A new system of units is proposed in which the unit of mass is a kg, unit of length ββ m, and unit of time γγ s. How much will 5 J measure in this new system?
We know that dimension of energy =[ML2T−2]Let M1, L1, T1 and M2, L2, T2 are units of mass, length, and time in given two systems.We know that dimension of energy =[ML2T−2]Let M1, L1, T1 and M2, L2, T2 are units of mass, length, and time in given two systems.
∴M1=1 kg, L1=1 m, T1=1 secM2=α kg, L2=β m, T2=γ sec
Step 2: Use the conversion of units.
The magnitude of a physical quantity remains the same, whatever be the system of units of its measurement i.e., nu1=n2u2
⇒ n2=n1u1u2=n1[M1L21T−21][M2L22T−22]=5[M1M2]×[L1L2]2×[T1T2]-2
=5[1αkg]×[1βm]2×[1γs]−2
=5×1α×1β2×1γ−2
n2=5γ2αβ2
Thus, a new unit of energy will be γ2αβ2.
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