[填空题]
A person of mass 75 kg stands at the center of a rotati sl,+3 mltj5fgd3;iffg )+s kdng merry-go-round plakca:6xoh8s hdj1e u90tform of radius 3.0 m and moment of i6ad:js0 xhoc9h81u ek nertia 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
