The SI unit for the resultant velocity is
What is SI unit of viscosity coefficient (η)?
(a) Pascal (b) Nsm−2 (c) km−2s (d) Nm−2
Two harmonic waves are represented in SI units by, y1 (x, t) = 0.2 sin (x − 3.0t) and y2 (x, t) = 0.2 sin (x−3.0t + ϕ). What is the expression for the sum y = y1 + y2 for ϕ =π2.