A circular brass plate has the following dimensions:
Diameter; 6' 5"
Thickness; 4"
5 4" holes
Determine weight.
Brass weighs .3 lbs. / cu. in.
The plate is a cylinder.
Volume = Pi * r^ 2 * h
3.1416 * 38.5 * 38.5 * 4 = 18626.54 in^3 (gross vol.).
3.1416 * 2 * 2 * 4 = 50.26 in.^3 (vol. of 1 hole).
50.26 * 5 = 251.328 in.^3 (vol. of 5 holes).
18626.54 - 251.328 = 18375.21 in.^3 (net vol.)
18375.21 * .3 = 5512.56 = 5513 lbs.
Which steps are correct ?