Pour a liter of 40°C water at into a liter of 20°C water and the final temperature of the two liters becomes

Question

Quizplus · Accepted Answer

This scenario involves mixing two volumes of water with different temperatures, and the final temperature will depend on the initial temperatures and volumes. The heat transfer between the two volumes follows the principle of thermal equilibrium, where the heat lost by the hotter water is gained by the cooler water until they reach the same temperature.

To find the final temperature, we can use the formula:
(m1 x T1 + m2 x T2) / (m1 + m2) = Tf
where m1 and m2 are the volumes of water (in liters), T1 and T2 are the initial temperatures (in Celsius), and Tf is the final temperature.

Plugging in the given values, we get:
(1 liter x 40°C + 1 liter x 20°C) / (1 liter + 1 liter) = 30°C

Therefore, the final temperature of the two liters becomes at or about 30°C, which corresponds to choice B.

Pour a Liter of 40°C Water at into a Liter