I had an aluminum slug that I measured the mass of as 8.669g.
The length was 2.8cm
The radius was .950 cm
The volume (using a volumetric cylinder) was 3.5cm^3^. We are supposed to do a calculated volume using (pi*r^2^*h) also..but when I do it with the formula, it doesn't come out the same both ways. I think I'm following everything, but it's just not coming close to being equal. Am I doing something wrong, or did we (more than likely) not measure something right?
2006-09-14 14:17:33 · 5 answers · asked by buttercup1137 2 in Science & Mathematics ➔ Mathematics
Yes, I was trying to make absolutely sure it wasn't just me before I went to redo it. :)
Oh, and the only reason why I included the mass is that I was including everything we performed in the lab-- I try to always give all the info; I knew it didn't have anything to do with the calculation. :)
2006-09-14 14:46:55 · update #1
Measurments, almost never 100% with predicated values from formulas but these numbers are way off you must have measured something wrong. I get about 7 cm^3 when uing the formula and baout 23.4 cm^3 when using density and mass, so either the shape was not a true cylinder, you measured wrong, or it was not true solid aluminum
2006-09-14 14:26:50 · answer #1 · answered by abcdefghijk 4 · 0⤊ 0⤋
If you are "not coming close" then there must be an error either in the way the measurement was made or your calculation. My calculation based on your numbers is a volume of 23.4 cm^3. It appears that something in your measurement is not right, and it's not just typical measurement error.
2006-09-14 21:24:46 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
You probably didn't measure correctly because I got this weird number, and I know that is the correct formula... Also you didn't have to include the mass and it just made me go crazy...
That's okay, though...
sooooo
my point is that you didn't measure something correctly
2006-09-14 21:28:40 · answer #3 · answered by Sarah K 1 · 0⤊ 0⤋
because the slug is not a perfect cylinder...
that formula works for a perfect cylinder only...
2006-09-14 21:26:19 · answer #4 · answered by yekis 2 · 0⤊ 0⤋
Welcome to the world of errors in measurement.
There are errors in the length and radius - those errors propagate to the volume.
2006-09-14 21:19:17 · answer #5 · answered by Anonymous · 0⤊ 0⤋