Tarzan of Physic C?!!!!!!!!!!!!!?

Question

Tarzan, who weighs 688 N, swings from a cliff at the end of a convenient vine that is 18 m long (Figure 8-37). From the top of the cliff to the bottom of the swing, he descends by 3.2 m. The vine will break if the force on it exceeds 950 N. (a) Does the vine break? (b) If no, what is the greatest force on it during the swing? If yes, at what angle with the vertical does it break?

you can see the figure in this link Prob no. 23 http://www.lowellphysics.org/beta/Textbook%20Resources/Chapter%208.%20Potential%20Energy%20and%20Conservation%20of%20Energy/Problems/c08x8_10.xform.htm

Answer 1

Conservation of energy (From the top of the cliff to the bottom of the swing):

K=U

.5*m*v^2=m*g*h

v^2=2*g*h

Total force = centripetal force so:

T-w=m*v^2/l

T = tension

l = vine length

solve for T and compare the result to 950N