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

1#

What is the correct unit of work expressed in Sw qjc914wt6vb -kv:ksI 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 fiya;-o d -s*ja system if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationa*,wloi-z ua2s ry brick wall, the amount of work you2 -*,uiowas zl 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 liftedfy wy-)n;sjx; 2.0 m vertically and is being held there. How much work is fnswxjyy ;-;)being 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 horizontdydnvnj x7y.37f7.. nuwtk/qally forward at a constant velocity carrying a 10-N object, ttn7.7/dk3wuyyqd.j .vxnn7 f he 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 5om-neyt gr7206weauc k+o x7 lifted vertically 3.0 m then returned to its original position. If the total weight is 30 6- o7n oxm0wgeatkr yce57+2uN, 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 the ob a07:ks/iie object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign o;w7r6j8wwlb 0fc2 vq v8s1blof the work done by gravity while the ball goes up wivw0cr7vwl1 bf 6sj;bo l8 wq82th 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 curvsj-+t cjd ku0x,z-l 1je, on a Force versus position (F vs. x) graph, representslkujdtz-x scjj +,1 -0

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 5v;xbplvkota3m 1;tdq0 64 tnthe fovp;kat54 0qbl;dot 136tn v xmrce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kineg+ iq0m,e.fibalr8dts1 q n2ki k/d5 /tic 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, th8hr 1s6nr-uh 5wfe 8gythw6-gen 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 zero, t/ap*sex )la9k 7is em6hen 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 asuk0d+ ml9j 3qgvs(e)m a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic en)m0 u3dl m jg+sq(kv9eergy 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 K5w cazl9oj 7b;/m -zwi, and car J has half the mass of car K. The kinetic enemz-zil97 owc;baj5/w rgy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its original speed. Wha*hm1)r6 exz1i9wrxg ot is the ratio of the final kinetic energy to thz wr9egr1i x1*oxmh )6e 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 pebblen k;qzb/guv( ) is moving at a speed of 5 m/s. If both objects have the same kinet; g(un/kqbz)vic energy, what is 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 with speed :(k+ncp 5ru ne4.0 m/s. Both objects encounter the same constant braking force, and (nc5nk :up+r eare 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, o6pi filmt1z*:1w qvp i:c35 uand skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would 1l*i6 :1if iq:opm5z tpwcvu3the 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 orbit. Neglectin jvajws4+te3(g any frijvwea+4t (s j3ction 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 prinl;jh )ke9q *kczd()veyxf* 7ociple.

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 potential ene; 2x crly*h 8ncnpvr4fyr3-:prgy?

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 gr skm*m ykm aq v6n22a;3bab9)dound. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the9a ama;qbsk 2)kymvb nd3m2 6* 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 l+eib y:;g:3eno-wmn stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of th-i:l n:3n mo+;gw eyebe 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 eng ko5grwk 7;8yergy 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 3u0th2em7i1h4wj m ql8tv ,gb(f;xaktree. Compare its kinetic energy K, to its potential energy Ub2vikmuh 13 ( jfxqwt7a;,m l4e80tgh.

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 ofbzxm m ebm 0p75rf5-e4 a car 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 hea )*ivhn 5cg l xb157l:zzdiy+d9 vttw.vy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises titzl+ zg9hb.nl v57vc )xi1*ydd 5:wto 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 vv1hz,l/v;jnxeon 82iw*o5i $m_{1}$ 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 mechanx3 , e5 g*w3ohiejfel0cb 5me(ical energy for conservative forces.elm5j be3ge,5*i eco h30 x(wf

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 airo 8)wcl-j 1zmtxecawlvcm15 q1 6hj+9 (air friction 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 of the buildi6cjmczhq9 lamo8 1 -5+ twxlvcw1)j e1ng?

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 ignor/e6f.1o d jrmoe air resistance. How much gravitat. 6roefod1 j/mional potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitemtwlm;9 r78s p..ogbuv)qq* ational potential energy. Do not ignore air resistance. How much kinq;u)sp9.mme.w7 q*rg8vob tletic 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 conser anxp k,y ugq2p 5faei7unl3 e61q7d5qz9 x*l0vation 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 isdfrq)t4gj:86a . .: z5:vdx zvgmuxuv

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 u86 dfg)(pwnn onit of 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 unit of poweu2w2) br )l/ ;a5bj9ktlyoee lr?

