The stick in the left picture is from the right end welded and the material from which it is made The modulus of elasticity is E = 200 GPa. Total elongation in the rod? F=18kN   L1=85mm  L2=170  L3=136  A1=34cm^2  A2=17cm^2  A3=25.5cm^2

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.