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Discussion
tvrolet said:
Blib said:
Pitre said:
Watt defined one horsepower as "the amount of work required from a horse to pull 150 pounds out of a hole that was 220 feet deep".
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Blib said:
Pitre said:
Watt defined one horsepower as "the amount of work required from a horse to pull 150 pounds out of a hole that was 220 feet deep".
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Power is a measure of the rate at which work is done (or similarly, at which energy is transferred). Did Watt really ignore time?
Am I banned now?
bigothunter said:
That's change in potential energy (mgh).
Power is a measure of the rate at which work is done (or similarly, at which energy is transferred). Did Watt really ignore time?
Am I banned now?
Nope - Watt accounted for time. Wiki confirms…Power is a measure of the rate at which work is done (or similarly, at which energy is transferred). Did Watt really ignore time?
Am I banned now?
Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet (3.7 m) in radius; therefore, the horse travelled 2.4 × 2π × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds-force (800 N).
I remember the concept and the horse=15hp peak from my Mech.Eng degree…but that was just short of 50 years ago so have to rely on Wiki for the finer details.
tvrolet said:
Nope - Watt accounted for time. Wiki confirms…
Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet (3.7 m) in radius; therefore, the horse travelled 2.4 × 2? × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds-force (800 N).
I remember the concept and the horse=15hp peak from my Mech.Eng degree…but that was just short of 50 years ago so have to rely on Wiki for the finer details.
My question was rhetorical.Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet (3.7 m) in radius; therefore, the horse travelled 2.4 × 2? × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds-force (800 N).
I remember the concept and the horse=15hp peak from my Mech.Eng degree…but that was just short of 50 years ago so have to rely on Wiki for the finer details.
I graduated with a Mech Eng degree in 1976. So many moons ago like you.
bigothunter said:
tvrolet said:
Nope - Watt accounted for time. Wiki confirms…
Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet (3.7 m) in radius; therefore, the horse travelled 2.4 × 2? × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds-force (800 N).
I remember the concept and the horse=15hp peak from my Mech.Eng degree…but that was just short of 50 years ago so have to rely on Wiki for the finer details.
My question was rhetorical.Watt determined that a horse could turn a mill wheel 144 times in an hour (or 2.4 times a minute). The wheel was 12 feet (3.7 m) in radius; therefore, the horse travelled 2.4 × 2? × 12 feet in one minute. Watt judged that the horse could pull with a force of 180 pounds-force (800 N).
I remember the concept and the horse=15hp peak from my Mech.Eng degree…but that was just short of 50 years ago so have to rely on Wiki for the finer details.
I graduated with a Mech Eng degree in 1976. So many moons ago like you.
mickk said:
bigothunter said:
That's change in potential energy (mgh).
Power is a measure of the rate at which work is done (or similarly, at which energy is transferred). Did Watt really ignore time?
Am I banned now?
Change in PE = Final PE - Initial PE.Power is a measure of the rate at which work is done (or similarly, at which energy is transferred). Did Watt really ignore time?
Am I banned now?
Use it or lose it
mickk said:
DodgyGeezer said:
so if you lose it does that make it No power to = NPE - and therefore as it's so full of hot-air and BS it's actually infinite power?
I think you're correct and guess what?... I never graduated.
* First time around I managed just one year of a Geography degree @ Middlesex Poly in the 70s **
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