Find the Center of Mass Of $D = \left\{ ( x , y ) \mid x ^ { 2 } + y ^ { 2 } \leq 4 , x \geq 0 , y \geq 0 \right\}$

Short Answer

Find the center of mass of $D = \left\{ ( x , y ) \mid x ^ { 2 } + y ^ { 2 } \leq 4 , x \geq 0 , y \geq 0 \right\}$ if $p ( x , y ) = \sqrt { x ^ { 2 } + y ^ { 2 } }$ .