Discussion
The coefficient of static friction between grain and a wall surface governs
Answer: A
Correct answer: The wall loads in a storage bin
Grain in a deep bin does not press on the floor with its full weight. Friction between the grain and the wall transfers part of the load into the wall itself, and Janssen's analysis makes the coefficient of static friction the parameter that governs how much.
The consequence is practical: a smooth steel bin and a rough concrete one of identical dimensions carry different vertical wall loads with the same grain, and the floor pressure reaches an asymptote rather than growing without limit as the bin is filled. Terminal velocity is aerodynamic, and specific heat and equilibrium moisture content are thermal and hygroscopic properties, none of which enters the wall-load calculation.
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