[填空题]
A person of mass 75 k:(ak+ hgc w 2qh9 zecp.4f3zyjg stands at the center of a rotatim(oewus 0 1l(sng merry-go-round platform of radius 3.0 m and momenouss0( e1mwl (t 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
