A car's tyres have diameter of 24.9 cm. If the car starts from rest and in 21 s its tyres are rotating at 20.5 rev/s. Find linear acceleration of the car.

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

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.