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 ary zdn01tfzp 65uo3h5weas in equal time” can be derived most dirodnp 5tzuy0zf365 h1wectly 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 the Sun log l)xb i8:8 bwk)t)tewcated at one focus of the ellipse.)x)t)twg ke88 iblb: w” This 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 z-fbn9tde-6ttwo small objects if the mass of each object is doubled and the distance between their centers 6bdet9-n- fzt 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 bodiesc ,igb86 nr ,onh6oe2d attract each other with a gravitational force of 4.0 N. What will be the force if the distance 2rg68 , oodheb,6incn 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 4v*aun0k si5 oplanets, X andY, have the same uniform density. Planet X has twice the radius of Planet Y.kiv50ua4s n* o 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 9mys:547hfnsw,yclaq;dn / qthe same uniform density. Planet X has twil9fdc4q h :q/n;a nyw7m,y5s sce 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 pos1yayyj6ag w/u7 v, )lanet 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. y/gju6, vao )sy 1yaw7 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 Glenn with a gravitatimelb8 o f6ds24onal force F at the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn whi2e48smdlbof 6le 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 sys w6e 9/-q9p dqe jp.6yuzfclcy*tva1:tem (ignore any influence of the Sun), which one of the following best expresses the magnitude of the Moon’s accelerat *-fc c6da6.yeyplqp:w1j/zuv e9 9qtion 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 froz,n;rhcyeg/ 0wi1wpjm g5q 2y(f+7 tzm the earth with a cargo for the international space station, which of the following graphs would best represent the gravitational foemp h,grznfc 01 (t7+/i gwzy2wqy;5 jrce 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 the Moon experiences the same gravia f-mi(1o imc x.ko/: k1zbkd(tational force as a( :/k(-ci1dkmboiaf1ko m xz. second 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 /qg/q8tk.b9 crz pyvc tlp+1u yjv:4* a weight, 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 between Moon’s center and its surfac c81p .u+zk/9tyyv/ gv j*4qcqb:rl tpe?

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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 plane39rnlz 1h-e gvt has seven times the mass of Earth and twice the radius of Earth. The magg v rn9h1l3z-enitude 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 radiou5lm cq6(ll; us one-half that of Earth and a mass one-fifth the Earth’s mass. The gravitational acumlc65lo; ( qlceleration 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 circular orbit with a cfn e39kn v8:q5wwi xvjay30 6bonstant speed of 5,000m/s. The radius 8b ynfqij5n ve:36x39 vw0 awkof orbit is 7,500,000 m. What is 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-wr3 vln;l. 1zk*7xhv uhalf the mass of our sun. The planet’s orbital radius is the same as the Earth’s. Approximately how many Earth years does it take for the planet to complete o 1z*7hn3v;kwlu.xvl rne 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 circular orbihq4 xvg(g ,+brt at the same altitude above Earth’s surface. The mass of satellit 4v(xghr+qbg, e 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 arsi q,6.mm+nshw34 pztound 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 p0rp)ime s574ojxu6w,g t f 4cwroblem, the word “weight” refers to the force a scale registers. If the Earth were mercouig5f 7x,t4 p sw46jw 0)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 9 vmwwu:8.e yiuj7u ga8k2r9i orbit around the sun. As the comet moves from aphelion (8 aejm29:w ri 9u.u8iugwyv 7kthe point on the orbit farthest from the sun) to perihelion (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 follow c6 u,yn;ha bkw.ajs:s32vh :20-0se ys kdmmjbircular 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 orbital period of the star of mass M is T. Which one of the following choicebd0hke 32 m6svyw:., ks -abnssjhjm0 ay:;2us 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 invl xp9/lyc8l 1 a circular orbit with speed vand orbital radius R around a heavy stationary mass. An external impulse is quickly appl 8vpl/x9l c1ylied 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 elliptical orbit is

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