1. The problem statement, all variables and given/known data (a) What is the tangential acceleration of a bug on the rim of a 78 rpm record 10 in. in diameter if the record moves from rest to its final angular velocity in 3 s? (b) When the record is at its final speed, what is the tangential velocity of the bug? Its tangential acceleration? Its radial acceleration? 2. Relevant equations ω = ωo + [itex]\alpha[/itex]t 3. The attempt at a solution I have solved everything in the problem accept the second and third part of (b). I managed to calculate the tangential velocity of the bug just fine. The way I read this question is that once it hits 78 rpm it stops accelerating and that becomes the final velocity. This would cause the tangential acceleration in part (b) to be zero which my book agrees with. The third part of (b) I don't understand though. The book says that the radial acceleration at that point would be 8.39 m/s. If the tangential acceleration is zero, how could there be a radial acceleration and how would I calculate it?