El número de Reynolds para un fluido de densidad y viscosidad y que se mueve con velocidad media v a través de un conducto cualquiera, está definido como:
NR=vDn

Demuestre que si el fluido se mueve por un tubo de sección transversal circular de diámetro D, el número de Reynolds para este caso se puede expresar como:
NR=4JπηD
Donde J=mt es el flujo de masa.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx hurrim timed

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2