[填空题]
A person of mass 75 kg stands at the center of a rotating merry-go-roxc+7;ngc v5nef 8ok8x und plakqj,yracqq4. f82qi 5.2uvba tform of radiu 4r qi..q uk,qfja8vabc25 2yqs 3.0 m and 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
