Spencer Pulley Spencer Pulley Spencer Kyle Pulley (born April 3, 1993) is an American football center for the New York Giants of the National Football League (NFL). He played college football at Vanderbilt. He was signed by the San Diego Chargers as an undrafted free agent in 2016. Pulley attended Evangelical Christian School in Cordova, Tennessee. While there, he was a three-year starter at offensive tackle and defensive end on the football team as well as lettering three times in shot put and discus throw in track & field. As a defensive end he recorded 29 tackles and 11 quarterback sacks. As
Block and tackle more precise estimate of efficiency is possible by use of the sheave friction factor, formula_12 (which may be obtainable from the manufacturer or published tables). The relevant equation is: Typical formula_12 values are 1.04 for roller bearing sheaves and 1.09 for plain bearing sheaves (with wire rope). The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary to pull 6 metres of rope through the