heated bricks or blocks of iron were used long ago to warm beds. A 1.49 -kg block of iron heated to 155 Celsius would release how many joules of heat as it cooled to 22 Celsius ?
mass of iron(m)-1.49kg
temperature difference(temp diff)=(155-33)=122 degree celsius
specific heat of iron(s)=450 J/(kg . Celsius)
heat =massspecific heat capacitytemp diff=4501.48122=81252 joules or 81.252 kJ