A suddenly applied compressive load induces in a 250 mm long steel bar a maximum stress of 200 MPa. If the bar has a cross-sectional area of 800 mm² for half of its length and a cross- sectional area of 500 mm² for the remaining half, calculate (a) the magnitude of the load; (b) the energy absorbed; and (c) the instantaneous extension of the bar. (Take E as 200 GPa.)

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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.