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allykat
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Homework Statement
A solid sphere of aluminum (density 2.7 g/cm^3) is gently dropped into a deep ocean. (The density of ocean water is approximately 1.03 g/cm^3.) Calculate the sphere's acceleration at the point where it is completely submerged into the ocean. As the sphere drops deeper, does the acceleration increase or decrease compared to the acceleration beneath the surface?
Homework Equations
Knowing that density = ρfVfg and that mg is greater that this, the Fnet equation becomes
Fnet= mg-ρfVfg where the volume is also the volume displaced by the sphere
The Attempt at a Solution
Okay so I attempted to find the ratio of Wapp/Wactual which is Vsphere(ρsphere-ρwater)g/Vsphere(ρsphere)g so I could find a relation between the two such that I could find m in the Fnet equation, but I couldn't get really far with this approach. I know the acceleration changes though.