A Boeing 777-200LR loaded to 92% of its maximum take-off weight takes off from Dubai International Airport (24.4 m elevation) during an average day in July
(34.5 °C) with a standard pressure day (101.3 kPa). Assume that the take off
speed is 376 kmph. What is the minimum coefficient of lift needed at the point
where the aircraft just lifts off the ground? A 777-200 has a maximum take-off
weight is 347,452 kg and its wing area is 427.8 m2

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