Your local electric company supplies you 1 k/w (kilowatts) of power for 1 hr. for 8 cents. Assume that you could climb stairs continuously for 1 hr. How much money would this climb be worth?
2007-02-04 11:52:25 · 2 answers · asked by Sally s 1 in Science & Mathematics ➔ Engineering
Good question in the subject of work equivalence, but we must first know the height of the stairs and how much you weigh. And, a gentleman never discusses a lady's weight. So, the problem is doomed.
2007-02-04 15:32:02 · answer #1 · answered by ZORCH 6 · 1⤊ 0⤋
Well, it depends on how fast you climb and what you weigh.
Let's assume - for purposes of calculation that you weigh 550 Newtons (125 pounds or so) and that you can take a step twice a second up a 20 cm step.
So, in an hour, you've climbed 3600 * 20 cm = 72,000 cm
So, energy is force times distance so, 550N * 72M = 36000 joules.
to get power, divide by seconds -- so, you get 10 watts, or 0.01 Kilowatts
so 0.01 time $0.08 is eight one-hundreth's of a cent of electricity
2007-02-05 00:48:52 · answer #2 · answered by rboatright 3 · 0⤊ 0⤋