Science- physics

posted by Hannah

An iron anchor weighs 250 pounds in air and has a weight density of 480 lbs/ft3. If it is immersed in sea water that has a weight density of 64 lbs/ft3, how much force would be required to lift it while immersed?

I know the answer is 217 pounds but I need help on trying to get that! Thanks <3

1. Sonam

An aluminium bar weighs 17 kg in air. How much force is required to lift the bar while it is immersed in gasoline? The density of aluminium is 170 kg m-3 and that of gasoline is 42 kg m-3.

Volume of aluminium=(mass of aluminium)/(density of aluminium)
=17/170=0.1〖 m〗^3(volume of aluminium is equal to volume of gasoline displaced)
Buoyant force = ρgV
= 42×10 × 0.1
= 42 N
Therefore, force required to lift = Actual weight – Buoyant force
= 17 ×10-42
= 170-42
= 128 N

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