- #1
s3a
- 818
- 8
Homework Statement
The problem and its solution are attached as TheProblemAndSolution.png.
Homework Equations
Integration
P = VI
V = RI
The Attempt at a Solution
I think Wolfram Alpha “says” ( http://www.wolframalpha.com/input/?i=integrate+900sin^2(377t)+dt+from+0+to+pi ) that the equation should be the way it is with a dt rather than a d(377t).
I think I get why the limits of integration are 0 to π rather than 0 to 2π (I'm guessing it's because we're taking the average – which is (0+2π)/2 = π) but, I'm having trouble with the following.:
(1) How am I supposed to know to multiply by 1/π?
(2) Is the p_(avg) equation supposed to have dt instead of d(377t)?
(3) Is it a fluke that the limits of integration have been from 0 to 2π and then divided by 2 to get the same answer?
I might have more questions that arise as I get these answered but, I am not sure yet.
Any help would be greatly appreciated!