News on physics practical 34

[Ash1994]

if question 1 is on moments then here is a type of experiment that involves a nail too =P

 

[hudiiny]

So what is the Uncertainty of
-Syringe
-StopWatch?

i texted my teacher..he hasnt replied yet..:S if you get to know from somewhere else do tell me as well please

 

[TheBeast]

btw i just asked my Sir...he said just (0.1/value) times 100 gives % uncertainity/error.

thanks...so the same could be said abt the vernier caliper?

 

[hudiiny]

thanks...so the same could be said abt the vernier caliper?

except that uncertainity of a vernier calliper is 0.01 cm.

 

[TheBeast]

except that uncertainity of a vernier calliper is 0.01 cm.

yeah right...

 

[Binod Shakya]

question 2 is new...and for question 1 o/n 2005

This is good but there is some modification
this year pivot is used

 

[Binod Shakya]

most of the people are saying that no electricity question(100%)
there is a question related heat like in this paper http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_33.pdf
question 2

Apparently not
There is something new but related to heat for sure

 

[mrnt3250]

yeah right...

0.01 millimeters!
The top scale has a smallest reading of 1 millimeter, and the lower one (written on it) is usually 0.02 mm.
So uncertainty half the smallest division, 0.02 mm /2 = 0.01 mm

 

[hudiiny]

0.01 millimeters!
The top scale has a smallest reading of 1 millimeter, and the lower one (written on it) is usually 0.02 mm.
So uncertainty half the smallest division, 0.02 mm /2 = 0.01 mm

Are they not in cm !? You are confusing me now :s

 

[TheBeast]

Are they not in cm !? You are confusing me now :s

its 0.01 cm or 0.1 mm...and not 0.01 mm

 

[TheBeast]

and also to how many decimal places, do we quote time?

 

[sufyanalizaib]

WTF yr...pls dnot confuse me atleat on this stage

 

[Usman Ismail]

I told my sir about heat..he laughed and said theres no thermometer asked in the aparatus.

how to calculate rate of flow???

 

[mrnt3250]

Are they not in cm !? You are confusing me now :s

DO NOT confuse urself!
The top scale has smallest division (smallest line) equal to 1 millimeter.
The lower smaller scale has the smallest division (line) written on it which is usually 0.02 mm.
So the least count of this device is 0.02 mm and half of it is 0.01 mm.

 

[hudiiny]

its 0.01 cm or 0.1 mm...and not 0.01 mm

Yaah that makes sense thanks

 

[hudiiny]

how to calculate rate of flow???

You will mark two points for instance 50 cm3 and 30 cm3 ....u will note the time taken for water to flow frm 50 to 30.....then volume divide by time...in this example 50-30=20 divided by time frm stopwatch.

 

[hudiiny]

and also to how many decimal places, do we quote time?

2 d.p.

 

[sufyanalizaib]

hy search on google tthe uncertainity in verniar is 0.01 cm....

 

[Dukeofwin]

i texted my teacher..he hasnt replied yet..:S if you get to know from somewhere else do tell me as well please

This is bad!
I got to know Stopwatch has 0.1second
while for the syringe it depends on the calibration! If 1CC(cm^3) is covered in 10 divisions then Uncertainty is 0.1cm^3.
But I'm not sure about StopWatch My another teacher said it was 0.01 seconds plus our reaction error (which is approx. 0.3)

 

[TheBeast]

2 d.p.

thanks...and when calculating % difference between two values, which one is the denominator?