A 500kg roller coaster moves over the top of a 15m hill while moving at a speed of 4m/s. How fast will the roller coaster be
moving when it reaches the bottom of the hill?

An asteroid is discovered in a nearly circular orbit around the sun, with an orbital radius that is 2.47 times earth's. what is the asteroid's orbital period, its "year," in terms of earth years?

Phase changes are chemical changes. true or false

Match these items. 1. coulombs __force 2. ohms __emf 3. centimeters __resistance 4. newtons __charge 5. volts __length