Lever force F at a point "A" located by the coordinate vector r on the bar. The lever then exerts an output force F at the point "B" located by r. The rotation of the lever about the fulcrum "P" is defined by the rotation angle "θ" in radians. Let the coordinate vector of the point "P" that defines the fulcrum be r, and introduce the lengths which are the distances from the fulcrum to the input point "A" and to the output point "B", respectively. Now introduce the unit vectors e and e from the fulcrum to the point "A"
Évelyne Lever specifically for an American audience. She continues to write on and about 18th-century history. French English Évelyne Lever Évelyne Lever (known simply in English as Evelyne Lever) is a contemporary French historian and writer. She was married to a French historian, Maurice Lever, who is the author of "Sade". Lever was previously a research engineer at CNRS, and then began to focus more on 18th-century history. In particular, she focuses on certain people, including Louis XVI, Marie Antoinette and Madame de Pompadour. "Marie Antoinette: The Last Queen of France" was her first book to be published in the United States.