[填空题]
A person of mass 75 kg stqn, s.4p o5 g3etv26pz k8xmauands a4clap; 2jx(a*vxrqe 9g r2+eps1 3obit the center of a rotating merry-go-round platform of radi3 *eg xl 2qac;ippbe(249a1 jsrv rx+ous 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
