• mrgrints Profile Picture

    Mr Grinter @mrgrints

    5 years ago

    A level physics teachers- a bit of help please! Anyone know why D is the answer here?! (My calculation gives 17.7%...) @ChatPhysics #ChatPhysicsLive #ASEChat

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  • benwford Profile Picture

    Ben Ford @benwford

    5 years ago

    @mrgrints @ChatPhysics r = (emf - terminal pd) / current. Abs uncertainty of the bit in bracket is sum of Abs uncertainties of them (because of minus), so (emf - terminal pd) = 1.5 +-0.3 which is +-20%. Current is 5%. Then it's a divide so you combine the percentage uncertainties.

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    Ben Ford @benwford

    5 years ago

    @mrgrints @ChatPhysics Pluses and minuses you combine the absolute uncertainties because they have the same units so can be summed. Multiply and divides you have to combine the percentage uncertainties because your using the percentage to remove the units, so then they can be summed.

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  • CurnowPhysics Profile Picture

    Curnow Physics @CurnowPhysics

    4 years ago

    @mrgrints @ChatPhysics Hi, out of interest where would this question be from? I'm always on the hunt of good uncertainties questions!

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  • Amongus_6999 Profile Picture

    amogus @Amongus_6999

    3 years ago

    @mrgrints @ChatPhysics This man needs to come back absolute W chad found in the wild

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  • TBE09905712 Profile Picture

    TBE @TBE09905712

    4 years ago

    @mrgrints @ChatPhysics It’s been a whole year since his last post…

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  • TBE09905712 Profile Picture

    TBE @TBE09905712

    4 years ago

    @mrgrints @ChatPhysics We found you Thank the hedgehogs

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