Air is flowing along a flat plate. Air velocity is 1 m/s. Calculate 1 m from the leading edge of the plate, a) the thickness of the velocity boundary layer b) the thickness of the thermal BL. c) velocity 2 cm from the plate (1 m from the leading edge). d) Now assume that fluid is water. Calculate the thickness of the thermal BL at the point where thickness of the velocity boundary layer is 5 mm.

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d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day