Heat TransferHard
Question
A cup of tea cools from 80oC to 60oC in one minute. The ambient temperature is 30oC. In cooling from 60oC to 50oC. It will take :
Options
A.50 sec.
B.90 sec
C.60 sec.
D.48 sec.
More Heat Transfer Questions
The υm − T curve for a perfect black body is −...A solid cube and sphere are made of same substance and both have same surface area. If the temperature of both bodies 12...A black body is at temperature of 500 K, it emits energy at a rate which is proportional to :...The condition under which a microwave oven heats up a food item containing water molecules most efficiently is :-...The temperature of a perfect black body is 727oC and its area is 0.1 m2. If stefan′s constant = 5.67 × 10-8 w...