Question 1006184: In 2005 a planet was found revolving about a distant sunlike star in 3.88 days. The radius of its orbit is 1700000 km. What is its linear velocity (in km/h) about its star?
The linear velocity is 115000 km/h, how do you get that?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Assume a circular orbit.
the radius is 1.7X10^6 km
the circumference is 2*pi*r=10.676 * 10^6 km.
It goes around the star in 3.88 days, which is 24*3.88 =93.12 hours
divide 10.676^10^6 km by 9.312 *10^1 hours (or 10676000 by 93.12)
114,646 km/h or 115,000 km/h
The radius gives you the circumference, and you divide the circumference in km by time in hours and get speed in km/h.
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