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Homework Statement
A hot (800 K) iron nail of mass 150 g is placed into a 1.0 kg of water at 25°C. What is the common temperature of the 2 objects once they have reached thermal equilibrium? Assume no change of state of the water.
Heat capacity of iron nail is 450 J/kg/K
Heat capacity of water is 4138 J/kg/K
Homework Equations
Q=mc∆T
The Attempt at a Solution
Q lost in nail=Q gained in water
let T = final temperature
0.15*450*(800-T)=1*4138*(T+25+273)
T=-280.38 K
I don't know why it is negative. Can someone explain what I did wrong?