Recent content by Chavers

http://www.csun.edu/~ml727939/coursework/695/floating%20needle/floating%20needle.htm This link doesn't include the use of grease but it does explain why dunking needle causes it to sink

Air doesn't all sink to the ground for the same reason you don't. Gravity on Earth isn't strong enough to compact it that much. The layer of atmosphere we live in is made up of gasses that weigh more than those in higer layers. If Earth's gravity was that strong the Earth would be a star...

A clue to help you. The egg has to be boiled and once it is the yolk is fixed to the larger section of the egg and there an air pocket in the smaller end so it's center of gravity isn't where it appears. If you were capable spinning a top fast enough that's laying on its side it will stand up...

Based on personal experience. If you dunk a greased object in water and remove it some of the grease will remain in the water. The amount grease removed from the object will differ depending on the temperature of the water and length of time submerged.

Regardless if the bag is opened or not the air inside has weight but as already stated psi inside and outside the bag are equal but the weight can be determined by zeroing a scale inside a vacuum then weighing a sealed bag of air in the vacuum. Zero the scale in a vacuum then bringing it into...

The grease doesn't have a strong enough bound to maintain its shape and volume under water. If the grease isn't evenly distributed it will tip to the heaviest side down. This will put the needle below the surface of the water which will increase grease removal so if the needle returns to water...

The needle will eventually sink because it's in a suspension that's floating on the water, sinking it will speed the process by decreasing the surface area of the grease, as well as move it away from the center of the suspension obviously the needle will sink. I can't think of a way to...

I incorrectly stated above in an attempt to make the reply as short as possible. The point I was trying to make is any object less buoyant than geese will float higher in water when greese is applied. The grease increases the surface area of the ducks feathers while trapping air without...

The oil does more than prevent saturation and ducks are more evolved than simply they float because they're birds. They are able to change the buoyancy using air sacks and there lungs

I'm not in a physics field, I'm just a very curious person.

A lump of grease will sink in water but if flattened out enough it will float same as oil. Covering a needle with it creates enough surface area that the weight of the needle isn't enough to counter act the buoyancy of the geese. Basically the same way ducks float above water due to there oily...