Masses of 2 kg and 4 kg are attached to opposite ends of a uniform horizontal 3.0 m long beam. At what point along the beam should a single support be placed for the beam to be in equilibrium? What...

Masses of 2 kg and 4 kg are attached to opposite ends of a uniform horizontal 3.0 m long beam. At what point along the beam should a single support be placed for the beam to be in equilibrium? What will be the reactive force at the support? Neglect the mass of the beam.