Aperson struggles very hard to lift a large boulder. he puts in so much effort, he starts to sweat, his heart rate increases, and he gets really tired. all of his effort is for nothing, the boulder does not move at all. in this situation, has work been done? explain! *use the scientific definition of "work" to answer this question.

No, he did not perform any work. Work is when you’re using energy which results in a force. Even though he was tired and sweaty, he did not move the boulder. So therefore he did not perform any work.

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.

An atom that has fewer electrons that protons is called a positive ion.