A. 314 because when you use the formula for the GPE ; GPE=MGH or means mass times gravity time height (4x8x9.8) and thats equivalent to 313.6 which rounds up to 314. Hope it helps
I think it was either Robert Hook or Anton Van Leevwen Hoek
Battery based heaters use electric resistance heating, which uses a lot of current (electricity) to create the heat.
Every atom with 15 protons in its nucleus
is an atom of Phosphorus.
