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

1#

What is the correct unit of work expressedw.ogx q6ad)k37xli *r in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no mfl*g4c c1c /:.y acnfkotion?

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 hamf;dhc0z 8 x08yy vcf:rd against a stationary brick wall, the amount of work youy z y00fdf8 x;c:v8mch do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and gh5lqzx)5q ) his being held there. How much work is being done i)5zq)qgxh h5ln holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-N og1s.zu gqabr* q5 ni0 q:8g+gvbject, tubi80gr ng*5:qz.1v ggsq +qahe amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned tkqtl- gj0pk, (t3 ,hodo its original position. If the top,th q 0kljd(k g,-3ottal 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;-kgq6on0wbb 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 sj 2fw3u l3rtj9ign of the work done by gravity while the ball goes up with tjjr9 uf332tw lhe 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) graph(4qs0.nbbso. tns k,hib:;a z, represents bo4qb.0 i,nsbhtazsks; . n:(

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represent+e, c d 0fjj;ykv/qqv:s the work done by the force k vj :cdjy/v0ef+,;qqF?

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 kine rpaz,zu)rhmw 34g z.1tic 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 the object's kinuh erw)2n tvtl9zc 0f i8f.)7ketic 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 object's kinet4odxbigok)q) ps iy k7468*yaic 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 .ittm lg/n; 5gspeed of the car. Which statement is true about the truck's kinetic energy compared to that of the carnl mt/5;gtig.?

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 half the mttn.blqsy, j-s+-, uyqeb9s )ass of car K. The kinet,+q eubt sb .t-q9syl,-)snyjic energy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bouncepi8rv5)ln 2qq s back with half of its original speed. What is the ratio of thq ) p5rnl8qi2ve final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speedl2wa0e qzl9g( of 5 m/s. If botl 2e90gzq(lawh 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 speed 2.0 m/s. A 1.0-kg mass is movylz)6 s88yt o ftr7h7oing with speed 4.0 m/s. Both objects encounte7y6)r ty 88oslo t7zfhr the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distacl8jin o)vr 9c 1e)zh8nce on a straight, level road. If you had been trr98clc)ih1 j) nzv8o eaveling 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 t5:u. o v8twsiohe Sun in an elliptical orbit. Neglecting any frotsi :5uv8 .woiction effects, 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 prys; qd ri).j0ninciple.

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 negati1ya0, wqu c r(8.ddsmbd2,z svxit:x- ve 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. iiwe8r.s zwao .jh/g:8ju *a 0 gy/el+ A second object with four times the mass of the first if released from the same height. The potential energy of t8jzi:.wa ./h eal8rj* /uggy0ws +ieohe 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 +hfsxf i99 j 76c8jehcend of a spring causes it to stretch 5.0 cm. If another 0fx69hci hsj f8e7 j9+c.200-kg mass 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 ejlszn hi2 2dhy,kh9n 1/i6z 7energy of a 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 tree. Compare its kinetic energy K, to its potentkx/tiv78 0g0kjkxr (f5sgm.y ial energy U if.g 5m0/rkjts0vky (7x8xg k.

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 dri7 zynuv531, zj(f;gf u nju(tgving 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 are36c ru-j sp()/tslcxb sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a great)u6jbtc3(/lr sc s-px er 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 41)lcmpq 2khkk3qo)/e * uxdb $m_{1}$ 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 mechae23zo-xoki;eclm sc6ra: avcc( .-k 2nical energy for conservative forces..lck-a: ; ee(c6vrcoxz32 acm io-2ks

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 bjk akq2ce.w)1/7 g aow7c/tu air (air friction is present), to th/1t/ eq7jb7)uc . wgoka2awkce ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some dizqyzks:i/ 0:wu/g2b lstance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitati0bz2kz:uw/ qlg y/ :sional potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitation9)3f roqf m6bwal potential energy. Do not ignore air resistan)fr f39w bm6qoce. 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 conse* xr:we+oqa/w.+(va; vax zxsrvation 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 isyu 5jr 0t5/qklrjy6tp )j fe)(

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 unitv1;ru u3 vemz*mbz,8-x)wh 7dgica;f of power expressed in SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unic( (/ s-z*f 4uspsn*b1lxcdbj 9 jdr435dtsaat 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 uy ;:kj- fr( *zd:eflsw8cf p/in one-third the time. To do so, your power output must have 8yc-k j/(duffps: fz*l:er;wbeen

