Why the needle of iron swims on Water surface when it is kept gently ? (a)It will remain under the water when it will displace more water than its weight (b)the density of needle is less than that of water (c)due to surface tension (d)due to its shape
Option C. According to Archimedes precept and we will word that the quantity of water displaced through a needle is lesser than the quantity of water moved out through the needle (this is displacement of the needle). So the needle to start with remains at the floor of the water after which sinks into the water. Surface anxiety is a contractive tendency of the floor of a liquid that lets in it to withstand an outside force. It is revealed, for example, withinside the floating of a few items at the floor of water, despite the fact that they're denser than water, and withinside the capacity of a few insects (e.g. water striders) to run at the water floor. This belongings is resulting from brotherly love of comparable molecules, and is accountable for among the behaviors of liquids.
