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

1#

What is the correct unit of work express7vr*3eeu rv5:mg fq3yed 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 so6th( 4g -bqpsystem 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 as3h .4ij3su klj hard against a stationary brick wall, the amount of work you dij 4s. 3ujk3hlo

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 liftktz zn v,wgvs;r0 xm5y( uiuqy2u,;m.i1fo6 5ed 2.0 m vertically and is being held there. How much work is being done in holding the box in thi(y t usz wvn.rgo 510y x,m5 2ik;fqmuvz,u6i;s 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 cons:xn5v 9).a-ddwrj rsy tant velocity carrying a 10-N object, the amount of work :wd) sr -.y vard9nj5xyou 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 verti1z (atw*v- tcwpgv m;/c6sa;2pa e+vically 3.0 m then returned to its original position. If the total weight is 30m 1*/vact2cw;+t pa(v;i ew-ps v6 gza 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 objep611mdt .jdzf uv5q p3ct 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 done 0tgv w)3lin x(.8nam -lyb b9oqpx6k)by gravity while the ball goes up with the lo3n)q( )p6bx 9-nyabx 80tlvwmi g.k 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 ;rm +t/flnn2:g;oxcc:3l ghyhd8a8 mvs. x) graph, represents dhlctg nr83n mg/ylmx2::;+ fhaco;8

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), whatei-pfk+xpt7hhw+* b -bid2 h. represents the work done by thewhfih27* bpxhetd+ +- b-pik. 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,u zic-.zr+yua/+2 t tf 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 obje jl m9/ dbj;amqk;.j;)b8l ;i cgqkbt0ct'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 edjd2vye0x( +-6 fnnkv nergy

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 to :pz7ninb(m .wice the speed of the car. Which statement is true about the truck's kinetic energy compared t( iznp:ob.7 nmo 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 t 6n,b /zg(kl 8*jesnh:h mcdt.he mass of car K. The kinetic energy okc.mj:bh ,/*se( hzgtlndn68 f car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half ,0f-e1qd ic(6g nkr8rfpe+ ;mi3snizof its original speed. What is the ratio of the final kiidefz6+- r8;em1,ns p3in(iqc fg 0rk netic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed ct(e - *naxj u viet0uari( isj9),9e9of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to ,*i9( u9ejte-sua9 i ci) erta x(v0njthe 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 movek gks 0jgp5ax3131xning with speed 4.0 m/s. Both objects encounter the same constant bra3n53kga0x1esg 1 k xjpking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skidz7vg3 db7ib6 (d 2lfsw a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the sav6bi s d lbgzw7f372(dme 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 qeshx0y /gb*6orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic e/gs xeb0y*6h qnergy?

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 fxx j2r.izosl1i/1t- ag 8 jhd7tf-6 j o2rei6principle.

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 potentialk u y:6i3ca 9/q-fdzpy 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 sy2* , r8gg d1n,0vbqq f(mimk jkyv-.from rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object comparbvsgq,*v,i qkmykg( 02 nm.ry df-81jed 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 attachl- utg-w oa3*ied to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring wwtuo g li3--a*ill 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 enepmzi9-9)*2qzc 1k cd(dobbi4kqf i 8i rgy 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. o1+u o6-krbci4 zy zj,u -:v3 ob6pegyCompare its kinetic energy K, to its potential energzoyck-+ v-g3or,y6uj: 6bzbei p4u1 oy 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 h+t-ahzsrw4m( ill.

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 2otfxh9 7kkq,ry heavy object are sliding with equal speeds along a level frictionless surf9t72xf qkko, hace. They both 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 d62.l fy9 ye9tok uaz*$m_{1}$ 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 fo*hln;iy bwzs0;dr+m j3+ao1 z r conservative forces.+dy0h r1b o ilms+3n *j;wa;zz

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air fjsb7 gyy44a lnwf9++nj+b22 fgnai2 friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potenti4f+ynn 9yjj fa7 a2gl wn+gbb s+f2i24al 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 dista,y4e b2*smi csnce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential en e,mycs sib*24ergy 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 ap9k, xt48k*ibewzj4 oi5, p/ivt0os dnd loses 30 J of gravitational potential energy. Do not ignore air respxbi,tkeooz 8ps4*0j iid5w9v,t/ 4 kistance. 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 conservatio70g16 ho jcyu: fgfp+*q-npl pn of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t isnddgw8ya5l,.3h : nd d

