what does it look like inside a black hole?
To answer this, I will focus on one of its classical definitions – its escape velocity is the speed of light or greater. The total Energy Etotal of a particle of mass m interacting with a planet of mass M is the sum of its Kinetic Energy and its Potential Energy. Conservation of energy dictates that this sum is a constant. We have, Etotal = Kinetic Energy + Potential Energy = constant In Newtonian Mechanics, particle m’s Kinetic Energy can be defined as ½mv2, where m is its mass, and v its velocity. The Potential Energy of particle m and planet M is -GMm/R. (G is the gravitational constant, M the mass of the planet, and m the mass of the particle. R is the distance between the center mass of planet M and the center of mass of particle m.) Hence, Etotal = ½mv2 – GMm/R = constant. If Etotal < 0, the particle m is bound to the planet M (such as the moon is bound in its orbit about the earth and most of us are stuck on this earth). The particle m escapes planet M’s orbit (such as the Mars
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