Final Answer:
The minimum coefficient of static friction required for the drum with a fixed inner hub is 0.5, ensuring it resists external forces and remains stationary without initiating motion.
Step-by-step explanation:
In simple terms, the minimum coefficient of static friction needed is 0.5. This means that to prevent the drum with a fixed inner hub from moving, the friction between the drum and its surroundings must be at least 0.5. If the coefficient of static friction is less than 0.5, the drum would start moving even under the slightest external force.
In practical terms, the coefficient of static friction is a measure of how much resistance there is to the initiation of motion between two objects in contact. For the drum scenario, a coefficient of 0.5 implies that the frictional force counteracts any force trying to move the drum until that force reaches half the weight of the drum. This balance ensures the drum stays in place.
Understanding this coefficient is crucial in engineering applications where stationary components, like the fixed inner hub of a drum, need to resist external forces. It ensures the stability and safety of structures and machinery, preventing undesired movements.