The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10^-6m³m of water is made of

mimifav247

1 year ago

When an object is immersed in water, it displaces a volume of water equal to its own volume.
The volume of water displaced= upthrust


relative density= mass of substance/mass of equal volume of water

density of water=1000kg/m3
mass of equal volume of water= 50*10^-6 * 1000=0.05

Relative density= 0.425/0.05
=8.5


note= density and relative density are not the same. RD has no unit while density has a unit of kg^m3
Another name for relative density is specific gravity


density of water=1000kg/m3 or 1g/cm3. notice the units

medben

1 year ago

R.d = mass of substance/
Mass of equal volume of water
R.d = 0.425/50x10^-6
R.d = 8.500
8.5 is for brass

LadyZara

3 years ago

please i dont understand the explanation.

Queennette2

3 years ago

Myschool please correct your explanation

The second line

Jibola11

3 months ago

hmmm