QQuestionPhysics
QuestionPhysics
"The concept of energy can be calculated in multiple ways. Which units are used for energy? Check all that apply.
joules
kilogram
meters^2 /seconds^2
newtons
kilojoules
meters/seconds^2"
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Answer
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Step 1:I'll solve this problem step by step, focusing on the units of energy:
Step 2:: Understand the Definition of Energy
Energy is a physical quantity that represents the capacity to do work. The standard unit of energy is the joule (J), which has specific dimensional characteristics.
Step 3:: Analyze the Dimensional Units of Energy
- Joules (J): $$\mathrm{J} = \mathrm{kg} \cdot \mathrm{m}^{2} / \mathrm{s}^{2}$$ ✓ CORRECT
Let's break down the units and check their compatibility with energy: - Kilogram: Mass unit, not an energy unit ✗ INCORRECT - Meters²/seconds²: Dimensional equivalent to joules ✓ CORRECT - Newtons: Force unit, not a direct energy unit ✗ INCORRECT - Kilojoules (kJ): 1000 joules, a valid energy unit ✓ CORRECT - Meters/seconds²: Acceleration unit, not an energy unit ✗ INCORRECT
Final Answer
- Joules - Meters²/seconds² - Kilojoules
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