In a reheat Rankine cycle steam enters the high-pressure turbine at 11 MPa and 600 C at a rate of 10 kg/s and leaves at 1.9 MPa. Steam is reheated at a constant pressure to 600 C before it expands in the low-pressure turbine. - The isentropic efficiency of the high-pressure turbine is 90%; the low-pressure turbine and the pumps are ideal. - The water leaves the condenser as saturated liquid at a pressure of 100 kPa. Calculate the net power in kW.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

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?

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.