A type of firework is made by connecting two rockets, facing in opposite directions, to a rod, as shown.
The rod is attached to a frictionless pivot so that the firework can rotate in a vertical plane.
The firework has weight $W$. The pivot exerts a force $R$ on the rod that is equal and opposite to $W$.
Each rocket exerts a force of magnitude $F$ on the rod at a perpendicular distance d from the pivot. The forces exerted by the rockets are always in opposite directions.
Air resistance is negligible.
Which statement is correct?
1 )
The firework is in equilibrium because the resultant force acting on it is zero.
2 )
The firework is in equilibrium because the resultant torque acting on it is zero.
3 )
The firework is not in equilibrium because the resultant force acting on it is not zero.
The firework is not in equilibrium because the resultant torque acting on it is not zero.
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