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

1#

What is the correct unit of work expre- 3 ,vb9taa6jdqfo;d7qostv)s9 ltk4wcu8l 1ssed 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 system if there is k31 nn70epjp kw3)too no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, theu,exjxap+75 f amount of work you 7exp5j, ux+afdo

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 there. How/)c(-g vzub i7prqq *o much work is being done in hoo)- 7czqp (ugv/b*iq rlding 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 constant velocity carrying a 10-7tkw zf8o6 xu1N object, the amount of work you kz8 w7o61txu fdo is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to itnok 8m(kqj;h /s original position. If t nqkh;oj (k/m8he 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 dc/p k)fdqek/x3 ul 6jf-7o5t52hb fd oo 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. Cqo4t hxgq 5eap,oe*6) f(stt, ompare the sign of the work done by gravity while the ball goes up with the sign of the work doneo5t p)4t,,oq( eshe* xt6f gaq 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 positioc33hpr)4tm tvn (F vs. x) graph, represents4vcm ) r3ph3tt

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), wh07sfolb y 1bohvrdhc2r5389 n at represents the work done by therbs251 oh98nc oyh3l f rbd7v0 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,42ko3puth es2h yf3;ckko1 nc i -nf9 on an object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's v2r21fru1yds vf8s(b 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 kinetdd 3p4u fg2+mgy7tot: ic 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 c:9afmi ,k dz/5ccnag :ar, and is moving at twice the speed of the car. Which st95a:caf, mzgn :k ic/datement is true about 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, ana/) kv6qn nk y((4zcl6sfw cm4d car J has half the mass of car K. The kinetic energy of car J, compared to c y 6 kvcs)alc/w((fnk 64nq4mzar K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its or af,h*8c:,)gav,p j uh:huzkg iginal speed. What is the ratio of the final kinetic energy to the initial kinetic energgf)k,vah gh:8j puuc:,z *, ahy?

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 mys.9k7d9( +d70bsh2 zot veh vb nu5uwoving at a speed of 5 m/s. If both objects have the same kinetic energy, what is thw.k(9v5 +7yvsbhu dzthd2osu7 e09nbe 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 movip d4kad5;co 5 c,omj4ung with speed 4.0 m/s. Both objects encounter the same constaodck,ou 5j5 ;4dpm4 acnt 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 .6 pp,yjno ul7your car in a panic, and skid a certain distance on a straight, level road. Inl py67. juop,f you had 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 orbitpg4-u chr10.z* ucg3mc en 5ubs the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet'u4* 5pu. 03cbg -ncez1ghurmcs 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-energp psw,zb3k))k y principle.

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 pote-0lm(g5 tjr t 4sg:ki,kn.wldntial 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 s-9s jijkioilq:2(c 75 yymnejz28 :cthe ground. A second object with four time ksy(co:29 :7qimsz52i jyljnj ie-8cs the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring caus8tx mamq4b/m nt/bdj6kv )bxz8049tx es it to stretch 5.0 cm. If another 0.200-kg mass is added to thmq md8tnj txtz/mva0b46b4xk9 b)x/ 8e spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a s8prejk 7l79;at y/gyx ystem

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.e4 q /t5c8np36wj mfzu Compare its kinetic energy K, to its potential energy U.pzm t 3nf4euc5 w8q/6j

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 cardc 0 /t v2,ay6guevv9e driving 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 ar3c0b x91vtz nl/eq7xc e sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. 3x/ecqbnl zx1t vc9 70Which 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 j+6,c;frr wdp$m_{1}$ 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 conservative forqon* nth:/i;n cesq*:tn io;n/hn.

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 :2*knb4d h0gb: k:i yv7fby gwfriction is presentwyfy0k7db:bin*g: kv4 2b:h g ), 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 of kinetic energy. Do not+0nul95phezvsag s) l(a dp)3 ignore air resistance. How much gravitational pot)sh0v3a +ual(9 )gd5nzlpps e ential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potentdt d hwa.2rz*kq sm *mhvb7)hoe;;:t.ial energy. Do not ignore air resisva:..dzhqh7*e;; bdmmrw2ok) s ht* t tance. 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 em 69x+5o d;es vabj8oynergy.

