9:40 AM .oooo AT&T; 98% session masteringphysics.com C Problem 6.5 A CD-ROM driv

Question

9:40 AM .oooo AT&T; 98% session masteringphysics.com C Problem 6.5 A CD-ROM drive in a computer spins the 12 em diameter disks at 7800 rpm. Part A What is a disk's period (ins)? Express your answer to two significant figures and include the appropriate units. My Answers Give Up Part B What is a disk's frequency (in rev/s? Express your answer to two significant figures and include the appropriate units. Give Up Part C What would be the speed of a speck of dust on the outside edge of this disk? Express your answer to two significant figures and include the appropriate units. 7,536 Submit My Answers Give Up incorrect. Try Again: 4 attempts remaining Part D What is the acceleration in units of that this speck of dust experiences? Express your swer using two significant figures. Submit My Answers Give up

Explanation / Answer

radius r = 6 cm = 0.06 m

angular speed = w = 7800 rpm = 7800*(2pi/60) = 816.84 rad/s

A)

time period T = 2pi/w = (2pi/816.84) = 7.7*10^-3 s

B)

f = 1/T = 1.3*10^2 Hz

C)

v = r*w = 49 m/s

D)

a = v^2*g/rg = 4083.33 g

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