College Physics (4th Edition)

The amount of heat required is $2.45\times 10^5~J$
We can find the amount of heat required to raise the temperature by $1.4~ C^{\circ}$: $Q = m~c~\Delta T$ $Q = (50.0~kg)(3500~J/kg~C^{\circ})(1.4~C^{\circ})$ $Q = 2.45\times 10^5~J$ The amount of heat required is $2.45\times 10^5~J$.