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Physics P3 watch

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    the diagram for the lens diagram question was designed so that if you measured it it would be the wrong length so you couldn't just measure the other one. They wanted you to use your brain to work out the relationship. another one of those how science works moments i feel!

    EDIT: so yes it was 4 and the answer was 0.35 (unless i've gone very mad!)
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    ....seems like I've got EVERYTHING wrong there then...
    do you lose marks for spelling 'centripetal' wrong?


    .....I spelt 'centrapetal....'
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    (Original post by Rukia)
    ....seems like I've got EVERYTHING wrong there then...
    do you lose marks for spelling 'centripetal' wrong?


    .....I spelt 'centrapetal....'
    i wouldnt think so therell no what you mean so should give themark
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    (Original post by Clevergecko)
    i wouldnt think so therell no what you mean so should give themark
    thank goodness~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~ (at the end of the day i've got some marks then)
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    btw the ultrasound question should be 45mm shouldn't it? cos the sound bounces back when it reaches the crack so twice of the distance is taken?
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    (Original post by Rukia)
    btw the ultrasound question should be 45mm shouldn't it? cos the sound bounces back when it reaches the crack so twice of the distance is taken?
    i put 90, but i think your right, i got confused with the wording of the question
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    (Original post by Clevergecko)
    i put 90, but i think your right, i got confused with the wording of the question
    I also put 90, after crossing out 45! arrghh!
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    I put 90mm
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    I got 94 for that ! Lol .. Itz bcoz i divided it by 14 not 12
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    the more and more people putting around 90 is good *phew* feeling better
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    I made a stupid mistake for the ultrasound question - I put 72mm cos I did it from the biggest peak (you know, the one 2 squares from the left). Idiot I am!

    Ah well. At least it's only 1 mark
    In all I think I lost around 10-12 marks. Hopefully enough for a medium A.
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    (Original post by Champagne Supernova)
    the more and more people putting around 90 is good *phew* feeling better
    he he lol i know i know what you mean... maybe i was right
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    The distance was 90 as the 120 you had to work it out from was the distance from the front.
    The light sensor was film, CCD or CMOS
    What did people put for the satellites question? I didn't know if they were asking for reasons why the orbit might vary or inaccuracies in the data. It was weird because the conclusion that they led you to is always true. (I think)
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    What about some satellites stay in the same position all the time? therefore not even having an orbital period?
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    (Original post by Fatema991)
    What about some satellites stay in the same position all the time? therefore not even having an orbital period?
    Geostationary satellites have an orbital period of 24hrs, that's how they appear to be over the same spot.
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    but if its moving, then it can't monitor something 24/7?
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    (Original post by Fatema991)
    but if its moving, then it can't monitor something 24/7?
    It moves with the Earth, so it stays over the same position all the time.
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    Oh dear. that's another mark lost!
    thanks though! =)
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    For the satellite question I made a mess.

    For reason 1, I said that some satellites are geostationary while others have a polar orbit.

    I then realised that I answered the start of both reasons in one!

    So then, in the second reason, I wrote that geostationary satellites have an orbit period fo 24hrs no matter what the altitude, while satellites with a polar orbit can sweep over both poles at any altitude.

    I then wrote a side note to the examiner: "Sorry for the mess! =)"

    BIG QUESTION:
    When your school recieved the results of your January Unit 2 results, are the results in UMS or percent? I got 78 for P2. If that was UMS, it's a B obviously, but if it's in %, which means 35/45, then it's an A* I think (can't remember the boundaries off by heart).

    Can anyone tell me whether it's UMS or percent?

    Also, I'll copy this from my post in the other thread:

    For the opinion question, I wrote this:
    No, why shouldn't we? I think this is a stupid question. Space might be dangerous, but so is a lot of things humans do.

    Also, I didn't have a clue about the camera thing, so I wrote:
    Photon Screen. (I think I got made that word up! =))

    I also felt silly for not being able to answer the first page!
    I said that the first one was the angle of refraction.
    I said that the second one was the axis of reflection, with a BIG question mark!
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    its always ums
 
 
 

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