[问答题]
A person stands, hands at his side, on agrz8fdi3t7m. u,kd n( platform that is rotativdpzy;i;x3)d h24wgo ng at a rate of 1.3rev/s If he raises his arms to a horizont ;oyd;i pw4d) vxhz2g3al 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
