Discover Questions

When a person says "The Big Bang started from a singularity", how stupid would another person have to be to ask "so, nothing exploded"? How to find the average list of numbers? At what distance from the earth's Center is the gravitational acceleration 4.9m/s^2? how far is this above the Earths Surface? Kx+ 8y=k-4 3x + (k - 2) y= 1
solve for x and y in terms of k.? How fast must a 142-g baseball travel in order to have a de-broglie wavelength with lambda~100 pm?