Tangential acceleration - unknown term

[LCattell]

Homework Statement

A man walks steadily outwards on a turntable (radius r) with radial velocity v. The turntable rotates with angular velocity w and angular acceleration alpha (anti-clockwise). What is the tangential component of acceleration?

Homework Equations

radial acceleration = -rw^2
tangential acceleration = r*alpha

The Attempt at a Solution

The answer given for the tangential acceleration is (r*alpha)+(2wv)
I understand the r*alpha bit, but could someone please enlighten me as to what the 2wv part refers to?

Thanks very much

LC

 

[LiorE]

Have you learned about Coriolis force?

 

[LCattell]

I thought that Coriolis was where an object appeared to deviate from its path. How is it related to this problem?