A steel wire of length 50 meters is required to transmit a 10 kN tensile load. Determine the smallest diameter wire that can be used if the tensile stress must not exceed 150 MPa and the elongation of the wire must not exceed 25 mm. (Esteel = 210 GPa).

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m