A mobile at the art museum has a 2.0 kg steel cat and a 4.0 kg steel dog suspended from a lightweight cable, as shown in the figure.

A mobile at the art museum has a 2.0 kg steel cat and a 4.0 kg steel dog suspended from a lightweight cable, as shown in the figure. It is found that theta = 20 when the center rope is adjusted to be perfectly horizontal. What is the tension and the angle of the rope 3?