in order to see the moon in the same position two nights in a row the earth must rotate for a day plus (blank)

it may be wrong but i think its a

b.

hope this : )

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.