Day 28-Oct 16-worksheetDiploma-Bouyancy cont.& kinematics intro.

In passenger ships, the metacentric height is kept —

• High to increase stability

• Low to improve comfort

• Zero for neutral equilibrium

• Negative for rolling effect

If the metacentric height (GM) of a warship is increased, then its —

• Stability decreases

• Comfort increases

• Period of oscillation decreases

• Rolling reduces but comfort increases

For a floating body, when a small angular displacement is given, the point about which it oscillates is called —

• Centre of gravity

• Centre of buoyancy

• Metacentre

• Neutral point

A uniform body 3 m × 2 m × 1 m floats in water with immersion depth 0.6 m. Find its weight.

(a)  

A rectangular barge 20 m × 5 m floats 1.5 m immersed. If CG is 1.8 m from bottom, find GM.

(a)  

How can relatively denser object be made to float on the less dense fluid?

• By altering the shape.

• By altering the forces acting on the object

• By altering the shear forces acting on the object

• None

Submarines use principle of ‘neutral buoyancy’ to go into the water.

• True

• False

The time period of oscillation of a floating body is given by (a)   .

As metacentric height increases, time period _____ and stability _____ .

(a)  

The metacentric height (GM) is the distance between _____ and _____ .

(a)