Finding Symmetry

A semicircular ring of radius R R has a linear mass density λ = sin θ \lambda=\sin\theta , where θ \theta is the angle made by the radius vector with the positive X X axis. Assuming the origin of the coordinate system to be at the circular center of the ring, find the coordinates of its center of mass.

  • Assume R = 1 R= 1 m m
  • If the coordinates can be expressed in the form of ( x , y ) (x,y) , find x + y x+y to three decimal places.
  • Assume X X and Y Y axes in the conventional directions.


The answer is 0.785.

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