(1) The force balance of ice cubes makes the buoyancy of ice cubes equal to the gravity of ice cubes, that is, f float = g ice = m ice g = 20g×10n/kg = 0.2n; (2) The bottom pressure of the cup F = ρ liquid GHS = 0.98×103kg/m3×10n/kg×10×10-2m× 50×10-4m2 =