[问答题]
A person stands, hands at his side, on a poi: oqms-r aoec.x+ ,0u r7n+alatform that is rotating at a ratls*k3 poj1 rrbsnnf -/t), 9gbe of 1.3rev/s If he raises his arms to a horizontal posi rnbjbs r 9/-slk*otp) fg1n,3tion, Fig. 8–48, the speed of rotation decreases to 0.8 $rev/s$ (a) Why? (b) By what factor has his moment of inertia changed?
Post time 2025-2-18 20:00:22
