Power isAhow strong someone or something isBhow much force is being usedChow much work is being doneDhow fast work is being done

To determine the meaning of power in a scientific context, we can analyze the definitions of the options provided:

1. Power is A: how strong someone or something is.

   • This definition aligns more closely with the concept of strength or force rather than power.

2. Power is B: how much force is being used.

   • While force is related to power, it is not a complete definition. Power encompasses more than just the force applied; it also considers the time factor.

3. Power is C: how much work is being done.

   • This option describes work, but doesn't accurately capture power, as power measures the rate at which work is done.

4. Power is D: how fast work is being done.

   • This is the most accurate definition of power in physics. Power is defined as the rate of doing work or the amount of energy transferred in a given time. Mathematically, power (P) can be expressed by the formula: $P = \frac{W}{t}$ Where $W$ is the work done in joules and $t$ is the time in seconds.

Conclusion

Considering all of the above, the best answer is D: how fast work is being done.