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

1#

What is the correct unit of work expresse:ce2ii. f j(p3k/yw /nj-eex cd 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 therega3 qel*u;m1wg(n.ym , wmb*d 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 amounwww6x e w:v86ut of work you d 6:wwwe6vuw 8xo

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How m5 mwhoe)np xyod57-0ouch work is b5hpodoyx 07mw5o e )-neing done in holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forwm0-zf9nv y4g6/l84( iusau/k xznht rard at a constant velocity carrying a 10-N object, the amount of work yi-/z84g k 4 t rsn6lna0(uy9h/uv zxfmou 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 verticzxn jaax.mry:id3f6k 2 /-q+gally 3.0 m then returned to its original position. If thx +/2. jng xriqm a-kf36:zadye total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on +dmi),(kw,xhbp9 pzc 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. fps)zn1h r--y Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by yz1--rhn) fps 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,)m;h1qusrr i+ representsrru+)1sim;q h

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), whatqb 8lmx)k9)ms uj fo51v;affkj(a*y6 represents the work done by the forkk(yu*jx)6fm9j1om a ffq 8;) vblas5ce 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 posi e qk1gv*v1arz hcs;1q9+pom;tive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kineticgua)p/s9a )x5fvsu3i 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 kineticvx)k mt8-b(in yg2/ wfb6ta8n1kro/r 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 s:9esvdez3 k .kp2l/6xs t)cah-3ux a dpeed of the car. Which statement is true about the truck's kinetic energy comp hs323pcu tl z/x-) 6vdkxeeksa9.d:aared 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 half the mass oikvj((cspx+j5d5v4w f car K. The kinetx( 4 p5w+cvdsv(k jj5iic 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 bounces back with half of its ori80mb ,ppblodh 9cm,*b:ci fpu+:m7ldginal speed. What is the ratio of the final kinetic mcd+0i:cppd8,b,p hb*bu9o l m :lm7fenergy 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 movin* y zwg;,s:mbs 92yj6r yze,qkg at a speed of 5 m/s. If both objects have the same kinetic energy, whats*w2 ,zeymrbj qksgz, y6: ;y9 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 y8ys q3kt 5s/v1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whsys/ 3y8 tv5qkich 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 carthr *onf7.ds6 nppo/( in a panic, and skid a certain distance on a st6ns7t p.h of(r/po n*draight, level road. 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 masxc hw ,;hpfkj5 3l j0blzs,w)(s orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinet0c;szpjh hjk,xfw3 b)w ,(5 llic 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 gbrwo0pgb4: vn:3zp ia8*( mkprinciple.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system t: 5i.q4xxo jeto have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height k/: .ayh)tnhrh above the ground. A second object with four times the mass of thtk ). hhna:/yre first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes inq. q3 my+*ec8lz,,ryj7dywy-f)z i k t to stretch 5.0 cm. If an)m3zjyi y7 .q-fzw *+c 8yyd,k,q elrnother 0.200-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 energy of a syste-9y: w2d8s amxukf 1mkm

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 ar+y kjbf,-l *d tree. Compare its kinetic energy K, to its potential energy U.y+-r *lkdbj, f

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 c0xj1t,neg hm .l;s.p21es dwcar 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 heaid55v9t2s9nggaqzmw i(7y 5mvy object are sliding with equal speeds along a level frictionless surface. They both slide up vgmg2iaws t79 d 5iq 5n(9myz5the same frictionless hill. Which rises to a greater height?

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

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses qs9oe *z+s8nb $m_{1}$ 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 conse 1v zp*ly/lijdzwrbn3,b;:j5b a mn( 6rvative forcesz:61 p,rn5bl(mb3/ b n*zlwijayvj d ;.

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 f;bc0 ayy4w+x va-ans+9l kk+air (air friction is present), to the ground below. How does the kinetic energy04aa kvl;c -kxb+y+ +an9fyws (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 distance;c4xh do n(0. rm4e/wy j:jell and gains 30 J of kinetic energy. Do not ignore air resistance. How mrxjmdlej;y:e n4 4(w c.0h/o luch gravitational 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 distanctbuf8 qg+7*dx e and loses 30 J of gravitational potential energy. Do not ignore air resistancexf qbt g7*u8+d. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of enbjmv zdz:(,r fz251d fk.e/y )on 4kmoergy.

