Calorimetry

1 of water at its boiling point absorbs 540 cal of heat to become steam with a volume of 1671 . If the atmospheric pressure and the mechanical equivalent of heat , the energy spent in this process in overcoming intermolecular forces is

2 L water heated from to , power = 160 J/s. Find time.

Which process does not occur through convection?

Two rods (one semi-circular and other straight) of same material and cross-section are joined. The ratio of heat transferred through semi-circular rod to straight rod is graphics[width=0.45\linewidth]{PHYSICS/QP21.png}

Liquid is filled in a flask. On heating, what happens to liquid level?