A spherical weather balloon os filled with hydrogen until, Physics

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A spherical weather balloon os filled with hydrogen until

A spherical weather balloon os filled with Hydrogen until itsradius is 3m. Total mass including instruments is 15kg.

a) Find buoyant force acting on the balloon, assuming thedensity of air 1.29 kg/m^3

b) What is the net force acting on the balloon and instrumentsafter it is released from the ground.

c) Why does the balloon's radius increase as it rises?

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Physics: A spherical weather balloon os filled with hydrogen until

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