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 isdgf,3ca eg81(z-rc qheaz2g;

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.r8q) i ehl w5.,kcx(zu)pait 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 uni,oywzxg-6es k dn )*.lt 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 u x(:nx 77 :w1 o. exq3lbaz/aecisl3ptime. To do so, your po7:xexui 73aec3 .snpwx:/q ozabll1( wer 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 acceler)k ) 5kgrhx;thation, 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 2.0x :l,3zkba7p ,oux *jt m and held there. If the object weighs 90 N, how much work was done in liftijl *o3 7zxtxap,bk,u:ng 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 ay7l c5 ob+nd/z constant velocity o yn5+ bc/ld7zof 0.50 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 upward with a constant force of 5500 N for a distanm2v0zsu: f z7w9 dbdo,ce of 50.0 m. What is the work done by the 5500 v b7mzwsd0:uod 9,2 fzN 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.p-rtie :5est of 5500 N for a distance of 50.0 m. Wha:-ptr s5.tie et 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 upwardv c6eke,nc 6g: with a constant force of 5500 N for a distance of 50.0 m. cencv6g,k6:e What is 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 si 5 k;879a/hadi7uvgq8fu jj9m,h zs $37^{\circ}$ 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.tgvit,23a l6 a0 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 on,x4qhqe8d 7j;q9 vbSarah in a sled on an icy surface (assume no friction), 4h ovxbj ;qq,d 7n8qe9with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fip;z/*r q8ug;9 exjb bqg. 6-1 shows the force versus t/ur;g* xb89eqb; zjpqhe object'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. The graph in l :1lo0vp0s2paf 1kqgFig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4 1pvl q a00fskgo12lp:.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 gr75 3tce9m uik*6t 4b ear0cnclaph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mov9ba re5n40 ut3ci6ekct*ml c 7es 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 dit8e- h(jl2m0e rb:eebrection of the force. The graph in Fig. 6-1 shows the force versm0ee :thl2 b 8-ber(ejus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initiajg) kjbe y7j7x2g.gy4 lly at rest) across a 10 m level surfjjy2 77gek4gj.g xby)ace. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 5 sv7j9m+k.wy422m r-xyqwffg 5-kg cart (initially at rest) across a 10 m level surface. Wf +yj sgwq m97.ymwf24x-r 2vkhat is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is requiredq/o b1a;wykog9n ph85 to stop8o; bh/ wpon1 kaq5gy9 the mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distf,yek5 q-t 0vj8zm3+q6wnzim ance is requirejv ,qymze-8zqfn 0mwk5 6+it3 d 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. ay rqc+a s3ug,0gb*,t1 6wfqaIt is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the tyf01g+awr*g q, su,a6ca3bq dart leave 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-978/jvqghn nir jf5 czgs:c/ of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. s5:g z//grcj n87qv-h9cjnif 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 ha wn l,/-en/ea /2lqcbby, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cmn /e ,a/cenbq/-lbwl 2 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 heef ;bbn9/;/ bfzuxudd 52tti (ight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravi2 ttf/x;dbzuu f 9d(ebni/ ;b5tational 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 plan6)nelqm0p*8r: ;itaybbol *r e. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the puse6yrm b 0itqbnal): *l8*orp;h?

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 toy8dm(tv.2.u*dokdo+ o: vt aq stretch 2.0 cm. What is the sprqvvdo .2tod mdutyk: *a+o8. (ing 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. Ho 4(;yyngdj3ox chmh s1r ;aa;r/ps4f9w much potential energy does it store, when stretch;rcg s;;(y /ody apx1 3hsm4a r9f4jhned 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 to9 nv7f tj*ep44 gm7dezr -ka/ kk7k3zi compress an initially uncompressed spring with a spring cozkpg if m4dr 39eka/jvkt77k4e n z-*7nstant 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 spring of spring constants5(fvrx x 2e,td: yyhp7r wb0;m3e(s k 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0p7:3kty 2ex5;srrf bm, yv w(shd(0ex.)

