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## Homework Statement

A popular brand of doughnut is made in an assembly-line fashion. First, the white, uncooked doughnut is dropped into hot vegetable oil ( ρ= 949 kg/m

^{3}) where it browns on one side as it cooks. It is then flipped over and browned on the other side. The final product still has a white stripe around the middle where the dough always stays out of the oil, as indicated in the figure .

Assuming the doughnut has a cylindrical shape of height

*H*and diameter

*D*, and that the height of the white stripe is 0.25

*H*, find the density of the doughnut.

## Homework Equations

F

_{buoyant}=[tex]\rho[/tex]Vg

F

_{buoyant}=weight of doughnut

[tex]\rho[/tex]=M/V

V

_{submerged}=V

_{doughnut}([tex]\rho[/tex]

_{doughtnut}/[tex]\rho[/tex]

_{oil})

## The Attempt at a Solution

I have not idea where to start.. the only conclusion I have come to is that the doughnut it floating so it's density has to be less than oil.

I know i must use most of these equations but I'm confused on which ones to use, considering i don't have numbers to plug in.

The whole white line in the center is throwing me off...