Physics P1 tips, anybody?

[Sticky]

ok so can anyone explain how we get the uncertainty in this question----> june 99/1/question 2

i dont have the paper, please post it here?

[mz]

i dont have the complete paper either, just the compiled mcqs in a book...do you have classified physics or pure 1000 physics mcqs?

[Sticky]

i dont have the complete paper either, just the compiled mcqs in a book...do you have classified physics or pure 1000 physics mcqs?

nop, i have a past paper booklet in year form from june 2000
cant you post the question?

[mz]

how do i attach a photo?

[Sticky]

how do i attach a photo?

when your replying press additional options under the text box

[astarmathsandphysics]

No P1 tips.
Try PG tips

[mz]

oh! thanx! ok so the question might not be so clear so i'll write that down here:
A student attempts to measure the diameter of a steel ball by using a meter rule to measure four similar balls in a row.

The student estimates the positions on the scale as follows:
X-(1.0 +- 0.2)
Y-(5.0 +- 0.2)
What is the diameter of a steel ball together with it's associated uncertainty?
A. (1.0 +- 0.05)
B. (1.0 +- 0.1)
C. (1.0 +- 0.2)
D. (1.0 +- 0.24)

[mz]

and another one

two species of ant have the same shape but all the linear dimensions of the giant ant are X times those of the normal ant. assume that the weight each ant can lift depends only on the cross sectional area of it's muscles.
if the relative strength of an ant is defined as the weight it can lift divided by its own weight, what is the value of the ratio
      relative strength of the giant ant/relative strength of the normal ant?
A. 1/X^3                C. 1
B. 1/X                    D. x

[astarmathsandphysics]

C
5-1=4
error =0.2/sqrt(4)=0.1
this error at either end so C
B wigth it can lift is proportional to X^"
wieght of ant is proportional to volum=X^3
X^2/X^3=1/X

[halosh92]

nov 2008 paper 1  AS cie physics
Q1

[astarmathsandphysics]

In 1s it travels 3*10^8m
number of wavelengths=3*10^8/(600*10^(-9))=3*10^8/(6*10^(-7))=0.5*10^15=5*10^14

[halosh92]

In 1s it travels 3*10^8m
number of wavelengths=3*10^8/(600*10^(-9))=3*10^8/(6*10^(-7))=0.5*10^15=5*10^14

okay thxx
how to do Q4 same paper
thx alot

[astarmathsandphysics]

B

[halosh92]

B

no its D
but how ??

[astarmathsandphysics]

19.8-1%
2.02+1%
looks like they added uncertainty to uncertainty