Find the Moment or Center of Mass of the Wire $x ^ { 2 } + y ^ { 2 } = 16$

Multiple Choice

Find the moment or center of mass of the wire, as indicated.
-Find the center of mass of a wire of constant density that lies along the first-quadrant portion of the circle $x ^ { 2 } + y ^ { 2 } = 16$

A) $\overline { \mathrm { x } } = \frac { 8 } { \pi } , \overline { \mathrm { y } } = \frac { 8 } { \pi }$
B) $\bar { x } = \frac { 4 } { \pi } , \bar { y } = \frac { 4 } { \pi }$
C) $\bar { x } = \frac { 12 } { \pi } , \bar { y } = \frac { 12 } { \pi }$
D) $\bar { x } = 0 , \bar { y } = \frac { 8 } { \pi }$