A 60 cm long, 500g bar rotates in a horizontal plane on anaxle that passes through the center of the bar. Compressed air isfed in through the axle, passes through a small hole down thelength of the bar, and escapes as air jets from holes at the endsof the bar. the jets are perpendicular to the bars axis. Startingfrom rest, the bar spins up to an angular velocity of 150 rpm atthe end of 10s.

a) How much force does each jet of escaping air exert on thebar?
b) If the axle is moved to one end of the bar while the airjets are unchanged, what will be the bar's angular velocity at theend of 10s?