Introduction[]
So in Avatar: The Last Airbender, Yangchen moves some clouds in his Avatar state. I'll be getting the AP of this feat.
Calculation[]
As shown in the image, the clouds go out to the horizon. Hence, 20000 meters is our radius. These don't look like storm clouds, so I'll assume they're stratus clouds. They're about 1000 meters in height.
Cloud Volume = pi * 20000^2 * 1000 = 1.25663706e+12 meters^3
Density of Air = 1.003 kg/meters^3
Cloud Mass = 1.25663706e+12 * 1.003 = 1.26040697118e+12 kg
Tree Height = 15.24 meters = 121 px
15.24 / 121 = 0.12595 meters per px
Distance Covered = 883 px = 111.21 meters
So basically, to find the timeframe, I looked at a specific part of the clouds and looked for how long it took (frame-by-frame) for that one part to go from off-screen on the right side to off-screen on the left side. The answer to this is 14 frames. This video played at 25 fps.
Timeframe = 14 / 25 = 0.56 seconds
Speed = 111.21 / 0.56 = 198.59 m/s
As shown in the video, the clouds actually don't go omnidirectionally. They go in one direction and they all have the same speed, so we can actually use 0.5 in our KE equation instead of 1/12.
KE = 0.5 * 1.26040697118e+12 * 198.59^2 = 2.48539576e+16 Joules
NikHelton's Revision[]
So I goofed, apparently. Angsizing is how I should be finding the size of this cloud for speed, so I'll do that via what NikHelton provided me. The mass is still good, though.
Screen Height = 968 px
Cloud Width = 720 px
Cloud Height = 968x / [720 * 2tan(70/2 deg)] = 1000 meters
968x = 1000 * [720 * 2tan(70/2 deg)]
968x = 1008298.86
x = 1041.63 meters
1041.63 / 720 = 1.447 meters per px
Total Distance Traveled = 1447 px = 2093.81 meters
Using the timeframe I got of 0.56 seconds.
Cloud Speed = 2093.81 / 0.56 = 3738.95 m/s
Cloud KE = 0.5 * 1.26040697118e+12 * 3738.95^2 = 8.81008535e+18 Joules
Final Result[]
Yangchen Moves Clouds = 5.94 megatons; Small City level+ (Low 7-B)
NikHelton's Revision = 2.11 gigatons; Large Mountain level (High 7-A)
This was the second weakest cloud KE calc I had done, but this new version is much more like it.