F = mass x acceleration due to gravity
Fc = m x ac
ac = ar = 4.3 x 107ms−2, m = 3.6 x 10−6kg
Fc = m x ac = 3.6 x 10−6 x 4.3 x 107 = 154.8N ≈ 155N ⇒ 1.55 x 102N
