[填空题]
A helicopter rotor blade can be considered a long thin rzn q;ksjp1o// od, as*9xddj;oevncjb5; ;m f ljy;; shown in Fig. 8–46b;;ve*j; ; jdcojd ;fyn l95xm. (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
