An electrically powered stage mechanism pulls a scenery panel through 8.0 m. It exerts a constant force of 75 N in the direction of movement and receives 1.0 kJ of energy.
A Sankey diagram is planned with a 50 mm input arrow and two output branches. One output represents the work done on the panel and the other represents energy transferred to thermal stores.
What width should be used for the branch representing the energy transferred to thermal stores?
40 mm40\ \mathrm{mm}40 mm
8.0 mm8.0\ \mathrm{mm}8.0 mm
30 mm30\ \mathrm{mm}30 mm
20 mm20\ \mathrm{mm}20 mm
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.