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+0 chpy2ij:sak,6ub hh *; kz5frb* kj

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 poweru -0 xfxqppr** 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, whi9nvb;jdy, 8ha fhfplw6/e2f.ch is 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, you did 3 times the work in one-third8k5gh l63) 0 m,ohonhse wx7dv the time. To do so, your power outpwl h5,h6h3v8 7emkxd o0sg)nout 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,in 9swl8*i-qksdx3 :m 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:m6h+h cyn9ioqom :(s there. If the object weighs 90 N, how much work was done in6oc+y smi::(n ohmq h9 lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a con4*n)lo0 yjrof stant velocity of 0.50 m/s. What is the work done by the weigh4lj n*ro0f)yot 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 ii5pagaw 0h3: with a constant force of 5500 N for a distance of 50.0 m. What3 p:ii50wa gha 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 a constant force of 5500 N pf+ : v3b;/u(aw xpjkmwc:2nn for a distance of 50.0 m. What is the work done by the weight of the ele+a ub::xw;j w/p2(vfp 3mncnkvator?

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 :h :l(ebbsljkgjy )+.eb 8j9ka8 )af hwith a constant force of 5500 N for a distance of 50.0 m. What9.e() abjl 8sb jfk +ykbjhh::ega8l) 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. r0qr1 (t 8nr,jrm7bzt0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of frug8m6f32tlqw l:)a: kyvi(kwd it slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no f 7t.rfkde c96vriction), with a fotcfe vrd.6k9 7rce 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 directr(**xi hi6 gfa g4*wp 0bw.(vmeamno 6ion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves fgb0ragi 4(ifawhmoe*x*. *6nw mv( 6prom 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. Thee9w6( 8/(ljynkjcv x m graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objectmj (k6vl(x necy/ 9wj8 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 s -qp)kr 7/tlfkhows the force versus / r-plk7q ftk)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 in the direction of the f .9h32l h;utpvheem( aorce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thh2v.la e9mu (3;hpethe 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 2x. xcnke w9.kapplied to move a 55-kg cart (initially at rest) acre xxn9ck 2..kwoss a 10 m level surface. What is the final 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 move a 55-kg cart (irw59:h3e ieyeldo b28 nitially at rest) across a 10 m level surface. What isrbyeodih: 2e w958l3e 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 wio+o3vjv7 dg(k *b+cdrth a speed of 5.0 m/s. How much work is required to sto bk d+jrdcg7+*vo3vo (p the 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 m/s, what distance ih ( ,oic(vs.cus required to stop a car moving at 50 m/s under the same conditc.(chou i s,(vion?

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 1l0r,ea /n+w;yi wra: v0-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming tl wr+v awr, a0y:i/;nehe 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 oml15h:wsts3p oko *6y j()nog f 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 aloyont5 ol3)ssjm6(hwk* gp1:ong 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 horzf66;dngw d o5izontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acti6o;56 fwg zdndng 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 t1z. tbp/fn 7i8me sr,ff w9p.ro a height of 13.0 m above the floo .n. zsbi7ef1p9 rm,tf rwf/8pr. 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 inclinexargw s1i0ak5gos9e6)y hd9z06,dy 5bv t(hcd plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work wa)9kog xa05s cbgr(idvh0w6h yea9 ty1z5d,6 ss 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 stret4:un7z 5aytdfsb fuf8u ex)/) 8apjy8 ch 2.0 cm. What is the spring constanu:p8) azfya)e tn 85y7u/jdf 84xfus bt?

