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Using the formula for gravitational attraction between the Moon/Earth and a test mass, m. We determine F_E = (G*M_E m)/(r_E² ), F_M = (GM_M<...

Let integrate be denoted by the letter I. For instance I(f) is the integration of a function f . Then Integration by parts states that I(u v') = uv - I(u' v), where u,v are function with u', v' their resp...

Picking 2 different types of storage would be a good start (i.e. not two different types of batteries; this way you have a little bit more to talk about as all storage types have their perks and setbacks)...

1.  Exclusion zone. Having an exclusion zone in predicted areas of pyroclastic flows can save many lives, like it did in the 1980 explosion of Mt St Helens. This meant that people were not allowed ...

Following Lenin’s death the power struggle for his succession was fierce, yet Stalin initially was not a central figure in the competition. Often described as the ‘grey blur’ by other party member...