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Since the drag force of water is significantly higher than air resistance, how would one quantify the increased energy need?
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Throwing an object underwater
- Thread starter Assaltwaffle
- Start date
- 1,673
- 289
Because science did a video on underwater movement about aquaman
https://youtu.be/HL0F_F1k7kw?t=209
The formula he uses there might be useful to find out how much energy is needed.
Basically
Power (Watts or Joules/S) = .5 (water density) (speed^3) (drag coefficient)(cross sectional area)
https://youtu.be/HL0F_F1k7kw?t=209
The formula he uses there might be useful to find out how much energy is needed.
Basically
Power (Watts or Joules/S) = .5 (water density) (speed^3) (drag coefficient)(cross sectional area)
- 8,425
- 3,273
- Thread starter
- #3
Speed cubed and no mass? Odd.
- 1,673
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In what way?
The base equation measures force in newtons, the speed is cubed because joules are newtons*distance and wattage is joules/second
so basically he is simplifying the equation, written another way it looks like this
Power (watts) = .5 (Water density) (speed^2) (drag coefficient) (cross sectional area) * (distance moved) / time
The base equation measures force in newtons, the speed is cubed because joules are newtons*distance and wattage is joules/second
so basically he is simplifying the equation, written another way it looks like this
Power (watts) = .5 (Water density) (speed^2) (drag coefficient) (cross sectional area) * (distance moved) / time
- 8,425
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- Thread starter
- #5
But how would you apply that to moving an object? That formula seems to present that mass of the moved object doesn't matter.
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You scale it directly to the total energy of the moving object since that's how much power it needs to move underwater. the mass of the moving object doesn't matter.
The problem comes when you try to scale it to AP since the energy measured here is lost trying to overcome the drag force in the first place,so it would only apply if the character could generate this much power in an enviroment without any drag or substantially less drag than water.
it would only technically scale to effective AP in an enviroment without any drag, for enviroments with less drag than water you would need to account for it and substract from the energy to get effective AP, though this can be ignored for conveniences sake since every form of kinetic energy feat ever would be affected and become a total a pain in the ass to properly measure.
The problem comes when you try to scale it to AP since the energy measured here is lost trying to overcome the drag force in the first place,
it would only technically scale to effective AP in an enviroment without any drag, for enviroments with less drag than water you would need to account for it and substract from the energy to get effective AP, though this can be ignored for conveniences sake since every form of kinetic energy feat ever would be affected and become a total a pain in the ass to properly measure.
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I know exactly what character he's asking about for this feat and the answer is yes, they can
