A glass capillary tube has a diameter of 2.00 mm and contains a small amount of liquid that forms a concave spherical meniscus. A particle of the liquid located where the liquid surface meets the tube wall is subject to a cohesive force of 4.00 N at an angle of 18.0 ∘ to the wall and an adhesive force of 6.47 N.
What is the radius of curvature of the meniscus?