Q9 of 13 Page 35

In a practical unit if the unit of mass becomes double and that of unit of time becomes half, then 8 joules will be equal to ________?

Let,

be the old units of mass, length and time. Also let be the new units of mass, length and time.


We know that the magnitude of physical quantity remains unchanged whatever may be the system of units.



Now, dimensions of Energy is .


So,


Thus,




Hence,


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