The resonance frequency f of a closed air column is known to depend on the pressure p and density d of the air and length l of the air column. how are these quantities related?

Could someone . i have tried to solve myself but my calculation is off

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?