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12 questions from this quiz
useful energytotal energy×100%\frac{\text{useful energy}}{\text{total energy}} \times 100\%total energyuseful energy×100%
How well a material lets thermal energy pass through it
Temperature difference, thickness, conductivity
Heat
Less than 100%
60%
Metals like copper and aluminium
Wood, plastic, and air
It reduces friction in moving parts
They slow down energy transfer
It makes energy transfer faster
They reduce air resistance
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