Question

What is the rotational energy of the blade at its operating

Answer 1

线密度 a = m/l, m=0.65kg, l=0.55m

角速度 w = 3470*2pi/60 = 363.2 rad/s

动能K = 2*int (r=0->l/2) 1/2 a*dr * (w*r)^2 = m/l * w^2 * int(r=0->l/2) r^2 dr

= m/l * w^2 * (l/2)^3/3 = 1/24 * (m*l^2) * w^2 = 1080.7 J