How much faster does a cup of coffee cool off from `100^(@)C` than from `30^(@)C`? Assume the coffee to act as a black body and temp. of surrounding = `20^(@)C`.

Compare the rate of loss of heat by one degree from a cup of hot coffee when it is at 100^@C and at 40^@C , in a room at 10^@C . Consider the coffee to act as a black body.

A body cools from 80^(@)C to 50^(@)C in 5 min-utes Calculate the time it takes to cool from 60^(@)C to 30^(@)C The temperature of the surroundings is 20^(@)C .

A body cools from 80^(@)C to 50^(@)C in 5 min-utes Calculate the time it takes to cool from 60^(@)C to 30^(@)C The temperature of the surroundings is 20^(@)C .

How much heat energy will be given off in cooling water of 2.5 kg from 85^(@)C" to "35^(@)C ?

A body cools from 80^(@)C to 70^(@)C in 10 minutes Find the required further fir it to cool from 70^(@)C to 60^(@)C Assume the temperature of the surrounding to be 30^(@)C .

A body cools from 40^@C to 30^@C in 5 minutes and to 26^@C in next 3 minutes. What will be the temperature of surroundings?