A uniform metal bar with mass and length is connected to a wall by a pivot joint. It is held in place by an ideal thin cable (no effective mass or elasticity) connected to the wall above the pivot, so that the cable makes a angle with the metal bar. What is the tension in the cable?
2
A child sits on one end of a seesaw. How far from the pivot point should a rock of be placed on the other side of the seesaw in order to perfectly balance the child and rock?
