Philippines
June 18, 2007 6:34am CST
Find the mass of a piece of gold leaf 2x10^-5 cm thick and 1.0 m^2 in area. The mass density of gold is 1.93 x 10^4 kg times m^2 this symbol ^=raised to the power thanks
2 responses
• United States
18 Jun 07
The phrase "the mass density of gold is 1.93 x 10^4kg times m^2" is confusing. I assume you're refering to density and not mass. And the units should be mass divided by volume (kg/m^3) not (kg*m^2) as you have written. If my assumptions are right the answer Rakhii got is correct.
1 person likes this
@rakhii (1302)
• India
19 Jun 07
Ya, the density is always kg/m^3 and not kg/m^2. I hope the answer is right.
@rakhii (1302)
• India
18 Jun 07
Density = Mass/Volume Mass = Density x Volume Volume = Area x Height = 2x 10^-5 cm x 1 m^2 = 2 x 10^-7 m x 1m^2 (1m = 100cm) = 2 x 10^-7 m^3 Now, mass = 1.93 x 10^4 kg/m^3 x 2 x 10^-7 m^3 Therefore, mass = 3.86 x 10^-3 kg Mass = 3.86 g (1000g = 1kg) Note : Density = kg/m^3 not kg/m^2 I hope the answer is correct. You can please recheck.
1 person likes this
• Philippines
18 Jun 07
thank you really for this too..thanks! 