ISH i need help with my homework...

[Jameerthefear]

Here is the question: The aluminum foil on a certain roll has a total area of 18.5m^2 and a mass of 1275g. Using a density of 2.7g/cc for aluminum, determine the thickness in millimeters of the aluminum foil.

[shaq2000]

mass = 1275g
density = 2.7g/cc
density = mass/volume
2.7g/cc = 1275g/volume
volume = 1275/2.7 = 472.2~cc
volume = area * thickness
472.2~ = 18.5m^2 * 10000cm^2/m^2 * thickness
thickness = 472.22cc/185000cm^2
thickness = 0.00255cm

[Jameerthefear]

thanks

[shaq2000]

No problem. I basically copy/pasted.

[Jameerthefear]

One question: where did you get this part?
10000cm^2/m^2 * thickness

[Kungfro]

One question: where did you get this part?
10000cm^2/m^2 * thickness

Converting the 18.5 m^2 into cubic centimeters.

[shaq2000]

One question: where did you get this part?
10000cm^2/m^2 * thickness

Area times thickness. The first part converts the square meters to square centimeters (10,000cm^2 = 1 m^2)

[RightToCensor]

You have homework? School isn't canceled by snow where you live.

[Angel Face]

I can help you, but your son needs to learn from his own.