The platter of the hard drive of a computer rotates at 7100rpm = revolutions per

Question

The platter of the hard drive of a computer rotates at 7100rpm = revolutions per minute = rev/min).

Part A

What is the angular velocity (rad/s) of the platter? (Express your answer using three significant figures.)

Part B

If the reading head of the drive is located 3.00 cm from the rotation axis, what is the linear speed of the point on the platter just below it? (Express your answer to three significant figures and include the appropriate units. )

Part C

If a single bit requires 0.50 ?m of length along the direction of motion, how many bits per second can the writing head write when it is 3.00 cm from the axis?

Explanation / Answer

Part A)

7100 rev/sec

The conversion to rad/s...7100 X (2pi/60)

743.5 rad/s

Part B)

v = rw

v = (.03)(743.5)

v = 22.3 m/s

Part C)

22.3/(.5 X 10-6)

4.46 X 107 bits/sec

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