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Set up a table for both of the stones. (This table works for any free-fall problem by the way)

stone 1:
y(initial)= 70 m (since it starts at the top of the cliff)
y(final)= 0 m (since it ends at...

Well technically you could have an external tank that supplies the oxygen. I realize that this is not how it is done with actual suits as they serve multiple purposes, but a pressurized tank would...

Think about this in terms of periodic motion. Both a planet and the pendulum return to the same spot over and over again (unlike say a car driving down an interstate.)

This will occur with the period if the pendulum is filled with water and gradually begins to leak until empty. It is about how the center of mass of the object changes.

This is correct. Change in momentum is related to force, not energy.

a) Actually steam is NOT hotter than water. Steam and water can both exist at 100 degrees Celsius. A steam burn is worse than a hot water burn because the steam is in a different phase. When the...