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

1#

What is the correct unit of work expressq7w 6r) exerdj1em70ced 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 yh27,oxio4iv 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 )/vgubt)u zcu* +lj3b hard against a stationary brick wall, the amount of work you do)c*3v bu+j/g ulb )ztu

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 much ;(vxfimb n /a9work is being done in holding the box in this posi/; ivb af9xnm(tion?

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 cok y/mwichn (0xrhy:fc )54c omm02n;knstant velocity carrying a 10-N object, the amount of work you dwm o4hrhc52; f)xnck(m/y:i cnm0yk 0 o 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 its originq55gni6*at e sal position. If the5n*a6tsq5eig 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 mo u;.nnuvau9 9/n0zz zp4g5qthe 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. 93+vy9 w dt6fk9 xzdonCompare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes dodzwd93yk9n96t+ f oxv wn.

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 fm9h nv 0556;v+ceh9euaxu dxversus position (F vs. x) graph, representsm+xevdcv55 96eun9xfhu ;a h 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 versus1l l2qo6v e7;q1gk iwiu ,s.mx:smj6r position (F vs. x), what represents the work done by the fm6xu,ei 67 vjiwqqosrs:l2l1. k g1m;orce 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 kinetic energyy9n4 ck 5pmof1

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 obpm*owy 22tncaym09l0qog : y; ject'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, then the object's kinetic enesc)c*nx 2 vclc+u ihn7.: ka2srgy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed ofc8 i vufw9c09x the car. Which statement is true about the truck'9c 8x9f w0vicus kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J ozxs7;sm; 48+ f5mzz gmsvx( jsms+q0has half the mass of car K. The kinetic energzs xssfm+jmz ov +m;0 g4s7xms(zq;85y 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 ofba/ffw0lkm) ,. hvm 1q its original speed. What is the ratio of the final kinetic energy to the initial kineti/vlm)mqkb1 hwf0af., c energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a sp-g)07vgzi/r pk5ufto5 g( vln eed of 5 m/s. If both objects have the same kinetic energy, what is thegv upl 0or5t- v7)fi 5k/gn(gz 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 spee m (nyiqhbd.e.1)ncg*d 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greatebd )ghnmyic q* 1n.(.er 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 ts7lq64vlq;q in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded,6ts4l v ;ql7qq 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 thrmaf7no ): kp(98eu gxe Sun in an elliptical orbit. Neglecting any friction effects, what happefk9)pe uom8a x:7 grn(ns 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 prinmba;ydw8, (pvngg.9f ciple.

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 havewa8ax;ae(q 0 :)o c 7eskpxz:x g-pr:f 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 frome n*a2241j m rbllz40wk rtz*x rest a height h above the ground. 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 the fiaz0l tx m j*kz4r nlwb*r2421erst 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 7izbvah ,bcxb;(8 5m2zi/p+v6l fwa34 ivvaxspring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of v i2h86lxi4,a a vc (bfxzwz3;avbvb5 +mpi7 /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 enem ,wfzju1xrvr25/ q:xrgy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its potentiaw bc(7c vh9cp9l energ(h9pc cvc9 b7wy 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 5v5e7l tr6whj -q4mdkof 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 heavy obj,d4:e.mic,(ge7o 5ysheg bbh9 /uvz mect are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greaterm7us4,5h vmc/y:dieh bzog(.b 9 ee g, 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 v n/jer f5-28wv/1yw ;rmz9ykzmut1d$m_{1}$ 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 conservatgtem . w(-3,zoyie5ud,t:e ueion of mechanical energy for conservative forces. weg5ouy.:(,dzme -teite 3,u

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 buirotvh)3b hcoh )3x7+xha ;+nqlding, through the air (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 thehhcxt o3)nh r7;q hb a)vxo++3 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 ni 3zovax95 e3qot ignore air resistance. How much gravitate5 qvzax 33i9oional 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 gravily- 9ounj-iq0eolm. ,tational potential energy. Do not ignore air resiso9 inm-e-0uql lyj o,.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 conser4roozf/b;sm *vation 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 isv-) labxyh: ki qjlnvg;v2 20j)+oh:m

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unitc9t *da5d x9y nr7zbz7dpz.: ns?

