Arock with a volume of 4.5cm3 has a mass of 15.0g. what is the density of the rock?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.