178) A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

179) A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

180) The velocity of jet of water travelling out of opening in a tank filled with water is proportional to

181) In a free vortex motion, the radial component of velocity everywhere is

182) In a forced vortex, the velocity of flow everywhere within the fluid is