Math Is Fun Forum

dadon

Member

Registered: 2006-04-12

Posts: 14

proof question.

Hey guys,

Needed some help on 2 proof questions:

1) Prove that the centre of mass of a uniform wire in the form of a semi-circle of radius r is at a distance 2r/pie (sorry don't know how to insert symbol) from the centre.

2) Prove that the centre of mass of a uniform semi-circular laminar of radius r is at a distance 4r/3pie from the centre.

I hope you guys can help. Thanks

kind regards,

dadon

pgonzales

Member

Registered: 2006-04-21

Posts: 1

Re: proof question.

In a FY 2/03 budget, directed projects amount per contract were $250,000.  In Fy 03/04, this amount increased to $287,500.  What is the amount of the increase?

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: proof question.

pgonzales,
the amount of increase in percentage is

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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dadon

Member

Registered: 2006-04-12

Posts: 14

Re: proof question.

lol stole my thread!

dadon

Member

Registered: 2006-04-12

Posts: 14

Re: proof question.

Still having promblem with the proof questions! I would be greatly if someone can help

Kind Regards,

dadon