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

1#

08.19: Kepler’s Second Law abou2stkc51s9:adak 2;muo vz+t wt “sweeping out equal areas in equal time” can be derived mocu92 d2saztv ;skkw5 1a t:mo+st directly from which conservation 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 follow elliptical orbits with thzjkpv- 6t5.er t:ga o*2k znq1e Sun located at one focus of the ellipse.” This stat.v2to:pqrn1kae6 t 5z*- jzkgement 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+ecjv amho;q2:t*bh wn*). hqym*2zc attraction between two small objects if the mass of each object is doubled and the * m)q2 hjn c*bzh;m2*qaectw.yvh+ o :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 bo051jmqe i 4 a5l2l762/jx lqa ebqmjdw;wez*jdies attract each other with a gravitational force of 4.0 N. What wilq a;5edjjl6 21/*j4bm q7qwlwlxea ijm502zel be the force if the distance between them is doubled?

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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, X andY, h 4ch1zsyj r.tepj/7secr:8 8j ave the same uniform density. Planet X has tr tzh8:. ers1j c/8pj7jsey4cwice the radius of Planet 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 planetshey+*rh:bvb*b p1 m c 77b1kns, X and Y, have the same uniform density. Planet X has twice thv * myhsb7erh+k1bpc *:bn71 be 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 planet c,a+.r4jhjsr 8w :m .wfg8rocsan be calculated if it is orbited by a small satellite by setting the gravitational force on the sates,8jf8wrm j .h cr:4.swo+g rallite equal to the centripetal force on the satellite. Which of the following would NOT 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 attracts John Glenn6cov jjm( )dks+gyt6: with a gravitational force F at the surface of the Earth. When he made hi6c+sgy6jv o)d ( mjkt:s famous second flight in orbit, the gravitational force on John Glenn while he was in orbit was closest to which 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 only the Moon-Earth system (ignore any infl1vu( abh) 3z tm8cm-ckuence of the Sun), which one of thekbu3( )m vz-mtc1ahc8 following best expresses 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 awa pxo77vyp2 0ob* v.miqy from the earth with a cargo for the international space station, which of the following graphs would best represent the gravitational m2p 7ybi*v 7oovxq0p .force 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 th hzj )mx*uhe8(:ugj2oe surface of the Moon experiences the same gravitational force as a second object at the surface of the Earth.hh2ze(u) g :jj*x8 mou 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 weight, W, 78s +fz um)jjuat the surface of the moon. If we assume the moon has a nearly uniform density, which of the following wous7 zjmf+u8j) uld be closest to the object’s mass and weight at a distance halfway between 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 has seven times the mass of Earth and twice5upid4 (wt ;gu the radius of Earth. The magnitude of the5gpti ;d(u 4wu 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 radius one-half that of Earth and a mass one-f5u)0v), ,bneh g dydz6pw agi6ifth the Earth’s mpe6d au6i 0y,znd )bgvg5wh,) ass. The gravitational acceleration at the surface of the 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 ciew zo9v3*v /bkrcular orbit with a constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the magnkwv93*eoz/ vbitude 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 mas e(*t5q2gheeo s one-half the mass of our sun. The planet’s orbital radius is the gee5 o(q2h*te same as the Earth’s. Approximately 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 satellites, 1 and 2, are put into cira qmgdxx(x b 0cu(-5,ccular orbit at the same altitude above Earth’s surface. Thcb-m 5q0(xud xx(ag,c e mass of satellite 2 is twice the mass of satellite 1. If the period of 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 b(+bp 5,ixj n:8bf3u)zg shkb circular orbit 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 woru*ibyg9e8uxu1ip7 5+nwgbncl 9n z5) d “weight” refers to the force a scale registers. If thenwb+ycu* ueixnb np) u5 5l97g98 z1gi Earth were 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 ed +u/hc-9aii9h1rm7 x 4wa;cgfm8 sgelliptical 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 orbit closest to the sun), which of the following results ia+wm f78a gig/xhi-9 4cc rs;1dehu9m s 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 t/ w30q+q: 3wz6xvzzfddo /veawo stars follow circular orbits about the system’s center of mass. The 3: /qza3w /+wqd6e vx0zfodvz stars are separated by a distance D that is 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 speed vand orbital radiu:nspu -q +w7wq.fr 1nks 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 nqsr7.:p1kwu w -nq f+size of the semi-major axis a of this new elliptical orbit is

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