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

1#

What is the correct unit of work expressefk4cd.p; wg5n d 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 sysbp c g6a22vb:dtem if 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, k0st qlr, - .bs-aiw,hthe amount of work you,sqhli.s war-tb ,0k- 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 is being held ther. b;pi6 xe wmzse+4.aj /t2erde. How much work is being done in hoe4trb/zsaewdx;6 j p.im2e.+lding 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 horizonch69wfuizl3 gn yh(gc g 137n+tally forward at a constant velocity carrying a 10-N obje3(chguwncz 7 l hny+ggi193 f6ct, 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 lifted vertically 3.0 m tf 0hzksc :2u9jhen returned to its original position. If the total weight iszfj 20c9 s:ukh 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 j:,qos 2zxufe q);i2b force acting on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work don-emsoygx1kvpa;u )itc n u )d97h- 0a,e by gravity while the ball goes up w-7mugps)aau1 dce0hkt-n o xi ,9;v)yith 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) graph,kc8v7n3j ;jei representscv 38eij nk;7j

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 worsxjq mpu/ 7ghh2(qa;eok8 wf do+85y 6k done by th(q8jh qm7ao u5/y6d2h 8 pws+;gxoekfe 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 au, ,g)u-8)w cnc r8ffli jcug,n object is 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 obj bqeh(bo6x(m5z+v ,wiqfe/ c* ect'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 objev ;d;v i a100qcazy05w 5fxmject's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice*la8:vg ln 0/pxml6i n the speed of the car. Which statement is true about the truck's kinetic energy *n6n lg8l/:limapv x0compared 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 cn6ne5z6)mf)a ne;idlw ft,o j9c1 k0mar K, and car J has half the mass of car K. The kinetic energy of carc i)m6 j alf5d)n6 t,mfo90nkezn1; ew 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 original speed. W7e iib/-6w3s6,pkq vjpq7f n khat is the ratio of the i67- q/pnjbk kqs3 fv,ep6 7wifinal 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 pebblz geazf/.)gn y rh14oplh .-*fe is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the bzep *lrf. yf4/gagz h1.o)hn-rick'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 mov319ze,k ,r f:c7wv eul-gsfcwing with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels th3,f7c,w -wg :zfc9ukresv el1e 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 awv; c33wu* fzu panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the carvw; 3f 3uuw*cz 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 elliptical orbit. Neg8ml* 6 iztemoeu;k49z lecting any friction eff8ke* uz9i ztm 6;e4omlects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principlerak8 n 140z;3 yzegtno.

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 / 3l tfcf.r7:xtyk.f eto 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 h above the nz7 a8.s*rcwgground. A second object with8c7.zs* gwrna four times the mass of the 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 t9y m5fq -4jxhit to stretch 5.0 cm. If anothejhmf5tq x 9-4yr 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 energyia 1aze;y t11s)uh eur 8w.x,m of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to i9mqrn 3o+8qfyn6 1x*y2hx gtk/n n2zits potential enerrqg29o2y*mx nh +nki1x ynzqn8 f3/t6gy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hillaz+;h kq/q -93q-pmrj.i djk i.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equapt(-cu *h( n6rsi*x iy )cuaw0l speeds along a level frictionless surface. They both slide up the same frictionlesnia*ysw xpc*6th(cuu-(r )i 0s 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 9 melvv4 ;z)qqva*89 cyu df3vtv/h9h$m_{1}$ 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 dw yqp;nb)n w2/7.aol r/59tj ,cqbakenergy for conservative forcesjb cb wl .a72//qo yadrqnwk9) ,5pt;n.

