physics
posted by Sandhya .
A wheel of radius 0.5 m rotates with a constant angular speed about an axis perpendicular to its
center. A point on the wheel that is 0.2 m from the center has a tangential speed of 2 m/s.
(a) Determine the tangential speed of a point 0.4 m from the center of the wheel.
(b) Determine the tangential acceleration of the point that is 0.2 m from the center.

Use the .5m radius to calculate the moment of inertia. Use the radius of .4 (or on b of .2) to find tangential speed (w*r)

What is the role of Moment of inertia here?
Am I right if I say that the tangential speed is the same 2 m/s & the tangential acceleration zero ? 
You are correct. moment of inertia is not in the picture, acceleration tangential is zero. Good point.
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