Final answer:
The pressure at the bottom of a cubic tank filled with water is determined by the depth of the water. This pressure is calculated using a formula that includes the density of water, gravity, and the height of the water column. Pascal's principle also indicates that pressure changes are transmitted undiminished in a fluid.
Step-by-step explanation:
The pressure at the bottom of a cubic tank filled with water depends on the depth of the water, as well as the density of the water and the acceleration due to gravity. This pressure can be calculated using the formula: Pressure = Atmospheric Pressure + (Density of water * Acceleration due to gravity * Height of the water column). Since the density of water is generally constant, the only variable that affects the pressure in this scenario is the depth of the water. Thus, the volume of water or the dimensions of the tank are irrelevant, as long as we know the depth of the water.
Additionally, it is important to note that according to Pascal's principle, pressure changes are transmitted undiminished in an enclosed fluid. Therefore, the pressure at the bottom of the tank increases if additional mass is added to the fluid.