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An ice hockey puck is in the shape of a cylinder with a radius of 38 mm, and a thickness of of 35mm. It has a density of 1.5 g/cm3. FInd the mass.

 Sep 12, 2018
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radius = 38 mm --> 3.8 cm
thickness = 35 mm --> 3.5 cm

volume = πr²h
volume = π(3.8 cm)²(3.5 cm)
volume = 50.54 cm³

density = 1.5 g/cm³

 

density = mass / volume
1.5 g/cm³ = mass / 50.54 cm³ [multiply 50.54 cm³ on both sides]
75.81 g = mass [cm³ cancels out]

 Sep 12, 2018

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