Answer:
5400 J
Explanation:
The amount of heat energy required to increase the temperature of a substance is given by:
[tex]Q=mC\Delta T[/tex]
where:
m is the mass of hte substance
C is the specific heat capacity of the substance
[tex]\Delta T[/tex] is its change in temperature
For the block of iron in this problem, we have:
m = 0.4 kg is the mass of the block
[tex]C=450 J/kg^{\circ}K[/tex] is the specific heat of iron
[tex]\Delta T=325-295=30 K[/tex] is the increase in temperature
Therefore, the amount of heat absorbed by the iron is:
[tex]Q=(0.40)(450)(30)=5400 J[/tex]
