Problem 9 friction wedges, wedge at inclined surface, Engineering mechanics

Find out the applied force P required to start the wedge as shown in diagram . The angle of friction for all surfaces of contact is 15°

Please refer my following Playlists , Links are given:
1. Theory of Machines or Kinematics of Machines play list

2. Fluid mechanics and Hydraulic machines playlist

3. Refrigeration and air conditioning playlist

4. Renewable Energy engineering or Non-convensional energy sources play list

5. Dynamics of Machinery play list

6. Engineering graphics or Engineering drawing play list

7. Engineering Mechanics Playlist

8. Power plant engineering play list

9. Engineering Thermodynamics play list

10. Heat and mass transfer play list

11. Operation research play list

12. Strength of material playlist

13. Control Engineering/ Control systems engineering playlist