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

1. (Original post by JayAyy)
Mass of the Earth 6x10^24. That was probably something I've always known
But it didnt come exactly right?
somewhere around 6. something?
2. (Original post by Bronze92)
it was 1/4 for me
thats wrong unfortunately.
3. what did people get for the energy of the alpha particles.....5.26Mev?
4. (Original post by Pegasus92)
But it didnt come exactly right?
somewhere around 6. something?
I got something like 5.99somethingsomethingsomething, so I could only round it to 6.
5. (Original post by Zak979)
what did people get for the energy of the alpha particles.....5.26Mev?
yeah got that.
6. (Original post by JayAyy)
I got something like 5.99somethingsomethingsomething, so I could only round it to 6.
I remember getting some 6. something, but no problem.
7. I got 5.9 x 10^24..

And was RMS 1/16 or 1/4??
8. 1/16
9. Guys are you sure about the root mean squared question?

Oxygen mass = 32, Hydrogen (I think it was hydrogen) = 2

They wanted

3kT was the same for both

For oxygen

For hydrogen

So

Is

= 1/4?
10. In the lungs question.. Were there 4 parts or 3?
I remember the assumption, the mass per second, and the rate one at the end..
11. (Original post by Sasukekun)
Guys are you sure about the root mean squared question?

Oxygen mass = 32, Hydrogen (I think it was hydrogen) = 2

They wanted

3kT was the same for both

For oxygen

For hydrogen

So

Is

= 1/4?
12. what were the 2 assumptions
temperature and mass right?
for the lung question
13. (Original post by fredbraty)
nooo
Its 1/16, but I dnt remeber how to proof it.
yadas proofed it though for you, didnt he.
14. (Original post by Pegasus92)
nooo
Its 1/16, but I dnt remeber how to proof it.
yadas proofed it though for you, didnt he.
no yadas put 1/4 as well.
What he said is that it was easy for someone to confuse and put 1/16.
You didnt see the "root" word.

There were lots of tricks as i said previously.

They asked for the mean speeds, not for the mean square speeds (which would be 1/16).
That's what Yadas said^, he's saying it's not 1/16.
16. oh well its only one mark

They asked for the mean speeds, not for the mean square speeds (which would be 1/16).
so whats the answer for that?
18. (Original post by JayAyy)
I got something like 5.99somethingsomethingsomething, so I could only round it to 6.
what did you put for the 2 assumptions.
lung question?
19. same mass of air, and constant temperature of air
20. I put assumptions: constant temperature and air behaves as an ideal gas..

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