- #1

rsyodoom2005

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**orbital speed of mars! help!?**

Mars is 230 million km from the sun. It completes one orbit in a period of approximately 687 days. Calculate the orbital speed of Mars in mph.

OK so gave me the formula which 2*pi*r/ Period r= distance from the planet to the sun. and cirmumference = 2*pi* r

So i set it up 2*3.1416* 150E6 km /16488 hours (mars hours)

= 57161.57 km/hr then convert to mph 57161.57km hour/1.60km =35725.98 mph