- #1

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thanks

Tired in Liverpool

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- Thread starter ls0803
- Start date

- #1

- 3

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thanks

Tired in Liverpool

- #2

dx

Homework Helper

Gold Member

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How high is each stair?

- #3

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12 inches i'd say

- #4

- 7,666

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I get 300 stairs = 225 vertical feet. The energy required to raise 280 pounds 225 feet is mgh = 280*225 (pounds = mg) =63000 lb*ft = 634 calories = 0.6 kcal (dietary calories). Say your body is 80% efficient, then you expend 0.75 kcal of food intake.

I'm suspicious of my answer- my calculator treats lb as a unit of mass (kg), so if I surreptiously add a factor of 32 to mgh, I get 20/25 kcal, which seems reasonable.

Bleah- it's too early in the morning to try and deal with pounds vs. kilograms.....

- #5

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lift for me tomorrow!

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