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

1#

What is the correct unit of wor1kl*0wbkaw5 u k 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 ifq5 now +zb1bj, 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,iys tnvu5 .ao9:p j*c3k7xm2s**gdcy the amount of work you d7ju3co iy *mcsy*gx: *psd5 .9kn2atvo

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 r*+4u pf2smas there. How much work is being done in holding the box *24f+msrpuas 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 forwardqmn7. oyb9a0o6 pvxz7ht 5v.v at a constant velocity carrying a 10-N object, the a vx6t .v7v.5ozyh0omq7a pn9bmount 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 i,k9 o fms)b(5b(qgzt) ngj xyc:hd6g/s lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was donf: k,q byxtohmgjd nz(c))g b(65g9s/e?

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 pwo ba jp.gbw.ji ,*(jrv 14v*object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravity ws4xbnejq13pp(l6 -wc h h tk81hile the ball goes up with the sign of the wors ch1b(h6k3ejxn8 pt41lp- wq k 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 versx hkdq1 vd:55lus position (F vs. x) graph, representsd:dvl55k1h xq

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 represents the work doa8 9l8tx nl0pgf7 suov*h+ yccxyf*/ti, (8qine by the8+*hvs/ yfa*(9ly, 0i tio xcfgpt x8qln8uc7 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 enovbb1q1 x0r,(5-uzj*zn*t zhj wnfsib 5)n 4 lergy

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 tfnxf (jm:*ci 5fu,dea / c;px-he 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 object's kinetic ;4em bk)iad)4) ueyxri7e p0y 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 speed of themp2pobs62nj;d q2n 3f car. Which statement is true about the truck's kinetic energy compared to that of th q o3; pmpjdf2n2b6ns2e 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/ym1d cf djf5f fxr8b *up:s75 half the mass of car K. The kinetic energy5udc/:8dffsr1fpx *jf 5 my7b 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 bc wp+ czj:nq)nv 3a4o 0os22m; 9hwgbvounces back with half of its original speed. What ismwzvwc0ob)c:9nh 2n+gosv4; a j2pq 3 the 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 agt.*;rbi /, (i olnmolnd a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's b; (,irig/ o.*mtoln lmass?

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 ism 4 .km*uv(w/tw hbqn8:s *vtn moving with speed 4.0 m/s. Both objects encounter the same constantmn w: btv(u*mqwn.*/sh 4v8 tk 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 gq apl 5;fh84vhtgv3 (panic, and skid a certain distance on a straight, level road. If you had been t8 h354p( ;tg lqvfhvgaraveling 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 ellipticxvg*ldb1g( /-s e-xmmq1jvo3al orbit. Neglecting any friction effects, what happens to the planet's kineti *vg1/j1xodqbs3m-glxm-ev( c 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-energyel f+uqi*: d4a principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative po y e,p8cr byt.3ie0j(otential 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 heig4i:ha5kvxz)a + xac6)b .frixgz :e2fht h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy fhe cxx)5bgrv 26) aaz4ki+ :f.xi:azof 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 cau /p ,vv fw(cm,, sdft-s:wv+j;kpxx)nses it to stretch 5.0 cm. If another 0.200-kg mas fkw(pv dm,,;vt,xv jf)+wnsps:- /xcs 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 0yqgv8 szz /,8k2afri.5 5vav xzdjj,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 ex0s7 b c/vx u07l;qrutnergy K, to its potential energy 0x/u7bs0r 7xtvqcu ;l 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 drtz4y, ,g0,yuyx zms .wn 6g /6mvohi gc*a2o8wiving 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 ( p1y2ffp:cjqqrz e45d7tt3aa very heavy object are sliding with equal speeds along a level frictionless surface. They bd f47af1z:e(p25cy rt pjt 3qqoth slide up the same frictionless hill. Which rises to a greater height?

