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"
Lever House project included the addition of marble benches and an Isamu Noguchi sculpture garden to the building's plaza – elements in the original plans for the building which were never realized. In 2003, Lever House Restaurant became the first business to operate as a restaurant at Lever House and later won "New York Magazine"'s Best Service award in 2004. Lever House Restaurant closed in early 2009. As of October 2009, restaurant Casa Lever occupies the former Lever House Restaurant space. Aluminum producer Alcoa is headquartered in Lever House. As of 2005, the building's tenants included Thomas Weisel Partners LLC, which maintains