Density = Mass/Volume, correct. However, with a cylinder, you have to find the volume. In order to find the volume of a cylinder use the equation PiR2 * H where "R" is the radius (Diameter/2) squared.
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The density of an any material/object is given by p=m/V The volume of a cylinder is V= πr2h So the density of a cylinder is therefore: p=m/πr2h Where: m is mass, r is radius and h is the height of the cylinder.
you do some multiplication
Yes, provided you know the density of the substance and the substance can be adequately measured by the cylinder. Because density is the quotient of the mass and volume, the mass is the product of the density and volume. So if you multiply the density and volume (assuming the units match), you will find the mass.
That all depends on the type of gas and volume given for the problem. We can't determine the mass and density of the gas cylinder if we are not given these info, which can also include pressure (because density varies based on that variable).
A solid cylinder 1m in diameter and 0.8m high is of uniform relative density 0.85. Calculate the periodic time of small oscillations when cylinder floats with its axis vertical in still water