Avenn diagram of 2 intersecting circles with the left circle labeled weak nuclear force and the right circle labeled strong nuclear force. there is an x in the weak nuclear force circle. there is a z in the strong nuclear force circle. there is a y in the intersecting area. which labels belong in the areas marked x, y, and z? x: always attractive y: very small range z: attractive and repulsive x: attractive and repulsive y: very small range z: always attractive x: very small range y: attractive or repulsive z: infinite range x: infinite range y: attractive or repulsive z: very small range

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

Current supplied to consumers from generating plants like coal power plant, nuclear power plant, geothermal and others are in form of alternating current instead of direct current because it can be transported easily in a long distance. also, the alternating current has a wide range of frequency and the amount or energy can be increased or decreased.