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Density (kg/m3) = mass(kg)/volume(m3)= 0.386/20x10-3 = 19.333333....kg/m3
Mass = sg * volume = 0.82 * 50 kg = 41 kg
About 48 newtons or 10.8lbs
Neither!!! They both have the same mass at 1 kg. However, the feathers will occupy a greater volume.
density= mass/volume (mass divided by volume) mass is usually in grams(g) or kilograms(kg) volume is in meters cubed or m3 so density would be either g/m3 or kg/m3