[填空题]
A person of mass 75 kg stands at the center4s7y: qu a7zdf+1m4,g wuar fl of a rota 5hqj4+pu9pp0z9 a 6b-6ujkzo.dpmywm( vd9v ting merry-go-round platform of radzd(uwmbmu0p 5a o9-p69jv.kvhj9 p z6y p+4qdius 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
