Making the world better, one answer at a time. The mass has no effect on the period of the pendulum. The period depends on the maximum speed at the lowest point and the maximum speed only depends on the height at the highest point.
These, as with most other Aztec sculpture, would have once been painted using a wide range of bright colours. Smaller scale sculpture has been found at sites across Central Mexico. These often take the form of local deities and especially gods related to agriculture. The most common are upright female figures of a maize deity, typically with an impressive headdress, and the maize god Xipe Totec.
The Eagle refers to the Aztecs. When the Aztecs were looking for a place to settle, they believed they should build their city where they encountered an eagle perched on a cactus with a snake in its talon. Where the Aztecs supposedly found this is now known as Mexico City. it means when the aztecs saw the eagle in their crops the symbol or sign to build their great city! There is an old myth about an eagle landing on a rock with a snake in it's beak. The Aztecs believed that this would show where to found their capital. Mexico City is today built on that very site.