Newton's Law of Gravitational Attraction. Shortly after formulating his three laws of motion, Newton postulated a law governing the gravitational attraction between any two particles. Stated mathematically, m¡m2 F = G- (1–2) where F = force of gravitation between the two particles G= universal constant of gravitation; according to experimental evidence, G = 66.73(1o-12) m²/(kg - s²) m1, m2 = mass of each of the two particles r = distance between the two particles

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.