Login

Welcome, Guest. Please login or register.

March 29, 2024, 03:39:47 pm

Author Topic: Are Physics In Focus Answers generally reliable?  (Read 4004 times)  Share 

0 Members and 1 Guest are viewing this topic.

Iminschool

  • Forum Regular
  • **
  • Posts: 66
  • Sup
  • Respect: +1
Are Physics In Focus Answers generally reliable?
« on: January 09, 2017, 12:45:35 am »
0
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?
2016: Mathematics 92
2017 aims: Physics 96
Chemistry 94
Economics 93
English Advanced 90

ATAR AIM: 98ish

jamonwindeyer

  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 10150
  • The lurker from the north.
  • Respect: +3108
Re: Are Physics In Focus Answers generally reliable?
« Reply #1 on: January 09, 2017, 12:52:05 am »
+1
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?

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

  • Forum Regular
  • **
  • Posts: 66
  • Sup
  • Respect: +1
Re: Are Physics In Focus Answers generally reliable?
« Reply #2 on: January 09, 2017, 01:23:22 am »
0
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

Awesome! Here's my first question:

My answer was 2.35×10^-9 N repulsion

Mod Edit: Post merge
« Last Edit: January 09, 2017, 01:51:41 am by jamonwindeyer »
2016: Mathematics 92
2017 aims: Physics 96
Chemistry 94
Economics 93
English Advanced 90

ATAR AIM: 98ish

jamonwindeyer

  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 10150
  • The lurker from the north.
  • Respect: +3108
Re: Are Physics In Focus Answers generally reliable?
« Reply #3 on: January 09, 2017, 01:59:29 am »
0
Awesome! Here's my first question:

My answer was 2.35×10^-9 N repulsion

Mod Edit: Post merge

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

  • Forum Regular
  • **
  • Posts: 66
  • Sup
  • Respect: +1
Re: Are Physics In Focus Answers generally reliable?
« Reply #4 on: January 09, 2017, 02:18:36 am »
0
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
« Last Edit: January 09, 2017, 02:26:55 am by Iminschool »
2016: Mathematics 92
2017 aims: Physics 96
Chemistry 94
Economics 93
English Advanced 90

ATAR AIM: 98ish

jamonwindeyer

  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 10150
  • The lurker from the north.
  • Respect: +3108
Re: Are Physics In Focus Answers generally reliable?
« Reply #5 on: January 09, 2017, 09:57:10 am »
0
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

Awesome! ;D I used to screw that up a lot too actually, nice spot :)

RuiAce

  • ATAR Notes Lecturer
  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 8814
  • "All models are wrong, but some are useful."
  • Respect: +2575
Re: Are Physics In Focus Answers generally reliable?
« Reply #6 on: January 09, 2017, 10:03:05 am »
0
Gonna input on original question

I do recall a small amount of hiccups somewhere in their answers. But they were quite rare tbh and in general the answers are very reliable

Iminschool

  • Forum Regular
  • **
  • Posts: 66
  • Sup
  • Respect: +1
Re: Are Physics In Focus Answers generally reliable?
« Reply #7 on: January 09, 2017, 10:23:41 am »
0
Gonna input on original question

I do recall a small amount of hiccups somewhere in their answers. But they were quite rare tbh and in general the answers are very reliable

Better than nothing I guess. I'll just have to ask around if i'm not sure about the given solutions.
2016: Mathematics 92
2017 aims: Physics 96
Chemistry 94
Economics 93
English Advanced 90

ATAR AIM: 98ish

jamonwindeyer

  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 10150
  • The lurker from the north.
  • Respect: +3108
Re: Are Physics In Focus Answers generally reliable?
« Reply #8 on: January 09, 2017, 10:32:13 am »
+1
Better than nothing I guess. I'll just have to ask around if i'm not sure about the given solutions.

Just come to us; we'll lend a hand :) or cross reference with your classmates, that was always my first step if I was skeptical of a textbook answer (though I did it for Maths way more than Physics) :)

Iminschool

  • Forum Regular
  • **
  • Posts: 66
  • Sup
  • Respect: +1
Re: Are Physics In Focus Answers generally reliable?
« Reply #9 on: January 09, 2017, 11:00:28 am »
0
Just come to us; we'll lend a hand :)

Haha, thanks for the support
2016: Mathematics 92
2017 aims: Physics 96
Chemistry 94
Economics 93
English Advanced 90

ATAR AIM: 98ish