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

1#

What is the correct unit of mqp( 5x 7u77-miiidmq work 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 ;ke1x*oksmv4n ;fm+5b1 tsk yno motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary lr9 tv+ *pi-jfbrick wall, the amount of work you dol-fri jtv*+p9

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.flp.s ot0i4 8g How much work is being done in holding the bog 4pfi0l. so8tx 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 gdhuj 4-rjz,:forward at a constant velocity carrying a 10-N object, the amount of work you do isrzhju 4:-gdj,

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 watersmy;xme +vbn05, 5y ezk,5wch is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how muc,0 ,m5zxv; m+nw5ecey5yskbhh 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 wo:s6at6*5 iedyltq+ ot rk on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work dopl(/ wy gr aii.ws93n*ne by gravity while the ball goes up with the sign of the work d(lw/ra* 3piyg i.9 wnsone by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Fo x3ok *g( c-g+sbqw1lxrce versus position (F vs. x) graph, represents olq+gx(c -b*3x1wkgs

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), whaj ,s s42n52d b, azciput7rl/ct represents the work done by the force Frb2,lj2csi7u nd5p t, /az4sc?

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 objp l,j)2d6zw idect is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is necc yn,((i/rge,)h3 su8hsgs v gative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinet4pvg:/v:n9mtk4y f ri ic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving,:elfvyb- wl */ owbls7rx /z: at twice the speed of the car. Which statement is true about the truck's kinetic energy c :vrw/ofbz e lw*,/llb:y x-s7ompared 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, amzi6o,f0)mzq yf.c+b nd car J has half the mass of car K. The kinetic e .+mmiz)cq0z6yob f ,fnergy 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 origina(x )p- nnqjqp8k fnk.:l speed. What is the ratio of the final kinetic energy to the initial kinetik) nq.-xj(p8 nkfpn:qc 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 spepu 7te7fcy8u :p *uku4ed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio offupc7 uy kp u*7:4uet8 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 rd: 62 p9vmlccxx;u*nih2jzm:ojm, 5 moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels th 2vo ,m czijm5p2u:r:d;nml jx69*cxh e 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 brakesgh)jq 8ukjva a5 48ex 2*.rxce of your car in a panic, and skid a certain distance on a straight, level road. If you had been 8)k q.28jx4xva*gcrhee auj 5 traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits txsl/t6 dt4 djdvu4:fr r*8e) y 2t1w(vdrn/pnhe Sun in an elliptical orbit. Neglecting any friction effects, what )vnrt *ddu/ xtjwe n y1s (f4:r/8d2r4l6pdvt 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 princh9 jmdr a+ s,1sd03irss; crh5iple.

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 potentia 4 :dkmy. fuwm12mc)kel 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 the ground. A second objj obtr :(n3cdp3g5v0k4e c1*oyj 6kp5gh ,egoect with four times the mass of the first if released from the same height. The p4pr3ob0(pj5e3g6vghety5oc o:n *1kc , k g jdotential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring cac0* qy2 r9msakpa:4kw qyy,s7uses it to stretch 5.0 cm. If another yakk wa ry,y49 qp2:sm0 7s*cq0.200-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 sysvw59 owx0ssl,:3vx of tem

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 potential ened ezla ddbhdd11-. +)rrgy U. l-+d)baddhe d1zr1d.

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 asc wf8s8 o7mv5 gq;)zof 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 object 9*cz54 .)igbrmg uofhare sliding with equal speeds along )i m5gf49hrzuogb*c . a level frictionless surface. They both slide up the same frictionless 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 aqu a:66lpo -a$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for cd+ 0e4/mpeflwonservative forceswe mpd+l40f e/.

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 d )2wea:1 cfxc2ch9nm top of a building, through the air (air friction is present), to the ground below. How does the kinetic enerxh9m ef c12anw)dc2 :cgy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of k) n2x:n xx7 i6ex6wpfwinetic energy. Do not ignore air resistance. How much gravitationalp:xnxe27ixx)wn6f w 6 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 gravitational potential energy. Do+-p7wt 1v .gv*dho ydn not ignore air resistance. How much kinetic energ*t7h1dy-w+ov. dgvpny did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of ey;nc9qe45 -mrxx gnc0nergy.

