Engineering, 14.12.2019 03:31 gabrielmartinsotr4yl

Acommercial airplane has a total mass of 150,000 lbm and a wing planform area of 1800 ft2. the plane has a cruising speed of 550 mi/h and a cruising altitude of 38,000 ft where the air density is 0.0208 lbm/ft3. the plane has double-slotted flaps for use during takeoff and landing, but it cruises with all flaps retracted. assuming the lift and drag characteristics of the wings can be approximated by nac a 23012, determine

(a) the minimum safe speed for takeoff and landing with and without extending the flaps,
(b) the angle of attack to cruise steadily at the cruising altitude
(c) the power that needs to be supplied to provide enough thrust to overcome drag. take the air density on the ground to be 0.075 lbm/ft3.

Answers: 1

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Answers: 3

Answer

Engineering, 06.07.2019 03:30

Abrayton cycle operates with a regenerator on the air-standard with properties evaluated at 400 k. the tem- perature of the air entering the compressor is 350k while the temperature of the air exiting the compressor is 600 k. the temperature of the air entering the turbine is 1600 k. the overall cycle produced 600 kj/kg of net work out. assuming a regenerator effectiveness of 0.8, what is the temperature of the air before heat addition (combustion)? draw this process on a t - s diagram

Answers: 3

Answer

Engineering, 06.07.2019 04:10

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump

Answers: 2

Answer

Engineering, 06.07.2019 04:10

Steam enters a converging nozzle at 3.0 mpa and 500°c with a negligible velocity, and it exits at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: is isentropic (a) (b) has an efficiency of 94 percent

Answers: 1

Answer

You know the right answer?

Acommercial airplane has a total mass of 150,000 lbm and a wing planform area of 1800 ft2. the plane...

Questions