[填空题]
A person of mass 75 kg stands at the centfccq k- 8*393 stfr 5fdn1dwpqer of a7 ia;,u*/j hcqse/2dshrzh 6 j rotating merry-go-round platform of radius 3.0 m and moment of inertia ehah;sdr/uj ,qc7j i/s *6h2z920 $kg \cdot m^2$ 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