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

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses q:as ;+ ihfa(6:cd oxth,j ds:$m_{1}$ 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 mechanicalz( i0eqsp tp(k9jp2;c+.ukj e energy for conservative forces.t 9+pjs. pejk;e(u02qpicz( k

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 thel e 49zsegnt1kz5t(+a top of a building, through the air (air friction is present), to the grou5z e1 kl4(nae9tgst+ znd 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 distance and gains 30 J of kinetic enajz cr 8*)did3ergy. Do not ignore air resistance. How muc8rj3d i da*cz)h 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 distance and loses 30 J of gravitational potential energy. on j:,drc1s j* Do not ignore air resistancon*d1c,jj :sre. 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 energw -ugu*):r4 pz/xuls sy.

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 ;m m,ek87 nh3uav4qxb

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unih7-r 6kw7lgvvg -l;dk ts?

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 unit of pow,miee;,e ay,k gyc 7+q 2me(gser?

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. To do 3,*(hgejdhjs; -(u1 l png gxxso, pduxh sen xgjhg,g;*3-l(1(jyour power output must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine mus-qyeosprz ) 8 qe.onb(/o lfx) weu.46t

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the obj,5okccy;fkq ,ect weighs 90 N, how much workocc5,,ky f; kq was done in lifting 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 distanazukq*a16/0/n 4 fk fzuyorq-d-q(j lo4j0x ece of 1.0 m, at a constant velocity of 0.50 m/s. What is thj1/6-/ d4z e z*qorxuk4(jyuqaokfn- 0a 0qlfe 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 iss yhb4pcp7/q4tz(3e t*x q)kr pulled upward with a constant force of 5500 N for a distanc/rhpkq7tez ) 4p cqx3(stb y*4e of 50.0 m. What is the work done 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 a constant force of 5500 N for a distae1t3h8 q;(w,t epnok a6,fz mnnce of 50.0 m. What is the work done;okte ( f tw,z6hnpaq1n3,8e m 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 axvf 56 iy(tgt9 constant force of 5500 N for a distance of 50.0 m. What is the ne6ftgxi59 y(tv t 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 alo 3.dxbp;l5b6taxa .n3e-alo t ng 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 slijn7y jetb7/lbg+3 x nu+8 x*psdes 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume nolhoy9 k(fl.nd4e7 2(f p5res g friction), with a force of 60.0 N atf2nfop4(ld(.79s hge re5 ykl 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 th m-vs2fm7 kf* h(adln1e direction of the force. The graph in Fig. 6-1 shows the force vervf-s1h (m2am nf7*dk lsus the 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 gra4jh/pw cjzi )(ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the j hz4c /wp)(jiobject moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the directiojl-g s l45y:zhn of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work dony5z -lgsj hl4:e when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 o (yg;pci+ 9lyqf the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves f+g;9qy py (lcirom 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 (initially at rest)fut i, :8n6ht +uifs0x across a 10 m level surface. What is the finnhf:60uti,su8x i+t f al 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-kg carfz5ff;41l f+ vimldy8+su2 lut (initially at rest) acros4zsff8mv i+u 5fyl1 f d;2ul+ls a 10 m level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m)m i.yzrl6tcg ;wg(;j/s. How much work is required to st(il;ry .zm;6tc)gjgw op 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, whmm8asl3( k-lvm0kw . o.z 3ketat distance is required to stop a car movsk(.3ak0mmw l-tmo 3 l8. evkzing 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 diq9 gqw(p3clws1*b2:qv cn0nd f*p;mart. It is cocked by exerting a force of 20 N over a distance of 5.0 cmiv*cgnp*qfbm qswqp(: dnwc93l0 12;. With what speed will the 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 componentgw4dzr ab j3o.u+e,8 q of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and mo,.q j3 zwuge4aodrb+8ves 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 dp+ l:raa ffost+)ho/v0gcp b.j1d ,b+8 mhi2 hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force pdm/+ 2c1sfj8ldb+ + .abt, ri: g0faoh)ohpvacting 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 mos iwi*eu //.td2tb as(;m: kvgved from a height of 7.00 m above a floor to a height of 13.0 m abs//.( gv amttweb;u*:s dk2iiove the floor. 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 planezi.x ;z lzr49n. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionlesi4 xnz9.lz ;rzs, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the springzw+q f +c8*jrl to stretch 2.0 cm. What is the qzcwj + *l8fr+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 much pote+xa4ilfo i*w :jd i 95 hnvd8rkt75j6vntial energy does+9r:l5 j7d x6nv4ho*wf8ik 5 idvijta 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 required to compressfsl (:v ijsu+8 an initially uncompressed spring with a fsi vl8j+ s(u:spring constant 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 /cb8wuf+7hrb constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretch/ +uhbrfw 87bced 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 constantj y.+ /sttwbo eb-foi7 g,lf)( of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an addst)bf +j.t/gb7 ,o oy(w flei-itional 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 toplq :iur1:1.i rnzut /rf1b-hzy;fm y/ of a 50-m high slope. What is the speed of the su:1rm1. qlnz1;/:hf/byy fzri-iutrlier 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 ijoi s 4i68 l2oskd-2skg, pushes off the top of a hill with an initial speed of 4.0 m/s-s62 i4dsk8 o2siolji. 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 frictionless inclined plane. At the boj 55wpth lqy.dk40e)7 9ilsym ttom, it has a speed of 9.80 m/s. What is t)swl4 heq97yk .ypj5t id 50lmhe vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70pj3zv3cd,o k / m above the floor, its potential energy exactly equals its kinetv3joc3 zkd, p/ic 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 N, blasts straight up from ground level wi4ytwp 0q6ueb*a0aai 5th a kinetic energy of 40 J. At the exact top of its qet0ywa 4 ia5bap0u *6trajectory, 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 Jh92*yl jpxw iwf2/sc -ol/yd;. At the highest point in its trajectory, its kinetic energy is 120 J. To what ve/ihscldw - w/p2*yy2 f;xol9 jrtical 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 frh (/xo q5xe-njom rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect -xq5 ohjnex /(friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m abo(d,agg4 nv d,b3a:fft ve 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 g4,tdafabgnfv3:, (d 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 ljgu/4tco0 q 8w:yqg4of 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 next slope, which is 45 m auq/w :tgoq 4c0gy48l jbove 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 its swinssxl* ll e)j-lco (09mg (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axis an w-nmyxfn+wpt qik)-k-*ms .;d released from rest. What will be its speed at the bottoi*np-m-wfkm styw k ; -qx+n.)m 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 hori)n1 :p2wc8tzj (+rt jx ui,wjwzontal spring withz)2ir(u1 cnpww 8+,:jttjjxw 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, sloww(/zkljoc b+ 7e 0;cpts down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheecbpj ;kt+/o 0l(we cz7ls?

