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 equal areas in equal69qbb5jig(nj *qlcv 6)l3 ll l time” can be derived most directly from which vl5l66lli( b j n*3 bqgcj)ql9conservation 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 the Sun loybvav79,km f25+ m pugcated at one focus of the ellipse.” This statement is best summarized by which one of the following chop,a9 5 f+ubmv7kmgyv2ices?

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 thew ql )mhs+s/(z force of gravitational attraction between two small objects if the mass of each object+ h(lzms/q )ws is doubled 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 attract each other with a gravitational force of 4.0e4g zu3jla kkya(z,b5z +9cu5 N. What will be the force if the dista4guyz u3cz(kj z5k,l5+eaab9nce 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, have the same uniform fy3wtw( r n60odensity. Planet X has twice ther( 0tn3wyowf6 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 planets, X and Y, have the same uni2r 7 tbj3.p7xyz. gvhzform density. Planet X has twice the radius of Planet Y. Let p.v tyhz.j7z37r b2gx $v_x$ 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 can be calculated if it is ohexbk3yy t;h3 u07qkxe)8+y vrbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite. Which of the following w; xkx vq7 3etuy08h+kh)bey3yould 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 Glr3 e2w81sz; +bzl,xf p5tzft aenn with a gravitational force F at the surface of the Eart 2pz f1atwr ;8esfzxzl b+,5t3h. When he made his 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 influence ol paf0 lld3s8 r) a;x66uomrfkb+yq+l+-p9uo f the Sun), which one of the following best expresses the magnitude of the Moon’s acceleration abou y f3u +-)+b6l +ulfo9;8ks0qrdroxp6pa llamt 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 blas :37pumb 9my5id hbww6ts away from the earth with a cargo for the international space station, which of the following graphs would best repr36ywbp5dimmu9bw h: 7 esent the gravitational 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 the surface of tii6x9mte ubs 4:a b::yhe Moon experiences the same gravitational force as a second object at the surface of the Earth. Which of the following would be a reasonat:m: xibui 9esby:4 6able 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, at the surface o jv;-yftq1a sizm3 a9-f the moon. If we af-q9szi1-;a3vtjm y 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 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 anqi*x; 8ebluzyqwqo0tj.; a/3 d twice the radius of y. *leaq/ij03uwzx;q;8qt boEarth. 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 radius one-half thab8u n-i:3ug5xdwxbg 8t of Earth and a mass one-fifth the Earth’s mass. The gravitational acceleration 8w -g3n58d xgb:ubxuiat 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 circular orbit with a consta;p v*llln7(l stwos:4 y q6i*rnt speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the magnitude of the gravitational force exerted on the satellite by Planp7o s s*vql il( yl*tlr;46nw:et 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 starwkg v6ywe/: rjh 9r75k with mass one-half the mass of our sun. The planet’:5rkv7 /hjew6 9gk wrys orbital radius is the 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 putnxti km/s2 arjlk-k (wob 2 huz.+;8u7 into circular orbit at the same altitude above Earth’s surface. The mabol-ri u+k xn/ (sj8uzwk.2kha7 mt2; ss 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 circular orbit around the Eangkc7dnp 1l +(rth 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” re maka,j2;ut (kfers to the force a scale registersmkkat;ja,2u( . If the 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 elliptical orbit around the sun. As the comet moves fgid-,venj, fx, zyh d:(wp/6a rom aphelion (the point on the orbit farthest from the sun) to perizhy: w,6e -nd ,advj/,(xpfighelion (the point on the orbit 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 j , uail6yp 377oyhmxx4r4g2 qfollow circular orbits about the system’s center of mass. The stars are separated by a distance D that is large compared to their size and are subject only to their mutual gravitational attraction. The oruxi4r74x 3jgayh2,p q yl 7o6mbital 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 radius R aro rjl /xy1x4fi/und 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. Iyfji/xx4 /lr1 n terms of R, the size of the semi-major axis a of this new elliptical orbit is

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