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The table below gives the average temperature, T, at a depth d, in a borehole in Belleterre, Quebec.

d, depth (m) T, temp (C∘)

25 5.50

50 5.20

75 5.10

100 5.10

125 5.30

150 5.50

175 5.75

200 6.00

225 6.25

250 6.50

275 6.75

300 7.00

Evaluate ΔT/Δd on the following intervals

A50≤d≤175 ΔT/Δd =


B100≤d≤250 ΔT/Δd =


C75≤d≤125 ΔT/Δd =


Verified Answer :

HomertheGenius

a ) ΔT / Δd = ( 5.75 - 5.20 ) / ( 185 - 50 ) =
= 0.55 / 125 = 0.0044  °C/m
b ) ΔT / Δd = ( 6.50 - 5.10 ) / ( 250 - 100 ) =
= 1.40 / 150 = 0.0093 °C / m
c ) ΔT / Δd = ( 5.30 - 5.10 ) / ( 125 - 75 ) =
= 0.20 / 50 = 0.0040 °C / m

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