[填空题]
A person of mass 75 kg stands at the center of ae upb;e4fpx 4hehh-y7x--/q wo -a8ax rotating merry-go-round p,aaumb +(z6imgxo +k1j; i b*glatform of radius 3.0 m and mom gkmi 1z (*6+gbmi; uja+b,oxaent 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
