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 equal time” can bos 3zzm/1+wwb3da li5 e derived most directly s53ai3 z+ w1omb/ldz wfrom 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 d4/s+r 4gs w8l.io gxxthe Sun located at one focus of the ellipse.” This statement is l8r.w g /is dxg4+sx4obest 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 gravitatioakr 8y9:bs yw9nal attraction between two small objects if t ayr9kwsb:8 9yhe 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 with a gravitational forke2r4cl .cbmwtw, 4t s94kp-lce of 4.0 N. Wha c.r42,4 e- klt9tpm4cwsb klwt will 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, havev w cez-:vjd9xgw /v3en(s, o :oqx.1h the same uniform density. Planet X has twice the h j(-d. ,/ vn9:vo3wozgv1: swexxqceradius 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 uniform den-, t1miy ruuyu(rn6k(sity. Planet X has twice the radius of Planu6- y (k(iutuny,rrm 1et 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 orbited by a small satellxah lnvur(vj 2, br9 b9ehb;n;7o ;t2lite by setting the gravitational force on the satellite equal to the centripetal force on thejvreur x vb2n,9hh ;b29 ;loa7nblt;( 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 Glenn with a gravitational force F aq9 ;lif2/we5a nh0 ddyt the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn whilenf;5a/ h y0 qdwe92lid 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-Ea;ans eh5ku-xq8,o 6n8rv o/ ixrth system (ignore any influence of the Sun), which one of the following best expresses the magnitude of the Mok- /6 n8ex ir8, xa;o5osuhvnqon’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 from ttekg.8xzkhkh *p b3a7 k2,1hz1w p1t7d *vranhe earth with a cargo for the international space station, which of the following graphs would best represent the gravitational force ogek*7 t bp 1.hhx7t pk1zw*r2n 8adh k3,za1kvn 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 thj( hyuxg n.shi.xqk-vt924 );d exx b2e same gravitational force as a second object at the surface of the Earth. Which of the following would be a reasonable concluskni)4h2jq9u xx-v hy(b d. 2xtx;s.egion?

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 al+xq9*l cg5jy+unf6h weight, W, at the surface of the moon. If we assume the moon has a nearly unxg 6l qn9h+lf5+y j*cuiform 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:n 9o3krfe dy) /xrf:y Earth and twice the radius of Earth. The magnitude of the gravitational acceleration at the surface of this planet f:k:ye)nd9xor /fr 3yis 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 o. 5zgxdjv(1ot o1yp :+gxma mv-oi*+ vf Earth and a mass one-fifth the Eart jyg 1 z15t.+o(op :o*vvdxg-mm+xviah’s mass. 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 n0 l,hvm; +3f3gxwhac 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 Planefm0wal 3c3h gv n;h,+xt 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 qb+ v-h*aalsr *yv90lone-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 l0-ay9+hva *rlq b*vstake 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 satellivmu ic.7l u9/ctes, 1 and 2, are put into circular orbit at the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of satellite 17 muuic cv/l.9. 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 withmg26 s v9rv,z 7ufw fvbq)9,ss 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 problq: pk43jy+ 2;v2.rjngpi 1y cke+lhzqem, the word “weight” refers to the force a scale registers. If the Earth were to sto+r3qk.42zjkl h y+ qpcg2:ve1n;y pi jp 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 ellip1 hjp2 woo;wc9tical orbit around the sun. As the comet moves from aphelion (the point on the orbit farthest from thecwop2 hj 9o1w; 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 sta.jx04wjyee t-7k51b4bk i m*jw02jfbku a 4ler system shown, 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 represents the total mass of the binaryulexjkkj5bem00e taf21iy 4.b*bj-j 4 w w7k4 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*dj c6 bb)iw8c orbital radius 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. Ici6db)wb8*j c n terms of R, the size of the semi-major axis a of this new elliptical orbit is

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