This question is about a high-power laser array used for deep-space propulsion.
Write down the equation which links energy (EEE), power (PPP), and time (ttt).
The laser array has a continuous power output of 820 MW820\text{ MW}820 MW. Calculate the total energy emitted by this array during a continuous test firing of 5500 s. Give your answer in Joules (J\text{J}J) in standard form.
Due to scheduled cooling cycles and system maintenance, the laser array cannot be operated every day. In a given year (1 year=365 days1\text{ year} = 365\text{ days}1 year=365 days), the array is operational for 68% of the year. Calculate the number of days during that year that the array is operational.
Practise AQA GCSE Physics Energy changes in a system, and the ways energy is stored before and after such changes with exam-style questions for Foundation and Higher tier. 64 questions covering Energy stores and systems, Changes in energy, Energy changes in systems, and Power, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.