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 ehohk ug9m64f+ -t1fywqual time” can be derived most directly from+4 1uf-go fktwyhh6m9 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 ellipticsx*;if ysd/5 oal orbits with the Sun located at one focus of the ellipse.” Thox */iydss5;fis 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 betwee(g*r. yq i dph xn)1 ugn7f3e9et:vxp(n two small objects if v 3(en )p1xtid pgy r7q.:gheu( *9fnxthe mass 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 other wiizqsgfutt27d 79k 7c ;th a gravitational force of 4.0 N. What will be the force if the distance 779fqs cid72 ktgtz;ubetween 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 planjsuk qa)451 g,: hzcweets, X andY, have the same uniform density. Planet X has twice tcqa ,gwu)sk41hz 5ej: he 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 an q:q: l0y;z tgrmp )p1 +q)-iokqg.poad Y, have the same uniform density. Planet X has tw :10gk+ )p ql)ra.iqm:o ygz-opp;q tqice 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 calculated if it is or4g* qfi4kl 6e mqxvqc5(2o5m tbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite. Whichqx 442okml ce i*65 fqt5(vqmg 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 gravitatimr5caz3inhc zf*i 8 */onal force F at the surface of the Earth. When he made his famous second fligh c8c5/*ma* zr3f hnizit 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 anfjpzy/.ih-u)fp n y6qd 48pn*y influence of the Sun), which one of the following best expresses the magnitude of the Moon’s acceleration about the Ear8df 6y p yjpn.4 q-zf*upi/nh)th?

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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 the internatiovfqxhvo31rmt06eqb x)g/q8f: d w: *f nal space station, which of the following graphs would best represent the gravitational force on the cargo versus distance from the surface of the Eabefd*0r::qg fv3x f6txohq vq8/m1) wrth?

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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 theb) ikpxn9v63q surface of the Moon experiences the same gravitational force asx v9in6q b)3kp a 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 a weight, W, at the su6r e9xs w90cvldwuc jjs i.rzj,7c-(/ rface 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 Mie,w s6 cjv juz/dc-rj(s .l07rxw99coon’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 o mmo hb1:-0i0 oz0 )aoz3l6l;khlnq ktwice the radius of Earth. The magnitude of the gravitational acceleration at the surface hk-lm l3z0 )k0om6no1ol :b;0hqozai 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 mask rvgoencg4) y; jetlm+ )y:h:n8n(/rs one-fifth the Earth’s mass. The gravitational acceleration at the surface gjo h)gvyr ):8e;:( rnynk+t l/4encm 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 ci10a/ i*4 ts 2iykqk6re qmwr9orcular orbit with a constant speed of 5,000m/s. Thea2mwsq q0k6yr1i e/i 9o r4k*t radius of 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 orbitt6m4kse/bj *t+.uelzw7-c xn)c l6bm s a star with mass one-half 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 t/emtsxwl-+*t6b j n4bc c)kl.uemz6 7he 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 ci-t01olm;;vc2rv)279zv ofdmsa u:2xe hok qc rcular orbit at the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of satell:- m mo;fzco1kvv9r70ds;lex22cuoq)2ta hvite 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 aruio1+-o mogtxjsen1o )442(vae8.fk yig;s dound 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 proble8i+9xmf kq 8dqm, the word “weight” refers to the force a scale registers. kdiq88x +mf9q 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 elliptical9 0ikn6fh,r s w:k jcvh2fuw/0+s3u:gffuk 2 h 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 clo+ uc 6gsusfw:vk2hf:30 ,9w0hif/ n rhkkj2ufsest 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 circular ocm)tsrwr/.4z xa7 .jerbits about the system’s center of mass. The stars are swc . )esr7rj.tma 4/zxeparated 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 rakivn0qw.08oxc q /o/ 2ysjg *sdius R around a heavy stationary maqxi/0.oq kwjv0sog 2snc y8/* ss. 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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