Astronomy Group at eNotes http://www.enotes.com/astronomy/group The latest discussion, including questions and answers, from the Astronomy Group at eNotes. Sat, 12 Dec 2009 09:19:48 en-us <![CDATA[The equation governing the satellite speed, derived from the Newton...]]> http://www.enotes.com/astronomy/q-and-a/satellite-has-twice-mass-satellite-b-rotates-same-123379 http://www.enotes.com/astronomy/q-and-a/satellite-has-twice-mass-satellite-b-rotates-same-123379 Sat, 12 Dec 2009 09:19:48 PST <![CDATA[By Keplar's third law, the  plannets  are moving around the sun in an...]]> http://www.enotes.com/astronomy/q-and-a/let-average-orbital-radius-planet-r-let-orbital-123383 http://www.enotes.com/astronomy/q-and-a/let-average-orbital-radius-planet-r-let-orbital-123383 Sat, 12 Dec 2009 08:42:17 PST <![CDATA[Let the average orbital radius of a planet be R. Let the orbital period...]]> http://www.enotes.com/astronomy/q-and-a/let-average-orbital-radius-planet-r-let-orbital-123383 http://www.enotes.com/astronomy/q-and-a/let-average-orbital-radius-planet-r-let-orbital-123383 Sat, 12 Dec 2009 08:27:14 PST <![CDATA[Satellite A has twice the mass of satellite B, and rotates in the same...]]> http://www.enotes.com/astronomy/q-and-a/satellite-has-twice-mass-satellite-b-rotates-same-123379 http://www.enotes.com/astronomy/q-and-a/satellite-has-twice-mass-satellite-b-rotates-same-123379 Sat, 12 Dec 2009 08:11:36 PST <![CDATA[All the statements are wrong, and at best create confusion. Each of the...]]> http://www.enotes.com/astronomy/q-and-a/when-considering-only-sun-earth-mercury-mars-121881 http://www.enotes.com/astronomy/q-and-a/when-considering-only-sun-earth-mercury-mars-121881 Mon, 7 Dec 2009 07:33:47 PST <![CDATA[a) Let the altitude of the satellite be h and the radius of the earth be...]]> http://www.enotes.com/astronomy/q-and-a/given-g-6-67259-x-10-11-n-times-m-2-kg-2-satellite-121883 http://www.enotes.com/astronomy/q-and-a/given-g-6-67259-x-10-11-n-times-m-2-kg-2-satellite-121883 Mon, 7 Dec 2009 07:09:24 PST <![CDATA[By Newton's law of gravitation, the force ,F of attraction between ...]]> http://www.enotes.com/astronomy/q-and-a/mars-has-mass-about-6-39-x-10-23-kg-its-moon-121887 http://www.enotes.com/astronomy/q-and-a/mars-has-mass-about-6-39-x-10-23-kg-its-moon-121887 Mon, 7 Dec 2009 05:57:01 PST <![CDATA[Mars has a mass of about 6.39 x 10^23 kg, and its moon Phobos has a mass...]]> http://www.enotes.com/astronomy/q-and-a/mars-has-mass-about-6-39-x-10-23-kg-its-moon-121887 http://www.enotes.com/astronomy/q-and-a/mars-has-mass-about-6-39-x-10-23-kg-its-moon-121887 Mon, 7 Dec 2009 05:15:02 PST <![CDATA[Given: G=6.67259 x 10^-11 N times m^2/kg^2 A satellite moves in a...]]> http://www.enotes.com/astronomy/q-and-a/given-g-6-67259-x-10-11-n-times-m-2-kg-2-satellite-121883 http://www.enotes.com/astronomy/q-and-a/given-g-6-67259-x-10-11-n-times-m-2-kg-2-satellite-121883 Mon, 7 Dec 2009 04:43:12 PST <![CDATA[When considering only the Sun,Earth,Mercury, and Mars in a planetary...]]> http://www.enotes.com/astronomy/q-and-a/when-considering-only-sun-earth-mercury-mars-121881 http://www.enotes.com/astronomy/q-and-a/when-considering-only-sun-earth-mercury-mars-121881 Mon, 7 Dec 2009 04:39:27 PST <![CDATA[The moon phases occur on a rather regular cycle.  Because the months...]]> http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 Sat, 5 Dec 2009 06:54:03 PST <![CDATA[The Dark Rift in the Milky Way galaxy is what runs down the middle of...]]> http://www.enotes.com/astronomy/q-and-a/whats-dark-rift-milky-way-what-does-have-do-with-121285 http://www.enotes.com/astronomy/q-and-a/whats-dark-rift-milky-way-what-does-have-do-with-121285 Sat, 5 Dec 2009 00:27:17 PST <![CDATA[The most recent Blue Moon will take place on December 31, 2009. Some...]]> http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 Fri, 4 Dec 2009 23:32:58 PST <![CDATA[Why is this December (2009) a Blue Moon month?  How often is there a...]]> http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 http://www.enotes.com/astronomy/q-and-a/why-this-december-2009-blue-moon-month-how-often-121335 Fri, 4 Dec 2009 19:49:04 PST <![CDATA[What's the Dark Rift in the Milky Way?  What does it have to do with...]]> http://www.enotes.com/astronomy/q-and-a/whats-dark-rift-milky-way-what-does-have-do-with-121285 http://www.enotes.com/astronomy/q-and-a/whats-dark-rift-milky-way-what-does-have-do-with-121285 Fri, 4 Dec 2009 11:31:39 PST <![CDATA[The current travels through any conductor at a speed which is same that...]]> http://www.enotes.com/astronomy/q-and-a/switch-light-next-each-other-connected-by-wire-119637 http://www.enotes.com/astronomy/q-and-a/switch-light-next-each-other-connected-by-wire-119637 Sun, 29 Nov 2009 00:43:18 PST <![CDATA[A switch and light next to each other are connected by a wire going...]]> http://www.enotes.com/astronomy/q-and-a/switch-light-next-each-other-connected-by-wire-119637 http://www.enotes.com/astronomy/q-and-a/switch-light-next-each-other-connected-by-wire-119637 Sat, 28 Nov 2009 23:28:10 PST <![CDATA[We can assume that the altitude of the satellite is x from earth and so...]]> http://www.enotes.com/astronomy/q-and-a/satellite-moves-circular-orbit-around-earth-speed-118633 http://www.enotes.com/astronomy/q-and-a/satellite-moves-circular-orbit-around-earth-speed-118633 Tue, 24 Nov 2009 09:29:20 PST <![CDATA[We use the the relation of law of universal gravitational law of Newton...]]> http://www.enotes.com/astronomy/q-and-a/during-solar-eclipse-moon-mass-7-36x10-22kg-earth-118641 http://www.enotes.com/astronomy/q-and-a/during-solar-eclipse-moon-mass-7-36x10-22kg-earth-118641 Tue, 24 Nov 2009 09:09:49 PST <![CDATA[The force exerted by the moon on the Earth is 2.98 x 10^31 joules. The...]]> http://www.enotes.com/astronomy/q-and-a/during-solar-eclipse-moon-mass-7-36x10-22kg-earth-118641 http://www.enotes.com/astronomy/q-and-a/during-solar-eclipse-moon-mass-7-36x10-22kg-earth-118641 Tue, 24 Nov 2009 07:28:53 PST