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... This object in 1971 was called a black hole because if light waves cannot escape, the object would appear black (What is a black hole?; Black Holes, April 2000). ... Black holes are a bottomless void in the universe that objects can fall into (black holes), they have a very large mass and a comparatively small radius which makes the velocity needed for particles the escape very high. ... 5
Black holes demonstrate a part of Einstein’s General Theory of Relativity. ... This theory uses the word gravity not as a force but as a fabric of space that object respond to by following these curves in space caused by a massive object, such as a black hole (figure 1. ... Black holes have three properties – mass, angular momentum and electric charge; black holes have no composition. ...
To determine the schwarzschild radius of a black hole the mass is needed. If the mass of the black hole is known a simple formula can be used that was derived from the conservation of energy law. ... However for the second point the kinetic and potential energy would be zero as the amount of kinetic energy needed would be used to escape the black hole, extra would be wasted. ... Therefore the formula can be rearranged to make the schwarzschild radius formula (An Introduction to Black Holes):
rs = 2Gm
c2
rs = Schwarzschild radius (metres)
c = speed of light (299 792 458ms-1)
G = gravitational constant (6.67 x 10-11 Nm2kg-2)
M = mass of black hole (kilograms)
When trying to work out the schwarzschild radius for a black hole given the mass the above formula would be used.
Black hole with mass of earth:
mass of earth = 5. ... 87 mm
Black hole with mass of sun:
mass of sun = 1. ... 1046 m
Black hole with mass of star of Carina (150 solar masses):
mass of 150 solar masses = 1. ... 8187 km
Therefore the larger the mass of a black hole the larger the schwarzschild radius.
Absolute Temperature
The absolute temperature of a black hole depends purely on the mass of the black hole. This can be calculated using the schwarzschild radius formula as seen earlier or by calculating the velocity of an object orbiting the black hole i. ... Formula for absolute temperature (Black Hole Temperature):
Ta = h. ... 67 x 10-11 Nm2kg-2)
m = mass of a black hole (kg)
Ta = absolute temperature (Kelvin)
Therefore: Ta = (6.
Approximate Word count = 1956
Approximate Pages = 7.8
(250 words per page double spaced)
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