The propeller of an airplane is 9 feet in diameter. What is the speed of the tip of a propeller blade if the angular velocity of the propeller is 50 radians per second?
Radius= Diameter/2 = 4.5 feet = 1.3716 metres
ω= 2πf
v=2πrf= ωr = (50)*1.3716 = 68.58 = 69ms^-1