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 is1y(ty2/e) yj 94ryplg7 r klmy

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 ex9kz5 w x3nwvwan mx)9/pressed 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 s/ w8gk oh6h1fn n5z5yof power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time. To do sooixh 1jta5 *q3(jf:f 6ejw(po, your pow*t3ei:fa p(hjow (q15oj6j fx er output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine m)o5m epw5(vfb ust

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weighs 90 Nxm tcs5.4y c+b9q.mfo3er mp)k,z of., h5sm)+9m,er3qoftx pkm y c.z.o4.fbcow much 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 ubhb7ptf: ,za 9p in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. Whah,f ba:bp7t9z t 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 forh89 p zjj9xr/hce of 5500 N for a distance of 50.08/jx zh99hrj p 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 with a+vj,kc8sv2 sosqhd;m4mev/0 constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the ecv4;0vmesh/s sj2,q dokm+8 vlevator?

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 forcl eq n.r-hxy3k 0ei41ie of 5500 N for a distance of 50.0 m. What is the net work done on i3i qxyel-0.4r1nh ke 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 b4 yqu7 hi3y,0z,ti1-pw eq emm 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 slidesrvrwu v)v nq/o-ry,x 8h0q;9w 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in ah,g -:,se6inlz44nx6bdf) wo cv9 hdm sled on an icy surface (assume no friction), with a force og dbw4 6h4 enc hs-ol,mi,n x:6)zfdv9f 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 tc:5w1x go99z nkzvfu8he direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find tc9k9un5vz 8zwx1 gf:ohe 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 ccx f;w;7fkid;m0s(cc5rn /w direction 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 from 2.0 to 4.0 k(m c s0/ cdxnc57;fwfc; w;irm.

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 thf+psm *kb:re0d .5jlyek 5yb +e force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object bek5lbjrkem*dy+ 0:ysp .5f+ 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. T0lxd6i b: r./+bkua.+p ecsfj he graph in Fig. 6-1 shoi: +ek .b/ f0.r+bp xslcjadu6ws 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 cart (initially at reo .7z9zlc+qyoe x,l6 fo7a 8qwst) across a 10 m level surface. Wh+,ocoy6qzwf79 . e7 zo8lq alxat 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 re +ysembu .. (tjtrp(cjuz:t,0st) across a 10 m level surface. What is the finaltu:j.m,tysz bj rpe(.u(c+t0 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 speed of 5.0 m/s. How lod.vk.bc -sddp-e1-much work is required to stop the mas kodv- secdb-dp.l1. -s?

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 aase0ngo11(85lim a ecar initially moving at 25 m/s, what distance is required to stop a caasi e( n810mgo eala51r 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 exertingde7a)e vja)tgjq -39v a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gunej) av qg3-ed)vj9at7 , 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 vey: mp491z1er-qd)ednuvvb j7rtical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontap bn zmr v1q- j)d4yue:1ev79dlly 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 at0xawm a2t t 3; +:b ymynggr*,,akjq; bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrowttryj:, m3ak+;q ;b gg2ny t,*a0w amx?

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 o ;qr in9mncx;dn )o82k0f -kpcf 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitatp nr x)9q;o-d82fn;m0c n ckkiional 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 uwz6yj,1 jc;oq p an inclined 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 p joz6jw,1q;cyush?