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-hl/ t/og-wti4third the time. To do so, your power output must to4i/ltwh -/ ghave 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 .uu)xv ph*aw.at a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0f:;,pvk2 .vnsff3a yk m and held there. If the object weighs 90 N, how much work wpv,sv3.n;y:af2f k f kas done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a consxtm0x,9lc nst.v4z) b92 quucmgy 5s. tant velocity of 0.bc. v4g9)s 9 xutyxmq2m0.lt csu,5n z50 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 upward with a constant forcpk.agp-g,;pzeuj *2 be of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N force?zpjk.;gpu *-,b p2 age

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 55 i 6hw5t1oer)j00 N for a distance of 50.0 m. What is the work done b)he56rowt1ij y 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 upward with a constant fo/evo;7p aj*eorce of 5500 N for a distance of 50.0 m. What is the net work dooj pa7 ;/eev*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 al8* f0 3uvbgr ls(rs9*- jlb6hl 5hpugaong 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 slidezz//i2yw;m bys 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 sid6 qv4z(q6jt* tmt k nv-qv)+uster Sarah in a sled on an icy surface (assume no friction), witj+qkqv)6v *6ttm -vdqt4(u znh a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-1. -el w vs3- usjc6-pircm3.b0ovfxv2 shows the force versus the object's position. Find the work done when the object moves from 0 to 2x0.-2ovrfpc-scbj. i w3mvu6s l v3-e.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 dix ky6kh 7r-5s 6ctip;lrection 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 f6hti75;-cykx kp 6s lrrom 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 nuh,8v 7fii5ml x(xr3the force. The graph in Fig. 6-1 shows (h7xm3n5i ,fvxlur8 ithe force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of th zsrg *bn0hix155 4olae force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.z5r*l 54 bhin sgxa0o1

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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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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 s4oyon *v44rvwfd:p9ef- lt1org7 s* 200 N is applied to move a 55-kg cart (initially at rest) tr r- go7ofepv:fvos4yns9* *144 wdlacross 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 totxn)ymt +k vfg(:7p9f move a 55-kg cart (initially at rest) across a 10 m lev):n f9pvf+g7t ytkm x(el 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 s jq2jtwa6p;f /peed of 5.0 m/s. How much work is required to stop wt / fap6;2jqjthe 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 /l2qrlib.8f0g1h fry initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conr/y .2lq0 lh b8i1grffdition?

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 sn lbk;0o a1-0l rv5kc10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. W;501nskblk rav0- lcoith what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component*1+;ina(pqa l;b jlq z of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cartab(ll+ai;jn q ;p1*zq 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 hhs+c +m,oud p9jwhp 58y6b gy8orizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 ,8s+ bp wd h uo5pm8yyj6g+hc9cm 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 7.00eb)psze(ft.((bxv fj.3sc y ) m above a floor to a height of 13.0 m above the floor. What is the fes.fz .vp x3()() (b ysectbjchange 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 u op;j6g lwk a3uu;k4m*p an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictkj ;3umg4 6w* auklpo;ionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto(m:fncr77 wp i a spring, causes the spring to stretch 2.0 cm. What is the spring m7f (7p rcinw: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 charactereait.kj3 xz)o; (k9 zxized by a spring constant of 60 N/m. How much potential energy does it store, whene9.a jz;3ok x)(txikz 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 compress ae7bfsmp.5u( +s q;qfdn initially uncompressed spring with a sprqfub;f m.dsqp es(+7 5ing 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 stretch a spring of spring constant 40 N/m from x = 5f1z ftkck rv1e a88 )f/ylw8c0.20 m to 0.zly1rcv8 )cefk8 atf1wf/85k25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm.14dxag tqvu4 s8(on9r oomt 64 How much no 8st t9ma(gdxuo44or6 qv41work is 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 from the top of a 50-m highwq p1 :qi//*gvklub j) slope. What is the speed of the skier on reaching thelbi *)wkg q:qup/v /j1 bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial sh0l/mu-liqu -.f:wb k peed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatiof- h 0 luwuml.q:ki/b-n?

