In a surrounding medium of temperature `10^(@)"C"`, a body takes 7 min for a fall of temperature from `60^(@)"C to 40"^(@)"C"`. In what time the temperature of the body will fall from `40^(@)"C to 28"^(@)"C"`

When a body is placed in surroundings at a constant temperature of 20^(@)C and heated by a 10W heater, its temperature remains constant at 40^(@)C . If the temperature of the body is now raised from 20^(@)C to 80^(@)C in 5 min at a uniform rate, the total heat it will lose to the surroundings will be

A body cools in 10 min from 60^(@) C to 40^(@) C and to 42.5^(@) C in 7.5 min. Find the temperature of the surroundings.

A body cools in 10 minutes from 60^(@)C to 40^(@)C . What is the temperature of the body after next 20 minutes? The temperatuer fo surroundings is 10^(@)C

A body cools in 10 minutes from 60^(@)C to 40^(@)C . What is the temperature of the body after next 20 minutes? The temperatuer fo surroundings is 10^(@)C

A body takes 5 minutes to cool from 90^(@)C to 60^(@)C . If the temperature of the surroundings is 20^(@)C , the time taken by it to cool from 60^(@)C to 30^(@)C will be.

A body takes 4 min. to cool from 61^(@)C to 59^(@)C . If the temperature of the surroundings is 30^(@)C , the time taken by the body to cool from 51^(@)C to 49^(@)C is :

A body at temperature 40^(@)C is kept in a surrounding of constant temperature 20^(@)C . It is observed that its temperature falls to 35^(@)C in 10 minutes. Find how much more time will it taken for the body to attain a temperature of 30^(@)C .

A body cools from 50^(@)C to 49.9^(@)C in 5 s. the temperature of the surroundings is 30^(@)C . How long will the body, take to cool from 40^(@)C to 39.9^(@)C ?

A body cools from 50^(@)C to 46^(@)C in 5 min and to 40^(@)C in the next 10 min. then the temperature of the surrounding is