2. Stem-1: There forces acting at a point are in equilibrium. The angle between and is and that of and is .
Stem-2: A light rod of length rests horizontally on two pegs apart. The pressure on the two pegs are equal when the weights and are suspended from and respectively.
3. Stem-1: The vertex of a parabola is , axis is parallel to -axis and passes through the point .
Stem-2: The focus of an ellipse is , equation of the directrix is and eccentricity is .