TOLC med 2011 buoyancy force

[Juliette]

hi

can anyone find 90N and 30N?
i’m having issues with the units since F = kg * m * s⁻² and we have the height in cm and area in cm²

[nihantokar]

here is how I solved it, don’t mind the blue part I couldn’t erase it ahahha

[Aung_Htet_Thar]

U can simply use the F = rho V g equation too

[nihantokar]

what is the rho in the equation? ik i solved it in a way longer way but i couldn’t remember this one for sure

[Aung_Htet_Thar]

It’s density.
Pressure = F/A
Or for liquid it’s
P = density(rho) g h
F/A = rho g h
F= rho g Ah
F = rho V g then

[Aung_Htet_Thar]

For cylinder, F = rho V g
For cone, F = rho V/3 g