bbuoyancy

Meta centre

It is defined as the point about which a floating body start oscillating when the body is titled by a small axis

Meta centric height

Distance between the meta centre of a floating body and the centre of gravity

Stability of a submerged body.

1. Stable equilibrium: When W=Fb and point B is above G.

2. Unstable equilibrium: When W=Fb but centre if buoyancy is below G

3. Neutral equilibrium:. When W=Fb and B and G are at the same point

Stability of a floating body(determined by M and G)

1. Stable equilibrium: When M is above G.

2. Unstable equilibrium: When M is below G.

3. Neutral equilibrium: If point M is at the centre of gravity of the body

Meta centric height formula and position of centre of gravity

When is B and G coincide

When a body is fully submerged, uniform and symmetrical

A large metacentric height improves

Stability and makes the periodic time of oscillation shorter

The centre of buoyancy in a submerged body remains

Unchanged

Hydraulic accumulator is used for

Supplying energy when main supply fails

One torr of pressure is equivalent to

1_mm of mercury or 1/760atm

Barometer is used to measure

Atmospheric pressure

A micro manometer with inclined tube is called

Sensitive manometer used for accurate measurement

Hydraulic press is a dwvice used to

Lift larger load by the application of a comparatively much smaller force

Mercury is used in barometer because

1. Its vapour pressure is low that it can be ngelected

2. The height of barometer will be less

Velocity is measured by

Pitot tube

When is perfect vacuum obtained

When both absolute pressure and molecular momentum are zero

Diagram for u tube manometer guage and vacuum

Piezometer measures the guage pressure of only

Incompressible fluids

Pressure head of a fluid represents

Energy per unit weight