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

1#

What is the correct unit of work expressed in SIny)wqnii)0 8c 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 thew k,9br5ug b cn/i1 (f57pxhdsre 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 (idtrrs472q 8h9 jlnua stationary brick wall, the amount of work you i9tjrln h72rsdu48q( 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 7 jh:g. rn12cae3bue dthere. How much work is b:rdhgjb7c nua.e 132e eing 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 constaz m1ooe4n+z g/0+gcpqz:u0bwnt velocity carrying a 10-N object, the amount of work you dq gn/ p ozecuoz0+z+:140gw bmo 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 verkka-/jt (u. 0se bu/urtically 3.0 m then returned to its original position. If th(s/ujk a /0k.b-ru eute total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on th;yaq/d 7 h:oroe 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.k:jodz -cthyt n6f /9; Compare the sign of the work done by gravity while the bazt:dh f9 yc6-kt; n/ojll goes up 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) grayjxkyvy08 z5ez 6928xkimmbbl lg: (-ph, representsx6bk:yvx9yb z mj2 e80k8g5lliy -m(z

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work done by ykm ng2o9y*k(8qqs5zg,0 wu b the force Fygqq0yus95n(gw8mkz* o2k, b ?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then th *n-vbx8 )(vgpz*j unce 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 kinetic en9wt dmhftk-(azx0r2 7xp x .5vergy

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 ete+o44/ 4jd1mop jdl dnergy

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 movi bu-spl5ptox2xz//1gb)3 ivgjx + tjv. a5a.s ng at twice the speed of the car. Which statement is true about the truck's ki 5j)+/t. ij1bgo/35.s2vxvu agazp -xs tlbpxnetic 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 mcz 3jsk1tjp0kcsfu( c93(xi 8ass of car K. The kinetic energy of 9jss3 cc(kz8u3j1fp (0kcixtcar 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 box */fbm uhupvp-c; l6r1b .pe5-. kahyunces back with half of its original speed. What is the ratio of the final kin6uyahbcf/ h.-pk1e *;-p m.bp rux vl5etic 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 of 5hvy8er d))-e h m/s. If both objects have the same kinetic energy, what is the ratihry) e-) hevd8o 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 mz. b /0 zpij.sxa9yhr:ass is moving with speed 4.0 m/s. Both objects encounter the same c r0a:z/sh9.z.j bxipy onstant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain ry(y 7qx7w,d jdistance on a straight, level road. If you 7d(yqrwy, x7jhad been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an ellipt3*;xr;)p fe zfyqk v:jical orbit. Neglecting any friction effects, what happens to r;):qj kzyv f;3p*fexthe 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 pr vjnjtv og; (.sfht 5q3;9uo3minciple.

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 negativuff ;ty lej(b/l-,r:o6,hfqmrp9e 2 ce 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 ground. A second objp l)/ep0 pt(iwx.e jv5hp x3r9ect with four times the mass of the first if released from the same height. The potential energy of thepxwerp 9t l) (ipp3x5hjve /.0 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,v agdx6, +zy6f0s;.sml(dx*ojq ujk 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 w+gs6dz.aj uqyms ,ox(6l;*0 kx jf,vdill be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systeml5wmc7jhwt- l)8a*kfh g 2t6j

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 .vqun;f:je r2l2f2s yo*ifk+ a tree. Compare its kinetic energy K, to its potential energy k j222 .q ;vysfuif lr*efno:+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 drivinhng d883 fk b,xo:qsg.g up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equajxw s 7qhhi+ (zi6d/y8l speeds along a level frictionl hhzy8 i+(/sxwq ij6d7ess surface. 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 q +u4ny+qadvum1p. .n$m_{1}$ 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 con e7v,zn4;9dj f,7abfv+chx xmservation of mechanical energy for conservative forceshaj+49 e,cd z vxf7f ,7vxnm;b.

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 theq6yts 4kv5ts m36 t2ae air (air friction is present)a635kvt2qsse m 4tyt6 , to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J op9e 92ph raz1cg82mezj3v-qvf kinetic energy. Do not ignore air resistance. How much gravitatizp3192 g hea98j2 qm-vcvr epzonal 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 ann(ib1 ,lozg2 md loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball gainm nlio(gz ,21b?

