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Applied Mechanics - Engineering

Q1:

The distance of the c.g. of a semi-circular arc of radius r from its diameter along the radius of symmetry, is

A

B

C

D

ANS:D -

Both semicircle (4r/3π) and semicircular arc (2r/π) are 2D the difference is that arc is basically a hollow semicircle it is like a wire making half perimeter of the circle only.