Early in the Earth's history, its surface was covered with an ocean of molten rock. Over time, the molten rock cooled to form a solid crust.

Of the following processes that can be observed today, which is most similar to the formation of Earth's early crust?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

An object's buoyant force and weight mean the same thing.a. trueb. false

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?