A stationary 3.0-m board of mass 7.0 kg is hinged at one end. A force F is applied vertically at the other end, and the board makes a 30° angle with the horizontal. A 65-kg block r on the board 80 cm from the hinge as shown in the figure below. 80 cm (a) Find the magnitude of the force F. (b) Find the force exerted by the hinge. (c) Find the magnitude of the force F as well as the force exerted by the hinge (FH), if F is exerted, instead, at right angles to the board. eBook

A stationary 3.0-m board of mass 7.0 kg is hinged at one end. A force F is applied vertically at the other end, and the board makes a 30° angle with the horizontal. A 65-kg block r on the board 80 cm from the hinge as shown in the figure below. 80 cm (a) Find the magnitude of the force F. (b) Find the force exerted by the hinge. (c) Find the magnitude of the force F as well as the force exerted by the hinge (FH), if F is exerted, instead, at right angles to the board. eBook