Posted: June 23rd, 2018

Estimate the change in entropy of the room | Physics

Estimate the change in entropy of the room | Physics

1. Suppose you make a cup of tea with boiling water straight from a kettle, nevertheless then the phone rings and also you is perhaps distracted so that you just solely uncover your cup of chilly tea later throughout the day.

(a) Estimate the change in entropy of the room by the cooling of the tea.

(b) Present that the change in entropy of the tea is mc ln(Tf / Ti) [This is a general expression for the change in entropy of any substance (with mass m and specific heat c) that is taken from an initial temperature Ti to a final temperature Tf. Hint: you need to do an integral.]

(c) Due to this fact uncover a numerical price for the change in entropy of the tea. [Neglect the specific heat of the cup (and the tea bag), and assume the room remains at a constant temperature.]

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