You have a beach ball which has a radius of 19 cm and a mass of 0.2 kg. You have

Question

You have a beach ball which has a radius of 19 cm and a mass of 0.2 kg. You have a lead ball which has the same radius but has a mass of 100 kg. A. You immerse the beach ball under the water. What is the buoyancy force felt by the beach ball in newtons? B. To keep the beach ball stationary under the water what is the force you need to apply in newtons? (UP is positive) C. You immerse the lead ball under the water, what is the buoyancy force felt by the lead ball in newtons? D. To keep the lead ball stationary under the water what is the force you need to apply in newtons? (UP is positive)

Explanation / Answer

buoyancy in case of peach ball = pi* r^2 * density of water(1g/cm^3=1000 kg/m^3) * g = 1357.7N force needed to keep it immersed = 1357.7- (.5 * 9.8) =1352 N (downward) similar approach for lead ball too.

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