A rectangle sheet of aluminum foilis 50 centimeters long and 20 centimeters wide, and weighs 5.4 grams. 6ind the thickness of the aluminum foil in centimeters.
D=2700kg/m^3*1000g/kg*(1/10^5)m^3/cm^3
D = 27g/cm^3.
V = 5.4g * (1/27)cm^3/g = 0.2cm^3.
50cm * 20cm * Xcm = 0.2cm^3,
1000x = 0.2,
X = 2*10^-4 = 0.0002.cm thick.