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Q.

The density of a material in SI units is 128 kg m-3. In certain units in which the unit of length is 25 cm and the units of mass is 50 g, the numerical value of density of the material is _______.

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answer is 40.

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Detailed Solution

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For the two system of units,

N1u1=N2u2  ⇒128 kgm3=N2×50 g253 cm3 ⇒N2=128×103106×25350=40

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