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(a) Calculate the buoyant force of air (density 1.20kg/m^3) on a spherical party balloon that has a radius of 15cm.

(b) If the rubber of the balloon itself has a mass of 2.00 g and the balloon is filled with helium (density .166 kg/m^3), calculate the net upward force (the "lift") that acts on it in air.

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