An aircraft cruising at 360 kmph takes a right turn on an arc of 100 m radius. The turbines and propellers have a total mass of 500 kg with radius of gyration of 25 cm. The engine rotates at 2000 r.p.m. The magnitude of the gyroscopic couple generated is
(a) 6.55 kN m (b) 7.65 kN m
(c) 9.81 kN m (d) 13.1 kN m