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The melting point of nickel is 1080°C and its heat of fusion is 200kJ/kg. If a nickel coin at this temperature is fully melted by the absorption of 2000J of heat, what is the coin’s mass?

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Interesting fact:

This should make you appreciate the power of physics more in our tech-dominant world – GPS is based on the formula, E = mc2. So, GPS works because of the theory of relativity!