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, cam57dkmg k*/(xnt idg,uses the spring to stretch 2.0 cm. What is the spring m*tknigm( kdg5x,7 d/ constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/wsn :mf 2ucxyse5(7y,m. How much potential energy (nyyxfuw:ms2 c7e5 s,does it store, 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 compress4ke1sq .2cewnvu) x ew5x*3bz an initially uncompressed spring with a spring constant of 25 N/m by 101 )ew*4s v3n.eukze2xw c5bxq 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/mb xi3)z0k; a+ nysj+v( b)zdfi from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.z)bikf(;zd+3) xi0vy+s j a nb)

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 rq41 k7bza f1rpb hi26is initially compressed by 3.0 cm. How p7b2zbakr16i4q hr 1fmuch work 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 50-9g/l gq/wtba,m high slope. What is the speed of the skier on reaching thq 9,/gt b/awlge 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 w6,i/ m9 0+zwyem.limitgwb j-ith an initial speed of 4.0 m/s. Neglectziegwl m,6 .ti0ywm 9j- +mbi/ing 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. At the bottom, it has a (dpfn46 uhx z)speed oxnu df4)6z( hpf 9.80 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. When it is 0.70 m above the floa 9x;gt m1 *.ipjfhbt1or, its potential energy exactly fp.; 9a mh*ig1 tjxbt1equals 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 from l8at7ef c4hx/ ground level with a kinetic energy of 40 J. At the exact top c7thxf8e/4 al of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves - nk**tpkxc9,riv/9 8dmxs bw48 qhjvthe ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did wtris,jk mvdq8*b9 x cn8k4x-*9 hv p/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 45 m above bww2niws3hr(- bgoe*8b0k3fldh7 *qgt4 t8uthe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed o2d bgb78 h l w48kfnugo33ri-t et(bww0*qhs*f the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

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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 starrqo8, zrfz3 ,z 5e;afs2dodc*ts with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m abosz, o2,rc;ra*d dffo8qze3z 5 ve the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a spea,;gk-xh 4 ffu(ue4vped 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 x-uv g(4 f;kfa e,phu4is 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 106w+2ghx ouvo e 5rdethe 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 ist9 .y ,uv0:oh+w oblcw pulled 0.19 m away from the vertical axis and released from rest. Wtub 9oc wv+o wl0,.:yhhat will be its speed at the bottom of its swing?

A. 0.257 m/s

B. 0.686 m/s

C. 1.03 m/s

D. 0.857 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 horizontal smzpqa; xg.(2rt(gl y/ pring with.l;(zq2(m xpg a/yt rg spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slo3kq:zu qexh;* u o/(pdws down her 2000 kg car to stop for a red light. What work is d;:( hoeq dxpuu q*3z/kone 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 horizocy en08+ig/ lgntal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, whae 0giny+lcg/ 8t 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-uub1 77vmie o surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wibvm17u o e7ui-ll 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 2.0zl : t;6jx.yit-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is yx;tjt.:6 lzi 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 dn5g o rjspfbf+;,w: e:: x4gmfrom rest from the top of a 50-m high slope. If the work don: + rf,jogmw:pgxed5nsb f 4:;e by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The planedz86zv(u4 .dvh1 ft4dftv h*h 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 . vd 1fd v8utf*hh4v 6(th4zdzplane. 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* ,cb;,8lqx s)+tfjrvm:sxqg / s5wfl of a plane inclined at 20e above horizontal. The coefficient of kinetic,t8fxsxls;/ v blc* +j: qfq5r)swm,g friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground with ae30 ) elyu,wch mzw4v5 veloci54vezl,3y huemw0w )cty of 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 runs up a flight of stairs 10s fzm0i z1 zz)a+2i aw7*c*rzo.0-m high, im7 i*2wzizczf0)r+a 1 asozz*n
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an obw fre0eh 5l(is (8 l 9,5ggwvm1j:zubkject with a constant velocity of 5.0 m/s. What power must 8mwj , gb lv5f li g91ze5eru0khw(:(sbe delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs(cr+va8ow up * for 1.0 hr? (1 hp = 746 W)ou8acw+rp( v*

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 ridis z2)z6dk d h3nl/wlf1ng. How much force does her foot push with 3h2wd1zlf z6ksl/d)n 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 i),ku2mu91:y rkjhad d8*epoj n 7.0 s. What is the average power de9uu2 ,kh1p dm8ajjy ke:*)rodlivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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