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 expia ii88ld(mri2.4 x cdressed 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 ivp3zmsu ;t(1kw f;sf )s not a unit 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, yok (jxzxox7pw( y :wi2+u did 3 times the work in one-third the time. To do so, your power o wxz7jwx(p+ :io2(kyxutput 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 ca8it1pak 0tvb1m.s .2djz5 hz yr at a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted v5q .z/ puln 8hyhx+(xyelh+2gertically 2.0 m and held there. If the object weighs 90 N, howue 8+2(lh5 .xqh/+h xngpyylz 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 distani;, etcn+.l z)p0rglg ce of 1.0 m, at a constant velocity of 0.50 m/s. What is the work d)e ,trzlncgg l;.0+ pione by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for rx;1.j a m+pld, e-awra distance of 50.0 m. What is the work done by the a,x;jmw+-1.pa d lerr 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 x1palge8r2ty:n q; 5spulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by th 5gse;yl pn 1t:8arqx2e 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 a constant force ofktrp*5xfxxp a 0m*87z 5500 N for a distance of 50.0 m. What*rmfz *x8p xt0 kp57xa is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up*w9jo. 1kkmqw6( d)bgpi.7mx mwmo 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 slides 8.0 m down psrrxjckl* b-xb+mx;p0 8-x .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 lit9vfnw (c-kkz1azvxrn0bpp(-n 94 qv(tle sister Sarah in a sled on an icy surface (assume no friction), wwvn f9n4a rzp0v9vc1( k(p-(z kb-nqxith a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-k9re/a d7 .cb*9 sjgmk1 scrds*km. 9/k9b ejg7a hows the force versus 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 graph in Fix4+izedxk-5 d z43mrbg. 6-1 shows the force versus the object's position. Find the work dk dx4z5m i+3r4 eb-xdzone 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 the force. The graph in Fig. 6-1 sh/5zi -(jq x:xa a9r9uo w/.zyt(ihkl pows the force //t -.qo 9zr9 j:a(a5y xihilu(xpwkz versus the object's position. 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 (rfih4/ g.0crcpe(pq in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's positi0 q(rh f/r(pc4ce.g ipon. 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 ofe,9 5cfujir;.u4 js+v*qcio k 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kineticf.vk+9*4sj, 5ourii ;c euq jc 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 -o(j 8gxmesos(as,- z cart (initially at rest) across a 10 m level surface. What is the final speed of the co o,-sgsxem 8aj((s-z art?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is rexkr5jyv (w.vm.eb) rb9o: jq .quired to stop the:.vmr(.j5kv w) b.xqey 9jbo r 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 m24q -h;p0zyidv kgan9/s, what distance is required to stop a car moving at 50 m/s undha pyzgkq2dn4 9-; iv0er the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is yz-1 lnj h 6b- mwq)2j:5zcun0mxg2qh cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the qqml)yn0w5zu x--jn6ghm2 cbh 21 zj: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 ) x-6g vt-,pi-)zbfs sek*rqcof 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 moves 2.0 m horizontally along the floor. What is the carssr6 -kbxet vc, gp)-iq*-f)z t'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;)3kknrx0pzcn y; /tz hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopzkpt ;n0yn3)k/zr c;x ping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a flhnpaajwao4)8 3 ixrl )t/:h*dum9p.yoor to a height of 13.0 m above the fl3 w*a:hr.yidtmpp/ nlau4 o 8)x9a)hj oor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and riserqq s1rwh jjr.7st 8d nd/ q)h+ci.*c6s 2.0 m. If the plane is frictionless, hiqqrh+8 r cq7scn drs) *1 jt6/wd.h.jow 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. Wz8,y zwx 03u3wk bc:mppdd+/lhat is the spmzxu/+3b0kcw3p 8w pzdd,l: yring 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 6 (x c*xw6c*oi 4a*rcfa0 N/m. How much potential energy does it store, when stretccc *6 x*waxif 4(o*arched 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 inhst60 0+lztrbitially uncompressed spring with a spring constant of 25 N/m by 10 c0 0ztlb+h 6rtsm.

