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

1#

What is the correct unit of work expressed i vl6hu- njgda. jx-szeh .28*vn SI units?

A. $kg m/s^2$

B. $kg m^{2}/s$

C. $kg m^{2}/s^2$

D. $kg^2 m/s^2$

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if ther ao:p;4z- 5fdf:drax xe 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( ep6di 2*mo j43u wwc1yj/gv c(hbdo1 stationary brick wall, the amount of work yo/u w1j (b23cwj4io1 6*dh(gvmcd pyoe u do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being hy+ fi0.wles/ aeld there. How much work is being donfw +yl0.e/sa ie 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 ar8b-tt -/(0ftpfsl q jt a constant velocity carrying a 10-N object, thtfp8rf(-lsq- tbtj 0/e 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 ve842a:di.nl edevt j 2mrtically 3.0 m then returned to its original position. If the total weight is 30 N, how much wo 2e4jeadn.8l:vimt d2rk 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 wor)y cm6bjq :w l5xgdm);k 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 so: s .*jzv)o5bbp)6 ez (f -lmapng3csign of the work done by gravity while the ball goes up with the sign of the )con)pmflbz5e zsg:.6 j(* 3 osvab p-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 pm5 r)iam;n*t yosition (F vs. x) graph, representsa*m5) i; rmtyn

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), whatbkjmxj p )y8 d/p)s/e( represents the work done by the forp/e8/x )yjpjsmd)bk( ce 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 obzli lw/q07 vx4ject 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 negatkt; i--zsgwr x k10xbh;u 8f5qive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is)i)2vhk 5*hxzi4 stsz zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the spt2u mg8wim6 sz+ ran02 ngyr)1 0ffb-8mr8fvqeed of the car. Which statement is true about0v)i 1 6+g0 2gffmfb rrr8-nums8 anzqm82wyt the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of car K. Theosp8btn0hr83y8t ,u ez ;al2a kinetic energy of ca,2b lo eps8hu80 3 a8;ratyzntr 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 bounce.kr9t+u9v g)k0h tj0 ngdrjc c-5g6 zys back with half of its original speed. What is the ratio of the final ki6r t)h 59tku.dgy0gjk g9 jv c-cz0rn+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 swaww9fi/lchbpi/re*s: f6 ;b r+c3 q)peed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what isl ;+fwer: 3 9wcsc/ ria6fb/pwhqb)i* the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving .j - kx+hztkkjz55g1xx1w3 a uwith speed 4.0 m/s. Both obj.5wx3zk 1+5-gzhj1 ux k ajxtkects encounter the same constant 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 9. mtd 4q+qr k3u.2opvzog:ov distance on a straight, level road. If you had beeq ov4qudo+g9rvtp kz32m o.:.n 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 elliptical oremhibnjdyma6fc.t(r40 *6*kr *j3g ubit. Neglecting any30jfru4* k*t emn6(ij*ab6 gd mhr. cy friction effects, 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 pz3q q-yntnjbn a i5s v9um:/,.i83u ivrinciple.

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 potent.dr z7gi ns1j4ial 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 heightj3/ o zo4le9spmdvb 7-fr1a0; otchc ) h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy off at;0c m9l1rz 4v3do/-j7s hoecpbo ) the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 bxdljg77k5sf y) )3dt cm. If another 0.200-kg mass is added to the spring, the potential energy of the sprifs7kd t 3 gbxyld)j75)ng 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 elx,8cv orsx5oeojl ; (18+cyjnergy 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 kle u+jpk*2tn8o 5 r5kenergy K, to its potential energtk5j*l+ 5ku 8o2erknpy 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 hillqd dd,btjgr om01 n3ns6lz0 -*.

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 arnnw;ib;3 wg/ ppk(i4 nd a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionlww/(ninr3gb p4 k;pi;ess 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 .sbf brv 5l96y$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for cotlf28m fjj) y;uz1nv8nservative forces)m8y f ljfjt;12zvu8n .

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 fri//ej )ot.*/jlo df.;zl fz -x dlimx;mction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top ofzmt*l/ l;)j fx;me/ idlofd..zj /xo - 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 dista2gbh(4dk 5itg 1 eg.vbnce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball losde gtb52g(14h .bigkve?

