Why does no electricity cause problems for some energy resources?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

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.