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

1#

What is the correct unit of wor2z ds 7eqd/q2bfg/*aik expressed 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 no motionro6gp1.c(nwtxc,: g z ?

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, the amount of 5v4/qvdi 1gn5hsr 3o dwork you dos qohg dr5/45 3idnvv1

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. H 3m-yu rbe(r6/ximr( cow much work is being done in holdi m-mx6i(rre3(c y/r bung 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 r 8pbl ssp+d qx+os0jkz+.l )/a 10-N object, lx0qz++/8sjdps+)rs.l pkob the 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 verticall+q r+/feu8j/7gea 5x ame7xvpy 3.0 m then returned to its original positi5 qx /8u ag+p/efx+rev 7eamj7on. If the total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on the objectpjw k a(u*cf779c)bbt?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravity whiywxpme(9 0atat ; * k:epxk)s-le the ball goes up with the sign of the work done by grxe0ayw)kk -;9t*:xmsa( tpe pavity 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 v 5) e :f1gj 8alw*7:o6, nsnsjaccjfihersus position (F vs. x) graph, representsoine:c8 awg ,j5l)cjfshj7a :* 6 s1fn

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 k5c)gez vrd6i qpg0-e3 d08hrjg2o 3 zu )g*fkposition (F vs. x), what represents the work done by the fokzf gz gker2* g36)qouc)ir pd jg5h3d-0e08 vrce 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 kine9l c3r0n(e6dzs p;pub 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, then the object'siyosmd 7)5x644 yvp3u2y ei ge 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 ttqi,, k1 a57u6z)wunyb(xe qz he 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, angae pn 0txl8pzz;)3y8d is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to y 0xte3n8lz ;a8pzp)g 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(tv j+cwxk/ e:y lc38t J has half the mass of car K. The kinetic energy of :(jvxt8/ c+cty3 ew lkcar 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 spec -(um 08g6n/jepv7bsxggbf 4-l .hceed. What is the ratio of the final kinetic enev4s07 j-el(6bh cg/nfbxp .g8g- eucmrgy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is m6y*s4kuc 5hy aoving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the r4a cy5k*6uyhs atio 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 wt2 u 95cqdn2uzxy8w2h+ ci2v moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to reww22 d2unv tc9 5uyhc2qi +x8zst. 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 6rwy)/k1u rgr skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the c1)r r/r gk6wyuar 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 massk3)53/rmc(jf(l34, p,f9 ki jaipriavo dan z orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kineticl knmf pi,apj5)34ra ok 3j,fa(/ i rz9(vicd3 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 princbugopkys8:(v25hk jc l*70vc(dgi- x iple.

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 2- :nv3mk:,aukq s-azd ptw2 isystem to have negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above t091vzg6p mi.4hnipzc he ground. A second object with four times the mass of the first if relea4p nc 6.vi1z0ipgh9z msed 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 attached4j)mlr/ xnsx u(+9qdz. u xo2a to the end of a spring causes it to stretch 5.0 cm. If anot4/r2 ql n) (u.ox+mjs9dxax zuher 0.200-kg mass is added to the 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 syxqogv) 2k uvup0qd 99 hn,tc84tz 8;uwstem

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 energy K, to i m v*snihts6kna/e5oki23; +qiu-db+p,;cyw ts potential enercpi tqaiun b*k+o;; 23 6hds+,kew /i mnv5s-ygy 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 c3h*n ej;bjl vp81ipru2a.x kw-ed j(- ar 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 xkrbc8j s28m/u ym,0overy heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same fr0 bj2mx8 /s ,rcm8uoykictionless 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 kq ri l.:j+3lk$m_{1}$ 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 me vz2om 4-xj3xbchanical energy for conservative forces v43zbxxmo2j- .

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 friction is pjj pu;eoj 4,0k mt96rnvu v468tg4ol z+tod1 fresent), to the ground below. How does the kinmor4fj6noplv90gt 8u44;t,o6 jz jdu+v1 tke etic 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 dik 4-rda(lob)n7 ks(u4j +fvt nstance and gains 30 J of kinetic energy. Do not ignore air resistan n74(u b+-anfsjrl)kdvko t( 4ce. How much gravitational 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 gravit pup 36vnqz2;l oh3og8ational potential energy. Do l v38nzo36qupo2gph; not 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 ofj)h6tv-6em lw energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t is) qo tdrvut:2mvk20 )z

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power ozolx x9cctyor +k- 8b48p*nvo:-: sz 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 vj4n0yi ;j ;vzpower?

