Iron is electroplated with------ to protect it from corrosion.
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Oscillation is a type of periodic motion which repeats itself to and from about a point which is called mean position. The period of a Pendulum can be described as a ratio between the length and gravity as,
Here,
L = length
g = Gravity
If we rearrange to find the length we have that,
Our period is 2s and the gravity is 9.8m/s^2, then,
The simple required length of the pendulum must be 0.9929m