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 dd,4y8tcvwvkz j)l n ;-mt 7f,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 is 6g5rl vw55 kcdcyzws; q6jt :/a3jwv2

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI units? o7kuwki7ma5crv6cjc (u/zz27 .5xfa

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 ay(0uxt*vijpq1nf;;7 3d7vbyqiimw:z) j 3b k 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, you did 3 times the work in one-third the time. To do soh:hbra 7 8x(lq, you a7bxl8(hhqr: r power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant accele0s5e mk+l46k:l:kd )wuhj hqnration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held thea6 e*wyr72(/jtd,2ihqa 8wgw 9xwwdqre. If the object weighs 90 N, how much work waw6tewrydwq/,aa 72gw9* jqxh8 wi2 (d s 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 physic(opihq vvo0vsi y9 2 l, s3eit0+hx6k-s book up in the air a distance of 1.0 m, at a constant velocityov0+svs-eit,k9hxiq6p oh2vily 0 3( of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upwrger s/.) opw0ard with a constant force of 5500 N for a distance of 5.oeg0 rws p)/r0.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with ukyv)vi 9 j:(ea constant force of 5500 N for a distance of 50.0 m.v (ve u)9:kiyj What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upwarphv(*rienug rwzi6d, *o-) 0md with a constant force of 5500 N for a distance of 50.0 m. What is the net work dop0idw rez*rm v 6) *-gui(hn,one 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 al7y v7j:0l a0amfo,x /(b)msizsk3. kmwsd ) fiong 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 a ramp-dye,m .j3xm t, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume (tyntaz43u6r n6oo2z no friction),2y 36ztu(o t4nnza r6o with 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 :,uieq yh4j*pgraph in Fig. 6-1 s uijp ye4*,h:qhows 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 Fig. 6-1 sjo hdg4wc+ed7j 8x9z5i+(xiyhow9 (ej ddoz ix+i4j8xyw75cgh +s 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 thet,kx )ml h1 7s6krvdt2 force. The graph in Fig. 6-1 shows the force versus the object's position.vrx hdk6t,t)7smlk 12 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 theh ,pakzm;i,wmh 173bj 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 movep h73,w imzh;b 1am,jks from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move b2(c;ivzi7n0 r;ktzu b(,rqka 55-kg cart (initially at rest) across a 10 m level surface. What is the final kcb7 kqr;b,zznk v2( ir; uti0(inetic 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 oa/c8 2g +xuc1v*ao jzn o5*ja03fezjN is applied to move a 55-kg cart (initially at rest) across a 10 m levelznjagafzjv 3 5/cooa1o2 c 0+u*j8x e* surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5 xy7 9fhx/ojb06 qk1td.0 m/s. How much work is required to stop the masbo 670kx9htd/yqfjx1s?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance .8nrawz 1il9ajwuyc2b-v.( co6do9 t is required to sto y2dw.i(w alo9b rjtua9c8 z-v1c.n6op 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 propel 8g7gc ltvy+jj.9 gak4s a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With.a+vyt l9gjgc8 jk 74g 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 horizontagf96gown3k0 vqv 4, qu7af1f.q.n xtt l component of 80 N and a vertical component of 60 N. The force is applied to a box which rests.961 g7 twqknaq ufo3.g,f 0qtvxfvn4 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 iuo 4+xb r6wt u)l5u-qls shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. w-llqb t+6 r5uuxo4 u)It penetrates a depth 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 7.00 m above a floor to a height o aub2 ,2dix p)skcr/b 9gt6j.t(8 sbdmf 13.0 m above the floor. What is the change in gravitational poten,gutdcb .jt 69bxp/s(2bs)8 kdr2mi atial 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 i 1m3jx7zeetzpu d:n.rpj ;t*wo, u +tcs,8h.up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the planm8 :r.x.7;szcu,3je njteipp h +1t zutwo,d*e 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 oy.7 7 jlejsu:lnto a spring, causes the spring to stretch 2.0 cm. What is the sprsj77e . ujyl:ling 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 l-g92 biiam 6gpk(qepji)9/ s constant of 60 N/m. How much potential energy does it store, j-ebmk(i/ q2pa9g9gpili) 6swhen 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 compressvt b-+x t30w; wf,c pwb/c9ygt an initially uncompressed spring with a sprb+fg b3p;w, 9xyctv wwtct- /0ing 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 stret;sr v rxra2ad0e .*a5dch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume a; sra2*evar d5x.0d rthe 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 initiallqp(c0n*x,gced g.2 x/t 9kuhqs kr0-my compressed by 3.0 cm. How much work isu rxk2t(d qg,/0xhgns- c*mk09qe. pc 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 fr q cwq-5i6m 6 uqif2nd/w mrb,f48th/aom the top of a 50-m high slope. What is the spee t- ic 4,wfunqmhawri2q5d6/q8 /6bmfd of the slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, wte, qr6c 3jb;/q7kh8eln 47 6gkw 0yxvscoc4pushes 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 elevao6elxr /tk sj4n,0; b yg 87cekqqvw647c3cwhtion?

