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  #208 Energy
Entry 1 of 20
TWISTER!!!       ©2018 A.N.Other
Panasonic DMC-TZ30       1st place, 159 points
1/59s, f3.3, ISO 100, 24mm, Normal Program, Pattern, flash
Post-Processing: Cropped,
Liquify tool,
Dodge and burn,
Clone tool,
Spot removal tool,
Noise reduction,
      Extra Info: Tornado energy.
Most of the energy of a tornado is energy of motion: kinetic energy (KE).

KE = 1/2 m v2


m = mass (of air in tornado)
v = velocity (wind velocity in tornado).

Let's assume that wind velocity is typical of an F3 tornado, around 300 km/hr.
v = 300 km hr-1 = 80 m s-1

To get the mass, recall that m = r V, where r = density and V = volume. The appropriate density is that of air: r = 1 kg m-3.
To estimate the volume, make a simplifying assumption: approximate the tornado shape by a vertical cylinder with height h and radius r. The volume of the cylinder is
V = p r2 h

Assume the cylinder is 1 km in height and 1 km in radius.
Substituting volume and density into the equation for mass, then substituting for mass in the expression for kinetic energy,

KE = 1/2 p r2 h v2
= 1/2 p (103 m)2 (103 m) (80 m s-1)2
= 3 x 1012 J = 3 x 1019 ergs.

That's a LOT of energy!
18 comments on this entry
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Nov 13, 2018
    Thank you all so much for the lovely congrats :-) .

Mepo - You are very kind - I did have to spend longer than normal PP'ing my sheep shot this challenge.

Nov 13, 2018
    Congrats on your well deserved win!

Nov 12, 2018
    Congrats. I'm looking forward to learning more. I do admire the amount of work you put into your entries and the great results you achieve.

Nov 12, 2018
    Congratulations on 1st place. I'm glad you are going to divulge how you captured this shot.

Nov 12, 2018
    Congrats on great 1st place - my first choice.

    Comments After End of Challenge    
    Comments During Voting    

Nov 12, 2018
    Unique display of energy! I hope it is a miniature version.

Nov 12, 2018
    My favorite. Beautiful lighting and contrast. Neat composition, too.

Nov 12, 2018
    Thanks very much both. It was a fun photo to take. I went for the huge plasma ball but sadly it had gone so took this instead.
Edited on Nov 12, 2018

Nov 12, 2018
    An interesting shot. It looks like a very small tornado but it's impressive all the same.

Nov 12, 2018
    Excellent job of capturing all that energy. The detail is wonderful. B&W was a great choice.

Nov 12, 2018
    Thank you very much both. I'm so glad you like it :-) .

jomari - No, this isn't a negative. Just a higher contrast version of what I saw with some other PP. It is inverted vertically however.
Edited on Nov 12, 2018

Nov 12, 2018
    Yes, that is a LOT of energy! Interesting photo , very high in my faves.
I assume this is inverted to the negative? At first I thought it was water going down towards a drain.

Nov 10, 2018
    Thankfully I have never experienced one; however, your image certainly portrays the energy within the funnel. Extremely clever and perfect for the challenge. High in my favs.

Nov 10, 2018
    Thanks both :-).

Stevebee - All will be revealed in the outtakes thread :-). It might take me longer than normal to post anything there as we have a bit of a family event tomorrow.

aoc46 - You are correct. Not much harm to a fly I'd guess but mesmerising to observe. I took dozens of photos and had a tough time deciding which to enter. I never thought of superimposing it! I'll have to give it a go some time :-).
Edited on Nov 12, 2018

Nov 9, 2018
    Enigmatic image. Would be more interested in the details of exactly what you photographed and how than in the kinetic energy calculation.

Nov 9, 2018
    Despite the physics lesson, I suspect that this 'twister' was of much smaller size that a real one and so evokes a lesser sense of energy. But what if you superimposed this image on one of a landscape...? Nicely shot, nonetheless.
Edited on Nov 9, 2018

Nov 9, 2018
    Sure. Please check the outtakes thread after the challenge ends.

Nov 9, 2018
    All the math aside, can you tell us how you got this shot?
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