An element for sensing local shear stress is positioned in a flat plate 0.40 meter from the leading edge. the element simply consists of a small plate, mounted flush with the wall, and the shear force is measured on the plate. the fluid flowing by the plate is air with a free-stream velocity of 30 m/s, a density of 1.2 kg/m3 and a kinematic viscosity of 1.5 × 10-5 m2/s. the boundary layer is tripped at the leading edge. what is the magnitude of the force due to shear stress acting on the element?

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.