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 0cghwm;a/k9ed zig.obp . 1(e work in one-third the time. To do so, your .e(0z9p kcowa. hggi ;/ mb1edpower 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 at0-9pjua65xgl 0 t n(ntx hiy;p 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 2.0 m and held there. If the object k678c*dtor yis7hwdwy3d n99 weighs 90 N, how much work was done in li*89whcki7 dy n ot9wr7y dds63fting 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/pv2) l9 kgwme up in the air a distance of 1.0 m, at a constant velocity of9p k/2 egvmwl) 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a crj-lw1f gr+kd 6i/txz :)tbm0 onstant force of 5500 N for a distance of 50.0 m. What is the/lt10ztrr-jg f )6kd mwx+ib: 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 upwajo/2zimh6a9- gx k4 rkrd with a constant force of 5500 N for a distance of 50.0 m. What is jh 6krkiom - g4x9z2a/the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a distan(n+ws/.dychwm +ka)om;) tsnce of 50.0 m. What is the net work done on the elevator?(swnt+anm)wdos.;ck y +mh/)

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 6.03 93wsrwuv4r4 wq)twb 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 fruit slides 8.0 m down a ramp, inclm62 ci j9nfh-yqrx -gk:;*geu ined 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 (asshr)xp bfxdb7h(/r s 8/uu*f/yume no friction),fu/b8hsp)yf(7/ dx r/ rx*hub with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of )t05jc w7xwm wthe force. The graph in Fig. 6-1 shw cj t75wmx)0wows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 8w9-.tzr tid o6-1 shows the force versus the object's position. Find the work done when the object .wdrt9oi z-t8moves 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 2 ctdw+. 2*af.h 5+a bk e4gutb;p(f+yt dwqnethe direction of the force. The graph in Fig. 6-1 shows the force versu b;t4e+awdt fh+qd.yk (wgufnt cp.a+e2* 52bs 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 force. The graph in Fig.a *- n oc9on*fbqg5/ p2tmh5yc 6-1 shows the force versus the object's position. Fih*-oonqcc*9 apbgf nm/ t 55y2nd 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 (initially at rest) umq6f6n( c +rybn6mqk ;78twjacross a 10 m level surface. What is 87u6qn y+fr6nbmkq(jt6 ;cw m 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 e;h)szsd xkb*d/ zc/455-kg cart (initially at rest) across a 10 m level surface. What is the final spezk/bhxes4*/s;dcd )z ed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required4pm mi4a ql1of77r q2z to stop the mass?47ozq12q7 fr 4amlm ip

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*2i uu1s1 k9/w doivkp car initially moving at 25 m/s, what distance is required to stop a car mov/1 v9*2wkkpsoiu i1uding 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 pr.ez4./t : fn 1padrqghopels a 10-g dart. It is cocked by exerting a force of 20 N over a distance 41q: gznp/dea. t hf.rof 5.0 cm. With 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 of 80 N and a vjzy 8kwvglc 6s/k)1l- (fo*dr sei.f*ertical component of 60 N. The force is applied to a box which rests on a levl. cso*fvwy e8 (-li)g/6z1kr jdf*skel frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, strikx /6(qylr:b 1ie-ztc pu9 l+gjing the hay with a velocity of 60 m/s. It penetrates a deptht x/1 biq6pz(jl:l9g -uycre + of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floopc lod,j( 6 rqbo(zbl) er4 k+dp5pphus.+n30 r to a height of 13.0 m above the floor. What is the change in gravi4horpdbr ,5 o q)z(sd3el npu0pk.bc+lj+6(p tational 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 pla*u::fwysgl 6ane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by *w:a : lgys6ufthe 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 k r80ti 3qf;lrcm. What is the spring rfrkli; 3q08 tconstant?

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 characterize ;mnn bhi nvaro (u5cb 1+3*y6cxgsq/.+itnj;d by a spring constant of 60 N/m. How much potential energy does it stob qg m j;rnnbn+sxoi36(/;5n.uyh1vca t*+ci re, when 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 compres4h ws+v,j uelf 7/dei+s an initially uncompressed spring with a spring constant of 25 N/m by 10 cm f+u,e 7ldsvh4je /wi+.

