Two objects exert a gravitational force of 4 N on each other. If the mass of one object is doubled, what will be the new force of gravity between the two objects?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

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 structural formula represents 4 electrons shared between two atoms?