Problem 1.364

The rod \(A B\) oriented parallel to the \(x^{\prime}\) axis of the reference frame \(K^{\prime}\) moves in this frame with a velocity \(v^{\prime}\) along its \(y^{\prime}\) axis. In its turn, the frame \(K^{\prime}\) moves with a velocity \(V\) relative to the frame \(K\) as shown in Fig. \(1.94 .\) Find the angle \(\theta\) between the rod and the \(x\) axis in the frame \(K\).