Se o universo tem uma idade definida, de aproximadamente 13,7 bilhões de anos, o que existiu antes do big-bang?

Define the meaning of the unalienable rights of life liberty and persuit of happiness

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of