Two square based pyramids are stacked on top of each other so that they form the classic egg timer what is the possible volume of sand this egg timer could hold if the base of each pyramid is 5cm by 5cm and the height of each pyramid is 7cm

Guest Jan 25, 2019

#1**+1 **

Volume of each pyramid is given by a^2 h/3 a = 5 h = 7

Volume = 25 * 7/3 = 58 1/3 cm^3 for EACH total volume would be = 2 x 58.33 = 116 2/3 cm^3

To use as a timer , you would likely only use the 58 1/3 cm^3 volume so the sand could trickle out of one and into the other pyramid.

ElectricPavlov Jan 25, 2019

#1**+1 **

Best Answer

Volume of each pyramid is given by a^2 h/3 a = 5 h = 7

Volume = 25 * 7/3 = 58 1/3 cm^3 for EACH total volume would be = 2 x 58.33 = 116 2/3 cm^3

To use as a timer , you would likely only use the 58 1/3 cm^3 volume so the sand could trickle out of one and into the other pyramid.

ElectricPavlov Jan 25, 2019