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/b.ou3v qava0 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0a0bov / va.3qu.)

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 comprctiotyf bfc2t;af*6d :+:s5 m q,tlj/essed by 3.0 cm. How much work is required to compress tc ,f:b*; 2s:oly6+/jtcim 5dat qftf 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 theqyz:fgr ,bgf c mbn4c4n,;14e top of a 50-m high slope. What is the speed of the skier on reachincbe,g :mybnf ,1;f4 z44nqgcrg the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial s2 - udsjpaf36opeed of 4.0 m/s. Neglecting frictionsoda6f u-2jp3, 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 frictionless inclined plan5 +pwwc mjynpqa 4-he,6z (6fhe. At the bottom, it has a speed of 9.8y pw,e c+f456whqanp -6h(jzm0 m/s. 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. When49 .sjt6 -go5 bht4w*md cxclk it is 0.70 m above the floor, its potential energy exthc9otd6k 5mw*cbgxj .l-s44actly 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 e( rt3cq 1s.w(es2cwi6og js b3ah78n from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 14esw6(3c.hio s 8t e7gw (1qbra 2ncsj30 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kineticjei 9vel e*/;h energy of 220 J. At the highest point in its trajectory, its kinetic eee vl ji*/h9;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 star :e. v+xd5ie4 /2 pxnzew4w:.mffmo gmts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wifne fvwwx5 mig em+ 2z4.m:x4/doep. :ll 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 starts with a speed of 5.0.aozlxkm1+zp l rj i+f5ub7 )* 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 upobl7+m+l f1rxiza*k5jz ).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)2 y)yyl3ynloudxu i6/6e xqm-ng8k, 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 is 4qdix6 l / kymnuy -3x2ylu8 e6no)yg,)5 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 (po0vs tsz2yx ,o0ru 6e: xsiu94nwgq*1 oint

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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 li0-v9-.7 kd6vef v-u pohb exwig9b.is pulled 0.17 m away from the vertical axis and released from rest. What will beev 70 .v.wf i9-- xhbvglo e9kub-dpi6 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 an initially unces47 vjddv6nd ) vv:n3ompressed horizontal spring with spring const)nv4v73v vjnd: 6dde sant 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 kglubzu7 j-((0uzi)ofkz 8l(t8:e yub u car to stop for a red light. Wh7:- )uuo k8befyibtl (l0uz j8zz(u(uat 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 betp-;:d2tumilr j1t(9o ry,elk ween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of th rt o,lt k9:yujm(e1ip;dr -2le 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 24 J of kinetiiibasctt+ h*whq(41+ w r4 u1lc energy. The friction forr 1 watilq+t4swiuhch4*+1( b ce 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 leveh* a5f8si a sv+ay-ys/l surface. The coefficient of kis- +yshaa i av/y5s8f*netic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic 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 2 /y-2jp hxfpe ax0k0kof a 50-m high slope. If the work done by friction 2 af /x20kpe yjh0p-xkis $-6.0 \times 10^{3} \; J$, 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 pla5 b/l2cjn r*rune is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plan2/*b5jrc rn lue. 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 resvgd)kus. s-p v7+ rfi.t 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 the7gi).k.rfuvpd s +-v s 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 1 pm b8,0h m5ethyub+5ngd;1kj0.0 m, and strikes the ground with a velocity of 7.00 m/s. What ; 1kp,5d0 8h+my uhb5 jnbetgmaverage 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 heqx*nf *c( )bge runs up a flight of stairs 10.0-m high,*g(n e*cq )fbx 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 g+c hk(c qeevuq0s,ss -w.3h 9r1kd ;dto move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object bys -q(q;9ss1 , +rukwhee0cghkc. 3ddv 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 h u g5fyv*w-najg/u7- zp = agy ng /5uzu-7fw -jv*746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at tp/jdtvl)a :i x*c :1.bdel 1jhhe rate of 500 W while riding. How much force does her foot push with when she is tdlj1jd h. it x:1p/vae)bl:c*raveling 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 the9l2w ob)o i-qwsw)+kl average power deliviow qkso+2ll) -9)bwwered by the engine? (1 hp = 746 W)

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

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