Question

please try to find "m" .................

Answer 1

in question it is given that
thita = √(3rt/m)

let thita =@

so
@^2=3rt÷m

so,
m = 3rt ÷ @^2............answer


note here,
@=thita that is given in question
^= raise to

Answer 2

See the attach file for ans