Ascallop forces open its shell with an elastic material called abductin whose elastic modulus is about 2.5× 10% n/m2 . if this piece of abductin is 3.0 mm thick and has a cross sectional area of 0.50 cm2 , how much potential energy does it store when compressed 1.0 mm?

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.