How much work is done by the gravitational force when a 265-kg pile driver falls 2.80m?

The four giant gas points that are made primarily of lightweight elements are

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

What was the first instrument to ever record an earthquake?