Suppose you discover your grandfather's collection of Caruso records from the early part of the century. These disks played at 78.0 revolutions/minute (rpm) and were 9.00in. in diameter.

Question

What was the radial acceleration of a point on the rim of such a record as you listened to the great tenor singing?

Answer 1

a=rω²
&omega=angular velocity in rad/s
r=radius, in m
a=acceleration in m/s²

Answer 2

7.63