An extendable pole that is 4 m in length is placed against a smooth, vertical surface. The static friction coefficient between the pole and the ground is 0.50. Calculate the smallest angle the pole can form with the ground to stay in position without sliding.

What is the minimum angle the rods can make to the surface and still not fall when two identical rods are set up symmetrically against each other on a surface with a coefficient of friction 0.51?