What protects the earth from meteorites and the sun's rays? the jet stream wind the oceans the atmosphere

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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.