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 one year ago
A smooth surface of revolution is hyperbolic with equation z=a^2/r, the axis Oz pointing vertically downwards and r, θ and z being cylindrical polar coordinates. A small particle mass m slides on the interior of the surface. Calculate potential energy.
 one year ago
A smooth surface of revolution is hyperbolic with equation z=a^2/r, the axis Oz pointing vertically downwards and r, θ and z being cylindrical polar coordinates. A small particle mass m slides on the interior of the surface. Calculate potential energy.

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theEric
 one year ago
Best ResponseYou've already chosen the best response.0I'm not sure if I can help, but here are my thoughts that you and others can dispute. Is this potential energy just the potential energy due to gravity? It looks like mass is the only data on this particle. Then \(E_{potential}=m\ g\ z\) if you consider the particle to have \(0\ [J]\) at \(z=0\). And \(a^2\) and \(r\) are unknown? Then the potential energy could not be known, but could be put in terms of \(a\) and \(r\).

theEric
 one year ago
Best ResponseYou've already chosen the best response.0As for the surface, I guess \(a^2\) is constant and so we'd have a surface likedw:1374850120317:dwIt's inside that, on the interior, I guess. That is because it is a hyperbola whose \(z\)value does not depend on \(\theta\), but only \(r\). So \(\large z=\frac{a^2}{r}\) at every value for \(\theta\) in those cylindrical coordinates.
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