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12 questions from this quiz
How well input energy converts to useful
It wastes little energy
Useful energyTotal energy×100%\frac{\text{Useful energy}}{\text{Total energy}} \times 100\%Total energyUseful energy×100%
75%
Less than 100%
Energy cannot be created
Heat or sound
To thermal energy stores in surroundings
It reduces friction between moving parts
Streamlining shapes
Total Energy = Useful Output + Wasted
Wasted heat is created
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