A piece of substance of specific heat capacity ... - JAMB Physics 2021 Question
A piece of substance of specific heat capacity 450Jkg\(^{-1}\)k\(^{1}\) falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms\(^{-2}\)]
A
\(\frac{2}{9}\)ºC
B
\(\frac{4}{9}\)ºC
C
\(\frac{9}{2}\)ºC
D
\(\frac{9}{4}\)ºC
correct option: b
According to the law of conservation of energy, energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
mc\(\bigtriangleup\theta\) = mgh
\(\bigtriangleup\theta\) = \(\frac{gh}{c}
= \frac{10 \times 20}{450}
= \frac{4}{9}\)ºC
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