Worked examples: QCE Physics Formula and Data Book

Selected worked examples

1. Motion · centripetal acceleration

   Formula or reference: a = v²/r

   Units and conditions: Use m/s and m. Acceleration points towards the centre.

   Worked example: A cyclist at 9.0 m/s on a path of radius 18 m has centripetal acceleration 4.5 m/s².

2. Light · photon energy

   Formula or reference: E = hf

   Units and conditions: Use h in J s and f in Hz for energy in J.

   Worked example: A frequency of 7.50 × 10¹⁴ Hz gives about 4.97 × 10⁻¹⁹ J per photon.