1.An area that varies in elevation from 463ft - 634ft is being mapped. What contour intervals will be drawn if a 50ft interval is used? Which lines are emphasized?
2.Two identical uniform boards, each of weight 40lb, are temporarily leaned against each other as shown. Knowing that the coefficient of static friction between all surfaces is 0.40, determine
(a) the largest magnitude of force P for which equilibrium will be maintained,
(b) the surface at wich motion will impend.