21.) Explain: what happens to the kinetic energy of a skateboard that is coasting along a flat surface, slows down, and comes to a stop?

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

When the water vapor cools it condenses select a number that represents his process on the

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line