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

1. Yea the axis are meant to be the otherway around.
It was a specimin paper so im guessing they didn't really put much time into it nor check it.
2. (Original post by terminatorsb)
6PH05 and the 0 as in the number
No go to channel - 6PHY5
3. Hi

Just a quick question. During fusion, do the products have a higher binding energy per nucleon? Thanks
4. So what extra formula's you guys learning, we may as well make a proper list.

Mine so far:

5. (Original post by abstract24)
Hi

Just a quick question. During fusion, do the products have a higher binding energy per nucleon? Thanks
Inorder to release energy, yes
6. (Original post by Uberuvy)
Inorder to release energy, yes
Thanks and same for fission?
7. (Original post by abstract24)
Thanks and same for fission?
yep
8. (Original post by Bronze92)

the axes are obviously wrong, right?
EDEXCEL -.-"
yup axis is wrong. Answer i think was B, this was discussed earlier in this thread somehwre
9. (Original post by kosy91)
g=(G*rho* 4/3* piR^3) over R^2
so G=(3g)/(4pi*R*rho)

let gravitational potential strength at other planet be x

so x=(G*rho* 4/3* pi(2R)^3) over (2R)^2

put it the value of G from above

Silly question but whats rho
10. http://qchat.rizon.net/ on 6PH05 all phys students are there...0 is the number
11. (Original post by abstract24)
Hi

Just a quick question. During fusion, do the products have a higher binding energy per nucleon? Thanks
Yes, during fusion and fission, the binding energy per nucleon increases, In addition to the release of energy.
12. (Original post by definite_maybe)
Silly question but whats rho
letter to represent density. it looks like a P
13. (Original post by kosy91)
letter to represent density. it looks like a P
Kosy Best of luck tomorrow!!!!!!!!
14. (Original post by kosy91)
letter to represent density. it looks like a P
thanks
15. Can anyone offer a good explanation as to why ductile materials reduce the amplitude of oscillation?

What I'm reading from my book is; "A ductile material is one that can be deformed plastically without loss of strength, which means that they can absorb a lot of energy" - But doesn't that mean the ductile material can only be used once?

Also it says "If vibrations occur in a ductile material, the material goes through a hysteresis loop each vibration. This absorbs the energy and prevents vibrations of large amplitude building up" - What the hell is a hysteresis loop? ;x
16. (Original post by Sasukekun)
Can anyone offer a good explanation as to why ductile materials reduce the amplitude of oscillation?

What I'm reading from my book is; "A ductile material is one that can be deformed plastically without loss of strength, which means that they can absorb a lot of energy" - But doesn't that mean the ductile material can only be used once?

Also it says "If vibrations occur in a ductile material, the material goes through a hysteresis loop each vibration. This absorbs the energy and prevents vibrations of large amplitude building up" - What the hell is a hysteresis loop? ;x
The definition of a ductile material is correct. A ductile material can deform plastically causing energy to be lost from the system as the material is stretched beyond its elastic limit. For example, if you're using a bungee cord and it's ductile, most of the energy needs to be absorbed upon the first drop to decrease the amplitude. I think because the cord doesn't become compressed but becomes stretched, upon each drop the amplitude is further reduced by the loss of energy, so the damping is an example of underdamping (as the person on the end of the cord can undergo several cycles before coming to equilibrium).

This is basically hysteresis (y-axis is force, x-axis is extension):

This applies for elastic materials as well. Basically if you unload a material, less work is done in restoring it than the amount of work done to stretch it in the first place, explaining the gap between the curves (i.e. work done by material = area under graph). This means that some energy is lost due to heat upon restoration. This cycle repeats upon successive loading and unloading, and this is what is meant by a hysteresis loop. Using the bungee cord again as an example, a ductile material will have a very large gap between the two curves, meaning that both gravitational potential energy and kinetic energy are lost from the person, which are converted into elastic potential energy.

Hope that helps, sorry it's a bit long winded
17. (Original post by OL1V3R)
Stuff
Props to the awesome explanation, thanks a ton man.
18. (Original post by fredbraty)
Kosy Best of luck tomorrow!!!!!!!!
hey thanks.....and to you too
19. Hey quick question plz!

What does the area under the graph represent for the graph of Energy output against wavelngth (astrohpysics) ???

20. good night everyone!!!

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