The 300-mm uniform rod BD of mass 3 kg is connected as shown to crank AB and to collar D o...

The 300-mm uniform rod BD of mass 3 kg is connected as shown to crank AB and to collar D of negligible mass, which can slide freely along a horizontal rod. Knowing that crank AB rotates counterclockwise at the constant rate of 300 rpm, determine the reaction at D when θ = 0.