- #1
anyaxo
- 3
- 0
I need to calculate the radial velocity of the sun. Every time I try using Newton's Laws of Gravitation, I end up getting a value of 0.733 m/s. Apparently the actual value is 220000 m/s.
Mass of Sun = 1.99 x 10^30 kg (3sf)
G = 6.67 x 10^-11 Nm^2kg^-2
r = distance of Sun from galactic centre = 8.0 kpc = 2.47 x 10^20 m
mv^2/r = -GMm/r^2
v^2 = GM/r
v^2 = (6.67 x 10^-11 (1.99 x 10^30))/(2.47 x 10^20)
= 0.537...
v = 0.733 m/s (3sf)
What am I doing wrong?! This is driving me insane.
Mass of Sun = 1.99 x 10^30 kg (3sf)
G = 6.67 x 10^-11 Nm^2kg^-2
r = distance of Sun from galactic centre = 8.0 kpc = 2.47 x 10^20 m
mv^2/r = -GMm/r^2
v^2 = GM/r
v^2 = (6.67 x 10^-11 (1.99 x 10^30))/(2.47 x 10^20)
= 0.537...
v = 0.733 m/s (3sf)
What am I doing wrong?! This is driving me insane.