5. numerical problem An aeroplane takes 30 min. to travel from Biratnagar to Kathmandu. If
the air distance between the Biratnagar and Kathmandu in 450km. Find
the average velocity of plane.
(Ans: 25m/s

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?