A venturi meter is used to measure air velocity. A one-fifth model of the venturi meter is built, and water is used as the test fluid. Viscosity of air is 1.82x10-5 N. s/m2. Viscosity of water is 9.82 x 10-4 N. s/m2. What will be the approximate ratio of the model to actual velocities observed?

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?