A Sankey diagram has an input arrow 30 mm wide, representing 150 J. One output arrow is 8 mm wide. There is only one other output arrow. What energy does the other output arrow represent?
40 J40\ \mathrm{J}40 J
110 J110\ \mathrm{J}110 J
22 J22\ \mathrm{J}22 J
142 J142\ \mathrm{J}142 J
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.