A ball is rolling up and over a hill. The ball slows down as it moves from Position 1 to Position 3. and it speeds up as it moves from Position 3 to Position 5. When is the gravitational potential energy of the ball being transformed into motion energy (kinetic energy)?

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.