A fan blade is rotating with a constant angular acceleration of +12.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?

Question

I do not know how to start this.

Answer 1

ε= 12.4 rad/s²,
a(tang) =9.8 m/s²
a(tang) = ε•R.

R = a(tang)/ ε = 9.8/12.4 = 0.79 m