Hello the text is in swedish but ill try my best to translate,
What it says is:
Determine the resultant force on the moon with regard to thr gravitation force from the sun and the Earth when it's in this position shown in the figure [ picture http://m.imgur.com/AfJOVZo ]
J represents Earth and M represents the moon, i hope you can help me! I will be very grateful if you do!
I tried 9.82 x 1/81 (moon weight to earth) but it was wrong!
It has to do with Newtons laws though (9.82 for Earth gravity force)