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The sentence van has come. is grammatically correct if the noun van is the name of a person. A proper noun is not usually preceded by an article. If the noun van' is a common noun, a word for a … Friction and other factors will always prevent this to be 100% efficient, all input energy would need to be converted in to useful output energy. In any real engine, there will always be friction (since there will …

In any real engine, there will always be friction (since there will …