I think the answer is, no, we cannot tell you. One reason is that there isn't just one thing "glottal stop". There is a dissertation Production and perception of glottal stops which covers the literature including the various different types of sounds involving glottal and ventricular adduction. Another reason is that longitudinal tension cannot be measured, it is only assumed based on theoretical modelling, and there is too much uncertainty regarding the factors that would go into computing that force. Some literature on vocal fold vibration
van den Berg (1958) "Myoelastic aerodynamic theory of voice production", Ishizaka & Matsudaira (1968) "What makes the vocal folds vibrate", Stevens (1977) "Physics of laryngeal behavior and larynx modes",
Eckert & Laver (1994) Menschen und ihre Stimmen. These sources would give you a conceptual framework for computing that force, as a physics exercise.
For what it's worth, you correctly state the two forces and the standard right angle assumption.