Math Is Fun Forum

sharpy74

Member

Registered: 2009-06-01

Posts: 3

HELP needed ASAP: Density of the material

I have a question i am stuck on please could any one help

A solid cylinder 350mm in diameter and of total length 750mm floats upright in fresh water to a deoth of 500mm. (Need working out)

Determine the density of the material in the cylinder

Last edited by sharpy74 (2009-06-01 05:40:41)

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: HELP needed ASAP: Density of the material

The cylinder displaces an amount of water that weighs the same as itself.
The water displaced fits into a cylinder with diameter 350mm and height 500mm, which has 2/3 the volume of the cylinder in the question.

Water has density 1000 kg/m³, so for the weights to match, the cylinder must have density ~667 kg/m³.

---

Why did the vector cross the road?
It wanted to be normal.

sharpy74

Member

Registered: 2009-06-01

Posts: 3

Re: HELP needed ASAP: Density of the material

Thanks but could you tell me what equation you used to find the answer please

1a2b3c2212

Member

Registered: 2009-04-04

Posts: 419

Re: HELP needed ASAP: Density of the material

Density=Mass/Volume

Volume of cylinder=πr²h     where π= pi (3.141.....), r= radius, and h= height

Hope that helps.