Buoyant forces and temperature

[kmkindig]

I was just looking through an internet site and there was this question... Will the buoyant force acting on on aluminum sphere submerged in water increase or decrease if the temperature of both is increased. Why? This question just sparked my interest because i am not a physics major but now a little about physics and didnt know the answer. Thanks!

 

[Bob S]

If the volummetric expansion of the aluminum is the same as the density decrease of the water, then there is no nearly no change in the buoyancy, because the buoyancy force F is equal to the mass of the water M the sphere displaces minus the mass of the sphere m, times g: F = (M-m)g.

 

[kmkindig]

Hey that helps out a lot! Thank you very much and that conquers my curiousity. Thanks again