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 60 N/m. How muchj.k2vh3.uoihpottk0k fbu qf( 3v.-7 potential energy does it store, when stretched byfkub2pvuitoh.t .-k oq73hf v0k 3 (.j 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spr7hc+cs-x4 gt ee , )(sfdfgtl5ing with a spring constant ofel+tfdc, gsx7t4f gc( h)e-s5 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 stretjxw.i8e,u;nqyb 5y i 79ji) qcch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched n qj5y b8i,x)i9qi u;c.7w ejyposition 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 constaniu7 6g)d 2ue4, xm(ku ioiq-ofv3;8+ yynx brht of 15 N/m is initially compressed by 3.0 cm. How much work is required to compr ouy4mqd+,)37(uygi i;fxko8bx n h -er62uivess the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is the s1 n+x yqm,zp.**w +wmk7bv yxxpeed of the skier on reaching the bottom of the slope? (neglect fbn x,pw1 +qzxy*+vymmxk*.7w riction)

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, pusw,/d da8id+2nml/ gzp hes off the top of a hill with an initial speed of 4.0 m/s. Neglecting frict/z a+pldm2wd,ngd8i /ion, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a fricd: 7guu m )kmxeosw.0o4)wxc7tionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height ofwgxuc)ou o mm7e).k 04 ds:wx7 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 flo(cu cf-o v-y3e ;aw*gvor, its potential energy exactly equals its kinetic energy. How fast is* aucv gv c(;-f3owey- it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level with a kineti(3h w gvia7zl mez,6m-g5spzcdx(c1;c energy of 40 J. At the exact top of its trajectory, its total mechanical energy isdm( 5pz7(sevc,gwal 1zi 3g-mh cx6;z 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 t,,) .nze v7s uyeuzs xm7h5sw/he ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic . ,e)s/7evxsywz mnhu5,7us z energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at ar..i8 fv ro9xb9ic((xsx,y pf point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottxfrf(.y iv.p(xox9r i9b8s,com 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 speetteq+ whnoh 5- f)l)s3d of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?et ow3n) )qth-fl +s5h

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 poinn,e jl46(kume mi8/m nt 30 m above the 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 slope, wjm, 8nn6 ieu/4(lm kmehich 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 of its swi; 1b),rm:: vlibatp krng (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 pulled 0.17 m away hii;a2 *fsqy -rw)3wf 1a dxl*b3s-yx from the vertical axis and released from rest. What wi xifa3s3b;qyw )h 1yr2id*-w-*sfalxll be its speed at the bottom of its swing?

A. 0.229 m/s

B. 0.611 m/s

C. 0.917 m/s

D. 0.764 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 ant3,5. g*8y wfz midsaq initially uncompressed horizontal spring wsgit3ydw fq,a* 5z. 8mith spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop forr/4cqi7+m zk*du28snywr6f q a red light. What work is done by the friction f /8 ysik*+qmdcrfrn247uzqw 6 orce against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontai.o iyb tu6f v1o:dr1beut* (-l surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it t6(v-bo 1o. i:u*yefbtud1irslide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J d8d:t/cjmn. hn 8jjl; of kinetic energy. The friction force on it is a constant 0.50 N. How far willjmhdjnjd8tc 8 /: ln.; 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 a 2.0-kg mass on a level uwe.udd1z(p) 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 chang.du1u pwd() zee in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If the work dtbgp vein*e9i6i/ 8 e3one by fricti/39peinbiig6*vee 8 t on 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 4gix/kr k*tz ex6l/qb;m;3ks).0 m long and rises 2.0 m. It requires 3200 J of work s*) gxrxqkli6/;b k;tm/ez3kto get the box to the top of the plane. 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 restxkn0pt (q)*ky at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after slidi(*pt nqk0x)ykng 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 strivmnzegcwr1.y v0:+4z f( kp9okes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as oy.pzv4:9+ erkc01mvf( nwzgit falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of stairh9) f *dmekwr6rpm m4 ip(,qz9s 10.0-m him4,(mpf p )k9q 6d* eziwhr9mrgh, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constan-zn)hj/bvaus c(h y/4u n(s1zt velocity of 5.0 m/s. W4-n(z)suu( n 1chza/b/hyjsv hat power must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp 6x/vfba36nu9n g7uxt = 746 W)xn67a u/63fb tnuxvg9

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 5avm:tnzs 6tfoi(dt(7t u g :/100 W while riding. How much force does her foot push with when shei 6tn( uatf( z1:7 otgsvt:m/d 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 acceleratea m4(s7ggdo+9pgb-cu g3w 4zi,e c ke;s from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 Wg3mo( bg ci7s-9a4egc;4 zkp +degw,u)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

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