determine how high above the surface of the Earth you could stack basketballs one layer thick for Avogadro’s number of basketballs

it is easily magnetized.

no simpler subs form complex ones. synthesise = make

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.