For water it's temperature `50^(@) C` and room temperature is `30 ^(@) C`, just after 5 minute excess temperature reduce to its half value, calculate temperature of water next 2.5 minute.

The temperature of a body falls from 30^(@)C to 20^(@)C in 5 minutes. The temperature of the air is 13^(@)C . Find the temperature of the body after another 5 minutes.

Water at 100^(@) C cools in 10 minutes to 88^(@)C in a room temperature of 25^(@)C .Find the temperature of water after 20 minutes.

A body cools from 70^(@)C to 50^(@)C in 5minutes Temperature of surroundings is 20^(@)C Its temperature after next 10 minutes is .

If water of mass 60 g and temperature 50^(@)C is mixed with water of mass 40g and temperature 30^(@)C , what will be the maximum temperature of the mixture ?

If water of mass 80g and temperature 45^(@)C is mixed with water of mass 20g and temperature 30^(@)C , what will be maximum temperature of the mixture?

Initially, a beaker has 100 g of water at temperature 90^(@)C . Later another 600g of water at temperature 20^(@)C was poured into the beaker. The temperature, T of the water ("in ".^(@)C) after mixing is

Does a body at 20^(@)C radiate in a room, where the room temperature is 30^(@)C ? If yes, why does its temperature not fall further?

A student heats some amount of tap water in a calorimeter to a temperature of nearly 50^(@)C above the room temperature. He then records the temperature of this water as it is cooling down at regular intervals of 2 minutes each. He tabulates his observations as follows: {:("Time"("in minutes")rarr,0,2,4,6,8,10),("Temperature"("in".^(@)C)rarr,t_(1),t_(2),t_(3),t_(4),t_(5),t_(6)):} He is likely to observe that:

Mass m of a liquid A is kept in a cup and it is at a temperature of 90^(@)C . When placed in a room having temperature of 20^(@)C , it takes 5 min for the temperature of the liquid to drop to 30^(@)C . Another liquid B has nearly same density as that of A and its sample of mass m kept in another identical cup at 50^(@)C takes 5 min for its temperature to fall to 30^(@)C when placed in room having temperature 20^(@)C . If the two liquids at 90^(@)C and 50^(@)C are mixed in a calorimeter where no heat is allowed to leak, find the final temperature of the mixture. Assume that Newton’s law of cooling is applicable for given temperature ranges.

When water of mass 70g and temperature 50^(@)C is added to water of mass 30g, the maximum temperature of the mixutre is found to be 41^(@)C . Find the temperature of water of mass 30g before hot water was added to it.