[填空题]
A person of mass 75 kg stands at the centcpqtknm * 1er-1-7i vyer of a rotating merry-go-round platbu,ptv 1vdq;,f4 uz8 e bww(4zform of ra tp4zbfwq(e, ub4v,81uw z;v ddius 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
