True centrifugal casting is performed horizontally to make copper tube sections. the tubes have a length = 1.0 m, diameter = 0.25 m, and wall thickness = 15 mm. a.) if the rotational speed of the pipe = 700 rev/min, determine the g-factor on the molten metal. b.) is the rotational speed sufficient to avoid "rain"? c.) what volume of molten metal must be poured into the mold to make the casting if solidification shrinkage and solid thermal contraction for copper are = 4.5% and 7.5%, respectively (both are volumetric contractions).