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10 May, 18:10

Depth (m) 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

Table 1.18 gives the average temperature, T, at a depth d, in a borehole in Belleterre, Quebec. 13 Evaluate ΔT/Δd on the the following intervals, and explain what your answers tell you about borehole temperature.

(a) 25 ≤ d ≤ 150

(b) 25 ≤ d ≤ 75

(c) 100 ≤ d ≤ 200

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Answers (1)
  1. 10 May, 20:57
    0
    A.) For 25 ≤ d ≤ 150;

    ΔT/Δd = (5.50 - 5.50) / (150 - 25) = 0/125 = 0

    b.) For 25 ≤ d ≤ 75;

    ΔT/Δd = (5.10 - 5.50) / (75 - 25) = - 0.4/50 = - 0.008

    c.) For 100 ≤ d ≤ 200;

    ΔT/Δd = (6.00 - 5.10) / (200 - 100) = 0.9/100 = 0.009
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