[问答题]
A person stands, hands at his side; nzw fzq,)(em c ;rz+dqni/f+, on a platform that is rotating at a 0o+ v 4yr7famrjo5-f y0t)z xgrate of 1.3rev/s If he raises his arms to a horizontal 7 oo- m5v)jrt0gyar04yfzxf +position, 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
