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

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1. ^^^Thank you thank you thank youu =]
2. what do we need to know about a 'light year'?
3. (Original post by kappleberry)
Thank youu, but sorry, still really confused. So air isnt an ideal gas-why?
Air consists of:
•78.08% nitrogen
•20.95% oxygen
•0.93% argon
•0.038% carbon dioxide
These are very small light non-polar molecules,so air can be considered an ideal gas.
The ideal gas scenario only fails at extremely low or extremely high pressures/temperatures.

4. (Original post by kappleberry)
what do we need to know about a 'light year'?
That's far far away, where Shrek lives.
A light year is a distance light travels in one year.
d = vt
The question is, at what speed does light travel?
5. (Original post by yadas)
That's far far away, where Shrek lives.
A light year is a distance light travels in one year.
d = vt
The question is, at what speed does light travel?
6. No one can help me?
7. In 15 minutes Mr. Oliver will be answering all your question online!
Join now and get 50% discount!
Details here.
8. (Original post by fredbraty)

I have some questions and i would really appreciate it if someone would be kind enough to help me .

So Tim Akrill,Graham George's book.Page 104.Question 1c)why the answer should be quoted to 2 significant figures?The mass is to 4 significant figures...

Also,3 a)did it mean 0.25 kg of water?

Also,question 5.a)we need the rate of rise of temperature at the beginning of the heating process.What is the beginning??what time interval?

Thank you.Thank you.
1. c) Because that's the minimum s.g. mentioned in the data provided (power, time). Anyway it was quoted to 2 s.g. in b).
3. a) Nah, we are supposed to know that the density of water = 1000kgm-3. That's as basic as the speed of light.
5. a) The beginning is at the origin. Draw a tangent to the curve at t = 0.
9. (Original post by BPat)
When is your last exam?
29th - same - Physics ...
10. (Original post by yadas)
1. c) Because that's the minimum s.g. mentioned in the data provided (power, time). Anyway it was quoted to 2 s.g. in b).

[COLOR="SeaGreen"]3. a) Nah, we are supposed to know that the density of water = 1000kgm-3. That's as basic as the speed of light.

5. a) The beginning is at the origin. Draw a tangent to the curve at t = 0.
oh we always give the answer to the minimum significant fihures the data was?not the maximum?

oh really?lol

oh god!i cant believe i asked that

THANK YOU!!!!!!!!!!!!

By the way i cant join the session!why? :-(
11. (Original post by fredbraty)
No one can help me?
Don't need to know much. But yeah only that the distance it takes for light to travel in one year.
12. (Original post by fredbraty)
oh we always give the answer to the minimum significant fihures the data was?not the maximum?

By the way i cant join the session!why? :-(
Yeah, it's minimum, which gives the highest uncertainty.

What's wrong with the connection?
Me, ishta and His Majesty are there.
13. (Original post by yadas)
Yeah, it's maximum, which gives the highest uncertainty.
What's wrong in connection?
wait we used the maximum or the minimum significant figures?

It says the session is running on a different session server?
14. (Original post by fredbraty)
wait we used the maximum or the minimum significant figures?

It says the session is running on a different session server?
Minimum, minimum, minimum s.f...

Try this link.
15. http://cid-5432f573d3fc3f5a.office.l...hysics%20Q.doc

help with Q 16 please?

thank you !
16. Does anyone have a good explanation of trigonometric parallax?
The spec said we just need to know how distance can be determined using it.
17. ^ isn't it just simple trig?

I havent yet looked through it, so may be wrong
18. (Original post by kappleberry)
http://cid-5432f573d3fc3f5a.office.l...hysics%20Q.doc

help with Q 16 please?

thank you !
There is also a mark scheme, I think you've checked it.
Which part didnt you understand?

(Original post by kathx1)
Does anyone have a good explanation of trigonometric parallax?
The spec said we just need to know how distance can be determined using it.
Do you have a book by Miles Hudson?
Check pages 187 and 188.
19. (Original post by yadas)
There is also a mark scheme, I think you've checked it.
Which part didnt you understand?
I assume it's part 3 (simply because I can't do it)...
Do you have any idea what to do?
20. (Original post by yadas)
There is also a mark scheme, I think you've checked it.
Which part didnt you understand?

Do you have a book by Miles Hudson?
Check pages 187 and 188.
Ah thank you!

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