Adriller is pulling on a stuck drillstring. the derrick is capable of supporting a maximum equivalent derrick load of 500,000 lbf, the drilling line has a strength of 51,200 lbf, and the strength of the drillpipe in tension is 396,000 lbf. if eight lines are strung between the crown block and traveling block and safety factors of 2.0 are required for the derrick, drillpipe, and drilling line, how hard can the driller pull trying to free the stuck pipe?

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?