NASA and SpaceX have two different rocket designs. NASA has a mass flow rate of 250 kg/s and an exit velocity of 5500 m/s. SpaceX rocket has a mass flow rate of 350 kg/s and an exit velocity
of 2000 m/s. Which rocket produces the most thrust?

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

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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?