Rotational dynamics paradox/accelerometer "compact"

To investigate the relationship between the surface shape of rotating liquids and their angular velocity (formation of a parabola),
and also to demonstrate the proportionality of centrifugal force to mass (two spheres of different masses rise to the same height when rotated in the cuvette);

Round cuvette with mounting block and thread, to be screwed onto the compact magnetic building block with pivot bearing, one metal and one plastic sphere, opening for removing the spheres and filling the cuvette with a liquid
Material of the round cuvette: acrylic glass
Diameter of the round cuvette: 120 mm
Overall dimensions: 120 x 128 x 15 mm
Mass: approx. 80 g

additionally required:
P1345-1D MBC pivot bearing with transmission ratio