[填空题]
A person of mass 75 kg stands at the center of a ro y j;4miq8r.p l so.muu7f4(cctatinkcq:2 xg hy2,yg merry-go-round platform of radius 3.0 m and moment of inertia 920 c:kxq2yhyg, 2$kg \cdot m^2$ 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
