A box of mass 1.0 kg sits atop a frictionless surface inclined at 30 degree above the horizontal. It is connected on its left side by a massless cord to a box of mass 3.0 kg on a horizontal frictionless surface through a massless and frictionless pulley. A horizontal force of 2.3 N is applied to the 3.0 kg box in the positive direction.
What is the tension of the cord?