An oxygen molecule consists of two oxygen atoms whose total mass is 5.3×10−26kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.9×10−46kg⋅m2.
from these data, estimate the effective distance between the atoms. (express your answer to two significant figures and include the appropriate units.)

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.