You walk into class and see several plastic hemispheres floating like boats in tanks of tap (fresh) water. Each person is tasked with placing the heaviest rock into a boat without sinking it. You get one try, and each person gets points based on how much of the hemisphere is submerged. The hemispheres have a mass of 21 g and a diameter of 8 cm. What mass rock do you place in the hemisphere to win?

Answer :

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