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The weight of the rock in air is 0.91N. When it is completely submerged in water,...

The weight of the rock in air is 0.91N. When it is completely submerged in water, its weight is
0.52N. What is the buoyant force acting on the rock when it is completely submerged in the
water and what is the displaced water volume?
b. How adjust a ship volume and weight in order to float in certain level?

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