[填空题]
A helicopter rotor blade can be considered a long thin rod, as sho4by3tn flnsxgv9l0 *p( +jle0wn in Fig. 89v/)a91kv if xp j,mjq–46mjf) q i9ax/9vv,1p kj. (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
