A brass dise fits tightly into the bore of steel palte. Should you apply heat in order to remove the disc from the bore?

A brass disc is fitted tightly into the bore of a steel plate. Should you apply heat in order to remove the disc from the bore? Given that alpha of brass =19 times 10^(-6@)C^(-1) and that of steel =12 times 10^(-6@)C^(-1) .

Statement I : A brass disc just fits in a hole in a steel plate. The system must be cooled to loosen the disc from the hole. Statement II : The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel.

A steel and a brass wire .each of length 50 cm and cross sectional area 0.005cm^(2) hang from a ceiling and are 15 cm apart Lower ends of the wires are attached to a light horizontal bar .A suitable downward load is applied to the bar so that each of the wires extends in length by 0.1 cm . At what distance from the steel wire the load must be applied ? [ Young 's modulus of steel is 2xx10^(12) dynes /cm^(2) and that of brass is 1xx10^(12)"dynes"//cm^(2)]

An external pressure P is applied on cube at 0" "^(@)C so that it is equally compressed from all sides. K is the bulk modulus of the material of the cube and alpha is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by