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The weight is determined by the amount of metal contained in a one foot length of a 4 inch diameter round rod. To find the amount of the aluminum's weight by volume, do the following:
Find the cross-sectional area of the circle at the end of the round rod:
Radius (r) = diameter/2 = (4 inches)/2 = 2 inches
Area (A) = radius(squared) * PI = (2)^2 * 3.14159 = 12.566 square inches
Multiply by the length of the rod:
Volume (V) = Area * Length = 12.566 sq.in. * 12 inches = 150.8 cubic inches
According to the page at
What_is_the_weight_of_one_cubic_inch_of_6061_aluminum
, the weight of one cubic inch of 6061 alluminum alloy is .0975 lb. So multiply the volume of the round rod in cubic inches by this weight:
Total weight (W) = 150.8 cubic inches * .0975 lb. = 14.7 lb. (Answer!)
If you happen to have had an Aluminum bar that was rectangular instead of round, the area would be instead calculated as A= width * height, and all subsequent calculations afterwards would remain the same.
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r this question....
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