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# Question 4 A uniform bar of length \( l = 2m \) and weight \( W = 30N \) is inserted into an opening. The surfaces are smooth. The beam is in equilibrium. **a.** For what value of \( a \) is the normal force at point A zero? **b.** At that condition, what is the value of the horizontal force \(...

# Question 4 A uniform bar of length \( l = 2m \) and weight \( W = 30N \) is inserted into an opening. The surfaces are smooth. The beam is in equilibrium. **a.** For what value of \( a \) is the normal force at point A zero? **b.** At that condition, what is the value of the horizontal force \( F \)? **c.** For what value of \( a \) cannot the equilibrium of the beam be achieved? **d.** Determine the horizontal force when \( a = 0.5l \).