That's my Sunday afternoon sofa film sorted
Question directed to all the enlightened ones out there:- A rock weighing several tons, lets say 10, travelling, at lets say, 50,000MPH, hits hard earth, what is its explosive yeald, how big would the crater be, and how far from ground zero would the destruction spread... Same question in open water?
(If it hits Birmingham (UK) then that's a bonus.)
That would not be particularly destructive. It would be a right bastard if it hit you and would certainly ruin your day. It probably wouldn't even form a crater (maybe a few very small ones from fragments).
But based on your question and making a few assumptions in line with the question (assuming a 2M wide meteorite of average density, say 2000kg/m^3 hitting sedimentary rock (most likely for an impact on land) at 90 degrees (worst case) then its as follows:
Distance from Impact: 10.00 km ( = 6.21 miles )Projectile diameter: 2.00 meters ( = 6.56 feet )Projectile Density: 2000 kg/m3Impact Velocity: 22.00 km per second (= 50,000 mph) Impact Angle: 90 degreesTarget Density: 2500 kg/m3Target Type: Sedimentary RockEnergy:Energy before atmospheric entry: 2.03 x 1012 Joules = 0.48 x 10-3 MegaTons TNTThe average interval between impacts of this size somewhere on Earth is 0.3 yearsMajor Global Changes:The Earth is not strongly disturbed by the impact and loses negligible mass.The impact does not make a noticeable change in the tilt of Earth's axis (< 5 hundreths of a degree).The impact does not shift the Earth's orbit noticeably.Atmospheric Entry:The projectile begins to breakup at an altitude of 69700 meters = 229000 ftThe projectile bursts into a cloud of fragments at an altitude of 51400 meters = 169000 ftThe residual velocity of the projectile fragments after the burst is 20.1 km/s = 12.5 miles/sThe energy of the airburst is 3.43 x 1011 Joules = 0.82 x 10-4 MegaTons.No crater is formed, although large fragments may strike the surface.Air Blast:The air blast will arrive approximately 2.65 minutes after impact.Peak Overpressure: 32.6 - 65.2 Pa = 0.000326 - 0.000652 bars = 0.00463 - 0.00926 psiMax wind velocity: 0.0769 m/s = 0.172 mphSound Intensity: 30 dB (Easily Heard)
Imperial College have an impact calculator here:
To ethnically cleanse Brum (of all ethnicities) you need to think bigger. Much bigger than your hypothetical tiddler.
Many thanks for your very detailed answer, I can only assume that the asteroid that is about to hit earth, will do negligible damage if it impacts open land, on a city, that's another topic for discussion.
Late Edit:- If it hit Birmingham, apart from the damage, who would notice the difference?
True but, apparently, I can refute your assertion by kicking a nearby rock!