5.1 - Mechanical efficiency
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Practice Questions
Test your understanding with targeted questions
What is the formula for mechanical efficiency?
💡 Hint: Think about what you need to calculate both work output and energy input.
If a machine has a useful output of 20 J and input energy of 25 J, what is the mechanical efficiency?
💡 Hint: Use the formula provided to find your answer.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is mechanical efficiency?
💡 Hint: Focus on what is measured against what is used.
True or False: A higher mechanical efficiency indicates more waste in energy.
💡 Hint: Think about the goal of efficiency.
1 more question available
Challenge Problems
Push your limits with advanced challenges
A machine operates with an input energy of 600 J and produces a useful output of 420 J. If improvements are made that boost the input energy to 800 J without changing the output, what will be the new efficiency?
💡 Hint: Remember to use the efficiency formula for the new values.
If two engines have mechanical efficiencies of 95% and 80%, respectively, and they both input 1000 J, how much useful work do they produce?
💡 Hint: Calculate each one using their respective efficiencies.
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