How much does a wrecking ball weigh 6 ft diameter made of steel

Answer 1

I guess you are using English units so
density of steel = .291 pounds/ in^3 or 509 pound/ft^3
Radius = R = 6/2 = 3 ft
volume = (4/3) pi r^3 = 4 pi *9 = 36 pi = 113 ft^3
509 * 113 = weight in pounds (heavy)