Question

A fly wheel of mass 12.5 kg and diameter 0.36 m rotating at 90 rpm has its speed increased to 720 rpm in 8s. Find the torque applied to flywheel.

Answer 1

ω₁ = 2πf₁ = 3π rad/sec

ω₂ = 2πf₂ = 24 π rad/sec 

α = ω₂ – ω₁/ t = 8.243 rad/s² 

τ = 1α = (Mr² / 2) α 

τ = 1.669 Nm