[问答题]
A person stands, hands at his side, on a platfoc0bp5y6lay l8n t9u kjwe*a;*rm th2c1a pl/x wtxu1qe)t2at is rotating at a rate of 1.3rev/s If he raisesect aql/1t pu2 x1)2wx 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
