Why is the mass of an atom's electrons not included in the atom's mass number

Gravitational force between two objects increases as mass increases and distance

How did the astronomy of hipparchus and ptolemy violate the principles of early greek philosophers?

A spring gun is used to project a 0.5 kg ball, in order to perform this experiment the spring was initially compressed by 0.005 m. Find the ball's speed when it leaves the gun, if the spring constant is 395 N/m.

Why can't ice transfer coldness into another substance?

How does friction slow things down?

Which universal force acts on protons and neutrons in an atom's nucleus?

How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?

What is a nuclear bulge? a) The bulging corner of a spiral galaxy consisting of gas in the shape of a spiral sphere that circles a galaxy b) The bulging center of a spiral galaxy consisting of debris in the shape of a flattened sphere that circles a

Your friend of mass 50 kg can just barely float in fresh water. Calculate her approximate volume.

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 61° angle to the normal. what is the angle of refraction?