Physics
posted by JAYZ .
Four point masses are arranged on the xy plane as follows.
Mass1 = 47.0 grams at x = 2.00 cm and y = 2.00 cm.
Mass2 = 55.0 grams at x = 0.00 cm and y = 4.00 cm.
Mass3 = 27.0 grams at x = 3.00 cm and y = 3.00 cm.
Mass4 = 45.0 grams at x = 1.00 cm and y = 2.00 cm.
What is the rotational inertia if this collection of masses is rotating about the x axis?

wouldn't it be the sum of the masses at their y locations...
Itotal= 1/2 m1(y1)^2+ 1/2 m2(y2)^2+ .. 
thank you very much!, really appreciate it!