A small block of mass \(m\) is placed on the inside surface of a frictionless, fixed conical funnel as shown. The axis of the funnel is vertical, and the apex (the bottom point) is at the origin. The surface of the funnel makes a constant angle \(\theta\) with the vertical axis. The block is given an initial tangential velocity such that it travels in a horizontal circle at a constant height \(h\) above the apex. Which of the following expressions represents the speed \(v\) of the block in terms of \(h\), \(\theta\), and fundamental constants?