A block of weight 20.0 N sits on a frictionless inclined plane, which makes an angle 29.0 with respect to the horizontal, as shown in the figure. A force of magnitude 9.70 N, applied parallel to the incline, is just sufficient to pull the block up the plane at constant speed. The block moves up an incline with constant speed. What is Wg, the work done on the block by the force of gravity as the block moves a distance 4.60 m up the incline?

Express your answer in joules to three significant figures.