Chapter 12 - Worked Solutions
to selected extension questions from the OUP text Senior Physics -
Concepts in Context by Walding,
Rapkins and Rossiter
Q36.
The area of the walls = 2x (4 x 2.5) + 2 x (3.5 x 2.5) = 37.5 m2
rate of heat loss R = k(T2 - T1)/d
= 0.8 (25 - 15) 37.5/0.2 = 1500 W
E = P x t = 1500 W x 30 x 60 s = 2.7 x 106 J.
Return
to Physics Text Home Page