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 ulfmgd90spbv277 etd4y g j5v(nit 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 them9 .floe1 0uof work in one-third the time. To do so, your power output must haveu om.0le19off 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 acceleratilw9e- iki;;ij;pcq; 8j ac ;tkon, 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 helejko*tco0 b7d bki58(d there. If the object weighs 90 N, how mu(djeo ko* t 5cb8ik7b0ch work was 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 mvq5/06jswmg y , at a constant ve/ mg j5ws6qv0ylocity of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with -cu;u-jwzkh- a constant force of 5500 N for a distanc;u-kj-zc h -uwe of 50.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward widd 7 m(fyi ge3:vr8o)oukuk- *sct6p-th a constant force of 5500 N for a distance of 50.0 m. What is the wodf):opci6*7e sg -y dum3t -uo8r( vkkrk 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 wiwt/o;.d9nltqdl86 t x th a constant force of 5500 N for a distance of 50.0 mwdon9 qtlt x6.t;d8l/. What 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 6.0 mg*,7mka2 mi2l p vr2utet2(j3wwj2 q 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 fj0ma+zj;cb-. wa* qwpc *sb,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 t-.y/0 x0qz+raej4f-c2 trm2h cpvopsister Sarah in a sled on an icy surface (assume no friction), with a force of 60.-v jehac.zy pf+4rtt m20cr p2x-/0oq0 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-o * lio /k( qf75br1e)jw4 bpe;t9bujs1 shows the force versus the object's position. Find the work done when foiq*tp b9/klo5);ej(jbe 7w1b4 sru the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6- 95b4j :3ayngkv2p0v bx(f his1 shows the force versus the object's positbfv5g:(2 y j03kv4sbin 9phx aion. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an objeo0 kla.xik kf+(.7lhgct in the direction of the force. The graph in Fig. 6-1 shows the force versus the obi.kfh+klkxa0ol.(7 gject'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 t.xym0smt l0r4; 1k amyhe force. The graph in Fig. 6-1 showy 0k.y sr4;1ml 0xmatms the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg ca j1y 1sl/h4+o vyn9vqc*b2p*s 2w crshrt (initially at rest) across a 10 mbvyh1h nlsyw+ 9c12*rp qv jc* /os4s2 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 (initially at rest) ax yysg,z)q7 .8(l cb*v xuc)nacross a 10 m level surface. What is the final speed of the cart)ga 7bsq cnl8xyxy u*.c(v)z,?

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 wiogl yiq9lm6 2h7i y/.cth a speed of 5.0 m/s. How much work is required to stol7 l2qhi/i6yg.o9m ycp 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 d9uin:ttn5mgx07 g g7dg4s6 liistance is requirg90g 4tu:i 6ngdtilm7x7 gsn 5ed to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by e+ ob.bskk7o (33fzw.9xsew ig xerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible m o3os(i.g3k .7swe 9fb+wxk zbass?

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 acg:y)o;h* d l4p(bb(kmsq*en )oc6icomponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level lda q(b*i 4 ckyom sbge*(p6:ho)n;)cfrictionless 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 shi*jf g:/ a 3 ca-yswyxbdut7v-+d.zf1ot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s..3dfyg ab7iv -w-z/yx 1js*ufd :t+ca It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.5n+3 c; qd-zatccw :sd00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential ez wqdc5dc3a+t c -n;s:nergy?

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 incliyez j w 7ji.3ia mlo,7b71bg-ened plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the am o ,i 3-zljb.weby7ij1ge7 7push?

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 sp1z*rhslv:dog13w 6 :gr- sbypring, causes the spring to stretch 2.0 cm. What is the spring const3*s- v g ls::dz1gwy ro1bphr6ant?

