# Linear mapping/R to R/Physics examples/Proportionality/Exercise

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Interpret the following physical laws as linear functions from to . Establish, in each situation, what is the measurable variable and what is the proportionality factor.

- Mass is volume times density.
- Energy is mass times the calorific value.
- The distance is speed multiplied by time.
- Force is mass times acceleration.
- Energy is force times distance.
- Energy is power times time.
- Voltage is resistance times electric current.
- Charge is current multiplied by time.