[问答题]
A person stands, han3mip,g)w j+td ds at his side, on a pla,su(6o9kvo:fu3ds p ttform that is rotating at a rate of 1.o:td 3 f6kpsuov( s9,u3rev/s If he raises his arms to a horizontal 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
