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Fat tire riders look like "fat heads."
On Wed, 08 Jul 2020 14:39:55 -0700, Jeff Liebermann
wrote: On Wed, 08 Jul 2020 07:46:16 +0700, John B. wrote: Ah well, my calculator were "rounded" a bit so perhaps my numbers are a bit off. So in the pursuit of greater accuracy one watt should be referenced as 0.00134102209244049000 hp. Umm... which type of horsepower is that? https://en.wikipedia.org/wiki/Horsepower Imperial, mechanical, metric, electrical, boiler, hydraulic, or air HP? I forgot about "tax horsepower": https://en.wikipedia.org/wiki/Tax_horsepower At the beginning of the twentieth century, tax power was reasonably close to real power; as the internal combustion engine developed, real power became larger than nominal taxable power by a factor of ten or more. Tax or fiscal HP is different for every country. In some countries (Switzerland) different for each canton or state. If a government needs more revenue, it just tweaks the formula. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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#62
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Fat tire riders look like "fat heads."
On 7/8/2020 7:29 PM, Jeff Liebermann wrote:
On Wed, 08 Jul 2020 14:39:55 -0700, Jeff Liebermann wrote: On Wed, 08 Jul 2020 07:46:16 +0700, John B. wrote: Ah well, my calculator were "rounded" a bit so perhaps my numbers are a bit off. So in the pursuit of greater accuracy one watt should be referenced as 0.00134102209244049000 hp. Umm... which type of horsepower is that? https://en.wikipedia.org/wiki/Horsepower Imperial, mechanical, metric, electrical, boiler, hydraulic, or air HP? I forgot about "tax horsepower": https://en.wikipedia.org/wiki/Tax_horsepower At the beginning of the twentieth century, tax power was reasonably close to real power; as the internal combustion engine developed, real power became larger than nominal taxable power by a factor of ten or more. Tax or fiscal HP is different for every country. In some countries (Switzerland) different for each canton or state. If a government needs more revenue, it just tweaks the formula. Your last sentence pithily sums up the issue of Illinois' constitutional change proposal at referendum next November. https://chicago.suntimes.com/2020/2/...u-need-to-know -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#63
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Fat tire riders look like "fat heads."
On Wed, 08 Jul 2020 19:36:51 -0400, Radey Shouman
wrote: Jeff Liebermann writes: I then assumed that the cube rule would also work in the opposite direction. To move the wind twice as fast requires eight times the energy driving the motor and turbine. Again, notice that there's no distance involved, yet. However, if I place a bicycle in the air flow with a sail to catch the wind, the bicycle would be traveling at the same speed as the wind. The bicycle will still arrive in half the time, but because the 8x energy had already been delivered to the wind by the motor and turbine, it still requires eight time the energy to ^^^^^^ There's your problem -- it requires eight times the *power*, but only four times the total energy. Power is energy (or work) divided by time. If you quadruple the force retarding your bicycle, and also double the speed (distance divided by time), then you'll have to deliver eight times the power (distance multiplied by force divided by time). Y'er right. Mixing power and energy is where I made my mistake. That's the same explanation provided by Ralph and Frank, but I didn't understand it until now. Thanks for the correction. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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