[填空题]
A person of mass 75 kg stands at the center of a rotating merry-gz: w(7e-2jn u am:qpi 1/xhspzo-round l(; rua-;suvo iy h(-oplatform of radius 3.0 m and h ray so(ilou--vu(;; moment of inertia 920 $kg \cdot m^2$ The platform rotates without friction with angular velocity 2 $rad/s$ The person walks radially to the edge of the platform. (a) Calculate the angular velocity when the person reaches the edge. $rad/s$ (b) Calculate the rotational kinetic energy of the system of platform plus person before and after the person’s walk.$KE_i$ = J $KE_f$ = J
Post time 2025-2-18 20:00:22
