what will be the volume (in cubic metres) of a body of weight 500N and has a relative density of 0.5? factor30, i need a sexible...sorry...a sensible answer from u in particular...lol...

[titanium_micky]

[factor-fiction]

Mass = 500N ÷ g.
I'll use g (acc due to gravity) as 10 m/s² (change it to 9.8 if you prefer)
So mass = 50 (kilograms)

Density = mass ÷ volume, so volume = mass ÷ density
Volume = 50 ÷ 0.5 = 100 m³

Someone can check this

[factor-fiction]

Anyway, I thought you always answered your own questions straight after posting them.

[Helveticus]

Not quite, factor30. You correctly calculate the mass of the body as being around 50kg. However, the question specified that the *relative* density of the body is 0.5 i.e. its density is half that of water. The latter is ca. 1000kg/m³ . If we plug in the numbers, the volume of the body turns out to be 1m³ .

[Helveticus]

That should have read 0.1m³, not 1m³. Mea culpa.

[factor-fiction]

Well spotted- I thought it seemed a large volume.

[factor-fiction]

Are you trying to establish the volume of a person? 50kg is approximately the mass of an 11 year old child or a size zero model (are you one of these, titanium-micky?), but the relative density of the human body is 1.04.