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JAMB Physics 1999 Question 11

Question 11

Quantity of Heat

A piece of substance of specific heat capacity 450 J kg−1 K−1 falls through a vertical distance of 20 m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat

  1. A.2/9 °C
  2. B.4/9 °C
  3. C.5/4 °C
  4. D.9/2 °C
Show the answer and explanation

Answer: B (4/9 °C)

Explanation

mgh = mcθ, so θ = gh/c = (10 × 20)/450 = 4/9 °C (taking g = 10 m s−2).