5. A 5 kg mass is located on a wedge angled 30 degrees above the horizontal, with a string connected to a scale as shown in the diagram below. The wedge is then rotated in a uniform circular motion around the axis shown in the diagram, and the scale reads a constant 30 N. The wedge/mass surface is friction-free, and assume the air resistance is negligible. Calculate the centripetal acceleration of the mass.
(a) 5.0 m/s^2 (b) 3.5 m/s^2 (c) 1.8 m/s^2 (d) 2.6 m/s^2