Q.3:- Explain why
(a) Two bodies at different temperatures T1 and T2 if brought in thermal contact do not necessarily settle to the mean temperature (T1 + T2)/2.
(b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.
(c) Air pressure in a car tyre increases during driving.
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude.
(a) In thermal contact, heat flows from the body at higher temprature to the body at lower temprature till tempratures becomes equal. The final temprature can be the mean temprature (T1 + T2)/2only when thermal capicities of the two bodies are equal.
(b) This is bcause heat absorbed by a substance is directly proportional to the specific heat of the substance.
(c) During driving, the temprature of air inside the tyre increases due to moion. Accordingto Charle’s law, P ∝ T. Therefore, air pressure inside the tyre increases.
(d) This is because in a harbour town, the relative humidity is more than in a desert town. hence, the climate of a harbour town is without extremes of hot and cold.