Which best describes protein

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

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.

What does si stand for,when referring to a system of measurement