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 eu1)o2zkzpqxj40/ z g top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before strizg x4kzp/ez jo0 1u)2qking 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 enerm ; b7ktva(3btgy. Do not ignore air resistance. How7vakbb ;3 mtt( much 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 mgd u1/ 3am5hopotential energy. Do not ignore air resistance. omau/d31 hmg5 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 oe,)ra p -v;viuf energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is hjn7)+* mt4l;wlex ka-om7cs

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 expresse1x(, l9qmn 5 rcdj4xewq7d1ki , to,pvkn 21qgd 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 unit o0;ysdmw2(qw zf 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 timb(b-r1 n,ltl0p qd6nm es the work in one-third the time. To do so, your powrn ,t0db l (nplb1m6-qer 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 constvsf,p4hir-8 zant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertie h88w8hxud1 ically 2.0 m and held there. If the object weighs 90 N, how81 h8euh8idwx much work 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 distance of 1.0 m, at .9x8w( u/e c rda*dhhia constant velocity of 0.50 m/s. What is the work done by the weigh/iuhcrea h8 (w*d. 9xdt 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 6r h/kuvo.*q xa distance of 50.0 m. What is the work done by the 5500 N f uqok*x/r.v6horce?

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 um* r8rqum;g.6q h/k fipward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the el6m 8*gr fqr /u.hq;mkievator?

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 pu b ;ybwh3(ykxzzz5y b)+7ptx6lled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done 3+; yxbz6byt zx5 ykzp(w) b7hon 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 v0 s6tr ne jw u2th)ehzu(8:v,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 slijz kn*v *mo7n-id0c ;xb c:se9des 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 (ym:.zu :onzkzh;u5g/p gu y,2assume no friction), with a force of 60.0 N at uo :k,gyzguzu yph:/5nz;2m. 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 grapsv j6(,x t-ab 1 wqje(*yh8wogh in Fig. 6-1 shows the force versus the objechg( ,j s(1ob8xye qaw-v*tj6wt'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 iiww.u7d ex4kxlkc b5 tg9*u3-n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's tke5ubgcd. 39k4u xwxw 7i*-lposition. 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 obje+82,bqn4 vcd mph+orgct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves v2 odc8gprq + 4hbn,+mfrom 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 4i rjbg8xpz.u-f55 ex in the direction of the force. The graph in Fig. 6-1 shows55fg.pi8r b4xjzx - eu the force versus 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 ap* brb*+uh q+-pq00 mmb0y iedtplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the caib yu b+mq00 d-e +b0*m*qhtrprt?

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 appliedj5sdyxiw+ xg88en )v(na0oq ; to move a 55-kg cart (initially at rest) across a 10 m level surface. What 8dna + yxegsx)j5 (onq;w0iv8is 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.wx z1v*0v kpqs4vcv(n;jso*jgq22qf4 oh:y( 0 m/s. How much work is required to stop the 1jqvf(qyvgz2:cvvso k w*0n q;4 4*xs(jo2 phmass?

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 movi p+v98tl)2humv5x;usy d(fcdm x :e5zng at 25 m/s, what distance is requc d v2x5 5(ufpdh s mvltzmx;y+:8)e9uired 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 prv)okh: o9ebnj +u*f0topels a 10-g dart. It is cocked by exerting a force of 20 N over a di*ehj9 koouvbft n 0)+:stance 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 vertica : 8vvnlb9pf:xl component of 60 N. The force is applied to a bop8 vfx::v bln9x 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 into a bale of hay, stj4bh +ti d6t:iriking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before s i4tbhd6:i jt+topping. 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 16a e:/rpritrheight of 7.00 m above a floor to a height of 13.0 m above the floor. Whaeitp6:a1 rr r/t is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The planet) obkocoq63* is 4.0 m long and rises 2.0 m. If the )ob *k qo3otc6plane 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, causes the spring to stretch 2.0 cm. What ijw6 +4b. xxlvvs the spring constant+xv.xv w46l bj?

