Homework Help: physics

Posted by Anonymous on Thursday, January 20, 2011 at 10:25pm.

To determine the density of block of aluminum, you measured the mass at 101.1 g and a volume of 38.2 cm3 . When you looked up the value for aluminum density you found out it should be 2700 kg/m3 What is the percent error for your experimental data?

a) 1.98%
c) 19.8%
b) 0.198 %
d) cannot determine

physics - Henry, Saturday, January 22, 2011 at 7:23pm
101.1g = 0.1011kg,

V = 10^-6m^3/cm^3 * 38.2cm^3 =
38.2*10^-6m^3.

Density = 0.1011kg / 38.2*10^-6m^3 =
2.6466*10^-3 * 10^6 = 2647kg/m^3.

Error = 2700 - 2647 = 53kg/m^3.

%Error = (53/2700) * 100% = 1.96.

ans. = a.

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