proteoglycans are part of the extracellular matrix; they provide structure, viscosity and lubrication, and adhesiveness. they are composed of proteins conjugated to carbohydrate components called glycosaminoglycans. the glycosaminoglycan component makes up the majority of the mass of a proteoglycan.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.