The disk in a computer hard drive spins at 7200 rpm (Figure P8.3). At the radius of 30 m...

The disk in a computer hard drive spins at 7200 rpm (Figure P8.3). At the radius of 30 mm, a stream of data is magnetically written on the disk, and the spacing between data bits is 25 ??m. Determine the number of bits per second that pass by the read/write head.