What heat is required to melt a 0.5 kg block of iron if initially it is at 20°C and the melting point of iron is 1200°C? The specifc heat capacity of the iron is 0.50 kJ kg –1 K –1 and the specifc...

What heat is required to melt a 0.5 kg block of iron if initially it is at 20°C and the melting point of iron is 1200°C? The specifc heat capacity of the iron is 0.50 kJ kg^–1
K^–1
and the specifc latent heat of fusion is 270 kJ/kg.

A steel tape-measure is correct at 18°C. If it used to measure a distance of 100 m when the temperature is 8°C, what error will be made? The coeffcient of linear expansion is 0.000 012/K.