m at .77 c
beta = .77
sqrt (1 - beta^2 )= sqrt(.4071) = .638
so
m' = 1/.638 = 1.57 kg
(1/2)m' v^2 = 4.19*10^16 Joules
How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?
1 answer
1 answer