Please see the attached file for the fully formatted problem(s).
Cubical capacity width = 0.5m
Thickness = 3 cm
In a cube there will be of 6 faces so for determining surface area for heat transfer we will have to multiplied by 6 with area
So surface area for heat transfer = 6*(width) 2
A =1.5 m2
It can be calculated by Newton's law of cooling...
Newtons Law of Cooling is applied to solve a problem where the rate of ice melting is found.