Mechanics module from Maths alevel. Three questions from the Statics of Rigid Bodies topic.

http://i18.photobucket.com/albums/b1...all/maths1.png

http://i18.photobucket.com/albums/b1...all/maths2.png

http://i18.photobucket.com/albums/b1...all/maths3.png

Any help would be appreciated. I've gathered that you have to use those horrible integral formulars and rho. xx