Wind blows with a velocity of 77 km/h over a rectangular building with a flat roof. The building is 13.7 m long in the direction of the wind and 8 m wide. The air has a density of 1.247 kg/m and a kinematic viscosity of 1.42 x 10-5 m²/s. Assume the boundary layer is turbulent from the leading edge. Compute the drag force exerted on the flat roof by this flow.

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Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.