Thank you for the explanation. In my original post I made a mistake that the weight of the marble will be canceled by the buoyancy of water, due to marble descending at constant velocity. Now I see that regardless of the motion of marble, as long as it's stationary and the mass does not change...
Currently studying undergraduate level biochemistry at the University of Waterloo, Waterloo, Ontario Canada. First time here, it's a pleasure to meet you. Looking forward to having meaningful discussions with you all!
My reasoning is that
1)at initial condition, net force of stick on the beaker is equal to the weight of the weight minus the buoyant force applied by the water to the weight, which is the tension force in the string. The recorded weight should be equal to mass of beaker + water + net force of...