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 congmxy6wy-i87 ,reg+hkstant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unsgig8r 6,7ywyx + ek-hmtretched 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 :c d8e sz2ns3fby 3.0 cm. How much work is required to compress the spring an additionndfs:38 se2 zcal 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 fapcqc3:xl9k. rom the top of a 50-m high slope. What is the speed of the skier on reachic:cpaklq3x 9.ng the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushesm, k.qc i6:rbp off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in q6 ,rk bc.pm:ielevation?

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 bottom, ijjtm*z val.hq5 5o:1v t has a speed of 9.80 m/s. What is the vertical height 1ovtm:j5zvh* jq a5 .lof 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 fl*sxjb6kus; q6oor. When it is 0.70 m above the floor, its potential energy exactly equ6 uqs*;6ks jbxals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts st5zk-ww*dl nicg-- rv-raight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its t -w-w- lrkd c-g*v5zinotal 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 witszc1his9j3f k8 m/6 guh a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative t /98jzkfu6hicm1gss 3 o 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 pointltfc7v*5 k rvlh/2u d5 au8.fe 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of ed 2ua8 k l55uf.7t*vlhv rf/cthe 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 )g,y e scjoo/75.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect fricte ,sjooc)/y7g ion, 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 tz14xz7be s4cm:chfw6he bottom of 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 slo h:em71cwsf x c4zz46bpe, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the botton/sx kxa9m )wjl5f6c+ m 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 2-kg pendulum of lenghwks y;w 3vv3-b34ti 2;ykrrrth 50 cm is pulled 0.27 m away from the vertical axis and released from rest. What will be its speed at the bottom of its swin;kh v3wk-rsw;ytb 2r4 3iryv 3g?

A. 0.374 m/s

B. 0.997 m/s

C. 1.495 m/s

D. 1.246 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 horizl jyys 7;x6ng+ontal spring with spring constantgx;ls 6ynyj +7 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:c6jfwx6umv9yt mp) 5 n )sda-ar to stop for a red light. What work is done by the fric)txfd6n5s9m jvcwm )p :6a- uytion 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 60.08tp;.qdxm q (v-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide befmv;tpq(8x d .qore 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, lthssq/r- lhoe-svu 8e.legu)g /:w -19/lv tdevel surface. It has 24 J of kinetic energy. The friction force on it is a constanr/./heg8 sqo-l1g 9vsel-d/)thsu- e ulwvt:t 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 )efgyq jm32f; a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If;g3 me)fy2j qf the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from h + jt 1axafx:r cc,(u8wi:iq5fcc4(rthe top of a 50-m high slope. If the work done by friction is5awr ( f4 u8cx h:t:i (1+,xcfarcijcq $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane i fh b7ka4x3imjpc1 qucrt4/ 16s 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the p/a67rq p34khfucmj i1 1t4 bcxlane. What 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 20e above;8p --hhf twmqax.2eu horizon ha.8--xp2 twufmh ;qetal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikeu+ssc 3bvjgwy ,m 966ls the ground with a velocity of 7.00 jcv9 umb6sw3ysg ,6+lm/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 bo2f cw3gcsi0t1 y using energy when he runs up a flight of stairs 10.0-m high, i2ccs01t3w fg 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 jfjt )x7f3*d dmove an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the force?)d *jdxft3f7 j

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 :y1zgbw0gp i )1.0 hr? (1 hp = b)izwpgg 1y:0 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at thqgk: xrd3 ;u)u vpygsc)pg/a/w4y( n)e rate of 500 W while riding. How much force does her foot push with when sgx/g(;rnuk gq3a )puw/ 4y y)s p)dc:vhe 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 25 m/s in 7.0 s. Whatmzouz* h +snwlg7. 5)p is the average power delivered by the engine? (1 hp = 746 W5 )m+n7zpg zusolwh*. )

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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