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давление на дно сосуда определяется формулой p=плотность*ускорение св. падения тел*высота

плотность керосина=800

ускорение св.п.тел g=9.8

высота h=0,5

p=800*9.8*0.5=  3920 па

f=iblsina=0.03тл*0.5м*12а*1=0.18н