Useful energy from efficiency
A system in a solar car drivetrain test receives \(460\,\text{J}\) and has efficiency \(67\%\). Calculate the useful output energy. Read the diagram before calculating the requested value. Enter the numerical result and choose the interpretation that matches the physics meaning.
Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.