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 jg( ixbrw-b/od ; /ukh2fdj(50z g(yesurface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will (rz/wixhdg(b2j g dfy05(k;oej- /buit 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, levelkn4d.+4dwd1j; da 6v.ohs vzx surface. It has 24 J of kinetic energy. The friction d kzhs ddwjv1+x6v.4.oda4;nforce on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg 88h avs 5 km1cx3yi vy(8prwu(mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is 83yca(uis (hxprm8w5 v81vy k 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 50-m hib)j-2 el(mak ugh slope. If the work done2e(am) l ub-jk by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and ris;(rr awzk ho:(es 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on;:wzao(rh (kr 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 rel1hmns(.n kf2 feased from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0m .h1s(n2kff n.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,f n3e) x4mmt6;z 6ta q/b1vpe ddt)-tk and strikes the ground with a velocity of 7.00 m/s. What average force of air friction ac dna m6tm4 txf b6)kvt1dz;t-/)qp3eets 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 *y -tr+wz4u v e)kcl*vboy using energy when he runs up a flight of stairs 10*lkcuvvrwe) -*t4z+y .0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. Wqrzq o00t12 vnx 8bsvd, c;1x*tfo;z8zwm;rdhat power must cvbv,mzqx;f2qrodtz10; xn8s* dtz ; o r18w0be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energ z9;t7zd 8dofjy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 7469d7jdz8; otzf 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 riding. How much force does hef;eif/ su*8 oyr foot push with when she is tri/u8fyo ;sf e*aveling 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 ys( le(u/):bj.ipbyp.0 s. What is the average power deliveredy j. b leui(b:sp()/py by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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