lenovo blemC 89379787 HW AC Chapter 4 tem 12 A speck of dust on a spinning DVD h

Question

lenovo blemC 89379787 HW AC Chapter 4 tem 12 A speck of dust on a spinning DVD has a cemtlipetal acceleration Part A What is the acceleration of a different speck of dust that is twice as far from the center of the disk? Express your answer to two significant figures and include the appropriate units a 40 x Incorrect Try Again; 5 atbempts remaining Whut would be the acceltion of the Erst speck of dust if the dek's angular velocity was doubled Express your answer to two significant figures and include the appropriate units O Ask me anything

Explanation / Answer

1. Centripetal acceleration = v^2/r

= 20 m/sec^2

Now, R = 2r

So, acceleration = v^2/4r = 20/4 = 5 m/sec^2

2. Acceleration = w^2 x r

New W = 2 x w

Acceleration = 4 w^2 x r = 4 x 20 = 80 rad/sec^2

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