physics
posted by amy .
A DVD is spinning at 180 rpm’s. Calculate its angular acceleration when it increases to 240 rpms’s in 2 seconds. (Remember, convert rpm’s to radians/second)

Vo = 180rev/min * 6.28rad/rev * (1/60)min/s = 18.84rad/s.
Vf = 240/180 * 18.84 = 25.12rad/s.
a = (VfVo)/t = 25.12  18.84) / 2 = 3.14rad/s^2.