Acomputer hard drive has a disc that rotates at 10,000 rpm. the reader head is positioned 0.0005 in. above the disc’s surface. estimate the shear force on the reader head due to the air between the disc and head.

shearing force is

Explanation:

we know that

force can be determined

Area can be determine as

linear velocity can be determines as

dynamic viscosity of air

veolcity of disc

U = 174.5 ft/s

so

shearing force is

answer is c

explanation:

answer; equivalent to a one(1) horsepower motor;