[问答题]
A person stands, hands at his side, on a platform tvt*1 5aohwwywhb y l6qaw5/ 1ps9h;m5hat is rotati) zv h2g ahe,14+lyll fh:b1jt8+qfhbng at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rot lfjte)h2z+hqa l,41y hbl +gf1:bh v8ation 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
