Two ends of a steel wire of length 8 m and 2mm radius, are fixed at two rigid supports. Calculate the increase in tension in the wire when temperature fall by 10°C. [α steel =12x106K-1,ysteel=2x1011Nm-1]

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.