Problem: A thin rectangular plate of uniform density is 2.81 kg/m2 has a length a = 32.1 cm and a width b = 21 cm. The lower left corner is located at the origin. There is a hole in the plate with centre at (12 cm, 9 cm) and radius r = 4.80 cm.
Part A: Calculate the mass of the object?
Part B: Calculate the x coordinate of the object's centre of mass?
Part C: Calculate the distance of the centre of mass from the origin?
Having trouble with this physics problem, can you please explain with the answer.