Calculate the buoyant force (in Newtons) on an object that displaces 100 cm^3 of

Question

Calculate the buoyant force (in Newtons) on an object that displaces 100 cm^3 of water when submerged.

Calculate the force (in Newtons) exerted by a pressure of 1 Pa acting on a surface area of 10 cm^2.



If the temperature of a blackbody radiator (e.g., a lightbulb or star) doubles, how many times will the power radiated increase?


Calculate the intensity of sound in db for a sound with an intensity of of 1x10^-11 watts per square meters. The threshold of hearing is 1x10^-12 watts per square meters

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Explanation / Answer

(a)

volume V = 100 cm^3 = 10^-4 m^3

Buoyant force F = Vg

                        = 10^-4 * 1000 * 9.8

                        = 0.98 N

(b)

Pressure P = 1 Pa

Area A = 10 cm^2 = 10^-3 m^2

Force F = P A = 1 * 10^-3 = 10^-3 N

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