Final answer:
To calculate the second principal plane relative to the front surface, resolve the forces into components perpendicular and parallel to the surface, calculate their magnitudes, and determine the direction of the resultant force.
Step-by-step explanation:
To calculate the second principal plane relative to the front surface, you need to follow these steps:
- Resolve the forces acting on the object into components that are perpendicular and parallel to the surface of the plane.
- Calculate the magnitude of each component using the given equations and information.
- To obtain the direction of the resultant force, measure the angle it makes with the reference frame using a protractor or use trigonometric relationships.