Your roommate is working on his bicycle and has the bike upside down. He

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spins the 64.0 -diameter wheel, and y? Your roommate is working on his bicycle and has the bike upside down. He spins the 64.0 -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second.
What is the pebble's speed? What is the pebble's acceleration?
 
r = d/2 = 32 cm = 0.32 m
one rev = 2 * pi * r = 2.01m
v = 2.01m * 3s = 6.03 m/s
a = v^2 / r = 113.6 m/s^2
 
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