[/caption]Most of the Earth surface, about 70%, is covered with water. The remaining 30% is made up of the seven continental landmasses. Underneath the water that fills the oceans, and the dirt and plants that cover the continents, the Earth's surface layer is made of rock.
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This shows that the length of a pendulum that makes one full swing in 2.2 seconds is 392.71 feet.
Given the formula for calculating the length of the pendulum expressed as:
where:
L is the length of the pendulum
T is the period of the pendulum
Given the following parameters:
Period T = 2.2 seconds
Substitute the given parameters into the formula will give;

So, this shows that the length of a pendulum that makes one full swing in 2.2 seconds is 392.71 feet.
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No net force acts on it.example is the earth
That is type of substance which produce magnetic field
(Example: fridge magnet)