Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

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

    Offline

    0
    ReputationRep:
    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.
    Offline

    0
    ReputationRep:
    (Original post by terminatorsb)
    6PH05 and the 0 as in the number
    No go to channel - 6PHY5
    Offline

    0
    ReputationRep:
    Hi

    Just a quick question. During fusion, do the products have a higher binding energy per nucleon? Thanks
    Offline

    0
    ReputationRep:
    So what extra formula's you guys learning, we may as well make a proper list.

    Mine so far:
    PE=\frac{1}{2}kx^2
    T=2 \pi \sqrt {\frac{m}{k}}
    Offline

    0
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    (Original post by Uberuvy)
    Inorder to release energy, yes
    Thanks and same for fission?
    Offline

    0
    ReputationRep:
    (Original post by abstract24)
    Thanks and same for fission?
    yep
    Offline

    0
    ReputationRep:
    (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 :yep:
    Offline

    2
    ReputationRep:
    (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

    final answer, 2g
    Silly question but whats rho :o:
    Offline

    0
    ReputationRep:
    http://qchat.rizon.net/ on 6PH05 all phys students are there...0 is the number
    Offline

    0
    ReputationRep:
    (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.
    • PS Helper
    Offline

    0
    ReputationRep:
    PS Helper
    (Original post by definite_maybe)
    Silly question but whats rho
    letter to represent density. it looks like a P
    Offline

    1
    ReputationRep:
    (Original post by kosy91)
    letter to represent density. it looks like a P
    Kosy Best of luck tomorrow!!!!!!!! :yep:
    Offline

    2
    ReputationRep:
    (Original post by kosy91)
    letter to represent density. it looks like a P
    thanks
    Offline

    1
    ReputationRep:
    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
    Offline

    17
    ReputationRep:
    (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 :o:
    Offline

    1
    ReputationRep:
    (Original post by OL1V3R)
    Stuff
    Props to the awesome explanation, thanks a ton man.
    • PS Helper
    Offline

    0
    ReputationRep:
    PS Helper
    (Original post by fredbraty)
    Kosy Best of luck tomorrow!!!!!!!!
    hey thanks.....and to you too
    Offline

    0
    ReputationRep:
    Hey quick question plz!

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

    thnx in advance
    • PS Helper
    Offline

    0
    ReputationRep:
    PS Helper
    good night everyone!!!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 27, 2015
Poll
Do you like carrot cake?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.