[问答题]
A person stands, hands at x/ 9 .r6;okq0ygdqcxfa.u3ft his side, on a platform that is rotating at a raeik01 co;a9n3 gij8mg i7n(aq te of 1.3rev/s If he raises his arms to a horiik0(7mg98a3cg;io jn1i e aqnzontal 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
