Einstein's famous equation indicates that E=mc^2, where c is the speed of light and m is the object's mass. Given this, what is the SI unit for E?
And your thinking is...?
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joules :)
The SI unit for energy is the joule (J). To get the answer to this question, we can look at the equation E=mc^2, where E represents energy.
Since mass (m) is typically measured in kilograms (kg) and the speed of light (c) is measured in meters per second (m/s), we can determine the unit for E by substituting the units into the equation.
E = (kg) × (m/s)^2
When we square the unit of speed, we get (m/s)^2. Thus, the unit for energy (E) in this equation is (kg) × (m/s)^2, which is equivalent to kilogram-meter-squared per second-squared (kg⋅m^2/s^2).
However, in the SI system, kilogram-meter-squared per second-squared (kg⋅m^2/s^2) is equivalent to a joule (J). Therefore, the SI unit for energy is the joule (J).