A plane leaves Texas and travels a distance of 500 kilometers in 3,600 seconds. What is the average speed of the plane?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

With i really need the correct answer!

A10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. which one has the greater buoyant force on it? explain. b - the aluminum a) both have the same buoyant force. b) the aluminum c) the lead d) it cannot be determined without knowing their volumes.