[填空题]
A person of mass 75 kg stand(u7+ztlqzj :a l-w3 97rtmqyns at the center of a rotating m*fn+mpea-qhu8 b*5g j h:9iqcerry-go-round platform of radius 3.0 m and moment of inertia 920 9+fq-j8nbhep * qcm 5a:ui*g h$kg \cdot m^2$ 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