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 ci 4u, 5kn tp+u2etlg04vca*w aonstant of 60 N/m. How much potential energy does it store, wp+0 t4*utv cn,g52 auelw 4kaihen 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 comp+,,ju kndm/jp ress an initially uncompressed spring with a spring constant +jjnd/kp u,m, 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 stretc aaw/v*w2x1(h s9lsin* nsd2sh a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (*d/ xnl(*9w 2 isvsnas2ws1ahAssume 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. (-mz 92x hbfk ajz,45hubvul by 3.0 cm. How much work is required to comprb5k, hjzzm(-v942ufl xau b. hess 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 ,y; o ,joqb.s6y-w nyjgi0ze;4:jn up of a 50-m high slope. What is the speed of the slier ; j.-j6 j g:n ,o,yuy0yoeb;wqz4pisnon reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes of*ljay. zh+* ilf the top of a hill with an initial speed of 4.0 m/aly*. hji* +lzs. 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/m 7 zjx,c-7vrts2(k fx1t6 0cdxy a+ bgti)lm the bottom, it has a speed of 9.80 m/s. x,t jzm-/ 6kx)s gf+7r2xtl i1abdytmc 0v c(7What 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 the floor. When it is 0.70 mm+9 xy k)f0 2ze5an1uqow2bwn above the floor, its potential energy exactly equals its kinetic energy. How f)5qwmxuoa29wn0 1kfne yz + b2ast 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 with ln56/6tyakw7v8z6*dlp yjut a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical enezykay86p j wt5/dlvtl n766u* rgy 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 the4/ k+,la jaaie ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vert,+j/alikaa4 e ical 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 45 m above the bot1f/oagv5+aiz3l 6gnbtom 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 botton gzig6v31a+a5/o flbm 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 above the bottwbjp)ag kzpp +5)/by8om of a dip (See Fig. 6-2). Neglect fricg)z +5/b j8 pppkw)ybation, 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 afnb,/4 f epb2k point 30 m above the bottom of a dip with a speed of 25 m/s (Seekf,2nbefpb4 / 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 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 spe(1yrlom3ghl52h/ wu:b6- iqyu- duzj y*:zwb ed of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and re4fif; f,9 zzmre,exa)leased fr;z9,x4f)z,ifm reef a om rest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal springpxk . p2hy10sk with s21pk p.yxkh0 spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a redug 0t )yf4bmq)1s3 vuu light. What work is done gt0)s u bmyu1q3u)4vfby the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horiz8oj( uvl6p .z9fr/q s z;f):bytg2wpnontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance tlyrqsn)p( fbj 8.z;p2 u6:go w9vf /zwill 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 hq 3 m- (kgljyt,fzu-,jas 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it mugjtfj ,k(3yzq,- l-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- )jf m sq9m)4sv817/vgclekp gnf i*t1kg mass on a level surface. The coefficient of kinetic friction be7mqsgv8 gf4)n et*1l vifk)9j1 c/smptween the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts j9f4yv,z :sh wfrom rest from the top of a 50-m high slope. If the work done by frictionh4 :j,s9wfvzy 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 4.0x5r1i0c7x- 8kucy *k2pe in ge 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 5iuc y1crx ex20ki8*-e npgk7of 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 20e above3co8q-4 7. ys-8b (po dz3bupsvd m;bvgqk sx6 horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. x.dvz3 -b d;gb pqksyvqucs pm783-6os4 8(bo 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 stry)egs-;lzeyf .-z+xj ghpe1 iw n. +n2ikes the ground with a velocity of 7.00 m/s. What averagn lx) -wgzhng+i1 ypsj 2eyf +.zee-.;e force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of staah6 4f)ario- oirs 10.0-m hi6- 4 oiaoarhf)gh, 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. - agy9ghr3+kj)eg4n1ue :tqm0 m/s. What power eq3tmeg)uha +n:-g19kyr g 4jmust be 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 energy are used by a 1.0 hp motor that runs for 1.k5ltey1r2dx nfs7,a6 2y 4urs s45mwa 0 hr? (1 hp = 746 Wsx msw74aerdua2,kn 54lys5 2r1 f6yt)

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)c 0am8 42-tarogvvbxx n (z*q riding. How much force does her foot push with when she is traveling a4xab v*gr ca 2vznt(mx)q 8o-0t 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 accelerate /pi+y+2wfl ;nrmq u6ys from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 h/ ;ry6 2++uiw qplnfmyp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

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

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