A body is heated to `110^(@)C` and placed in air at ` 10^(@)C`. After 1 hour its temperature is `60^(@)C` . How much additional time is required for it to cool to `35^(@)C ` ?

A body cools from 60^(@)C to 50^(@)C in 10 minutes when kept in air at 30^(@)C . In the next 10 minut es its temperature will be

A body cools from 100^(@)C to 70^(@)C in 8 minutes. If the room temperature is 15^(@)C and assuming newton's law of cooling holds good, then time required for the body to cool from 70^(@)C to 40^(@)C is

A body cools at the rate of 3^(@)C// min when its temperature is 50^(@)C . If the temperature of surroundings is 25^(@)C then the rate of cooling of the body at 40^(@)C is

A metal sphere cools from 72^(@)C to 60^(@)C in 10 minutes. If the surroundings temperature is 36^(@)C , then the time taken by it to cool from 60^(@)C to 52^(@)C is

A body cools in a surrounding of constant temperature 30^(@)C . Its heat capacity is 2J//^(@)C . Initial temperature of the body is 40^(@)C . Assume Newton's law of cooling is valid. The body cools to 36^(@)C in 10 minutes. When the body temperature has reached 36^(@)C . it is heated again so that it reaches to 40^(@)C in 10 minutes. Assume that the rate of loss of heat at 38^(@)C is the average rate of loss for the given time . The total heat required from a heater by the body is :

A body cools in a surrounding of constant temperature 30^(@)C . Its heat capacity is 2J//^(@)C . Initial temperature of the body is 40^(@)C . Assume Newton's law of cooling is valid. The body cools to 36^(@)C in 10 minutes. When the body temperature has reached 36^(@)C . it is heated again so that it reaches to 40^(@)C in 10 minutes. Assume that the rate of loss of heat at 38^(@)C is the average rate of loss for the given time . The total heat required from a heater by the body is :

A body cools in a surrounding of constant temperature 30^(@)C . Its heat capacity is 2J//^(@)C . Initial temperature of the body is 40^(@)C . Assume Newton's law of cooling is valid. The body cools to 36^(@)C in 10 minutes. In further 10 minutes it will cool from 36^(@)C to :

A body cools in a surrounding of constant temperature 30^(@)C . Its heat capacity is 2J//^(@)C . Initial temperature of the body is 40^(@)C . Assume Newton's law of cooling is valid. The body cools to 36^(@)C in 10 minutes. In further 10 minutes it will cool from 36^(@)C to :