6 An engine crankshaft rotates at a constant speed of 1800 rpm driving a crank of radius 80 mm and a connecting rod 280 mm in length. The crank is rotating clockwise and is at a point 45° beyond top dead centre. Determine EACH of the following using a velocity diagram; b The angular velocity of the connecting rod; e The instantaneous velocity of a fixed point on the centre line of the connecting rod that is 100 mm from the centre of the crank pin. a The instantaneous velocity of the piston;