What is the volume of a hula hoop?

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Presentation transcript:

What is the volume of a hula hoop? 11mm 2mm 16mm

Outer cylinder: V = πr2h V = π x 82 x 11 V = 704π V = 2212 mm3

Inner cylinder: V = πr2h V = π x 62 x 11 V = 396π V = 1244 mm3

Hula Hoop V = Outer V – Inner V V = 968 mm3 ( = 0.968 cm3)

Can you calculate the density of a Hula Hoop? Average pack contents: 32 hula hoops Average pack weight: 25g Vhulahoop = 0.968 cm3 Water has a density of 1g/cm3, so this means hula hoops should float. Weight of a single hula hoop: 25/32 = 0.781g Density = weight / volume: 0.781/0.968 = 0.807g/cm3