Question

A flywheel has moment of inertia 4 kg-m² and has kinetic energy of 200 J. Calculate the number of revolutions is makes before coming to rest if a constant opposing couple of 5N-m is applied to the flywheel –

• A. 12.8 rev
• B. 24 rev
• C. 6.4 rev
• D. 16 rev

Answer 1

Answer: (C)

6.4 rev

Answer 2

W = DKE or

t(q) = $\frac{1}{2}$Iw²

t(2pn) = $\frac{1}{2}$Iw²