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# A-Level Physics thermal energy question

I'm stuck on a question, can anyone help me out. I don't understand how to work this out when there are two different materials involved:

A radiator is made using 5.4kg of iron. It is then filled with 3kg of water. Calculate its heat capacity, that is the heat required to raise the temperature of the whole thing per kelvin. Specific heat capacity of iron is 435jkg-1 and water is 4180jkg-1
(edited 7 years ago)
@AndrewC19, moved to Physics
Original post by AndrewC19
I'm stuck on a question, can anyone help me out. I don't understand how to work this out when there are two different materials involved:

A radiator is made using 5.4kg of iron. It is then filled with 3kg of water. Calculate its heat capacity, that is the heat required to raise the temperature of the whole thing per kelvin. Specific heat capacity of iron is 435jkg-1 and water is 4180jkg-1

The heat required to raise the iron by 1 K is $m_i c_i \times 1$ and that for the water is $m_w c_w \times 1$, and the sum of those is the heat required to raise the temperature of the whole thing by 1 K. Let the total specific heat capacity be $c_t$ and the total mass be $m_t$.

What equation can you then write?
33000 jk^-1