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October 05, 2025, 08:16:25 pm
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Author Topic: How was it?  (Read 35118 times)  Share 

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bblovee

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Re: How was it?
« Reply #240 on: June 08, 2010, 06:17:54 pm »
yeah that question is weird... their explanation about the hand lowering the mass is a bit vague.
Well i put k=50 and 0J >_<
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Kennybhoy

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Re: How was it?
« Reply #241 on: June 08, 2010, 06:22:58 pm »
The answer to the pulley/mass question is 2ms-2. Confirmed by Fundamentals of Physics (page 86).
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schnappy

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Re: How was it?
« Reply #242 on: June 08, 2010, 06:24:41 pm »
Any chance of a link etc.? I don't exactly own a book called Fundamentals of Physics...
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Killerkob

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Re: How was it?
« Reply #243 on: June 08, 2010, 06:24:51 pm »
I assumed the hand lowering the mass was to safely presume there was no oscillation of the spring-mass system. I used mg=kx and got 50N/m and a loss of 4J as my answers.

Anyone else think these were the hardest ESR questions on an exam?
Star Wars reference ftw.
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kyzoo

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Re: How was it?
« Reply #244 on: June 08, 2010, 06:27:30 pm »
woohoo my physics teacher just said answer was 4J ~~
« Last Edit: June 08, 2010, 06:29:02 pm by kyzoo »
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Stroodle

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Re: How was it?
« Reply #245 on: June 08, 2010, 06:29:06 pm »
Quote from: kyzoo on June 08, 2010, 06:27:30 pm
woohoo my physics teacher just said answer was 0.4J ~~

Really? Mine said it was 4J :(

*Edit*

Quote from: kyzoo on June 08, 2010, 06:27:30 pm
woohoo my physics teacher just said answer was 4J ~~

Woot  ;D
« Last Edit: June 08, 2010, 06:31:45 pm by Stroodle »
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ks04

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Re: How was it?
« Reply #246 on: June 08, 2010, 06:33:50 pm »
Quote from: kyzoo on June 08, 2010, 06:27:30 pm
woohoo my physics teacher just said answer was 4J ~~
My teacher looked at it and was like.... it should be 0J... but he hadn't looked at it closely, this was when we bombarded him immediatly following the exam.
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samuch

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Re: How was it?
« Reply #247 on: June 08, 2010, 06:37:03 pm »
Quote from: ks04 on June 08, 2010, 06:33:50 pm
Quote from: kyzoo on June 08, 2010, 06:27:30 pm
woohoo my physics teacher just said answer was 4J ~~
My teacher looked at it and was like.... it should be 0J... but he hadn't looked at it closely, this was when we bombarded him immediatly following the exam.
yayy :) i put 4J ;)
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appianway

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Re: How was it?
« Reply #248 on: June 08, 2010, 06:38:20 pm »
The change in energy should be k0.4^2/2-4m, whatever that may be... because it's the difference between the initial energy (which is entirely gravitational) and the final energy (which is entirely elastic).
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kyzoo

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Re: How was it?
« Reply #249 on: June 08, 2010, 06:39:21 pm »
Funny though, I got this question without understanding the physics behind it >.<
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a.zirek

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Re: How was it?
« Reply #250 on: June 08, 2010, 07:05:13 pm »
Just a few points I felt the need to make:
1. You can't get 0.5 marks for working out. The VCAA ONLY gives 1,2,3... marks. They're always whole numbers.
2. The acceleration of the n1 and m2 system is 2 m/s. You MUST take the total mass into account.
3. For the graph questions I got A,B,B but my teacher says it was A,A,A as when the collision begins, momentum is lost before it is gained again. I still think it is A,B,B.
4. I AM SCREWED FOR CHEMISTRY TOMORROW.

And.. If I didn't get that graph question wrong like my teacher said.. hello full marks! :)
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jasopan

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Re: How was it?
« Reply #251 on: June 08, 2010, 07:09:16 pm »
Do they give marks when u sub in wrong numbers?  (out of 2 marks)
Marks for almost completely wrong working out and answers but you wrote something? (1 out of 3 or something)
Why was the gain in the amplifier 50? i got 33.33 =$
and please tell me they give consequential marks?! Especially that amplifier one...
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m@tty

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Re: How was it?
« Reply #252 on: June 08, 2010, 07:10:06 pm »
Quote from: a.zirek on June 08, 2010, 07:05:13 pm
Just a few points I felt the need to make:
1. You can't get 0.5 marks for working out. The VCAA ONLY gives 1,2,3... marks. They're always whole numbers.
2. The acceleration of the n1 and m2 system is 2 m/s. You MUST take the total mass into account.
3. For the graph questions I got A,B,B but my teacher says it was A,A,A as when the collision begins, momentum is lost before it is gained again. I still think it is A,B,B.
4. I AM SCREWED FOR CHEMISTRY TOMORROW.

And.. If I didn't get that graph question wrong like my teacher said.. hello full marks! :)

Momentum is conserved throughout the collision. B is correct. There is no fluctuation.
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coletrain

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Re: How was it?
« Reply #253 on: June 08, 2010, 07:16:56 pm »
Quote from: jasopan on June 08, 2010, 07:09:16 pm
Do they give marks when u sub in wrong numbers?  (out of 2 marks)
Marks for almost completely wrong working out and answers but you wrote something? (1 out of 3 or something)
Why was the gain in the amplifier 50? i got 33.33 =$
and please tell me they give consequential marks?! Especially that amplifier one...

i got 33.33 too, could someone explain how itute got (-)50
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Blakhitman

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Re: How was it?
« Reply #254 on: June 08, 2010, 07:18:21 pm »
vout/vin

use any vout and use the corresponding vin. I remember using 10/200x10^3.
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