Thermal Propert...

A black body is heated from 27°C to 927°C. The ratio of radiation emitted will be

A bucket full of hot water is kept in a room. It cools from 75°C to 70°C in t₁ min, from 70°C to 65°C in t₂ min and from 65°C to 60°C in t₃ min. Then ,

The following four wires of length L and radius r are made of the same material. Which of these will have the largest extension when the same tension is applied?

The relation between Young’s modulus (Y), modulus of rigidity (η) and poisson’s ratio (σ) is

A wire of length L and of area of cross-section A is stretched through a certain length l. If Y is Young’s modulus of the material of the wire, then the force constant of the wire is

A uniformly tapering vessel shown in Fig., is filled with liquid of density 900 kg/m³. The force that acts on the base of the vessel due to liquid is (take g = 10 m/s²)

An open vessel containing water is given a constant acceleration a in the horizontal direction. Then the free surface of water gets sloped with the horizontal at an angle θ, given by

An ice block floats in a liquid whose density is less than water. A part of block is outside the liquid. When whole of ice has melted, the liquid level will

Fig. shows the vertical cross section of a vessel filled with a liquid of density ρ. The normal thrust per unit area on the walls of the vessel at point P, as shown will be

Surface tension of a liquid is due to