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” cana g 35whi bs/9g6ppq, +h0hujk be derived most directly from which conservatu, wq0 3 a bphk5h+/sp6gji9hgion 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 Suq3w(il9z cn4s 2)2pq .gyqlain located at one focus of the ellipse.” This statement anpgq q9ci2y z l.2i(lw 3q4)sis 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 betwee4y3rdr0r ni2x n two small objecirr04ydn3 2r xts if the 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 )sv6x*i)anv peach other with a gravitational force of 4.0 N. What will be the force if the )vs6np)ivx* adistance 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-r 7gf4egkvj-*c otating planets, X andY, have the same uniform density. Planet X has twice the radius of Planet Y. Lec4g g7j-*kfev t $g_x$ 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, ha 50l retzbw6j5ve the same uniform density. Planet X ha6rlwb5jez t 05s 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 calculated if it is orbited bt0n.qj;.f( kpdac mne1d h;5sxs,h y (y a small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite.d h.k snnped,h (s5f0a tcjx;qy(1m.; 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 ; a*g*u(0qp cbna5aptEarth attracts John Glenn with a gravitational force F at the surface of the Earth. When he made his famous sec*0p q( ;atpu5g*aba ncond 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 influenc hy8j.o cyxc i;esc.09e of the Sun), which one of the0ec c .s9hcy8y .ox;ji following best expresses 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 from z 8.9ba-plw.ahhtr4 n:sq u c.the earth with a cargo for the international.lrhuw.:-p 8aan 4hq9z t c.bs space station, 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 experiences the same grn rh, s1 jw7h-w7wr)km91pbpi avitational force as a second object at the surface of the Earth. Which of the following wou 9r )wh1w pr hnm7sp1jw7b,k-ild 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 w39rxi;l q ft w,od*5drs8vac)eight, 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 Mtqxdw;) 5os 93vrfar*,i c8ld oon’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 twice the wh.hg );q c3ybradius of Earth. The magnitude of the gravitational accelerationh.w; bq)ygch3 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 mass one6bi(*pt. -zwsg o1ola-fifth the Earth’s mas.ogb-it6l(1 * azw poss. 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 ieafop9t2( 5l an a circular orbit with a constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the magni9etaalof(2 5p tude 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 plane6 ka;(hk / 0h j9qjhhuixj7)cat orbits 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 the p 9h)ujx/qci ;kha h70jh6kj(alanet 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,r v7 vpw o,;-s8)xd)v fxr8gum are put into circular orbit at the same altitude aborrs8 8dvpv7g-w; ) ,uxvxof)m ve Earth’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 9p6a8ol5rf; nwz(b td orbit around 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 p:yi(y :d1a ;xhx izw-ylk1;ttroblem, the word “weight” refers to the force a scale registers. If the Earth were to stop rotating, but not chah;x ild;::kw ya-1y x(t1tyzinge 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 move2xc99mwf5 ff )m*o .siq; cixzs from aphelion (the point sx.)o*2cz5immq 99 fi cf;xwfon 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 st6:xy /e0lcstaey:./bc b5q xi ar 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 bi x:i.y lc a/ecx /ebbs5yq:0t6nary 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 zf0,,k-p2etgbght 5 oa circular orbit with speed vand orbital radius R around a heavy stationary mass. An external impulse is quickly applied to the rocket directly opposite5g2e0 gp th,-,bt zfok 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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