Diposit de aigua amb aisheta:
m·( y·d_{t}[y] )^{2} = qg·(y·pi·r^{2})
y(t) = ( (3/2)·( (q/m)·g·pi·r^{2} )^{(1/2)}·t )^{(2/3)}
mànega pastelera:
m·( y·d_{t}[y] )^{2} = qg·(y·pi·r)
cadena del váter:
m·( x·d_{t}[x] )^{2} = qg·(x^{2}·a)
globus:
m·( r·d_{t}[r] )^{2} = qg·( (4/3)·pi·r^{3} )
r(t) = ( (1/2)·( (q/m)·g·(4/3)·pi )^{(1/2)}·t )^{2}
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