Gravity and Planetary Motion - 无忧得胜-网上国际课程 (5edu.win)

1#

08.19: Kepler’s Second Law about “sweeping out t3bxu n774kx oequal areas in equal time” can be derived most directly from which con773xokt u4bx nservation law?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.17:“All planets in the solar system folhq ()5 g jt(hmaiec,+6th0bodu6, bdelow elliptical orbits with the Sun located at one focus of the ellipse.” Thid hh 6,bu((a05mtt ob6i qg+echd,e)js statement is best summarized by which one of the following choices?

A. Kepler’s First Law

B. Kepler’s Second Law

C. Newton’s Universal Law of Gravitation

D. Einstein’s Law of Gravity

E. Schwarzchild’s Law of Orbits

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.21: What happens to the force of gravitational attraction between gen*ul2 pf8zn f7 qp7*two small objects if the mass of each object is doun8fg**27fzp eqn p 7lubled and the distance between their centers is doubled?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.09 Two spherical bodies attraqc lx2h-y.,/kzj:uf qct each other with a gravitational force of 4.0 N. What will be the force if the distance between them is doublqcjh,-ykqz2. xf: /lu ed?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.27: Two spherical, non-rotating planets, j6mn1ccueu 4(X andY, have the same uniform density. Planet X has twice the radius of Pla eucc 4mj16u(nnet Y. Let $g_x$ and $g_y$ represent the accelerations due to gravity at the surfaces of Planet X and Planet Y, respectively. What is the ratio of $g_x:g_y$?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.46 Two spherical, non-rotating planets, X and Y, have the same v+y9y -za-f3ulzi9lq uniform density. Planet X has i- ylfvl 3zy+u9-aq9z twice the radius of Planet Y. Let $v_x$ and $v_y$ represent the escape speed at the surfaces of Planet X and Planet Y, respectively. What is the ratio of $v_x:v_y$?

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.16: The mass of a plant hwtc.jt)v6/et can be calculated if it is orbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite. Which of the following would NOT/6 t.)v cttwjh be required in this calculation?

A. the mass of the satellite

B. the radius of the satellite's orbit

C. the period of the satellite's orbit

D. Newton's universal gravitational constant

E. all of the above are required for this calculation

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.11: Assume that the Earth attractag( w5cs4fqq44ypxpa hr 9+rxcq 2z:x.ov7 9hs John Glenn with a gravitational force F at the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn while he was in orbit was closest to whichqs o yga x4 4 h(.pqzw:q9x7r9ch2x+rc5av4pf of the following?

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.30: Considering onl-2wlro)0v lz jy the Moon-Earth system (ignore any influence of the Sun), which one of the following best e2zv jll0 r-o)wxpresses the magnitude of the Moon’s acceleration about the Earth?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.19: As a rocket blasts away from the earth with a cargo for t1 qn/ya)zqxwht0+1ot he international space station, which of the following graphs would best represent the gravitational for th+0qzyxt/11w)oa nqce on the cargo versus distance from the surface of the Earth?

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.33: One object at the surface of ) 4uo4ofzme-d g y3*juthe Moon experiences the same gravitational force as a j) fyuoze4 o-gu *m4d3second object at the surface of the Earth. Which of the following would be a reasonable conclusion?

A. both objects would fall at the same acceleration

B. the object on the Moon has the greater mass

C. the object on the Earth has the greater mass

D. both objects have identical masses

E. the object on Earth has a greater mass but the Earth has a greater rate of rotation.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.24 Consider an object that has a mass, m, and a t/ 6ilndzx3)yoyc5hqs d i000weight, W, at the surface of the moon. If we assume the moon has a nearly uniform density, which of the following would be closest to the object’s mass and weight at a distance halfway betweenddzy h3 0qin0tc0liyox56)s/ Moon’s center and its surface?

