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Physics: Post your doubts here!

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Psyvlone007

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hellodjfos;s'ff said:
A few of my friends are giving it, but i am done with my practical(v33). My friends told me there will be a water/thermodynamics experiment. You can ask around if anyone else knows the details about which type of experiments are coming up.
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Brother can you plz ask aroud for a little more detail. In my city such thing are wayy tooo diffivult to find.
 
hellodjfos;s'ff

hellodjfos;s'ff

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Krypton36 said:
Okay! So if I get the percentage uncertainty of a measured value as 14% and my constants have %uncertainty of 25% then my value is proportional within the limits right??

I’ve been doing this! Just got confused...
Just out of curiousity, I wanted to know what you do at your side of the globe! Lol!
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You can say it is/it isn't within limits of experimental accuracy, as long as you explain your answer, you would get the mark. Your explanation should relate to the percentage uncertainty of a measured value you found in the previous parts(as you mentioned).
 
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ba-lock-ey

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Krypton36 said:
How do we show if a constant is within the limits of experimental accuracy or not? What method would be best for such questions??
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(LargeK-SmallK)/LargeK *100
AND
(LargeK-SmallK)/SmallK *100

Both percentages can be up to 10% or 20% depending on which you choose but you have to state which percentage you choose. Tell that it is within or out of limits of experimental accuracy in the end.
 
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ba-lock-ey

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hancy pandey said:
Will electricity be coming in tomorrow Physics practical 34?
Any guess papers?
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We don't know but it is better to STUDY electricity as knowledge beforehand is required to make sure the values you receive make sense. For example, you may get a value of current after calculations as 10A which is too much in a normal school practical. Mechanics however, is told directly and any mistakes is purely because questions are not read properly by the student.
 
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ba-lock-ey

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IN NEED OF HELP said:
Bro do you have any idea about Physics 34 tmr? What sort of questions are there?
Can you relate any with the old years of past paper?
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Not a guy but I'm sure we'll have electricity. I've skimmed through EVERYTHING and electricity is the most obvious. It'll probably be related to resistors as this is quite common. Once again, I'm not 100% right but let's say 62% :(
 
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ba-lock-ey

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IN NEED OF HELP said:
Any idea on thermodynamic experiment?
Have you ever seen water tub experiment in past paper before?
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Using water overall, yes! Liquids and other random materials like rice (we had this once) are used in the second experiment. The feb/march 2018 paper had one of the weirdest question 2s I've ever seen. It was too 'graphical' to make head or tail of that practical but it might've been easier to annotate the whole thing in the lab than on the screen. :D
Water was poured in a plastic bottle which was made to oscillate . . . yada yada. I'm sure you get the hang of it. Two volumes, different times.
 
AvinnaMalla

AvinnaMalla

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ba-lock-ey said:
(LargeK-SmallK)/LargeK *100
AND
(LargeK-SmallK)/SmallK *100

Both percentages can be up to 10% or 20% depending on which you choose but you have to state which percentage you choose. Tell that it is within or out of limits of experimental accuracy in the end.
Click to expand...

I think you could also do (K1-K2)/(Smallest Value of K) *100. This should give you the Maximum difference in values of K1 and K2 (The worst case scenario If you will). This difference should not exceed 10%. If it is greater, your experiment does not support the relationship. Do we actually have to do both? or just one is enough?


Also heard we're doing a Drop some Masses into a tub full of water and note the time taken for the Ball to drop tomorrow. Anyone has any Similar paper to that and?or a few limitations and suggestions?
 
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ba-lock-ey

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AvinnaMalla said:
I think you could also do (K1-K2)/(Smallest Value of K) *100. This should give you the Maximum difference in values of K1 and K2 (The worst case scenario If you will). This difference should not exceed 10%. If it is greater, your experiment does not support the relationship. Do we actually have to do both? or just one is enough?


Also heard we're doing a Drop some Masses into a tub full of water and note the time taken for the Ball to drop tomorrow. Anyone has any Similar paper to that and?or a few limitations and suggestions?
Click to expand...
check Znotes
 
B

ba-lock-ey

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IN NEED OF HELP said:
Way to calculate percentage uncertainty of screw gauge?
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The screw of this instrument has 2 threads per millimeter so that it advances .5 mm for each revolution. Since there are 50 divisions around the rim, the least count and the uncertainty of this instrument is 1/50 x 0.5 mm = 0.01 mm. In reading the rim of the instrument, one must determine whether the barrel is on its first or second revolution after a main scale division (one can determine this by simple inspection).

Copied from https://physics.appstate.edu/laboratory/resources/measurement-and-uncertainty
 
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