Multiple Choice
In the context of energy transfer in ecosystems, what does the '10% rule' refer to, and why is energy lost at each trophic level?
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9. Work & Energy
Intro to Energy & Kinetic Energy
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following does not expend energy?
A
A light bulb turned on
B
A book resting on a table
C
A person running up a hill
D
A car accelerating on a highway
Verified step by step guidance1
Understand the concept of energy expenditure: Energy is expended when work is done, which involves a force causing a displacement.
Analyze each option: A light bulb turned on uses electrical energy to produce light and heat, so it expends energy.
Consider the book resting on a table: The book is not moving, and no work is being done on it, so it does not expend energy.
Evaluate the person running up a hill: The person is doing work against gravity, which requires energy expenditure.
Examine the car accelerating on a highway: The car is using energy to increase its speed, thus expending energy.
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