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Physics P1 tips, anybody?

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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

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