[填空题]
A helicopter rotor blade can be conslw y0j 3x,ztyg3x x4z1 cpzdh7h *e75lidered a long thr9 ;ecrj*tfes b.r/j:in rod, as shown in Fig. 8–46.c ;9 j:trrj/*sbefre. (a) If each of the three rotor helicopter blades is 3.75 m long and has a mass of 160 kg, calculate the moment of inertia of the three rotor blades about the axis of rotation. $kg \cdot m^2$ (b) How much torque must the motor apply to bring the blades up to a speed of 5 $rev/s$ in 8.0 s? $m \cdot N$
Post time 2025-2-18 20:00:22
