[填空题]
A person of mass 75 cfg/* .qh2 7xqani/owmv4 eopekjt gjg . e.cl*3q)e46 )lel1kg stands at the center of a rotating merry-go-round platform of radius 3.0 m and *jt m 6eq. )g3ko v)cglel4.lee1ejp4moment 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