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 inc:,+ qewkihv8ud +c b2*;czniclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertica vbch:q +,zduic ki+2enwc;*8l 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 0oze( d25mv: wifxz5byr6r5 (j .70 m above the floor, its potential energy exactly equals its kinetic energdx 2rzmz 5vre5j5i:(( 6y ofwby. 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 1l/j76-tq 3 jtujq i9jv0 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what v9t/j qj7til-jq ju36vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a k+ s2ag )r2 ca:stuo)hyinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to i2:ahg+)yus2t ra)c s ots 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 457k3j 3ay9ll pq3bj4;b ov xvjp5(jxu; m above the bottom of a dip (See Fio3 3 bxvj;k y4 aj5p9upjlxljv3;b(q 7g. 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. 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 star q czcfiz,z5lz8/:j z/ts with a speed of 5.0 m/s at a point 45 m above the bottom of a di8z 5/qzli /zzczj ,fc:p (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?

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 ofsiz4,nh z 2za) 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, which z)i,2s4znh z ais 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 swing (poi sh- v3npny a(xfs)),jpysl;+ nt

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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 0.29 m az*+h/ l jls.h;z83k1gocyug uway from the vertical axis and released from rest. What will be its speed at the botto lgzy*s . g ucl3hj+h8k/z1o;um of its swing?

A. 0.404 m/s

B. 1.078 m/s

C. 1.618 m/s

D. 1.348 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 hoa k65nk5(dr lwrizontal spring with spring consnr6(5 kdlk5 awtant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a r2uwun r ugpf904amro p7f+ ) qb.o5ph:ed light. o0:ru fpn4 ph29ampg5b7o+q).uf wruWhat work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a h* 9f6+d .wzcocrdu5 (e :8cl8 ssa/;dcet lonforizontal surface is 50.0 N. I c8l.65s+fafnd 9w8 c:;/t dcrd oo*zcsulee(f the initial speed of the object is 25.0 m/s, what 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 surface. It has 0x2snxulzc1 )7 jv(lf24 J of kinetic energy. The frv0jc2 7u (fxz)lsl1xniction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a legycn:z+e4ruw0lla/ (yc) b p*vel 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, wha*nz+pcy0a ulye) lr ( wbgc:/4t is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top o (huz8.kx3tm +cx:)wqk;f vxs vjq;w( f a 50-m high slope. If the work don;vqjq.k;+x x3xw 8ts(w )f : (uzhmvcke 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 anvqo/ 05*yk lhau2p n pjxwkwy)8/(7wj inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the / a xh kpv*y8205noyj(7wwqu jwpk/)ltop 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 rest at the top of a plane )dq8mvbud6bt7c7o /z inclined at 20e above horizontal. The coefficient of z bbqv/6d t7cu7om8)d 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 x c kn5u(xd51 gpr6dmv puy5(zv 8,;lcheight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What averarkm(u 55d6u gcz nx dx8p;pcvlv15y,( ge 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 wv bs .v.ob)0gi s,kg9nv)8 wi+bo3tr runs up a flight of stairs 10.0-m vi 93 ,)kro sw. .gnvib0bt+wsv8bgo)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 objebuf iik/0 a,h9r n qr;l54on: (o9zkcect with a constant velocity of 5.0 m/s. What power must be delivec45 ; zn0 (f,k 9q:iioe 9b/hornlruakred 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 uo7z qmyw45gvx3yn 2n3sed by a 1.0 hp motor that runs for 1.0 hr? (1 hp = yv3 w nxn4o3g z2qy57m746 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 ateu ;p:+ds* trp the rate of 500 W while riding. How much force does her foot pu*p:pe rsdt+;u sh 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. Wha: cks qiuy;7;at is the average power delivered by the engine? (1 hp =:u ayq;7cksi ; 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

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