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

1#

What is the correct unit of work expressed i.oka9ezhj0,9 dl4u w mn 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 tdh1iu08j2s )cb lvt9q here is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount of womq* ug 66pspa x)ux(*jq,ji,b rk you bjqax,p 6sx ig(q *)m6uj*p u,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 g.:(yw l.nxcts t9j4ris being held there. How much work is bei:ys 4ljn9xct .g .r(twng 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 forward at a c rlml/ jo/5m:)7xg 8btym qhe5onstant velocity carrying a 10-N obt8:mlxlo5/bj /emy75 mq) hrgject, the 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 liftnl2s 5)y7wwxu05 xrxb ed vertically 3.0 m then returned to its original position. If the total weight is7n25l5xwr)u b w xsyx0 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on the gp a./uj*:bs 3f.;ow )o7 h(fxiskn riobject?

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. Compareuwk46ufw.*gv0di,z g the sign of the work done by gravity while the ball goes uz*,uv 0fww4giu 6.gkd p with the sign of the work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) grapa*63b;q yxhqsob9 i8w h, representsa9ib6 x ;wsq3b8 *hyqo

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 vsbj4ixts;;5j l,ki z l9d( lo6r. x), what represents the work done by thlb9;(xztd6ro4jll,j;k s i5i e 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 i0hx gcj/8:ki( 9kc zuus positive, 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 kin9nr.re) w3-w gp7i0w:qxcucd etic 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 th:hjr-lj6rj 2h -yt)59lq+0wf esr8oe aag) sye object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a care ur1xk6yq :7m, and is moving at twice the speed of the car. Which statement is true about t :rey7kuxq6m1he truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the ma a38z2iyuhg7a 5m9hc zev,c:uss of car K. The kinetic ene v8 :32 ycaczge,iha7uzu5h9mrgy 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 bu40hbejal/,rc0jm dy/ xpqcf 52,7le ounces back with half of its original speed. What is the ratio of them qlh /j,5e,/ cu0r aj70lf2bxpdyce 4 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 aosam 0 p0w;4jyc dpf45 speed of 5 m/s. If both objects have04 s5pmyco4dpaw; jf0 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 moving witof-*n awsw 72hh speed 4.0 m/s. Both objects encounter the same constant braking forcewao*s- nfh 7w2, 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 certainb0m23 b* di3 hkfgrejao6fm) r zm:2m/ distance on a straight, level road. If you had been traveling twice as fast, wme3d60i2ko f hgmbb: f*/mrzm3r2 ja )hat 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 mam p*db0p ,y+q3pmf 9xxss orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetf ,mqx pd+xb3p*y p90mic 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 prr/97l(va gq j9+zaon/ati8 vlinciple.

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 negc 7 :n4 iszxcya;u7dof. a.m1rative 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 hei( cj34w 7yadfgsvx4d1( q a(cq* y9cvlght h above the ground. A second object with four times the mass of the firs9d 7q 4*y(s a(w qyc4vvf1djcgclax 3(t 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 it to streqk78ga(wx0 jlj sz5e*tch 5.0 cm. If another 0.200-kg mass is added to the spring, the pot qw(j xs*jkagle8705zential 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 eneb4(k t lr2dx 3sh4ke8wrgy 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 er8g j bivt u7se,gh6gp0f1lscuv02;ts 87 f;fnergy K, to its potential energy U.t;ubsg s8vrpgvg setf2 1,u 0 8c7f0j;fhl 67i

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 d b ,)oxomd1i 7uiq0mt1riving 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 ve/bm x/an;v/, pu6nntta15cc4 mf3 zxnry heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to ax1p/3 f m4/tabm n/x nun ccat;,5n6zv 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 9 e32 f4mxx6c q 4mgvbk-c/ftv$m_{1}$ 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 cn.d .koz3) tohamqm7 .onservative forces7 mzatdh.koo3 m)..qn.

