Fluid Mechanics
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.

0.04πgH/3
0.01πgH/4
4πg/3
0.01πgH/8

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Fluid Mechanics
Steady flow occurs, when the

Conditions change steadily with time
Rate of the velocity change is constant
Conditions are the same at the adjacent points at any instant
Conditions do not change with time at any point

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