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Your roommate is working on his bicycle and has the bike upside down. He spins the 68.0cm -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?

  • math -

    speed=distance/time=PI*68cm/.3333sec

    acceleration= speed^2/radius

    of course, radius is still half diameter.

  • math -

    2-5

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