What are five things that must be true in order for a substance to be considered a mineral?

Explain vector addition, triangle method and parallelogram method

The energy equivalent of the rest mass of an electron is

Determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed σ=19 mpa and τ=24 mpa, respectively.