Urgent please help me...

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

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

What is creep? what is stress relaxation?