Final answer:
To find the maximum block mass mmax for which the bar will always be stable, substitute m₂ = mmax into the equation for x_critical and solve for mmax.
Step-by-step explanation:
To determine the maximum block mass for which the bar will always be stable, we need to find the maximum value of m₂ such that x_critical ≤ 0. From the information given, we can see that x_critical is the point where the equilibrium becomes unstable. In other words, when x_critical < 0, the bar is stable regardless of the position of m₂.
To find the maximum m₂, we need to find the value of m₂ such that x_critical is less than or equal to zero. Using the equations and information provided in the previous parts, you can substitute m₂ = mmax into the equation for x_critical and solve for mmax. This will give you the maximum block mass mmax for which the bar will always be stable.