posted on Feb, 23 2013 @ 08:22 PM
Originally posted by connelly4245
I've worked it out now! lol. you've changed the distance of 10350m into a speed of 23152mph
theres no chance something in earths atmosphere could travel that speed
JrDavis may be wrong on multiple levels in this thread, but let's have a closer look at the speed:
Since meteor speeds are usually measured in km/sec it'll be easier to work in these units.
23152 mph translates to 37,260 km/h
(37,260/60)/60 gives us 10.35 km/s
This speed actually falls well within the speed range a large meteoroid/asteroid can travel through the atmosphere at, given that they usually enter
the atmosphere at speeds ranging from 11 km/sec to 72 km/sec (25,000 mph to 160,000 mph), and are then significantly slowed down by the
12. How fast are meteorites traveling when they reach the ground?
Meteoroids enter the earth’s atmosphere at very high speeds, ranging from 11 km/sec to 72 km/sec (25,000 mph to 160,000 mph). However,
similar to firing a bullet into water, the meteoroid will rapidly decelerate as it penetrates into increasingly denser portions of the atmosphere.
This is especially true in the lower layers, since 90 % of the earth’s atmospheric mass lies below 12 km (7 miles / 39,000 ft) of height.
At the same time, the meteoroid will also rapidly lose mass due to ablation. In this process, the outer layer of the meteoroid is continuously
vaporized and stripped away due to high speed collision with air molecules. Particles from dust size to a few kilograms mass are usually completely
consumed in the atmosphere.
Due to atmospheric drag, most meteorites, ranging from a few kilograms up to about 8 tons (7,000 kg), will lose all of their cosmic velocity while
still several miles up. At that point, called the retardation point, the meteorite begins to accelerate again, under the influence of the Earth’s
gravity, at the familiar 9.8 meters per second squared. The meteorite then quickly reaches its terminal velocity of 200 to 400 miles per hour (90 to
180 meters per second). The terminal velocity occurs at the point where the acceleration due to gravity is exactly offset by the deceleration due to
Meteoroids of more than about 10 tons (9,000 kg) will retain a portion of their original speed, or cosmic velocity, all the way to the surface. A
10-ton meteroid entering the Earth’s atmosphere perpendicular to the surface will retain about 6% of its cosmic velocity on arrival at the surface.
For example, if the meteoroid started at 25 miles per second (40 km/s) it would (if it survived its atmospheric passage intact) arrive at the surface
still moving at 1.5 miles per second (2.4 km/s), packing (after considerable mass loss due to ablation) some 13 gigajoules of kinetic energy.
On the very large end of the scale, a meteoroid of 1000 tons (9 x 10^5 kg) would retain about 70% of its cosmic velocity, and bodies of over 100,000
tons or so will cut through the atmosphere as if it were not even there. Luckily, such events are extraordinarily rare.
All this speed in atmospheric flight puts great pressure on the body of a meteoroid. Larger meteoroids, particularly the stone variety, tend to break
up between 7 and 17 miles (11 to 27 km) above the surface due to the forces induced by atmospheric drag, and perhaps also due to thermal stress. A
meteoroid which disintegrates tends to immediately lose the balance of its cosmic velocity because of the lessened momentum of the remaining
fragments. The fragments then fall on ballistic paths, arcing steeply toward the earth. The fragments will strike the earth in a roughly elliptical
pattern (called a distribution, or dispersion ellipse) a few miles long, with the major axis of the ellipse being oriented in the same direction as
the original track of the meteoroid. The larger fragments, because of their greater momentum, tend to impact further down the ellipse than the smaller
ones. These types of falls account for the “showers of stones” that have been occasionally recorded in history. Additionally, if one meteorite is
found in a particular area, the chances are favorable for there being others as well.
Source: The American Meteor Society Meteor Shower FAQs
We also know that at some point, usually between 15 to 20 km (9-12 miles or 48,000-63,000
feet) altitude, the meteoroid remnants will decelerate to the point that the ablation process stops, and visible light is no longer generated. This
occurs at a speed of about 2-4 km/sec (4500-9000 mph).
So given this bit of info, and the footage which shows the end point of the meteor in some cases, we can safely say that the meteoroid/s or asteroid/s
were slowed down to 2 km/s (4500 mph) just by looking at a single video.
Originally posted by connelly4245
the energy created would be tremendous due to the earths atmosphere!
Which is exactly what occurred - energy equivalent to 500 kilotons of
was released in the blast, and the meteor itself outshone the Sun (probably even before the main blast).
edit on 23-2-2013 by FireballStorm because: ran out of room