Search found 12 matches

by Mini
Wed Jun 27, 2012 1:28 pm
Forum: Physics Questions
Topic: Physics and Finance?
Replies: 3
Views: 1838

Re: Physics and Finance?

Why not? If you like it and are good enough, you can become a physicist. If not, you can become a quant and get rich. That's correct, except that you wont become a physicist and an actuary (say) at the same time. This means that you will specialise in either physics or actuarial studies, but not bo...
by Mini
Fri Dec 17, 2010 8:52 am
Forum: High School Physics
Topic: NSW HSC 2009 What are the answers to Qs 3&5?
Replies: 5
Views: 263516

Re: NSW HSC 2009 What are the answers to Qs 3&5?

Ahh yes I see that now. When I did the HSC, these types of questions were very 'standard' and I recall that textbooks didn't consider the KE of satellites in making such calculations. Probably the reason is that mechanical energy was not in the course. I only came across it during PHYS1A. But yes th...
by Mini
Thu Dec 16, 2010 12:44 pm
Forum: High School Physics
Topic: NSW HSC 2009 What are the answers to Qs 3&5?
Replies: 5
Views: 263516

Re: NSW HSC 2009 What are the answers to Qs 3&5?

Q3 A satellite is moved from a geostationary orbit to a higher orbit. Which statement about the orbit change is correct? According to http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2009exams/pdf_doc/physics-marking-guide-09.pdf , the correct answer was C, which is what I would've chosen. Also, I...
by Mini
Wed Nov 03, 2010 11:21 pm
Forum: High School Physics
Topic: TWIN PARADOX
Replies: 2
Views: 9646

Re: TWIN PARADOX

Having done the HSC course, I recall seeing questions involving the twin paradox in past papers. Therefore I'd advise you to learn it.

It's something that you should understand anyway if you know relativity well enough.
by Mini
Sun Jul 11, 2010 11:56 pm
Forum: High School Physics
Topic: ADVANTAGES of DC generator
Replies: 6
Views: 17408

Re: ADVANTAGES of DC generator

I thought of something interesting to note. The overhead transmission lines in Sydney (ie. CityRail) are 1500V DC.

I wonder how much the actual power losses due to this are.
by Mini
Sun Jul 11, 2010 11:52 pm
Forum: High School Physics
Topic: Time dilation
Replies: 2
Views: 9761

Re: Time dilation

tv=t0/sqrt(1-v^2/c^2) The person in the spacecraft measures t0. So t0 < tv. Therefore in the spacecraft's frame of reference, an event takes a shorter amount of time to occur compared to the Earth's "stationary" frame of reference. Suppose that the person in the spacecraft had an identical...
by Mini
Wed Jul 07, 2010 11:03 am
Forum: High School Physics
Topic: Q21(c) 2009 HSC
Replies: 1
Views: 9283

Q21(c) 2009 HSC

Hello Prof Joe, I've been wondering about this question for a while... Here's the paper: http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2009exams/pdf_doc/2009-hsc-physics.pdf There are two approaches to what you could take. 1) Use F=BIL and then use F=mg and solve for B. 2) Halve the torque found...
by Mini
Thu Jun 17, 2010 7:00 pm
Forum: High School Physics
Topic: ADVANTAGES of DC generator
Replies: 6
Views: 17408

Re: ADVANTAGES of DC generator

I think, but I'm not 100% sure, that transmitting electricity using DC will be better for underground cables.
by Mini
Thu Jun 17, 2010 6:28 pm
Forum: High School Physics
Topic: p-type semiconductors
Replies: 3
Views: 9932

Re: p-type semiconductors

Having done the HSC "Physics" course, I don't think drift velocity is in the course.
by Mini
Sat May 08, 2010 11:08 pm
Forum: Physics Questions
Topic: Vocals and singing
Replies: 3
Views: 2025

Re: Vocals and singing

Hmm okay, but I'm still confused as to how I can identify a singer. Eg, when I hear music, say on the radio, and I've heard the singer before (not necessarily singing the same song), then I can think to myself "Hey, that's x singing". Or to put it differently, if two people sing the same s...
by Mini
Fri May 07, 2010 11:42 pm
Forum: Physics Questions
Topic: Vocals and singing
Replies: 3
Views: 2025

Vocals and singing

Hello, Just out of curiosity. I was thinking the other day... everyone has a different voice, which you can tell easily. Now people also have distinct voices when they sing (well mostly). But I'm aware that when, say, two different people sing the same song (in the same key), then they would effecti...
by Mini
Sun Apr 04, 2010 10:51 am
Forum: Physics Questions
Topic: If acceleration was "not" constant and nth derivatives
Replies: 4
Views: 1538

Re: If acceleration was "not" constant and nth derivatives

joe wrote:Why those names? Scientists and engineers sometimes have weird senses of humour. Hence the names of quark, or quantum chromodynamics and the colour force.

Or as my high school Physics teacher said, they sat around at university all day getting high off drugs :P

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