Centripetal Acceleration ===> Physics helppp.. =)?

[Mavic C]

Mike Harris stands at the very top of the sky dome stadium roof to pitch the opening ball for the Blue Jays game. He slips a bit left to centre and slides down along the frictionless roof surface. For what distance, measured along the curve, will he slide before leaving the roof? Assume the roff has a circular cross section of radius 125m.

[idiot]

You may need to derive or get some more information. r is given. Is the sky dome moving at all, and at what rate of rotation? There is no force indicated to create circular motion or centripital force.