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 ml,.65y/wvf b km+t vngravitational potential energy. Do not6l m5m.wvbf t ,+vnyk/ ignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of e68rj x -;mohoenergy.

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 is2 :0cj+df2p(g i2yngvod el; l

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 ox:tib-* akxzj;z+d irvi04 b; f power expressed in SI units?

A. $kg m/s^2$

B. $kg m^{2}/s^2$

C. $kg m^{2}/s^3$

D. $kg^2 m/s^2$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit0 dc as fq:zbsa,+f5oj6by7a* 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 dofi8qqs.p,e,*w+pex d so,,p,ds q8f+ x*eie p.qw your power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine mucl mln, ( 6df:*f/dqqtst

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weighs 90 N,qsevcxn9qp w0;. rp61 how much work was done in liftw 6e;90qsqrv. pn1xpcing 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 distanw9r*vmbch9zo g()w.f7m wdp + ce of 1.0 m, at a constant velocity of 0.50 m/s. Whg( +w)cfwm9.dz r79obm pv* 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 upward with a constant forczmj ij3i0*bd 9e of 5500 N for a distance of 50.0 m. What is the work d zi ijb*m93jd0one by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a disn yf:blr/ 30orl(9siztance of 50.0 m. What is the work done by the weight of the eoyflzl/9r( nisr : 3b0levator?

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 constanp*lau6l: : chfsykmye,43 ) sst force of 5500 N for a distance of 50.0 m. What is the net work dl) yufms43:se ha l*syp ,6ck: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 slo 6 2ib9c.4zfg*rqsx25 xcbm up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down18vkup5e,9h:0g mpid7h ,fk0pe afmk 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 u ey02oz*qe0u Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an0u * qzeuye20o 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 thete7f7 aiiga f-0l1w:z9vhm rd4+f b,r direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work f7tg zr4h,1 rl:i9wemf- f7bvd0+aia 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. )oumxx.vdm ym)0a; q, 6-1 shows the force versus the object's position. Find the work done whe;d,)muamx.x)y qom v 0n 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. 65orx ttsrga(- kn6yp 5l/ 7mr4-1 shows the force versus the object's position. Find the yrstnmgkl6 x5t (p5or7/-4a rwork 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 the direction of the force. The grap dzs0 l161+vre(mfeao h in Fig. 6-1 shows the force versus the object's l0emsrd( 1f e+v1zoa6position. 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 applied to move a 55-kg cart (initx0l , :c h3b01gmvn pktl*ltn)ially at rest) across a 10 m level surface. What is the fingt 31kvpx,0:l 0n)mln tb lh*cal kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to mosqdc.) 5e- f-fjylrns.n0z kd rnt()*ve a 55-kg cart (initially at rest) across a 10 m level surface. What isqnncjfs-z5d0nrd ( *le)kt.).frs y - 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 witvtr-5tthx3mvw y x) +/i9 x5uph a speed of 5.0 m/s. How much work is required to stop th 9/xwptx) h5i ttv3xu-yr m+v5e 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 initiall 2hf ,ovv+2 1chi5lvfhs (xm4hy moving at 25 m/s, what distance is required v4 fhvf 5cl+(2ovhhx1is, mh2 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 propels a 10-g dart. It is cocked by exerting a force oderj7 i2jdp9a 27m9w p92kgr df 20 N over a distance of 5.0 cm. With what speed will the dart leave t29ji7wdr pe2 a7gdd rkm2 p9j9he 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 v i4c2x :wo22d1ctjv6kbbezu- ertical component of 60 N. The force is applied to a box which rests on a level fricdx2 ct 6kb42bvw-1:2ec zo uijtionless 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, striki *x. fm7pih6mang the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the ari*6 fh m7.apmxrow?

