Answer:
[tex]T = m*g*cos\theta[/tex]
Explanation:
Since tarzan moves in a circular trajectory we can sum all forces on the centripetal-axis:
[tex]T - m*g*cos\theta = m*a_c[/tex]
[tex]T - m*g*cos\theta = m*V^2/R[/tex] Since the speed is zero:
[tex]T - m*g*cos\theta = 0[/tex]
[tex]T = m*g*cos\theta[/tex] Having Tarzan's mass we could calculate the module of the tension in the vine.