Answer:
Part a)

Part b)

Explanation:
As we know that mountain climber is at rest so net force on it must be zero
So we will have force balance in X direction


now we will have force balance in Y direction


Part a)
so from above equations we have



Part b)
Now for tension in right string we will have


The answer to this question is B I think
Answer: the first law of thermodynamics
Explanation:
If what your trying to ask is what does it mean its calcium