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 7.0l0 sk9+3b-b(bbd owf u0 m above a floor to a height of 13.0 m above the floor. What is the change uksb3b9+ dfb w(bo0l-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 gii p -nm,fy1*plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by thfi -,ypnm1 gi*e 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. Whato4u mzrl ch*yf0:g 50rcj q daip.w0l smz4+.: is th 5iq0fuwml0c 4 r:c.:msj h*+0drypz4lga.zo e spring constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constz3 e1j8(;yha ib5b (ppggmq+gant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?( a38p(gbjbeh5 +p;g z1qgiym

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 initia q)3bn;x(b jvs/xb-*in l /ficlly uncompressed spring with a spring constant of /sn bbf(xx v; jl) -b3*cq/iin25 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 xg3*i3qogff5:zt5p ih a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Ass535zq g p*f :toifgix3ume 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 cons6rfq3tsib5un bx0x:xq u7v)5 tant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 cm?u7s0xbq b6:n3vx )fixr tq55u

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope.dl3 f1ud9a/wyj ci a02 What is the speed of the skier on reaching the bottom 3ld9ciwf uj1ya/0a2dof 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, pushes offz- jp; 7e-ze a2ezfgs2 the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be movin -e2zajzep-g2;fsez7 g 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 ink()xvx n iri05gta6 )eclined plane. At the bottom, it has a speed of 9.80 m/s.ke 0rxx)( 6)ig5vntai What 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 abovps 6 s4v5lexi9e the floor, its potential sp45v6sixl9e energy exactly equals 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 straight up fro,w2s gswje2*m m ground level with a kinetic energy of 40 J. At the exact top,2j g2 ws*swme of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the gkb,z kdf ;bg78w7d b41 8gyksiround with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 121bwz gds47dky k,i fb;kg b8780 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a pja6 6n 6chxz0t m4(buooint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed ocju6a(6n0tz4 h obm6x f 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 ab ke8/hjq hwd1jf0oc uesq-t-y x+r.0+ove the bottom of a dip (Seex k jr-/euhqqhfwo e0.s0dy-8+ +t1jc Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a speeqvt.- 4(jo2fvaywjp lx 0ptqz+8d:y5 d of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whicdvy4ylv8t f z5-x w:0a+qjpptjo. (2 qh 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 bal:wmy8 lvi3 8xsc-p(oxl 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 2-kg pendulum of length 50 cm is-wj0/bjyg;mltk4 c o dtq.o. ; pulled 0.30 m away from the vertical axis and released from rest. What will be ic -jk/;ttjy 0qow gld4;..ombts speed at the bottom of its swing?

A. 0.42 m/s

B. 1.12 m/s

C. 1.68 m/s

D. 1.40 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 horizonc3 y-,ii .jrpuof6,mztal spring with spring constmu ijyfrz, 6io .c,3p-ant 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 athfsfv *,q9g o20ypj -v 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the whee,v jq9g *y2-0svffpohls?

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 objej s0v3 u3vx uqcw18j(fp-q k:fct and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, wha0 8c33 u1kf(-xwvfq j:juqs pvt distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surf uxw,/ :bytuyr:bb9d 3ace. It has 24 J of kinetic energy. The friction force on it is a constany yux/tr:wb3bu,9 bd :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 horizo: saec 7 c .8k4)veqj3nhavn5dntally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kineti3cn:5vjchq74v a )a k.ne8desc energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high sl8yo1)tpb,hus ai2 fdp 76mdv ,;dm 6xlope. If the work don pu ft,d12l ,6;8 d6voip yd)hmabxsm7e by friction is $-6.0 \times 10^{3} \; J$, 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 is 4.0 m long anj()f*ocqk3 1x (xdjjtd rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction f(*xx31cfo j() qtdkjj orce 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 p9iuz.ijo jo::g)q)fplane inclined at 20e above horizontal. The coefficient of kineti io9 joizu:.:gfjp) q)c 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 mzrkf;i, )n6ca , and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it if)ncar;z 6k ,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 h3e7 jbu r mlf*7-/nsiue runs up a flight of stairs 10.0-m high, iirmnbu*/7- l 3usejf7 n
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 objppqj9 b070/ vw2giu qj65-yu0kipnns ect with a constant velocity of 5.0 m/s. What power must j kw0js-7u / 0ippuq9nnvqiy2gbp560be 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 byh01oc:.0zj kelx +0zl ty 6oia a 1.0 hp motor that runs for 1.0 hr? (1 hp = 7466zi c1k+ll0t0a zej0 .:oxhoy 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 theua;t lpn.-9h (j swpj: rate of 500 W while riding. How much force does her foot push with when she.p;j:a w9jn-t(lsp hu 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 the .our90bi6vpzs,ffx;lywyr 55sg/( z average power delivered by thspw buzv,f/9 r5yf0s; r 5zi(gxoy.l6e engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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