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Physics: Post your doubts here!

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Lyfroker said:
Q4, 5, 15
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
Click to expand...


Q4-

LHS = RHS
The units must be cancelled out so that nothing remains. First, you cancel out all the constants:
L x 1/P = Q x T^2 [We know L is m and T is s]
m x 1/P = Q x s^2 [To cancel the s^2, Q must have s^-2]
Now substitute the units given in options:
(B) m x m^-2 = m x s^-2 x s
Giving m = m

Q5-

Basically what they are asking is to first find the PERCENTAGE UNCERTAINTY. Eg, for A- 0.002/2.043 x 100% gives 0.097%.
Find out for other options. You will see that B- has 3.7% and D- has 3.85%. But it doesn't end here. (B) is d, and in the equation the d is multiplied by d again. So multiply the uncertainty giving you value greater than (D).

Q15-

Total AC moment = Total C moment.
The rings are of same mass.
7xm + Yxm = 5x2m [Subs m as 1 for simplicity]
7 + y = 10
y = 3
[8 from pivot minus 3 = 5.]
Ans is hence (C)


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