[问答题]
A person stands, hands at his side, on a platform that imk:n g*f9wnp5wr xw)yqn9 *j4s rotating at a rate qm 7ptg d, ,hu i2+tlcq9+:juyof 1.3rev/s gpj:q,yu 9hdti+ tc27lq+,muIf 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
