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# Edexcel A2 Physics Unit 5 'Physics from Creation to Collapse' watch

1. (Original post by JayAyy)
I think they said horizontal when they introduced the question, but when it went to part be they stateed that it was vertical
Are you sure?
2. (Original post by Sasukekun)
Yeah they did say something like that, it was like;

"For a black body radiator of temperature T with maximum wavelength intensity (lander), the frequency is proportional to:"

Also almost got the first multiple choice question wrong, haha, changed it at the end though.

I couldn't tell if I was nervous or hot, but this was the first exam where I was sweating, it was damn hot yesterday.

For the multiple choice question about the flux being 4 times greater for X than Y, was it that Y was twice as far as X?

For the question about the air in the lung and the mass transferred per second - For the question about energy used per second to heat the air, did anyone get something like 2.2J per second?
I got 2.2 W
3. I put 2.2Js^-1 (which is virtually the Watt).
4. (Original post by LetoKynes)

In case anyone else was curious..
wow thats cool.
5. (Original post by Pegasus92)
Are you sure?
Positive.
6. (Original post by Sasukekun)
I couldn't tell if I was nervous or hot, but this was the first exam where I was sweating, it was damn hot yesterday.

For the multiple choice question about the flux being 4 times greater for X than Y, was it that Y was twice as far as X?

For the question about the air in the lung and the mass transferred per second - For the question about energy used per second to heat the air, did anyone get something like 2.2J?
It was boiling in our room too, we had a fan though so was okay

And yeah, I think I put Y was twice as far away as X because of the inverse square law.

Erm, I can't remember my answer for that one but I worked out how many breaths were taken per second (something like 0.4) and worked out the energy per whole breath, then used the 0.4 breaths per second to get a rate of ??? Js-1 or W
7. (Original post by LetoKynes)

In case anyone else was curious..
I can't believe a scientist actually got emotional and argued about the lyrics in the song
8. (Original post by Sasukekun)
Yeah they did say something like that, it was like;

"For a black body radiator of temperature T with maximum wavelength intensity (lander), the frequency is proportional to:"

Also almost got the first multiple choice question wrong, haha, changed it at the end though.

I couldn't tell if I was nervous or hot, but this was the first exam where I was sweating, it was damn hot yesterday.

For the multiple choice question about the flux being 4 times greater for X than Y, was it that Y was twice as far as X?

For the question about the air in the lung and the mass transferred per second - For the question about energy used per second to heat the air, did anyone get something like 2.2J per second?
I thought it was Y is 4 times as far away as X.. I'm not sure though, anyone want to confirm?

Also, did everyone get an exact value of 2.2 for the lung question? Cause I got 2.28 something.. And didn't get an exact value for the previous part either, the 1 x 10^-4 one.. But other people seem to have.
9. (Original post by bradley.sparkes)
It was just damn confusing, yeah It's probably my fault for not fully reading everything... but why would it suddenly change from being a mouse attached to a spring horizontally on the floor to being vertical? I swear those things are for cats anyway haha, can't imagine cats playing with them vertically
Yeah Im also sure about it.
10. (Original post by bradley.sparkes)
It was boiling in our room too, we had a fan though so was okay

And yeah, I think I put Y was twice as far away as X because of the inverse square law.

Erm, I can't remember my answer for that one but I worked out how many breaths were taken per second (something like 0.4) and worked out the energy per whole breath, then used the 0.4 breaths per second to get a rate of ??? Js-1 or W
Our rooms were air-conditioned so no sweating.
11. (Original post by dancing.barefoot)
I thought it was Y is 4 times as far away as X.. I'm not sure though, anyone want to confirm?

Also, did everyone get an exact value of 2.2 for the lung question? Cause I got 2.28 something.. And didn't get an exact value for the previous part either, the 1 x 10^-4 one.. But other people seem to have.
Its 2 times since d squared.
12. (Original post by dancing.barefoot)
I thought it was Y is 4 times as far away as X.. I'm not sure though, anyone want to confirm?

Also, did everyone get an exact value of 2.2 for the lung question? Cause I got 2.28 something.. And didn't get an exact value for the previous part either, the 1 x 10^-4 one.. But other people seem to have.
The one previously about the mass per second I got 1.25x10^-4, it was tricky because you work out the volume first, which is also quite close to 1x10^-4, almost confused me, but you need the mass.
13. (Original post by Sasukekun)
The one previously about the mass per second I got 1.25x10^-4, it was tricky because you work out the volume first, which is also quite close to 1x10^-4, almost confused me, but you need the mass.
Did you get exactly 1.25 x 10^-4?

I got something like 1.23.... x 10^-4, I wonder if it's because of rounding.. I won't lose marks for that will I?
14. (Original post by Sasukekun)
The one previously about the mass per second I got 1.25x10^-4, it was tricky because you work out the volume first, which is also quite close to 1x10^-4, almost confused me, but you need the mass.
I too got that, and for the other part, we have to use that answer right?
I mean our answer?
15. was it 1/16 for the ratio of rms
16. (Original post by dancing.barefoot)
Did you get exactly 1.25 x 10^-4?

I got something like 1.23.... x 10^-4, I wonder if it's because of rounding.. I won't lose marks for that will I?
I got exactly 1.25
17. (Original post by Zak979)
was it 1/16 for the ratio of rms
yeah.
18. Mass of the Earth 6x10^24. That was probably something I've always known
19. (Original post by Zak979)
was it 1/16 for the ratio of rms
it was 1/4 for me
20. (Original post by Zak979)
was it 1/16 for the ratio of rms
Indeed.

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