bigbywolfe Posted June 25, 2013 Report Share Posted June 25, 2013 Does anyone have a simple way to determine Orbital Velocity? It doesn't need to be exact, just a decent estimate. It's one of the things listed with every planet in Star Hero, yet it's one of the few things the book doesn't have a instructions to figure out (unless I'm just missing it). Quote Link to comment Share on other sites More sharing options...
Hyper-Man Posted June 25, 2013 Report Share Posted June 25, 2013 http://en.wikipedia.org/wiki/Orbital_speed http://formulas.tutorvista.com/physi...y-formula.html Where G is gravitational constant, M is the mass of the body at center, R is radius of orbit. Orbital Velocity Formula is used to find the orbital velocity or orbital speed of the any planet if mass M and radius R are known. It is expressed in meter per second (m/s). Quote Link to comment Share on other sites More sharing options...
bigbywolfe Posted June 25, 2013 Author Report Share Posted June 25, 2013 Thanks. I had found that, but I don't have a calculator that can handle G. Thought there might be a way to approximate it. Quote Link to comment Share on other sites More sharing options...
Xavier Onassiss Posted June 25, 2013 Report Share Posted June 25, 2013 Thanks. I had found that' date=' but I don't have a calculator that can handle G. Thought there might be a way to approximate it.[/quote'] If you're using a computer with windows, the Calculator accessory should be be able to handle it. (or come close) Quote Link to comment Share on other sites More sharing options...
bigbywolfe Posted June 25, 2013 Author Report Share Posted June 25, 2013 You're probably right. I guess I'm just having issues getting this: into the calculator. I'm still trying. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted June 25, 2013 Report Share Posted June 25, 2013 Calculate the velocity for an orbit equal to Earth's surface (that's something like 8 km/second, I think). Then, to calculate a velocity for any orbit for any planet, just multiply that velocity with the square root of (planet's mass in Earth masses divided by orbit's radius in Earth radii). Quote Link to comment Share on other sites More sharing options...
Old Man Posted June 25, 2013 Report Share Posted June 25, 2013 You're probably right. I guess I'm just having issues getting this: into the calculator. I'm still trying. You don't have to put all the units into your calculator, just the 6.7x10^-11. As long as you make sure masses are in (many) kilos and distances are in (many) meters, the velocity will come out in meters per second. I don't even know what that (80) is in there, that makes no sense. Quote Link to comment Share on other sites More sharing options...
Old Man Posted June 25, 2013 Report Share Posted June 25, 2013 You're probably right. I guess I'm just having issues getting this: into the calculator. I'm still trying. Or, go to wolframalpha.com and type in 'orbital velocity 100km'. You'll be able to play with the numbers in the ensuing page. Quote Link to comment Share on other sites More sharing options...
bigbywolfe Posted June 25, 2013 Author Report Share Posted June 25, 2013 Thanks everyone. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted June 25, 2013 Report Share Posted June 25, 2013 You're probably right. I guess I'm just having issues getting this: into the calculator. I'm still trying. Can wolframalpha.com handle other planets? At work, ATM. Quote Link to comment Share on other sites More sharing options...
The Weapon Posted August 11, 2013 Report Share Posted August 11, 2013 Calculate the velocity for an orbit equal to Earth's surface (that's something like 8 km/second, I think). Then, to calculate a velocity for any orbit for any planet, just multiply that velocity with the square root of (planet's mass in Earth masses divided by orbit's radius in Earth radii).Easier way, take the moon's orbital as a radius (384,399km), and it's velocity 1.022 km/s. Multiply by Square root (object being orbited mass in Earth Masses divided by orbit's radius in moon orbit radii). Easier to find the figures. Quote Link to comment Share on other sites More sharing options...
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