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  # science
  
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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