Multiple Choice
Which of the following devices is designed to convert energy into mechanical work?
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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
In the context of energy flow in a system, which of the following is typically the initial source of energy?
A
Electric generators
B
Chemical reactions
C
Nuclear reactors
D
The Sun
Verified step by step guidance1
Begin by understanding the concept of energy flow in a system. Energy flow refers to the transfer of energy from one part of a system to another, often starting from an initial source.
Recognize that the initial source of energy in most natural systems on Earth is the Sun. The Sun provides energy through solar radiation, which is essential for processes like photosynthesis in plants.
Consider how the Sun's energy is transformed and utilized in various systems. For example, solar energy can be converted into chemical energy through photosynthesis, which then supports life and ecosystems.
Understand that while electric generators, chemical reactions, and nuclear reactors are sources of energy, they are typically secondary or derived sources. They rely on initial energy inputs, often indirectly from the Sun.
Reflect on the broader implications of the Sun as the primary energy source, influencing climate, weather patterns, and the availability of resources on Earth.
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