How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
A
1.38 x 106 J
B
2.53x104J
C
7.66x103J
D
1.38x103J
E
1.27 X103J
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Q = mcΔθ = 0.050 x 460 x (85 - 25) = 1.38x103J
Source: Myschool Past Questions Archive (Record #24098)