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First, you need to know the mass of brass:
Brass, Specific Gravity 8.56 lb per Cubic Foot (from wikianswers)
second: you need to know the length and radius of the rod.
formula: divide the radius of the rod by two
square the answer you get (multiply it by itself)
multiply by pi
You have now calculate the area of the rod's end.
multiply the answer by the length of the rod and you get the volume of the rod
finally, multiply the answer by the specific gravity for brass.
The answer is the weight of the brass rod
NOTE: make sure you use the same units for length and mass throughout the formula. In the above example you will have to know the radius and length in feet to yield the weight in lbs. If you want to know the answer in a different unit (ounces for example) you will have to convert the specific gravity to correct units.
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∙ 13y ago
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