A 2.0 m wooden plank of weight 100 N is hinged to a wall at its left end and held horizontal by a vertical cable attached at the right end. A 300 N box initially rests 1.5 m from the hinge, and the system is in rotational equilibrium.
The box is suddenly slid so that it is only 1.0 m from the hinge. To restore rotational equilibrium after the slide, what must be the new tension in the cable?
a) 275N
b) 150N
c) 200N
d) 175N