A solid substance having a temperature of `90^@C` is kept in a beaker. Some water having temperature of `60^@C` is then poured into the beaker. After sometime, the temperature of the water will be
A body having a temperature of 27^@C is kept in a room having a temperature of 27^@C . Does the body emit any radiation in this case when the room temperature is the same as body temperature ?
Initially , a bearker has 100 g of water at temperature 90^@C Later another 600 g of water at temperatures 20^@C was poured into the beaker. The temperature ,T of the water after mixing is
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
One litre of water at 30^@C is mixed with one litre of water at 60^@C , the temperature of the mixture will be
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.
For a heat engine the temperature of the source is 127^(@)C .To have 60% efficiency the temperature of the sink is
A beaker contains 40 g of water at 20^@C . Now 50 g of ice is put into the beaker. The resulting temperature will be
