hey, we were asked to run up some stairs and find the power and then convert to horsepower.(adsbygoogle = window.adsbygoogle || []).push({});

Heres what i did. Converted my mass into newtons, and got 644.84N.

The distance ran was 9.7m in a time of 3.7s.

using the formula W=F*DeltaD*cos(theta) I got a total energy of 6254.95J

Using P=W/t I got a power of 1690.53watts, and converted this into horsepower and got 2.265hp. Does this sound reasonable?

We also had to get the height of the stares...why??? We were not asked to find GPE but im guessing it plays some roll in the question.

Also, what would the ratio of GPE to KE look like going up the stairs? Because you are expending energy going up the stairs by increasing your GPE and you also had to use some energy to get your KE. My thought is that they would not be the same because it takes more energy to go up then down.

thanx

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Energetic Question Varification & help

**Physics Forums | Science Articles, Homework Help, Discussion**