I have done most of the work on the problem written below, but the more I look at it, the more I am not sure whether I should leave the pounds as they are instead of converting them to kilograms. If I leave it as 200 lbs, are the number plug-ins going to be wrong?(adsbygoogle = window.adsbygoogle || []).push({});

I am using the formula

g = 6.67x10^-11 x 6 x 10^24 / (2 x 6.40 x 10^3)^2 = 2.44 m/s^2 then W=mg which I have calculated at 20 x 2.44 = 48.8 N

A building is 6400 km high. On the bottom floor a person weighs 200 pounds when stepping on a spring scale. How much would the person weigh on the same scale if she were standing on the top floor?

I know that 6400 km is also the radius of the earth so that the top floor is 2R from the earth's center.

thanks!

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

Dismiss Notice

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!

# Homework Help: Weight at different elevations in a tall building

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