4 ms·
TIL: The first law of thermodynamics has an exception for dead fish. (JK, don't cite me in physics class!)
by a3w 5y ago
TIL: The first law of thermodynamics has an exception for dead fish.
(JK, don't cite me in physics class!)
- munificent 5y agoWell, actually... In this case, the fish isn't a closed system. It's harvesting energy from the moving water, which requires external energy from the sun to keep the water cycle going.
- bocytron 5y agoReminds me of Derek's video about a vehicle which is powered against wind: https://youtube.com/watch?v=jyQwgBAaBag https://youtube.com/watch?v=jyQwgBAaBag
- Maursault 5y agoHis claim about a sailboat not being able to exceed windspeed sailing directly downwind is deceiving because it is definitely not the fastest point of sail. I believe this is done for dramatic effect to make Blackbird's feat sound more incredible. Sailing close hauled, almost directly into the wind, can achieve double wind speeds near effortlessly on low draft racing multihulls, and possibly on land with whatever those sailing carts are called. Of course, directly downwind is the only course for this experimental propellor craft, thus the only criteria.
- tobinfricke 5y agoBut that's the entire point of Blackbird: to show that it is possible to sail directly downwind faster than the wind. It is not immediately obvious that this is possible.