Find forces that act on parts of standard sewing machines
What are the forces that act on parts of the standard sewing machines. What other physic mechanisms are involved in a sewing machine?
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A thin film of alcohol lies on a flat glass plate. The reflected light is a minimum for 496 and a maximum for 620. What is the minimum thickness of the film?
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What would have happened if the Persians had defeated the Athenians and Spartans when they invaded Greece? What long term effects would be noticeable in the history of western civilization?
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