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 cibj g;ba ggiw 89 e+l,4jv8z;u2lj6olar at a constant 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 , 8g rl d-64gwxotoyi*b,kgi3(v qri 5vertically 2.0 m and held there. If the object weighs 90 N, how much work was done in liftingg (4grg t8 *y35i boqxlw,d or6-k,ivi 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 consf 32mg/ra*a:rqj 4r,jpoe-s ltant velocity of ge:af,/sp o r2jl4*-qarrm3j0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upz 9zjidvd;1 6(du1a2;sl*aj h7a rhep ward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by ;1a ;dhjvzp2 1uh9rj*7 a(deadz l6is the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 55vt/ua .g)9+flm2s vu n00 N for a distance of 50.0 m. What is the work done by the weight of the elevatorm)+v s. 2vn u/ftugla9?

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 upwarc.s005a vjaxrh6 /3kjq mp w6xd with a constant force of 5500 N for a distance of 50.0 m. What i 6h/q j6.x0wj3pcvxskmr0 aa5s the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along a :r7 tnzd;,/ .x3ybsx+ i*u gx3yirkbb$37^{\circ}$ 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, ituv r t0t43r hj5ogl)2df2knbs ;-1hdnclined 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 *6virmz int-pu u*2 *lon an icy surface (assume no friction), with a force of 60.zuli*n*-it 6rup*m2 v 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 graph in Fig. asb qaya+dz9k8.y:. u 6-1 shows the force versus the object's position. Find the work done when the oubs.9 dq 8y+aaa.kyz:bject 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 gra1/lsp*1gi ss (wbg vf0kz.n/ jph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 v 1/1.j i(bslf*0sp /skzwggn 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 inob y(2 bvt lq-7wjug(::7pg qa Fig. 6-1 shows the force versus the object's position. Find the work done when the object moveg7b:lgq p 7w2:bv yt(aquo-(js 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 direction of the force. The graph in l9thim4p01 n jg9d.bwFig. 6-1 shows the force versus the object's position. Find the whd91n wli gp9.0b mt4jork 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 appliekyx42 +rtnpio/-yj5 th (od:si9uuw4 d to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kitk:i(-unsyi5u+ p42tjw 4 9dyo roh x/netic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initiall omo*sl owy86 ccp13/zy at rest) across a 10 m level surface. What is the final speeos1o6m8zp lco/* wy3cd 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 speuq 8ml zm:4yp;ed of 5.0 m/s. How much work is required to stop the mass?z uyplqmm4 8:;

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/nqpm6),yio;, g2crw:fmdu7u s, what distance is required to stop a c7 cmi):2;yd,unu ,f pwqrmg6 oar 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 cqd. vt*yj4xfm.t+.s r ocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart tt*rqs. f+jmvd y.4 .xleave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a verticalnki*tbpa2i ia3 7p 73g component of 60 N. The force is applied to a box which rests on a level frictionlessipn7 t73k*i apbag32i 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 horizo kcn1x/wii 8;p1orb5woi )w3yhu-g7ontally into a bale of hay, striking the hay with a veloc5h8irxc) ;iyoo1n /gkuip1o w7wb- 3w ity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m arcm(6bn 4asva9 oj,5 hbove a floor to a height of 13.0 m above the floor.4cavsr6ja( no m5b9h , What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and risevls 7)6(m(ut hqypx yvc:r2 4i.0dcm js 2.0 m. If the plane is frictionless, how much work was doyi) v:hdxu l7m(pcj6 0c.q vrtmy24s(ne 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 2.0jud) ,z72rr50rkov smxx8*mi cm. What is the spring j7o82d)i *s u rxm5k ,zx0rmrvconstant?

