Problem H01-01 (Points: 1/3) A steel tank is to be positioned in an excavation. Knowing that a = 20, determine by trigonometry: (a) [Points 0.5/3] the required magnitude of the force vector P if the resultant vector R of the two forces applied at A is to be vertical, (b) [Points 0.4/3] the corresponding magnitude of R. 425 lb P A 30