Explain how water changes state using physical changes. Are there the same number of water molecules after the change?
How does this prove the Law of Conservation of Mass?

Which term best describes the phrase “something that happens”?

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Most short-period comets do not have randomly oriented orbits because