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.23: A hypothetical planet hasb9a3is1m6rls5wef6t* )s u2cet 6e -xi es7ff seven times the mass of Earth and twice the radiua5 el cfr7s3uts61 -xi2tbem6eef9 iw *sfs6) s of Earth. The magnitude of the gravitational acceleration at the surface of this planet is most nearly:

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.24: A planet has a radi wk dqnt1q0q,8us one-half that of Earth and a mass one-fifth the Earth’s mass. The gravitational acceleration at the surface of theqqn,qw k0d8t 1 planet is most nearly

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.38: Akg 1200 satellite orbits Planet X in a circular orbit with ah o4 ky6;su9 qbg2k8ky4rg az4 constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What iu69o4z2y 8s hgk br;k4k g4yaqs the magnitude of the gravitational force exerted on the satellite by Planet X?

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

94.34: A hypothetical planet orbits a star with mass one-half the mas dza9k532wv uibori.n b/z /0ss of our sun. The planet’s orbital radius is the same as the Earth’s. Approximatz/b9kbru o sanvz i.w i02d3/5ely how many Earth years does it take for the planet to complete one orbit?

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.12: Two artificial satellit*h g6*z+r7rj;syzlf r es, 1 and 2, are put into circular orbit at the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of satellite 1. If the period or;67 zr+s hlrjzg*yf *f satellite 1 is T, what is the period of satellite 2?

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

15.22 Satellite 1 makes a circular ;s 9jshvla0:z/oos6h6o (hs8 ry dob6orbit around the Earth with a radius $r_1= R$. Satellite 2 makes a circular orbit around the Earth with a radius $r_2= 2R$. We let v represent the speed of a satellite and a represent the magnitude of a satellite’s acceleration. Which one of the following choices gives the correct relation between the speeds and accelerations of the satellites?

A. $v_2=\frac{1}{\sqrt{2}}v_1,a_2=\frac{1}{4}a_1$

B. $v_2=\frac{1}{2}v_1,a_2=\frac{1}{4}a_1$

C. $v_2=\frac{1}{\sqrt{2}}v_1,a_2=\frac{1}{2}a_1$

D. $v_2=\frac{1}{2}v_1,a_2=\frac{1}{2}a_1$

E. $v_2=v_1,a_2=\frac{1}{2}a_1$

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.33: In the following problem, the word “weight” refez a )1(sq+yq1qpccb i3chuw (w.0n5eirs to the force a scale registers. If the Earth we ys ach1i5w1qwbi cu(q )z3.qp+(e 0cnre to stop rotating, but not change shape,

A. the weight of an object at the equator would increase.

B. the weight of an object at the equator would decrease.

C. the weight of an object at the north pole would increase.

D. the weight of an object at the north pole would decrease.

E. all objects on Earth would become weightless.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.42: A comet moves in an ellipss j06ef:vv+ g( xpanq/3fw c3tical orbit around the sun. As the comet moves from aphelion (the point on the orbit farthest from the sun) to perihelion (the point on the orb6wgsa3+ (svvce q /xpfj0n3:fit closest to the sun), which of the following results is true?

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.48: In the binary star system shown, the two stars f.f.6gcrqqe ;follow circular orbits about the system’s center of mass. The stars are separated by a distance D that is6cr gffq;e.q. large compared to their size and are subject only to their mutual gravitational attraction. The orbital period of the star of mass M is T. Which one of the following choices represents the total mass of the binary star system?

A. $\frac{π^{2}D^{3}}{5GT^{2}}$

B. $\frac{4π^{2}D^{3}}{5GT^{2}}$

C. $\frac{4π^{2}D^{3}}{GT^{2}}$

D. $\frac{16π^{2}D^{3}}{5GT^{2}}$

E. $\frac{25π^{2}D^{3}}{4GT^{2}}$

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.50: A rocket is in a circular orbit with speedyzh7jnp *xd7uywmtk qyr .3o45.2tc3 vand orbital radius R around a heavy stationary mass. An external impulse is quickly applied to the rocket directly opposite to the velocity and the rocket’s speed is slowed to v/2, putting the rocket into an elliptical orbit. In terms of R, the size of the semi-major axis a of this new qu2 op3h. jyz7.4d7w y3krnx 5tycm t*elliptical orbit is

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