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 initial)ydlagzw7mxvv wv 3+7/ de 3k2ly compressed by 3.0 cm. How much work is required to +amez73 / xv wvwl3d2v kyd7)gcompress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is the sfiipg, )3d2s tbikr8 5peed of the skier on reaching the bottom of the slope? (neglect frik 3bsii i2)t,fd85rgpction)

A. 22 m/s

B. 31 m/s

C. 38 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 sppk5e.6ict;dv eed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping dce.pvi k6;t5 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 frictionless inclined plane. At the3(:cjoz +wjmkq 0*lml bottom, it has a speed of 9.80 m/s. What is the vertical height o0m+l 3:k w lqocj(zjm*f 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;rut-0t8y* i5/ zpx4 lh zsbeuo the floor. When it is 0.70 m above the floor, its potential energy exactly equalhx -u85;l/ eztt4 upr*b0izyss its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 e p+fe c.s3e/hN, blasts straight up from ground level with a kinetic energy of 40 J. At the exact hpcef.e s+ /e3top of its 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 energy of 220 Jkl2n; tcd*oh,fad+ l; . At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it risch 2k+*nlo;atl,d;f de?

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 the bottom of a dip (See xr5k (jvifnrdui0.m)n e5:x17h;kuu Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whicukviunn0r 1hx e(5rm ;jd:57f.)ukxih 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 45 m mo:ha:s(qry 7above 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, whiahy:r(o q:sm7 ch 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 ofplky*c4iqd0w l;yc 7: k+ a3de a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the yywac ;d:i7ck +4 de*lql pk30next 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 0n n xuvqc6 :+k3fm2abits 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 2-kg pendulum of length 50 cm is pulled 0.21 m away from the vertical axill/p3 sc(22 s1aieb wms and released from rest. What will be its speed atsia3 1p/2sw(b2cmlle the bottom of its swing?

A. 0.2856 m/s

B. 0.762 m/s

C. 1.142 m/s

D. 0.952 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 unghnp+8w 5eta h09 jw0mcompressed horizontal spring with spring ahpe+0wt w mj5n89g h0constant 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 lsm05jorrx5 h f(lm. 8/vm ;jw x0ei*ekg car to stop for a red light. What work is done by the friction force against t05m; (r8xe/irhls50ew*m fx.v lmojjhe 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 surf8x irbyni*zkd)zodj5 6/ )2w wace is 50.i)*b6nzz/ widkor 8d 5x)wjy20 N. If 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 moving on a rough, level surface. It has 24 J of kineti fli)8lv a-z7yc energy. The friction force on it is a consvz7 lfa)i8 -yltant 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 horizont * qh/.maoorp+(qmn o ajt-1/sally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in nt /(s/ ojqq*oomhp-+aa r.1mits 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 a8 ah4h nen4vc j*z-au; 50-m high slope. If the work done bh*44a- ; vunhnec8 zjay friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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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 planet+g2m7( wj-w*3hp +z wcx-lxedqwc 2i 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 aver( 72g-tx wj-+imdpx*cwzle3w2q+ hwcage 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 releasetw9 v24xbeeh9d from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass aex2e499t v hbwnd 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 strikesfz h7hq5 )r8(wir(oqa the ground with a velocity of 7.00 m/s. What average forc(a5 fwrq( rq)zhh o7i8e 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 usi: / irw:a)onswng energy when he runs up a flight of stairs 10.0-m nw) ::s/oaiwrhigh, 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 vt yh5n vrl3b8(,8nn/ zf 1fqfoelocity of 5.0 m/s. What power must be delivered to the object by the forcezf8flt( f8bhon v1 3/ qr,nny5?

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 mot9. us.c/w 1v:5 bnypg2bnj ao-qcef0kor that runs for 1.0 hr? (1 hp = 7.pgv/nj 9fansc2u bbco w: qy.e-5 01k46 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 Wns, a7zhw9ai5 while riding. How much force does her foot push with when she s,aw7 9iaz h5nis 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 is the averatiy2v 2djh j*jrip*- ,ge power delivered by the engine? (1 hp*jjyv *ij2d-hi ,t2rp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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