What is the difference between mass and weight? Weight is the observed effect of gravity on mass.
Mass is how much; weight is how much space.
Weight is how much; mass is how much space.
Weight and mass are the same everywhere.
Mass is the observed effect of inertia on weight.

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

What is the difference between mass density and weight density?