In uniform circular motion, total acceleration of an object in a circular path is equal to the radial acceleration. Due to the presence of tangential acceleration in non uniform circular motion, that does not hold true any more. To find the total acceleration of an object in non uniform circular, find the vector sum of the tangential acceleration and the radial acceleration.
Pyrite is a polymorph of marcasite, which means that it has the same chemistry, FeS 2, as marcasite; but a different structure and therefore different symmetry and crystal shapes. Pyrite is difficult to distinguish from marcasite when a lack of clear indicators exists.
Iron pyrite is too hard for a knife blade to affect, but pure gold is soft and will show a scratch. Hit the specimen with a hammer. If you strike a piece of pyrite against hard metal or flint, you will get a spark. This well-known quality gives the mineral its name -- pyrite is Greek for of fire. Real gold will produce no sparks and should flatten under the hammerâs force.