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 top6jb(nw zfwt+ b9 3ge7i of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground com6jg nbw+i7z9ebf (wt3pare 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 dish+.d *+rrby)vuh5fqt tance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy 5r.tfqr+ h)y*d+hvubdid 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 distaid ;pvy0t1 0sg)7 5q:t7 vxtyusp;w0oq kv0kvnce and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did th;; tpd0i7sgyvw0 5qpqotk:vv71xt v 0y 0uk )se 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 enec0lfywwl+0eq;) n5 zz rgy.

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)s s+b/g e3vkl

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 uni8r3 nloof+)evilen v1x.yhwp :;z 76tt 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 un*2nsx)x ix+gz it 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 the6kx30tg4 gjsriv,s ;ba k3r,z time. To do so, your powsxz36tsigr4 br,0 k3,j kvga; er 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 mujjuz.* f6squkn 8 +uh8 2t.ghlst

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 object9lmzb3y nr 6 )f7mtgp3 weighs 90 N, how much w)m bgp3f3yzm6 ntl97r ork 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 b mkv56h-m) mk8axgz)iook up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight v km8hk-))6m a5ixgmzof 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 distbk3 ;k +m7ajibance of 50.0 m. What is the work done m3kj+bk7 bi;a 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 cz ;svqddh1g1vcg)+ 0q onstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of t g +dg1 1;vv0)zsqcqdhhe elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constanls5a -. vya,yj* gz,vj )y/nypt force of 5500 N for a distance of 50.0 m. What is the net work do lyyyaj)vsn.5y j/*p , vg-a,zne 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.a5clj q 9s3i6afn4k9a 0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down r 8wv rpz9 ,8b 85yh8ftsxjc)pa 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 (assum/aq.v;0 c1llp-l4e6/wjc rjftu5 tfye-c 5 loe no friction), with a force of 60.0 N at an angle o cjf.c1tvw4 -rjeel/-0/l q 6f;5upl5l ctaoyf $37^{\circ}$ 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 og1 p(y m* h*o ;vz,znua8rb47ylalou 93r qd+of the force. The graph in Fig. 6-1 shows the force versus the obje+r*zury, 8doplhoyg37qz (v nu9alo*m4;ba 1 ct'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 fc)kkhy-t 0; fsorce. The graph in Fig. 6-1 shk;fsty0 -)kchows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of dw lb,4wnp1( tek-jg:the force. The graph in Fig. 6-1 shows the force versus the object's pjentwb p1l d:w 4,(k-gosition. Find the work done 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 gah:wwpz5r)mf ;q1 h.- d 6acfthe direction of the force. The graph in Fig. 6-1 shows the force versus the object's pomra6d.pw1) ;qhg c f-fah5:wz sition. 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 ikakaed* 9tt 5n*40 phzp vy0.ds applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic*td0tyhv.*z9nked 0 5pa ak4p 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 1/ijhu x9m9fj x/ot7dN is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speeijxxdj9mt91u o7 f h//d 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*1,qa /( ary(-i +p eaupiys u4mycs2s/s. How much work is required to stop the m+ui/y2 (y(a- * epqr apu1c,4ssamysiass?

