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October 15, 2025, 04:10:42 pm

Author Topic: Exam Discussion  (Read 47169 times)

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OnlySteven

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Re: Exam Discussion
« Reply #45 on: June 12, 2012, 03:02:03 pm »
reading this thread makes me feel awful.

billyjackson768

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Re: Exam Discussion
« Reply #46 on: June 12, 2012, 03:02:30 pm »
For the draw a circuit did you get 2000 ohms resistor and the V out on the Light dependant thingi since its resistance increases with decreasing light intensity?
I set it up how you said, but with a 1000 ohm resistor. I probably made a stupid mistake, not confident at all right now.

Yeah I got 2000 ohms for that.

Bhootnike

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Re: Exam Discussion
« Reply #47 on: June 12, 2012, 03:04:34 pm »
Surprised that no one has used the range formula in order to find the velocity of the projectile motion. And I thought hookes law only has one formula which is f = kx :/. Left like 6 questions thanks to my school being indie and picking relativity as detailed study. Mums pretty pissed about leaving 6 questions... sigh

i did thattt ;)

for  the tension in the rope with logs, why did some ppl say 800N?
if it wasnt accelerating, and if you consider tension in last rope, then ma = t - 400, where a =0, so t = 400 ?
and where did you say the rope broke?

Also, in elecronics, what resistance values did people use when designing the circuit?
looking forward to some solutions
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billyjackson768

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Re: Exam Discussion
« Reply #48 on: June 12, 2012, 03:04:43 pm »
reading this thread makes me feel awful.

Hehe... same here.  :'(

So far have learnt they wanted to actually know a fraction/percentage of power output for the 2 LED question. I only gave an amount. :(

Genericname2365

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Re: Exam Discussion
« Reply #49 on: June 12, 2012, 03:05:45 pm »
I got 2000 ohms but then I put the LED before the Vout for some reason ::)
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aznxD

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Re: Exam Discussion
« Reply #50 on: June 12, 2012, 03:06:30 pm »
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billyjackson768

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Re: Exam Discussion
« Reply #51 on: June 12, 2012, 03:07:32 pm »
Surprised that no one has used the range formula in order to find the velocity of the projectile motion. And I thought hookes law only has one formula which is f = kx :/. Left like 6 questions thanks to my school being indie and picking relativity as detailed study. Mums pretty pissed about leaving 6 questions... sigh

i did thattt ;)

for  the tension in the rope with logs, why did some ppl say 800N?
if it wasnt accelerating, and if you consider tension in last rope, then ma = t - 400, where a =0, so t = 400 ?
and where did you say the rope broke?

Also, in elecronics, what resistance values did people use when designing the circuit?
looking forward to some solutions

As above I got 2000ohm for the resistor. As for the tension I got 800n too. Frictional force on each log was 400N so 400N + 400N =800N?

Tonychet2

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Re: Exam Discussion
« Reply #52 on: June 12, 2012, 03:10:07 pm »
lost 7 or 9 marks DAM>...

pwntnubs

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Re: Exam Discussion
« Reply #53 on: June 12, 2012, 03:11:33 pm »
so is it wrong if the 1000 ohm resistor was used? what did everyone get for S&M? i got :
1. D
2. A
3. C
4. D
5. A
6. A
7. B
8. D
9. B
10. B
11. C
12. C

Bhootnike

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Re: Exam Discussion
« Reply #54 on: June 12, 2012, 03:11:52 pm »
Fml. With that ball q.. I wrote "north" instead of up lol. Will I lose a mark for that?

dont think so!
The output signal was clipped off and inverted? and for the circutary drawing i got 1000 ohms as the resistor since you knew the current from the previous question...

yes twas

---


As above I got 2000ohm for the resistor. As for the tension I got 800n too. Frictional force on each log was 400N so 400N + 400N =800N?

oh, but, DAamn..
i justt went: consdering rope 2 only:
Fnet = t -400,
ma = t -400
0 = t-400
t = 400.

:'(


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mikesguns

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Re: Exam Discussion
« Reply #55 on: June 12, 2012, 03:13:39 pm »
Exam answers are here http://www.itute.com/board/viewtopic.php?f=6&t=2478
hope you all did well!!
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fisa2001

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Re: Exam Discussion
« Reply #56 on: June 12, 2012, 03:14:38 pm »
What was the resistance of the LDR in the draw-a-circuit question?


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rife168

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Re: Exam Discussion
« Reply #57 on: June 12, 2012, 03:15:02 pm »
for  the tension in the rope with logs, why did some ppl say 800N?
if it wasnt accelerating, and if you consider tension in last rope, then ma = t - 400, where a =0, so t = 400 ?
and where did you say the rope broke?

I think the question asked for the tension in R1 which was pulling both logs. Fnet= 0  so  T = FR = 400 + 400 = 800N
I said that R1 broke.
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pwntnubs

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Re: Exam Discussion
« Reply #58 on: June 12, 2012, 03:16:04 pm »
Exam answers are here http://www.itute.com/board/viewtopic.php?f=6&t=2478
hope you all did well!!

thanks, sigh lost 4 marks for S&M

Bhootnike

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Re: Exam Discussion
« Reply #59 on: June 12, 2012, 03:17:39 pm »
wouldve lost marks for that log question then.
i said bloody 400 N for tension
and for the rope breaking one i found a =4ms^2.
 
fml.;9
hope to god those answers r wrong ... :(
2011: Biol - 42
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khuda ne jab tujhe banaya hoga, ek suroor uske dil mein aaya hoga, socha hoga kya doonga tohfe mein tujhe.... tab ja ke usne mujhe banaya hoga