Can be measured in ft2 in2 cm2 as well as other squares units

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet