The diameter of a flywheel is 1 m. It has a mass of 20 kg. It is rotating about its axis with a speed of 120 rotations in one minute. Its angular momentum in kg m s' is

The diameter of a flywheel is 1 m. It has a mass of 20 kg. It is rotat

1.	The diameter of a flywheel is 1 m. It has a mass of 20 kg. It is rotating about its axis with a speed of 120 rotations in one minute. Its angular momentum in kg m s' is
Answer» `13.4` `31.4` `41.4` `43.4` SOLUTION :Here `d= 1 m EPSILON = 120` rpm , M = 20 kg `r = (d)/(2) = (1)/(2) m = 0.5` m `omega = 2 pi epsilon = (2PI XX 120)/(60) = 4pi rad s^(-1)` `THEREFORE L = I omega = (Mr^(2))/(2) omega = (20 xx (0.5)^(2) xx 4pi)/(2)` `=10 xx 0.25 xx 4 xx 3.14 = 31.4 kg m^(2) s^(-1)`