Question

A body of mass 400g is whirled in a vertical of radius 2m at a steady rate of 2rev/s.find it's centripetal force

Answer 1

4 pi radians/s = omega
Ac = R omega^2
Ac = 2 (16 pi^2) = 32 pi^3
m Ac =0.400 * 32 * pi^2 Newtons