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Mathematics: Post your doubts here!
OOUCH I thought it starts with a vowel... So that's why I feel weird about this question. Sorry, I got the wrong way :P The order should be C-V-C-V-C-V-C-V-C. So that is 5!/2! × 4!/2! -
Mathematics: Post your doubts here!
What does (5P4)/2! mean? I think it should be (4P4)/2! since there are one more consonant than vowel. The order should be vow-con-vow-con-vow-con-vow-con-con. -
Physics: Post your doubts here!
One complete cycle has phase angle 360 deg. 60 deg means one-sixth cycle. T2 is one-sixth cycle behind T1, or 1/6 period behind. According to the graph, the period is 3 sec. T2 is then 0.5 sec behind T1. Graph: -
Further Mathematics: Post your doubts here!
(i) Use conventional quotient rule to get the first, second and third differential. It should turn out that a1 = -1, a2 = 2, a3 = -6 (ii) I don't know if the question asks to suppose a formula first and prove it by induction. If so, then an= n! × (-1)^n. -
Mathematics: Post your doubts here!
y = A (x^n), natural log each side to get ln y = ln A + n (ln x) The gradient is n and y-intercept is ln A. Just draw the line of best fit to find the two values. It should not be hard. -
Physics: Post your doubts here!
It's really labourious to type in the conventional way, and the expression can be vague sometimes. So I prefer "natural displays" of formulae. :D -
Physics: Post your doubts here!
This is not model answer. I typed these using Microsoft Word 2010 which has an "insert formulae" function to make the text very formal. :P -
Physics: Post your doubts here!
You are welcome. And the workings for the rest: 6(b) (b)(i) Magnetic flux in phase with current/voltage in the primary coil (b)(ii) EMF in the secondary coil is proportional to the rate of change of magnetic flux: E= -dΦ/dt (b)(iii) phase difference = π/2 rad (or 90 deg) 7(a) The curve is... -
Physics: Post your doubts here!
But I think A and C are both correct. The density, or total mass per unit volume, is equal to mass per atom × number of atoms per unit volume. P's density is greater than Q's, so MpNp>MqNq. And it says Np=Nq, so Mp>Mq. -
Chemistry: Post your doubts here!
Alright... Then there are 13 C and 18 H left. (26-18)/2 = 4, so 4 double bonds in the aliphatic chain. Plus the one in cyclohexene there are 5. -
Further Mathematics: Post your doubts here!
This question is a little bit hard to understand... It took me some time to get what it means. :P For the first part: -
Chemistry: Post your doubts here!
Deduct the aldehyde group and cyclohexane group, which are CHO and C6H11 respectively. What remains are 13 carbons and 16 hydrogens, and these are involved in the aliphatic chain. Suppose a saturated (no double bonds) aliphatic chain with 13 carbons. The corresponding hydrogen number should be... -
Physics: Post your doubts here!
Count each complete gird as 1 grid and each incomplete one as half grid. This is the standard introduced by the marking scheme. -
Physics: Post your doubts here!
It's a bit confusing T^h/g... Is it T^(h/g) or (T^h)/g ??? If it's the former: ln R = ln [T^(h/g)] = (h/g) ln T On a graph of ln R against ln T the gradient is h/g. If it's the latter: ln R = ln [(T^h)/g] = h ln T - ln g On a graph of ln R against ln T, the gradient is h and y-intercept is - ln g. -
Physics: Post your doubts here!
Count the number of grids in that area and convert to potential value... This should be the most suitable method... -
Mathematics: Post your doubts here!
The square root is not that terrible. It is just used to compensate certain squares. Also to solve this question I think you need to master the trigonometric identities. -
Mathematics: Post your doubts here!
No problem. I shall be ready to help you solve the doubts. :D