Planet Definition and 821 Threads

Find U, the gravitational potential energy of the object at a distance R from the center of the planet, with the gravitational potential energy taken to be zero when the object is infinitely far away from the planet. Express your answer in terms of R, m, M, and G, the universal gravitational...

mass of a planet? I need some real good, and quick help. How do you find the mass of a planet with this information? The planet has a satellite 5.2 times 10 to the eighth meters away, and it takes 33 days to circle the planet. Help.

When looking in the sky, how would you determine if your seeing a planet or a star? Thanks.

A strange new planet that has no atmosphere has a satellite that orbits very close to the planet's surface with a period of 1.50 hours. What is the approximate density of the planet? (Assume that the radius of orbit equals the radius of the planet.)

Help with this: I don't know how to not use the mass or radius of Earth. Determine what your weight would be on a planet that had twice times the mass of the Earth and three times Earth's radius. (there is a was to figure this our without knowing the radius or the mass of the Earth.)

Space probe, planet, and sun... Correcting test again, and I don't know where to start on this problem: A space prob lies along a line between a planet and the sun so that the sun's gravitational pull on the probe balances the planets pull. The distance of the probe from the planet is 1.0...

What is it meant by: mr(1)V(1)= mr(2)v(2) The quantity mrv is called the angular momentum of the planet. Is angular momentum of the planet conserved? What do they mean conserved?? Thanks and sorry such short notice... my physics teacher soooo nicely gave us 2 days notice to finish all...

We know that the Earth is precessing. http://www.crystalinks.com/precession.html We also know that the Earth has a fluid outer core and a solid inner core. How would the core(s) react on that precession movement?

There had been announcements over the past few years about the 'discovery' of water on planets or moons which were allegedly frozen (including reports of frozen lakes) on which the planet had no atmosphere. Have I been missing some force, they mythical force, which keeps said bodies of water...

The Life of a planet is in it's atmosphere. Where have all the Dinosaurs gone? Did they succumb to a deadly plague? Were they frozen to death as a result of a massive meteor strike? OR were they eaten by colonizing Martians? The simple answer is: Probably Not! Here's why. The primordial...

can't delete this thread... a drawing that has proved to be nonsense...sorry

Just an observation that may open some discussion on just how fragile the Earth's condition is. When we look at the changes in seasons from winter to summer we know that this is caused by the angle of axis of the planet as it orbits the sun ( am I correct in say ing this). So in summer for...

I recently read an interesting theory by Issac Asimov. Here is a link to a summery of the article, including the equation mentioned below... http://www.jmp.com/news/jmpercable/fall97/just_mooning_around.html Asimov calculates a ratio of the force a planet (primary) is exerting over the force...

http://space.com/spacewatch/where_is_mars.html

http://space.com/spacewatch/where_is_mars.html

Is this really true, maybe in NY but not as a whole, anybody got any government figures on this? Maybe we can find the most lazy place on the planet, then I am emigrating :)

Why does physicist only talk about gravity collpase on stars? Doesn't gravity collapse happen to planets? I mean they do not have any process such as nuclear fusion do repell gravity.

http://www.msnbc.com/news/937147.asp Check this out. This Jupiter-sized planet is practically as old as the universe. Go figure.

Okay, so I am staying in the holiday inn express this past week, and there is a sign in my room next to the clean white towels stating in bold letters: SAVE OUR PLANET the sign ultimately is asking for the hotel guest to not use excess towels because it hurts our planet to wash unused...

[SOLVED] Treasure Planet! Did you like it or hate it? My daughter loves it and I love the song "Im still Here!" got it free at kazaa.:wink: Later ppls Dx :wink:

I have always had a fascination of Pluto, is it labeled as a lost satellite of Neptune, or a planet on it's own because of Charon?