[问答题]
A person stands, hands at his side, on a platfgl6p -l kx1w8borm that is rot89iu- 6v io udr m6yuq /,cb1,sxn9vztating at a rate of 1.3rev/s If d/-iy1qzvbu,6co9 r8m inu69 ,uxtvshe 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
