How about this? It's about calculations
By lonely_f16
@lonely_f16 (2146)
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
@celestemichelle (429)
• 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
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.
