Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4500 kg), which is made of steel (ρ = 7800 kg/m3). In typical comic-book fashion, they decide to raise the yacht by filling it with ping-pong balls. A ping- pong ball has a mass of 2.7 g and a volume of 3.35 • 10-5 m3.
a) What is the buoyant force on one ping-pong ball in water?
b) How many balls are required to float the ship?
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