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

1#

08.19: Kepler’s Second2 rgx/ dwcwv j72qi: 3btl7lx*.+olyk Law about “sweeping out equal areas in equal time” can be derived most d 7l x3y+*d/lobr2vw .:2ji gxkqtlwc7irectly 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 orbi k 9.8ap)jk+p h tyw2lw pchg3rn x0wf.6(hz-rts with the Sun located at one focus of the ellipse.” This statement is best summarized by which one of the following chzr0-yt (w) p9gwh+w2jhflap .r hx8k knp3. c6oices?

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 graviiw -y md o5p2wx2vn:y2tational attraction between two small objects if the i- pmyo522y v:n2xdwwmass of each object 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 otherz) kgoesm(jk2:hx/bkc3hd (1 with a gravitational force of 4.0 N. What will be the force if the distancgo1b2 z hs:(/(kedmhkc3x)kj e 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 ao: j-ugg,pll/ 19u-a*ywkmf nfq2*xendY, have the same uniform density. Planet X has twic - f**g,an9polm egu/f1yu:w2jkx-lq e 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 plf:,ai7xx h bj.anets, X and Y, have the same uniform density. Pixfj xa7h,: b.lanet X has 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 planet can be calculaxo0.*d mlzeu :ted if it is orbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal force :zd.*0mxe oul 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 the5fjm7;qpnzy z. d1 4op Earth attracts John Glenn with a gravitational force F at the surface of the Earth. When he made his famous second flight in orbit, the gravitational forqjnp.py d5 z4f;zo 7m1ce 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 (s w;moe)s*sc ,ignore any influence of the Sun), which one of the following best exprsc *sw)o ;,semesses 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 fc1w0, /j kl6;8wdo:a2twozrrxk2r b y rom the earth with a cargo for the international space stat:1 28y zrw/lba,rwx krcdo ;ktoj20w6ion, which of the following graphs would best represent 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 the Moon exper( cdmx; 5fp105cgjcfpiences the same gravitational force as a seconp x01j;g5mc 5(pdfcf cd 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 hasrp 4oxbac2g )1 a mass, m, and a weight, W, at the surface of the moon. If we assume the moon1xr2gb4)op a c 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 masyh z t)gu7gzfrs08 s.u2wr4- xs of Earth and twice the radius of Earth. The magnitude of thezgush2xr40s ygf8 )7zt.u-wr 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 maswz;eb ) ga* 1*eiazea6s one-fifth the Earth’s mass. The gravitational acceleration at tw1)e bae *g;6z *aeiazhe 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 dq lj w;5 lfp:ji.s1obcr c-e:rd,o; 4X in a circular orbit with a constant 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 P -bslf dc5r.jp1e;i,cj w loqod r:;:4lanet 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 tre) n 1:n xzxwa: hmjj+x:,rz 9x7*bnche mass of our sun. The plaarjn9,h*r: 1e+:xxwz ) mzj 7nc:xbxnnet’s 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 put into circular orbit at thhe-dbc30qj g 0e same altitude above e b j3-qc00ghdEarth’s surface. The 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 circular orbit around the Earth with a radiuzxj4: *lfvjeyo5*l o+s $r_1= R$. 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 followinp 2st0/7aqn t9ca,a4 k*,zemn) lpdavg problem, the word “weight” refers to the force a scale registers. If the Earth were tov p/7sd,4zat*nacqe,l 0 n k9mpta) 2a 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 arou7; vgehl+wo 7snd the sun. As the comet moves from aphelion w;o v+h77lsge (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 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 shotj/cevw r55b 6wn, the two stars follow 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 orbital period of the star of mass M is T. Which one of the following choices rep/5rc jvew5t6 bresents 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 wh vj5mldw.s*- ajj -1vand orbital radius R around a wja* .d-m- jlv1sw5hj 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 elliptical orbit is

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