What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?
A. 0.01 ?gH/8
B. 4?g/3
C. 0.01 ?gH/4
D. 0.04 ?gH/3
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