//(Brakes) Example 12.1
//Diameter of the disk D (m)
D = 1
//Thickness of the disk t (m)
t = 0.2
//Speed of the flywheel n1 (rpm)
n1 = 350
//Time required to bring the disk to rest ts (s)
ts = 1.5
//Mass density of the disk rho (kg/m3)
rho = 7200
//Final angular speed of the disk w2 (rad/s)
w2 = 0