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?

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

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.

The quality is zero at a)-the saturated vapour state b)-the saturated liquid state c)-the saturated liquid-vapour mixture state d)-none of the states in the other answers