[问答题]
A person stands, hands at his side, on a platformga2 - dztpqn2- that is rotatisb7cpa5pa 60 8pehn5ong at a rate of 1.3rev/so 8ase50apc76p b hp5n 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
