A body at a temperature of `50^0F` is placed outdoors where the temperature is `100^0F` . If the rate of change of the temperature of a body is proportional to the temperature difference between the body and its surrounding medium. If after 5 min the temperature of the body is `60^0F` , find (a) how long it will take the body to reach a temperature of 75 `^0` F and (b) the temperature of the body after 20 min.

A body at a temperature of 50^(@) F is placed outdoors where the temperature is 100^(@) F. If the rate of change of the temperature of a body is proportional to the temperature differenece between the body and its surrounding medium. If after 5 min the temperature of the body is 60^(@) F, find (a) how long will take the body to reach a temperature of 75^(@) F and (b) the temperature of the body after 20 min.

Derive Newton's law of cooling to show that the rate of loss of heat from the body is proportional to the temperature difference between the body and its surroundings.

For a small temperature difference between the body and the surroundings, the relation between the rate of heat loss R and the temperature of the body is depicted by

For a small temperature difference between the body and the surroundings the relation between the rate of loss heat R and the temperature of the body is depicted by

The rate of fall of temperature of a body is difrectly proportional to the excess temperature of the body over the surroundings, (for small temperature difference). This is ________

What is (a) the normal body temperature of cow ? (b) the normal body temperature of buffalo ?

As difference of temperature of body and surroundings increases, rate of cooling

Newton’s law of cooling says that the rate of cooling of a body is proportional to the temperature difference between the body and its surrounding when the difference in temperature is small. (a) Will it be reasonable to assume that the rate of heating of a body is proportional to temperature difference between the surrounding and the body (for small difference in temperature) when the body is placed in a surrounding having higher temperature than the body? (b) Assuming that our assumption made in (a) is correct estimate the time required for a cup of cold coffee to gain temperature from 10^(@)C to 15^(@)C when it is kept in a room having temperature 25^(@)C . It was observed that the temperature of the cup increases from 5^(@)C to 10^(@)C in 4 min