Question

you have seen that an extra ordinary glass tumbler can crack if very hot or very cold water is poured into it . you have two glass tumblers made of ordinary glass one with the thick walls and the other with thin walls , which one is more likely to crack when very hot or very cold is poured into them ? why give answer

Answer 1

Using the formula of heat through conduction formula
H = kAdT/dx
here if both tumblers are made up of same material , same temp difference occured dT, area of both are same .
hence
H ∝ $\frac{1}{x}(wherexisdis\tan cebetweentwolayers)$
so in thin x is small and large amount of heat passed per second
where as x is large as compared thin and small amount of heat pass through it per second
hence thin tumbler will crack first when same temp diff occured for same time.