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a copper cylinder 1.50 m long and 40.0 cm in diameter stands on one end.what is the mass of the cylinder?

You will need to look up the density of copper. Call it p. It is about 8.94 g/cm^3
The mass is pi*r^2*L*p
L and r should be in cm to get the mass in grams. r = 20.0 cm; L =[ 150 cm.
The mass will not depend upon whether it is standing on an end or the side
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