Can someone help me with this problem?

Question

an iron anchor weighs 250 pounds in air and has a weight density of 480 lbs/ft^3. if it is immersed in sea water that has a weight density of 64 lbs/ft^3, how much force would be required to like it while it is immersed?

Answer 1

About 217 pounds.

Answer 2

if your asking about anchors for pleasure boats that's way too much weight ,a good medium size danforth will do well, if you know how top use it.

Answer 3

Use Newton's gravity law. There must be a formula to solve this. I took physic course in HS, but I forgot some. However, this is all about gravity. Use gravity equation and figure it out.

Answer 4

250 lb is a bit much. but 25 pound is a bit more managable

get a 25 pound anker and a bathroom scale that works under water and head for the ocean and try it out .

Answer 5

work out the anchors volume of displacement,convert that with the density of the water that it's in and take that off the weight of the anchor. that's how much force it would take to lift it. Hope this helps

Answer 6

250lbs. Even if it did weigh less under water(it doesn't because it has no buoyancy at all) as soon as it broke the surface it it would be 250lbs.