Chapter 4, Problem 57P

Determine the moment of the 80-lb force about the Oa axis. Express the result as a Cartesian vector. C 5 ft 30° 4 ft B 30° 45° 80 lb 6 ft 60° 120°

The force of F = 80 lb acts along the edge DB of the tetrahedron. Determine the magnitude of the moment of this force about the edge CA. If the moment of the force F about the edge CA of the tetrahedron has a magnitude of M = 200 lb-ft and is directed from C toward A, determine the magnitude of F. D 5 ft A F 15 ft 8 ft 10 ft 4 ft B

The chain AB exerts a force of 20 lb on the door at B. Determine the magnitude of the moment of this force along the hinged axis x of the door.