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# The Physics PHYA2 thread! 5th June 2013 watch

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1. On the Jan 13 paper, once you've worked out the wavelength, how do you work out the path difference?
2. Can someone explain to me what the graph means on page 204 in the Nelson Thornes book?

Which curve corresponds to what? There are 3 of them.
3. (Original post by NedStark)
Can someone explain to me what the graph means on page 204 in the Nelson Thornes book?

Which curve corresponds to what? There are 3 of them.
Let me got my book and look

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4. (Original post by NedStark)
Can someone explain to me what the graph means on page 204 in the Nelson Thornes book?

Which curve corresponds to what? There are 3 of them.
This graph ??

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5. On the Jan 13 paper, how do you work out the path difference after working out the wavelength?
6. I've got this exam on the 5th and I havent even started revising for it yet Hopefully start revising for it today
7. (Original post by rainerised)
how do you do jan 12 question 7b? The wave travels to the right.
Describe how the vertical displacement of the knot varies over the next complete cycle
Well you have to look at the scenario in sections. The first part of it would be when the knot moves to the maximum displacement, which is 1/4 way into the cycle of the progressive way.
The next section would be to explain the fact it goes back to to the equilibrium position after 1/2 a cycle.
You would then say the knot is at maximum displacement below the equilibrium displacement after 3/4 of the cycle and finall after a full cycle returns back to the equilibrium position.
(The equilibrium position is the middle dotted line)
8. (Original post by pilotluke1)
on those papers which one is unit 2?
Could not find for jan 2009. Check 2008.
9. (Original post by eilish1903)
This graph ??

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The middle peak refers the to the zero order beam which is the brightest and twice as big as the rest of the peaks, this is because it is the same as the incident beam of light therefore all of the incident light is displayed on the screen. The rest of the peaks are less intense as it had been diffracted more, but they all will have the same width but their peaks would decrease the further away from the zero order beam the less bright they will be.
10. in the june 2012 paper, for question 5b) iv

can you say that the energy stored is proportional to the square of extension? and still get the mark

the answer only has, ''energy is proportional to extension''

but I thought that the energy stored equation can be written both as (1/2)Fx and (1/2)Kx^2

where F = force, and K = spring constant
11. Please could some one help me. What are the three Newton's Laws of motion. I'm really confused; only thought there were two. Thanks in advance.

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12. Could anyone do 3e, the diagram don't really understand what you are meant to put?

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13. (Original post by Punjabi2Chainz)
Please could some one help me. What are the three Newton's Laws of motion. I'm really confused; only thought there were two. Thanks in advance.

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1) object would stay at constant velocity if there are no resultant forces on it (all forces are in equilibrium)

2) force is proportional to mass*acceleration

3) for every force acting against an object, there will be an equal and opposite force

I think thats it
14. (Original post by Jack93o)
1) object would stay at constant velocity if there are no resultant forces on it (all forces are in equilibrium)

2) force is proportional to mass*acceleration

3) for every force acting against an object, there will be an equal and opposite force

I think thats it
Thanks.

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15. For June 2009 question 4b what would the diagram look like?

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16. (Original post by StalkeR47)
At half period or 1/2 period, it returns to its original position. (At full period or 1 period, it still returns to its original position as well but the question only asks for the movement within the half period). Basically, a half period is a movement of a point within the half wavelength. The reason why it is max positive at 1/4 period is because........1/2 period=same position. 1/2 divided by 2 is 1/4=max position. Hope this make sense. If not, ask again.
Thankyou xo

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17. (Original post by susanjan123)
Thankyou xo

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No problem! Hope you understood!
18. (Original post by susanjan123)
For June 2009 question 4b what would the diagram look like?

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Hey, I am just doing this past paper right now I have almost finished all of them. For this question, you will just have to draw a diagram that looks like this.
19. (Original post by susanjan123)
Thankyou xo

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Anymore problems? Just ask me again.
20. (Original post by Jack93o)
1) object would stay at constant velocity* if there are no resultant forces on it (all forces are in equilibrium)

2) force is proportional to mass*acceleration

3) for every force acting against an object, there will be an equal and opposite force

I think thats it
*or stationary

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