4ts)df*50 nug6bvh1 long and rises 2.0 m. If the plane is frictionless, how much work was done by ths 5v4ar. d r)u1f*gxkf pnlvpt;l6zg)0h0 .bwe 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 sy r 1 bv9/:0rljmt)cl+k2uhvmuy 6l h4pring to stretch 2.0 cm. What is th62y1lk9m0 yl cvu j4rv)/ mrht:b+h lue spring constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How muchb o0:i m7(*9puznklmf potential energlunm0p7 m*:kf9bo iz(y 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 remeabstvvn5w5bi )m50q2c32 2chl8 q o quired to compress an initially uncompressed spring with a spring constant of 25 N/5a83bivo)h lbe2c52 vqw0s5tnm2q mcm 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 st )fkpiq 5j7)zkretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x =ij)5 zk)7qp kf 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 sprinpie q/e ac/+o :w-o 6ic;mgd 0rzt/)fxg constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additagpce); eoic6ow/ qxd//- rt0+zm :fiional 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 fro.bktk s+k d-8 y+zugwz)s *m-ym rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect fs z-k)g. dk m8+*yusbw z-kt+yriction.)

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 speed10xoo/vm domj*rr14kkoc7a2 of 4.0r aomr0mckx/o v 412dko1j *7o 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 down a fra6m-jfei *rc8 ictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is6rmcj- i *8eaf 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 t:o; qdaisi +h;0ljij4o the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is i0h +;ai4jo;isqdl: jit moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground levevqmu raj0* waj2y6kt m 0*1+uzl with a kinetic energy of 40 J. At the exact top of t* 0 ym+ z* jmqru6a20wuvjk1aits trajectory, 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 a kinetic enerkeav79rmf6 s)(tr 0y rgy of 220 J. At the highest point in its trajectory, its kinetic energyrrr9fstaky() e 6v07 m 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 o5 (4vy ihg3qu45 m above the bottom of a dip (See Fig. 6-2). Neglect friqhu3ovi (y5 g4ction, 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 5m31zlbw u2j0 f.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 coaster at the top of the next slope, which is 30 m lmb 1f2u30jzwabove the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a spe(xk.b gdlb3r5ed of 25 m/s (See Fig. 6-2). Neglel.x5kbd 3b( rgct 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 bottom of it sam:my5jp bvh4s 9t,(e,i-tvs 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 5s 8rn fp7nl34v0 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the flnnp4vsr738 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 s4,bi2s 1 ed,vfikx f2q-em5l hpring wi 4ees -hi,l2vkdi, ffqmx5 b12th spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red lnnuli6 ,:iz1sight. W,izn l:s6 i1nuhat work is done by the friction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force betwl,voc33 kr v7lfv4eh4een a 60.0-kg object and a horizontal surface is 50.0 N. Ifl3, rv3lec h4ok 4fv7v the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is movingy)s)(*xtvi ng on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide)*g (i yn)tvsx?

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 appl m1 ygil3fqn6*divfb,( ew +: *y* ph1arn)gzpied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and trb)g*(*pphdi*l nwz1+: yaq f ,v 1fni63eygmhe surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 5/t0g7 fkhzp-r b*xlj7;a m6pn0-m high slope. If the work done by friction ij 7/;bnz0grxmh f6pakl7 *pt-s $-6.0 \times 10^{3} \; J$, 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 and rises u3* if qn3ww1h6ac7z i2.0 m. It requires 3200 J of work to get the box to the top of the plane. What wa1iih 63fw7uq3w zc *nas 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 inclined at 2r8 a4g 70xc6l1v dnvc/qdurq 70e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will bec c8l 7 0gd/xd6aq 4qrnvru71v 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 droplpjlf+nlfkzh3qk9a* 6)9 /phn,p + x.sm, p qjped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. 3sk ,j )pfp/+z99 .qp*fm,l6lh+kjxn phn alqWhat 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 boy using energjv0 jq)a0gvi35w ;v m, fq6.jlmuv,qey when he runs up a flight of stairs 10.0-m h.m,)v6 qjv03jaql0 wm;gvuvi q5fej, igh, 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 x.;7w,f.uz mj; irbulc:w ;h asol(1a an object with a constant velocity of 5.0 m/s. What power must be delivered to tw;swbl . h . joix(mrulfucaz7; ;:a1,he 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 a63g3h* cnho;o,fe3of6itf+t*ca p n for 1.0 hr? (1 hp = 74ff*ca3;f3, o oghp3hic+*t6 tnano6e 6 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 rateuh, riu,2vb/y of 500 W while riding. How much force does her foot push with when she is/2by,ur,i vu h traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What i*psnk ck2nje1*i /-f t3j6r pfs the average power delivered by the engine? (1 hp p-1*er 6fpj nsijf c*nkt2k/3= 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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