Express 204 in five significant digits.

20400x10–2
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Name the digit that can be both significant and non-significant.


Zero.
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Mass x Pressure over Density is represented by which physical quantity? 

Work or energy. 

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What is the dimensional formula of mass per unit length?

[M1L–1T0]
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Name the method that is used to measure the distances of planets or stars from the earth.

Parallax method.
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