[问答题]
A person stands, han18dt exv afqcv+q+.m)ds at his sidej+ nv1ra3nhee5aq as++ he) n(, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal positionsha r+ ) e3( qvaahe15n+ne+jn, 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
