At what speed do the relativistic formulas for length differ from classical values by 1.00 %? (this is a reasonable way to estimate when to do relativistic calculations rather than classical.)

the reason is because the moon has some form of gravity, and that gravity pulls the ocean tides.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.