# Basic math - currious if I am handling it correctly

• Jan 18th 2010, 01:55 PM
wilder7bc
Basic math - currious if I am handling it correctly
little unsure on some exponent type math I did...

when I did the volume I took (4/3)(pie)(r)^3 basically just plugged in (1.2X10^-15) into my figures and it kicked out something approaching:
volume = - 2.44 X 10^7

I then divided Mass/Volume:

(1.67X10^-27)/(-2.44X10^7) = 6.84X10^-35

am I using these exponents correctly in scientific notation and getting the approximate right answers?

Thanks

Brian
• Jan 18th 2010, 01:57 PM
VonNemo19
Quote:

Originally Posted by wilder7bc
little unsure on some exponent type math I did...

when I did the volume I took (4/3)(pie)(r)^3 basically just plugged in (1.2X10^-15) into my figures and it kicked out something approaching:
volume = - 2.44 X 10^7

I then divided Mass/Volume:

(1.67X10^-27)/(-2.44X10^7) = 6.84X10^-35

am I using these exponents correctly in scientific notation and getting the approximate right answers?

Thanks

Brian

Please, if you would be so kind...Cite the given problem.
• Jan 18th 2010, 02:17 PM
wilder7bc
Quote:

Originally Posted by VonNemo19
Please, if you would be so kind...Cite the given problem.

Ok I had typed it up once but took it out so I didnt have to much information, I didnt want to clutter up someone else brain as my brain remains cluttered lol

A proton which is the Nucleus of a hydrogen atom can be modeled as a sphere with a diameter of 2.4 fm and a mass of 1.67X10^-27kg

(a). Determine the density of the proton

(b). state how your answer to part (a) compares with the density of Osmium, given in Table 14.1 (that was Osminum 22.6X10^3)

My formulas

Density = P = M/V Mass per unit volume

Volume of sphere = (4/3)(pi)(r)^3

my data:

Proton
Mass 1.67X10^-27kg
Diameter 2.4fm = (if I did scientific notation correctly) 2.4X10^-15

Osminum
Mass 22.6X10^3

I then plugged things in

(4/3)(pi)(1.2X10^-15)^3 = -2.44X10^7

Then divided mass by volume

(a). (1.67X10^-27)/(2.44X10^7) = 6.84X10^-35

(b). Density of proton is way way way smaller than Osminum

Ugggg.... this stuff is so hard to type which is why I asked a about a program in software part... maybe I should start trying to use word to do all this I just get slowed down a ton hunting for symbols!

Thanks,

Brian