Physics

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A 215 g particle is released from rest at point A (the middle of one side) inside a smooth hemispherical bowl of radium 30.0 cm. Calculate the gravitational potential energy at A relative to B. (B is in bottom-middle of the bowl)

Ok, so PE_g=mgh. How would I find the height of A? If necessary, I could scan the diagram shown in the book.

PS I'm still stuck on my other question if you have time :)

What is the radius? It is a hemisphere.

ok, I made a similar image on paint

img71.imageshack.us/ img71/1637/mathga5.png

now, the distance from A to B is not the same as the radius, right?

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