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 frictis7ca jnw /av7 fe l,q.+o29mqionless inclined plane. At the bottom, it has a speed of 9.80 m/s. Wha/ mjif en 7sq+29aoc,al.w7vq t 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 m above the floor, its po ;)i*lixxfb 45i u;oc6mcp lb7tential energy exactly equals its kineibu*c) pi b6l; i5m74x;xlocftic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from groun)vu l tmkmllhm8;p14( d level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertkmlmphtm4 (v)l;u1 8lical 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 levlxa7 t) afu u769xwo3aves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relatu3t)v7a o7 luw9f6xax ive 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 bottom of a d7 vu :b 0v;p4fjfnmpv+ip (See Fig. 6-2). Neglect friction, what will be the spvbmv0j4u7 + fv p;:nfpeed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the 7b0y.6dv;s;n kv3dzuoa pu1 0mr4re j /ab,wxbottom 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 me;7 40us3j d6vru1b;yam kbdoprn, zav x0w ./ 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 startd f6d ma8/w:bzp.vnhfe.v/ 1ts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Nvd .8meah.pdw 6bt1z :nf/f/veglect 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 speed of the ball at the bottom c 5,h3reeer)c3 e5 rvaof 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 aw uckdj/- rxs83ev5sy ck:7f( way from the vertical axis and released from rest. What will be its speed at the bottom ofse8c-:dk7/j f v3 ysurx( kcw5 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 initialu1-kulq **,pbf; assply uncompressed horizontal spring with spriluk**b1pp-s, f a;qu sng 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 h *yw 7:i(jph1kftf. p,b7 fhbxer 2000 kg car to stop for a red light. What work is done by the friction force against t .pfyf7tix*wh,bjbfk7( p h1:he 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 objectjd )il ujyv(83 and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it sl lj3idj8 y(vu)ide 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 qtq2xd.jvi + ,on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 x+jtq,i2dv.q 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 ;esckw 2dl 3)*q3 knxgwt;/mna 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic enw/;) el* d3wn;ksnkmcqt3g x2 ergy?

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 lpks- 5g2ono1j:y 9qhq 6egtxh7(z *w from the top of a 50-m high slope. If the work dt6kx*5zqgeh-n y1hp(jo:7 w 9o sl2qg one 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 pl 1 :;xtmplnu6nane. 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. 1 mnu;pn xtl:6 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 -6ad 6y k1-qfuptnk0xof a plane inclined at 20e above n-yk t60 p6kd-quxaf 1horizontal. 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 st0tq4mq k4zyn 4rikes the ground with a velocity of 7.00 m/s. What t0qqmk44 zy 4naverage 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 flighceuh jl:bv+.3ql,a;d w3o)gk n +g1 iot of stairs 10.0-lh3+jv ,;+glqu:a) g.cbw n 1okdeio3m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object witj/-h ;zfu-d uuii 6o (z:nz.nud8 8vmoh a constant velocity of 5.0 m/s. What power must be delivered f. mh; oud(oiu i6 nzzjz/88n--du:uv 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 1.0,pmc yg; j26bo hr? (1 hp = 746 Wp gbo;2j6cym, )

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 w3ejslje ;0gu0hile riding. How much force does her 3 sj0;ejlg0 uefoot 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 25 m/s in 7.0 s. What is tkhw+ag)u*5 sds: y erv2r4xq/he average power delivered by thers*2ky:q+h) wxru/agv sd5e4 engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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