Question

a) If a person weighing 60 kg runs up stairs whose height is 400 meters, what is the power (in Watts and hp) developed by the person if it takes 12 minutes to climb that height?
b) If an aircraft engine develops a force of 200,000 Newtons forward on the aircraft, what is the power (in Watts and hp) developed by the engine if the aircraft is flying at 300 meters / sec.?
c) If a motor has an input power equal to 3750 Watts and an efficiency of 90%, what is the output power in Watts and in motor horsepower?
d) If a 50 hp motor has an efficiency of 0.80, what is the motor's input power?
e) If a motor has an input power equal to 400 Watts and an output power of 300 Watts, what is the efficiency (in decimal and percentage) of the motor?

Answer 1