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If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find ...

If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find t when h = 60J
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  • A 24oC
  • B 20oC
  • C 34oC
  • D 30oC
Correct Answer: Option A
Explanation:
t ∝ h, t = 20, h
t = ? h = 60
t = kh where k is constant
20 = 50k
k = \(\frac{20}{50}\)
k = \(\frac{2}{5}\)
when h = 60, t = ?
t = \(\frac{2}{5}\) × 60
t = 24oC

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