## swimlife97 Group Title If you are given time and distance, you can determine power if you know force. watts. energy. joules. one year ago one year ago

1. theEric Group Title

Well, watts are the units of power, and joules are the units of energy, and this question isn't going for you knowing units. It wants you to know which physical concept is missing from knowing the power. You're down to "force" or "energy." Do you have a guess and a reason?

2. theEric Group Title

Hint:$P=\frac{W}{t}$

3. theEric Group Title

Want another hint?

4. swimlife97 Group Title

5. theEric Group Title

Okay!$W=F\ d\ cos(\theta)$Put that in the power equation, if you need another hint.

6. swimlife97 Group Title

Is it force?

7. theEric Group Title

Why do you guess "force"?

8. swimlife97 Group Title

W=F d cos(θ) W is work in Joules; F is force through distance; Cos theta is cosine of an angle theta

9. theEric Group Title

So, you say the answer is force because, well, you need it. And I agree, you're totally right.

10. theEric Group Title

$P=\frac{W}{t}=\frac{F\ d\ cos(\theta)}{t}$so you know distance and time, you just need force. The equations can be telling!

11. swimlife97 Group Title

Okay thank you :)

12. theEric Group Title

You're welcome! :)

13. theEric Group Title

And congrats, because you did it! I just posted equations, haha.