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PRACTICE / SI units

Unpack a watt before converting area

A sensor receives 0.24 W uniformly over an area of 6.0 cm².

What is the energy flux in SI units kg·s⁻³?

Organize the givens & assumptions
  • Power = 0.24 W
  • Area = 6.0 cm²

Uniform incident power per area; use exact SI prefix conversions. This is energy flux, not total received energy.

  1. A400 kg s−3400\ \mathrm{kg\,s^{-3}}
  2. B0.04 kg s−30.04\ \mathrm{kg\,s^{-3}}
  3. C4 kg s−34\ \mathrm{kg\,s^{-3}}
  4. D4000 kg s−34000\ \mathrm{kg\,s^{-3}}

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