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 much potential e.n ot4d .euk,pgud4k) nergy does it store, when strett u).po. d4k gk,4denuched 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 ah3u 3 y3h0s*h psgct8qn initially uncompressed spring with a spring constant of 25 s s*338ph3y uc0hght qN/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 stretcl*89s ppkg-bx h a spring of spring constant 40 N/m from x = 0.20 mgkb9lsp x8p* - to 0.25 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 9vxtr +shs*ah)u9b616y kryi. How much work is required to compress the spring an additi uthy699syv s+ rx*ab 6irhk)1onal 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 istpz*d6l 6amqx-d g :a- the speed of the skier on reaching the bottom of the slope? (neglect frq za*xlg -d:d6p at-m6iction)

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 w4 s lxreq5zct l9-t,v(ith an initial speed of 4.0 ml, eltcq(s-t 594z rxv/s. Neglecting friction, 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 plane. )tj2+k. otvlc kvmub; w ,nb.6At the bottom, it has a speed of 9.80 m/s. Wblt6u. ,+2c)w t.j;vbmkko n vhat 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 flooy*x )d0rngd34pd 4amor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it mod d)g oanpd4m* 4y3xr0ving?

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 4xq d g. u j;nytn77-/ch9ukdnfrom 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 vertical height does it rise?-;u7kntqddhcjn 7g 9nu.yx/4

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 kineticqi yz uxe1fk-8(:/bqq energy of 220 J. At the highest poieqqq1(i - / fx:k8buyznt in its trajectory, its kinetic 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 a poinat; ory ;ntz, 8h-mt(o8ms)tot 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 th mtts;ao8 (o) yn;mtoz-r,8hte next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point udb av e8f1.y6r qkm.445 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 thyu4 rvf.8dkabq me .16e 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 p as8: honjce1wmqs35ao +tu2 qp),y) bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed oo qc m j o2a puqa),ntpse:1wsy+h853)f the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of th.fck 2;c 9pcnie ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.23 m away from the vertical axis 7 n6w- crnc3 5xpwepi7and released from rest. What will be its speed at the bottom of its swing5 e6 xw-in7ccn7rpwp3 ?

A. 0.3144 m/s

B. 0.838 m/s

C. 1.258 m/s

D. 1.048 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 2jt7sinf+ri9x 8as3 c68+a,chmuhb :q5 m/s hits an initially uncompressed horizontal spring with sprhcan3:ris+j8bx9u7 qm6i, f th +8csaing 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 20000aa ajx..hf7ke 6d4 fo kg car to stop for a red light. Wxfha.a0d o. k7 afe46jhat 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 :c)r59h avz lb z0t7yohch*zd4x b33ga horizontal surface is 50.0 N. If the initial speed of th74y5tz3 h cb gzxoh cra9l)z3 dbv:0h*e 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 rougp*mtle xiv y8-7aj /r 3jk1;axh, level surface. It has 24 J of kinetic energy. The friction faepj xr/3lk-vix71 m;j a 8*tyorce 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 on5jsg dqhzwm +fk6dv22m 5atn*2akm b0v8qq0 2 a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 65sqm8q+mw0 02qjb2m*zn5g v22dkafvht d ak10 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 of a 50-m highrqk:jq ny -2 qq:-;itvmni*+g slope. If the work done bq:g; q qk qji:yn2 v-i-m*r+tny friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane ixiybmkdxl;+/j,bl(4t t(y: ,qkiq;zs 4.0 m long and rises 2.0 m.mb4k/q:i x,,td(;y;jyq+k i lt lxbz( It requires 3200 J of work to 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 fqm u)59m;ahj inz x)a*rom rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic frictionh a;)xai 5j)zm*unm q9 between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground wioi9j6griz/+ c.et4v aj*6osd th a velocity of* ri iajsz c./v46o9 od6tgej+ 7.00 m/s. What average 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 5ki:ejg*u o y-u e+kf,runs up a flight of stairs 10.0-m high k- *g5ei uukej:fo,+y, 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 constant velocity of 5.004 u36rh rmqpy m/s. What power must be delivered to the object by typ3 0r4 urm6hqhe 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 ars)v c n2(; 0i4qjiiixqe used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746qjs n c(024ii)qi xiv; 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 the rate of 500 W while riding. How mu4c gh6k k5: 4reo(k9cmwr swq;ch force does her foot push with when she is traveling at 8. 6kco4m4hc(: krwq r59;ekswg 0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the avera4jb,k9t - nj4yq ebzt6ge power delivered by the engi64n9jqzyt,tk -bjeb4 ne? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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