If the acceleration due to gravity at the surface of planet x is double the value of earth's, how does planet x's mass compare to earth's?

When an object is heated it contracts. a. true b. false

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.

What is the increase in density of a medium due to wave travel?