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 outv33*mvlh v/da( dz )ioue) - ;vmak0br equal areas in equal time” can be derived most directly from which cons-3;oau mdm(k 3d 0b lvv)aze*v)ivh/ rervation 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 sol2qe:z2globv6h3lail i2 d- 5sar system follow elliptical orbits with the Sun located at ond 2gvlh- sbale6l2zo5iiq3 2 :e focus of the ellipse.” 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/:zyc6 rgzbr94 s-zxm the force of gravitational attraction between two small objectsz c/:rz6 4r xb-9zymgs 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 bodj15 k3bu71wk3bw jvz6e:ejtoies attract each other with a gravitational force of 4.0 N. What will be the force if the distance between them is doubled?bv 3bek tzju1wo jjk:1w6e7 35

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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 a7mzrgrtw 7xr 0/+ f;sendY, have the same uniform density. Planet X has twice the radius of Planet Yx/+ zref07rmswt rg7;. 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-rotatin 1+ hhzc:xdh(vhev0 t7g planets, X and Y, have the same uniform density. Planet Xxeh cz :7ht1hvv dh+(0 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 calculated if it is orbited by a srhnnjpf32pm) l d9+)ur8 .iymmall satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite.) li rmdnur93pfnp82)h +j .ym 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 fcklxl96k 3kgb78 rsxr4 /ho-aorce F at the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn while he was ic4ra o6bx8s7l kx- /k3g lk9hrn 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 influeim5vl80h9j r wnce of the Sun), which one of the following best expresses the magnitude of the Moonl5wv rhm9ji80’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 the earth wi 3gjzl.wg6 :sdth a cargo for the international space station, which of the f6g.gj3dw : slzollowing 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 Mtqpkk: g8-6i sk nul.*oon experiences the same gravitational force as a second object at the surface of the Earth. Which of th6pt*kil : .n8 sgkkuq-e 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 cc0 /+zif9ha dmass, m, and 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 an9zi+0 cc/fahd d 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 Earth a /fdij)1 utd5gz8 ii:*naj,zz8jra:gnd twice the radius of Earth. The magnitude of the gravitational acceleration at the surface of this plaja)i gz8/*j nit au5rfg:dij z zd8,1:net 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 thay dsq/9xihy f0 -er9hob t0u-4t of Earth and a mass one-fifth the Earth’s mass. The gravitational ah/ qxyhy0eu0d--stfr9i bo94cceleration 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 cirua/:v vfqgi.m, da p7u8(v1jacular orbit with a constant speed of 5,000m/s.gipj,.8v/ ( a fvq7ma1 duuav: The 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 /p h a*5gw.fecplanet orbits a star with mass one-half the mass of our sun. The planet’s orbital radius is the same as the Efhpcea5/ gw. *arth’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 circul .obotb;lf xc33:9*et acl m2ewu 4a0aar orbit at the same altitude above Earth’s surface. The mass of0c*bo tlx u2mca3;4: we ob f.ela39at 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 yak; o-h+qyl0radius $r_1= R$. 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 problem, the word “weight” refers to they upfg86fie rr3puq:-3- 1nd o force a scale registers. If the Earth wer d -i3u1fr: ger-fn puyqo6p83e 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 orbit around the sun. As the comet moves 1g i8d spab,c:l:h xm*from aphelion (the point on the orbit farthest from the sun) to perihelion (the pdp 8xs*cilha ,1:g:m boint 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, tc:)l714 sp.lr zxftcr he two stars follow circular orbits about the system’s center of mass. Ts)l:.prcxl7z 1f4 ctrhe 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 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 orbit4h, :9n s+igiv(tkwi n with speed vand orbital radius R around a heavy stationary mass. An external imp4i( w+intvg,isk h9n: ulse 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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