Physics · Oct / Nov 2024 · Paper 11 · Question 17
5054Energy
A wind-up radio is used in areas where mains electricity is not available. A person winds a spring in the radio using the handle. When the spring unwinds, it makes a small coil rotate in a magnetic field. Which energy transfer is not useful for this radio?
- Aelastic potential energy → kinetic energy
- Bkinetic energy → thermal energy
- Cchemical energy → elastic potential energy
- Dkinetic energy → sound energy
As printed in the paper
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Correct answer: B. kinetic energy → thermal energy
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