Explain how the solubility of water is useful in maintaining various life processes

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

If one fission reaction of a uranium-235 atom produced two neutrons, how many neutrons would be released if the chain reaction occurred three more times?

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.