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Questions  

If the speed v of a particle of mass m as function of time t is given by v = ωAsin[(km)t], where A has dimension of length. Which of these is true?

a
The argument of trigonometric function must be a dimensionless quantity
b
Dimensional formula of ω is LT-1
c
Dimensional formula of k is MLT-2
d
Dimensional formula of km  is T

detailed solution

Correct option is A

Phase angle is dimensionless[ωA] = [v][ω]L = LT-1[ω] = T-1[kmt] = M0L0T0[k] = [m][t2] = MT-2[km][t] = M0L0T0    ⇒ [km]   = T-1

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