Problema Solution
A 2100 lb airplane requires a power of 100 hp at the propeller to climb at an angle of 20° to the horizontal at constant speed. How much altitude could it gain in 10 minutes if air resistance is ignored?
Answer provided by our tutors
Time t=10 m =60 sec.
E = 100 HP*550 ft∙lb/HP∙sec*600 sec = 33*10^6 ft∙lb
E = F*h
h = E/F = 33*10^6 ft∙lb/2100 lb
h = 15714 ft