A constant-head permeability test results are as follows:- Specimen length, L = 30 cm- Area of the specimen, A = 177 cm2- Constant-head difference, h = 50 cm- Water collected in a period of 5 min = 350 cm3Calculate the hydraulic conductivity (permeability) in cm/sec

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

conservation of mass

mass before something happens = mass afterwards