150g of water and an equal volume of another liquid of mass 200 g are cooled in turn in the same calorimeter of mass 80 g and specific heat 400 J/(kg K), stirred, from 50°C to 30°C. Water takes 4 min

Question

150g of water and an equal volume of another liquid of mass 200 g are cooled in turn in the same calorimeter of mass 80 g and specific heat 400 J/(kg K), stirred, from 50°C to 30°C. Water takes 4 min and the liquid 3 min. Surroundings are at 30°C or below and the cooling conditions are identical. Find the specific heat of the liquid in J/(kg K). Choose the correct value.

TestHub · Accepted Answer

Equal loss rate gives equal t C ​ . Water case: 0.15 ( 4200 ) + 0.08 ( 400 ) = 662 J / K over 240 s. Liquid: 0.2 c + 32 over 180 s : 0.2 c + 32 = 662 ( 240 180 ​ ) = 496.5 , so c = 2322.5 J / ( kg K ) . Option C.

Physics - Heat & Thermo Question with Solution | TestHub

Options:

Doubts & Discussion