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Are Physics In Focus Answers generally reliable?
Iminschool:
So i've been doing a few questions and have come across which i believe are errors in the solutions such as using the diameter in the (Pie.r^2) formula for the area of a circle instead of the radius.
Has anyone else stumbled across this problem?
jamonwindeyer:
--- Quote from: Iminschool on January 09, 2017, 12:45:35 am ---So i've been doing a few questions and have come across which i believe are errors in the solutions such as using the diameter in the (Pie.r^2) formula for the area of a circle instead of the radius.
Has anyone else stumbled across this problem?
--- End quote ---
I never ran into any major problems with Physics in Focus, but I didn't use it for practice questions all that often - I used it more for the content. In any case, remember as you study you are welcome to post any questions/answers that seem a little dubious up here and we'll run an eye over it for you! ;D
Iminschool:
--- Quote from: jamonwindeyer on January 09, 2017, 12:52:05 am ---I never ran into any major problems with Physics in Focus, but I didn't use it for practice questions all that often - I used it more for the content. In any case, remember as you study you are welcome to post any questions/answers that seem a little dubious up here and we'll run an eye over it for you! ;D
--- End quote ---
Awesome! Here's my first question:
My answer was 2.35×10^-9 N repulsion
Mod Edit: Post merge
jamonwindeyer:
--- Quote from: Iminschool on January 09, 2017, 01:23:22 am ---Awesome! Here's my first question:
My answer was 2.35×10^-9 N repulsion
Mod Edit: Post merge
--- End quote ---
On a quick scribble, I get \(5.88\times10^{-10} N\) repulsion, is that the textbooks answer? (maybe from now on attach your answers and the textbooks, that way if it's right I know, and if it's wrong I can try and figure out why) :)
Iminschool:
Crap, just realised that in my solution i accidentally wrote for current 1 and 2 as (50x10^-3 × 2) instead of (50x10^-3)^2
Edit: Answer becomes 5.88 × 10^-10 N repulsion so yea we get the same answer
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