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Comment by sokoloff

4 years ago

> you really start to feel the air resistance and it becomes exponentially harder to go beyond 45kph

Nitpick: it becomes cubically harder. ;)

5 comments

sokoloff

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antisthenes  4 years ago

Nitpick to nitpick: cubically is a subset of exponentially.

  • newaccount74  4 years ago

    You are both wrong. Air resistance increases quadratically with speed, not cubically. And you mixed up polynomial with exponential.

    Quadratic: x^2

    Cubic: x^3

    Polynomial (eg. 3rd degree): a + b x + c x^2 + d x^3

    Exponential: e^x

    • sokoloff  4 years ago

      Drag force rises quadratically with speed. Power is force dot velocity; in this case force and velocity are in the same direction, so dot product becomes simple mulitiplication making drag power (exertion, formally: work per unit time) cubic with speed.

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    • antisthenes  4 years ago

      I'm not wrong, because I wasn't commenting on the power of the exponent.

      But thanks for being a typical HN.