Tangential component of linear acceleration of point on flywheel

[Hollywood]

What is the magnitude of the tangential component of the linear acceleration of a particle that is located at a distance of 50 cm from the axis of rotation when the flywheel is turning at 78.0 rev/min?

I took 78 rev/min and converted it to rad/s and got 4.08 rad/s. I then multiplied that by .5m to get my answer. Am I doing this right?

Second part: What is the magnitude of the net linear acceleration of the particle in the above question?

I don't know how I should solve this problem.

 

[Phlogistonian]

You're calculating velocity. The question is asking for acceleration.