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A month is a unit of time, used with calendars, which was first used and invented in Mesopotamia, as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months are synodic months and last approximately 29.53 days.

Explanation:

It comes from the word "moon" and it is because it takes a full moon cycle around the earth to complete a month, around 30 days

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

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.