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A water fall is 420m high. Calculate the difference in temperature of the water between...

Physics
WAEC 1991

A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m-2 specific heat capacity of water = 4.20 x 10\(^3\) JKg-1 K-1)

  • A. 0.1oC
  • B. 1.0oC
  • C. 42oC
  • D. 100oC
  • E. 4.20oC
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Correct Answer: Option B
Explanation

Potential Energy = Heat Energy

mgh = Mc\(\Delta \theta = \frac{gh}{c} = \frac{10 \times 240}{4.20 \times 10^3}\)

= 1.0oC


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