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# A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then (a) t1 - t2 = t3 (b) t1 < t2 < t3 (c) t1 > t2 > t3 (d) t1 < t2 > t3

Priyanka motiani
27 Points
4 years ago
T1-T2/time = k ( T1+T2/2 - T(surronding)) now put the values of temp and time. Keep time and tsurr as it is in the form of variable only we have 3 different time so we get 3 eq. .5/t1 = k (135/2- Tsu) ,5/t2 = k (125/2-Tsu), .5/t3 =k (115/2 -Tsu) divide two eq at a time the you get a idea about t1, t2 and t3 so you get option b ... hope it helps
ankit singh
one year ago
A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in T1 minutes, from 70°C to 65°C in T_2 minutes and from 65°C to 60°C in T_3 minutes.

ankit singh