A beaker weigh 0.4 Newton when empty and 1.4 Newton when filled water. What does it weigh when filled with Brine of density 1.2 g/cm³ (density of water is 1g/cm³)

Answer 1

since the water weighed 1.0N, an equal amount of brine will weigh 1.2 times as much.
it will weigh 0.4 + 1.2*1.0 = 1.6 N