Ahole of diameter d = 0.25 m is drilled through the center of a solid block of square cross section with w = 1 m on a side. the hole is drilled along the length, l = 2 m, of the block, which has a thermal conductivity of k = 150 w/m ⋅ k. the four outer surfaces are exposed to ambient air, with t[infinity],2 = 25°c and h2 = 4 w/m2 ⋅ k, while hot oil flowing through the hole is characterized by t[infinity],1 = 300°c and h1 = 50 w/m2 ⋅ k. determine the corresponding heat rate and surface temperatures.

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

it would stay the same