- #1

WhoThat3

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## Homework Statement

Info on object:

Mass = 10kg

Radius = 0.20m

Lenght of spouts = 0.10m above surface of sphere. (The two spouts can be considered massless.)

The sphere is hollow and looks like this. The pressure inside is 1.5 atm and the pressure outside is 1.0atm.

http://upload.wikimedia.org/wikipedia/commons/3/3e/Aeolipile_illustration.JPG [Broken]

a) Find moment of inertia (found)

b) What is the angular acceleration of the container? Take the area of the spouts to be circles of radius 0.010m.

## Homework Equations

Not sure, but I used Pascals principle.

Bernoullis came to mind, but I doubt it.

## The Attempt at a Solution

a) I = 2/3*MR^2 = 0.26...

I = 0.27

b) Pout = Pin(not sure since this is not true since pressure inside is 1.5atm pressure outside is 1.0atm)

Fout/Aout = Fin/Ain

Fout/(pi*r^2) = 1.5atm/(pi*r^2)

Fout=1.5atm

1.5atm = 151950 N/m^s

This is a tangental force.....

F=mra (a is alpha, angular acceleration; r+lenght of spouts)

a=F/(mr)

a=50650???

Does not look right

I am a bit confused on what to use for part b of this question. I do not think that my result is accurate. Any advice would be appreciated or any pointers.

Thanks

edit: Also anyone know how to find the energy stored by the steam inside the container??

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