A satellite is in an elliptical orbit around the earth with aphelion of 6R and perihelion of 2R where R = 6400 KM is the radius of the earth. Find the eccentricity of the orbit.

A satellite is in an elliptical orbit around the earth with aphelion o

1.	A satellite is in an elliptical orbit around the earth with aphelion of 6R and perihelion of 2R where R = 6400 KM is the radius of the earth. Find the eccentricity of the orbit.
Answer» Solution :We KNOW that Perigee `(r_p) = a(1-e) = 2R...(1)`, APOGEE `(r_a) = a(1 +e) = 6R `..... (2) Solving (1) and (2)`RARR ` we get eccentricity (e) `=1/2`