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 25bvjd h*6k 7h:z m/s, what distance is required to stop a car moving at 50 mv hkb hd67:z*j/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. Idr(: v/h8uzg it is cocked by exerting a force of 20 N z/di(uh8g: rvover a distance of 5.0 cm. 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 component of 80 N and a vertical co /0r qdg),k0nxcu q grysl;-v+mponent of 60 N. The force is ap,yu+x);-g dvk0cg q rr/0 lnqsplied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's 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 in (*bhscbsj1 e4 /owxq*to a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a des qbhsj bx*4*ewo c/1(pth 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 z-c7r :1ot(dfkpa7 jxc 1 z;ho7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentidz x1jcoz;rc1:t h7fo(7pk -aal 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 jz4ctzm-.zf 1is 4.0 m long and rises 2.0 m m.j-z1 ft4zzc. If the plane is frictionless, 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, cause/m 1 wx 4,glhq. zgqk -uu,:vu2vnc*t8xckb-r s the spring to stretch 2.0 cm. What is the sprin 2vrx,--t c . 8,u1hgcqlvukunmwb k/xg4*qz:g 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 constan32dlqyqts5 ;wuog 0,/dut9tx t of 60 N/m. How much potential energy does it store, when stretcqdxs,uwu3;5t /2 9 tgloq0 tdyhed 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 uncompressed springo56xmgi05 l q-/iajbk with a s xqi5ao5m/i k6l -bg0jpring 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 constant):9/rqp* n xtip l8kbu 40 N/m from x = 0.2 *xip/rb89: tk) pnulq0 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 3.0zu4p 9*sbgglhn (sq48 * t/lec cm. How much work is(l8ubng es4/h4g zsltp*c9q* required to compress 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 slopepmg8 ra.lor06)h*c f j. What is the speed of the slier on reaching the bottom of the slope? (Neglec m).r8lac r*gop06h fjt 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 speed3tctk* jh) 1tx of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 1jkt13) ct*htx 0 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 dowcf.m *zym.m kff35qb 1n a frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. Wha. cfzkb 3f*mm .y15qfmt is 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 ukf)fi:6xml-s- xn o9the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy.onff6mx-9u:li k ) s-x 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, blk l*ox 4b;c w7azz/vv3asts 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 J. To what vertical hebv kz/ v4l7oc3x*awz;ight 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 J. 1liuv8f i 1earb ;02baAt therlai2bai8e ;b1f1 v0u highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 44ar 4rz hw4ve45 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 n4h rr4awz4 4evext 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 55 c)q//ti2:f 6tauqjza c y0el*wh emspeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). N5*eq qhwzc06if cm/:t) alt/25ae juyeglect 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. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with tfr4 hq 1g21xya 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 above the boft4q2g1rx1 yhttom 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 ag asjzz1)z v4auv+50jt the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away fr+tv hn4 w/z2zq+wh p wo4czyfz4r 3;a0om the vertical axis and released from restwoh 4w4z/ pzqy;03zv+ fzcr +nah24w t. 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 initiallh; xlh;3*xzzqcy 1z1u y uncompressed horizontal spring w ;qzly311; zxuz*ch hxith spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg c mj gy ,xv2iw+9lbfe-6mhr 1o(ar to stop for a red light. What work is done by b,(-9glj myi ov h w6mf2+1xerthe 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 0x *vp3hpeuiq(d5k wb2u 7s0rsurface is 50.0 N.i700v( hxkepr 3 up5wdq*sbu2 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 kinetic e hvz nab1k7zofu ;g(4;nergy. The friction force on it is avo7z n4;ba ( h1ug;fkz 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 horizonta1;, lqs nsprl0. l,7cylx yma-lly 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 distsn. ;lll7slax r1y,ypq -cm0,ance 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 ownwg/pv(xf ;c 4z4 cti,:*rd a 50-m high slope. If the work donc4*o;x p4dig /w,rzcvw(ntf: e 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. i,) z 4eyatj .c:bsbf6z4st2p The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. Wyz6 ci b.: tsase, 4zfpj42tb)hat was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20)wy0 v 0c1rop(i,kkx lt*t0sxe above horizontal. The coefficient of kinetic frictoxp*tkiskwv,00r(l10) xt cyion 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 groo)rrkv r67 h:/bqwo*u4 iiq ,jund with a velocity ofr,4v i ob)ik 67*q:uowrrjh/q 7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg b4ycj alh 6th8atz.0.0fhm u -goy using energy when he runs up a flight of stairs 10.0-m high, c-zma.4hj. hy 8h 60alutt0fgin
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 constantofz+y/1i4x l, dks rv3orj:w* velocity of 5.0 m/s. What power must be delivered to the oi*: s,3yzx v+1 f4kldw/rjorobject by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hesv2s q12-m2oli+2s 4lkhve wr? (1 hp = 746 W)evh ksses2l+ml4q i- o1v22w2

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. 01a hy fh(1v.r ibj/uwHow much force does her f (a0.jhf bhrvi 11u/ywoot push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 2walq : qb,(bc:5 m/s in 7.0 s. What is the average power deliveredqc:(l ,bbwaq: by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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