πŸ“ OCR A Physics Paper 3 prep guide β€” last-minute revision, hints & synoptic topics

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AS Β· Foundations of Physics (M2)

A camping heater is marked 60 W at 12 V. For a short test it is powered from a 6.0 V DC supply. Assuming its resistance does not change significantly at the lower temperature, which is the best estimate of the power it now dissipates?

A2 Β· Archimedes’ principle (M3.2)

A cylindrical fishing float stands upright in fresh water with 75% of its volume submerged. It is then placed in a liquid that is 1.2 times as dense as fresh water. Assuming the float does not absorb liquid and its mass is unchanged, what fraction of its volume will be submerged in the denser liquid?

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