# How mass change if 30M above earth surface?

1. Dec 8, 2008

### xlzhsteven

There is one question from my physics HW which asks "By what percentage does your rest mass increase when you climb 30 m to the top of a ten-story building?"

I don't know what equation to use to figure out the answer.

2. Dec 8, 2008

### fluidistic

Hi,
Rest mass is an intrinsic property of matter. It doesn't change as you climb up any building.
By the way your question shouldn't be asked in the "Advanced Physics" forum.

3. Dec 8, 2008

### xlzhsteven

There is one question from my physics HW which asks "By what percentage does your rest mass increase when you climb 30 m to the top of a ten-story building?"

I don't know what equation to use to figure out the answer.

4. Dec 8, 2008

### Dick

Why do you think your rest mass might change?

5. Dec 9, 2008

### xlzhsteven

it's what the question ask for

6. Dec 9, 2008

### Carid

No Steven you are wrong.
Dick is trying to get you to express your understanding of what rest mass is.
The question does not ask you this; it merely asks you how much it might change.
Once you have a clear understanding of what rest mass is then you will know the answer to your question.
Try and answer Dick's question first and if you still don't get it we can tell you the answer.