Quote:
Originally Posted by Stuck686  3) assume the earth orbits the sun once per year (365 days), in a circular way with sun at the center, also earth is 93,000,000 miles from the sun. what is the linear speed of the earth in miles per hour?? |
Speed = distance/time
what is the distance the earth has to travel? Well, that's just the circumference of its circular path of orbit, and what's that?
C = 2pi*r = 2pi*93000000 = 186000000pi miles.
what is the time it takes?
Didn't you read the question! It takes 365 days
I know that silly, but we need time in hours!
Fine! Don't shout at me! The time in hours is:
365*24 = 8760 hours
Thus, speed = 186000000pi miles/8760 hour = 21232.88pi mph