Can anyone tell me how to set up the equation to find out how far it is around the Earth at the Equator? Tomorow I have to mail off a PHS 111 lab that is due, so any immediate help anyone could offer would be greatly appreciated. THANKS!!!!!!!!
Can anyone tell me how to set up the equation to find out how far it is around the Earth at the Equator? Tomorow I have to mail off a PHS 111 lab that is due, so any immediate help anyone could offer would be greatly appreciated. THANKS!!!!!!!!
we would need to know the radius of the earth. was that given to you?
when you find the radius use the following formula for the circumference:
$\displaystyle \mbox { Circumference } = 2 \pi r$, where $\displaystyle r$ is the radius
According to google, the radius of the Earth is 6378.1 km
So, $\displaystyle \mbox { Circumference } = 2 (6378.1) \pi = 12756.2 \pi \approx 40074.78 \mbox { km} $
Hello,
you can use another method:
If you know the distance between 2 points on a circle of longitude or the equator then you can calculate the circumference by:
d : difference of degrees
D: distance between the 2 points in km
then
$\displaystyle c = \frac{360^\circ}{d} \cdot D$
Example:
First point on the equator at 10°W
Second Point on the equator at 16° W
Distance 667.9 km
$\displaystyle c = \frac{360^\circ}{6^\circ} \cdot 667.9\ km = 40074 \ km$