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 sprinl5vvzt (7 nk-ng constant of 60 N/m. How much potential energy does it store, when stretnvktv5 n7-zl( ched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncogs gg6j jh4hkvz (927kmpressed spring with a spring constant of 25 N/m by 10 27jkg4g j9z 6(khv sghcm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m from8)kis4w5; xs h;msv.yl x1fr u x = 0.20 sxk);;.rsv1wf4yl 8sim5 uxh m to 0.25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. H7,(bp h+(wis fqz ,z.rhc.zq row much work is required to compress the spring aw,cqh.hz.,q+psr(i7 fb (zzrn 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. t,1env6:v+lzc5 yvqv xpy-x from the top of a 50-m high slope. What is the speed of the slier, l51xey.vvvctvyz nxq -p+:6 on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speedswl rr) 4s4xp- of 4.0 m/s. Neglrw-ss4 ) r4plxecting 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 zq1 bskb sn sw8g a54e0)xw8z yhr39,)aj8ayzfrictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is )g48w kz wbeh5)yqa8x8snja 1sybz0azs39 r,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 floor2t,j: (7 i3sugxu :5jjvbkotn. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is b: , tvj23jg 7tu:5snjukxoi( 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 10v : gk.kdt ;9:dawnmvm ,z8tp2 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 9g :d,:nm;t vk8awmv. 2tzdpk 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 energy of 6r. f2ei7t0fohrw1n,qey;+sagk6de220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To whan dr66ks+aqhwoe;,e yrgf.72 ei1tf0t 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 za/xnfuy0s g/(a+k 9oj2s; q ta 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 above the bottom of the0yzxjg t9ss/; nkoaa2fq + /u( 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 mf4 *: sqxk8liq/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 roll4qfski l*q8 :xer coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of;u6o r3k-wg/a i9kec b a dip with a speed of 25 m/s (See Fig. 6-2). / we ugb3ok;6icak- 9rNeglect 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 bz psjm : g(a+qp,jp;)zogw 11 wf,f)taall 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 cqy/ /pkw3gilisr (6j1,rqb yv/y3c ( km is pulled 30 cm away from the vertical axis and release/br, gwqipyy/lk(jvi1 c3 /3q r6syk(d from rest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially unco hlr0 h0dt2 kv 8dugv:/jral3+mpressed horizontal spring with83+hvu2 rh :jdv k0drt/0glla 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 22sjf9oxp2h7-w cq8om( 7s ;rpe m/s, slows down her 2000 kg car to stop for a red light. What work ispm72 7;sw(9oe xfjo 8-prh cqs done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surface isn hi5 dixd(ysg hl+2).o- o5.odqj5ak 50.0 N. If the initial speed of the object is 25.0dnoyhg55 hi d.si xjo5+al.o k)q(d2- 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, level surwivbg)r)+fsmy7)x/ z face. It has 24 J of kinetic energy. The friction force on it is a constant 0.wgvm+)x7y) i ) frzs/b50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. tqp): p.a01rt2qd5r akt0sosyhlm; i c*;ez 9 The coefficient of kinetic frictionstc.tyz;;qel2 rr h 5s 0*oaiqk0m ta9pdp1): between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the toz7iaj :ngaa kru (;k(+p of a 50-m high slope. If the work done by frictiona7:+a k;njriugka ( (z 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 and rises ua9 e kf0d6/memw vb142.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average vbf ku91w d0m/e4eam6friction 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 5yudf siqn9d46;3og6 ams ;jqfrom rest at the top of a plane inclined at 20e above horizontal. The coefficient of g5madd6i 3so4sqjn uf;y96 ;qkinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the g9 f4.1z;k( kozy yrqgbround with a velocity of 7.00 m/s. What average force of air frictioo(zfbq9.4 gy1kz;k ry n 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 runs up a flight of stairs 1 ) 23zhc,;qfidszk)on0.0-m 3do;qf 2zn) zsh)ic,khigh, 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 velocit luvtx3(5/io;e ucxss87w y-c y of 5.0 m/s. What power must be delivered to the object bx7v ;e/w y5u-l(xtc38siosuc y 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* xb0v2fzh .9y2qhjl;1ylpac for 1.0 hr? (1 hp azx9 jl.2q2pv*hb0 1yy fhl;c= 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while js61x;fq6yqm2h* dl e riding. How much force does her foot push with when she is travelinjq1ymqf*e x;hl66ds 2 g 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 txy/: kuu+u:s3 trv epxy.)p re) sk1.fhe average power delivered by the engine? (1 hp = 746 Wk.u /s r yupxev:)pk3+1)tf: srye .ux)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95