Chronic alcoholism induces renal tubular dysfunction leading to loss of renal Magnesium called Hypomagnesemia. This state often induce peripheral resistance to parathyroid hormone leading to hypocalcemia (reduction of calcium). There is equally loss of or reduction in gastrointestinal absorption causing reduction in phosphate. Magnesium reduction also contribute to reduction in potassium. The reduction in magnesium has been attributed to dysrhythmias
The battery is an electric energy source, which is being used to power a motor. The motor turns this electricity into kinetic energy as it spins the fan, creates heat from friction, and creates noise as stated by the problem.
We divide the thin rectangular sheet in small parts of height b and length dr. All these sheets are parallel to b. The infinitesimal moment of inertia of one of these small parts is where Now we find the moment of inertia by integrating from to The moment of inertia is (from (-a/2) to (a/2))
to 
(from (-a/2) to
(a/2))