Question

tap supplies water at 20 degree centigrade and another tap at 80 degree centigrade than the amount of the hot water that should be mixed with cold water to get 36 litres of water at 45 degree centigrade

Answer 1

Explanation:

Given tap supplies water at 20 degree centigrade and another tap at 80 degree centigrade than the amount of the hot water that should be mixed with cold water to get 36 litres of water at 45 degree centigrade

• We need to find the amount of hot water to be mixed.
• Let the hot water be h, so the amount of cold water will be 36 – h.
• So 36 – h litre of cold water is taken.
• So if 36 litres and 36 – h litre is mixed we and the resultant temperature is 45 degree C.
• We need to apply principle of calorimeter.
• So heat released is equal to heat absorbed.
• So h x 1 x 35 = (36 – h) x 1 x 25       (45 -20 = 25 and specific heat = 1)
•   So 7h = 5 x (36 – h)
•        7h = 180 – 5h
•      12 h = 180
•       Or h = 15 litres
• So the amount of hot water to be mixed is 15 litres.

Reference link will be

https://brainly.in/question/3408340