Year 13 Maths Help Thread

can someone help me with question as well please (last one sorry!)

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can someone help me with question as well please (last one sorry!)

My mistake, you are correct, k is pi/6. This gives the correct answer

For part a, resolving the mass vertically, why don't you have to consider a reaction force of R on Q, the mark scheme says 15g-T=15a, but I wrote 15g-T-R=15a and I couldn't solve as there were three unknowns.

When you resolve forces, all the forces should be acting on the same particle. The reaction force on Q only acts on Q so you could use it in your working but only if you're considering the forces on Q only.

So you could do this if you're really careful : resolve for Q, R and the triangle separately but most students are bound to make mistakes if they try this.

There is a much easier way...

In M1 always look for connected particles whose forces all act in the same straight line. You can treat this kind of system as one particle.

So here you can treat Q, R and the (light) triangle as one particle of mass 15kg. So the only forces acting on this combined particle are tension and 15g.

s2 solomon d q4

for q4 part but why is the x~Po (8/6) as it does say given its on the day it is open so why don't u do 8/7 as there's 7 days in a week and it doesn't say given the shop is open so how are you supposed to know it is referring to the days it is open?is it a badly worded q?
Also can someone explain part c as I let s be the number in stock and worked out
P (X>s)<0.05 and found some but it was wrong
This is s2 edexcel solomon d

Can anyone please help explain question 15 ii?

Use you sketch. 15(i) says to find the maximum value for |z|, give the condition that |z-w| = 2. i.e. what point on that locus of z has the greatest magnitude (is furthest from the origin)?

Okay so for part a, lzl I got √10 +2 for the maximum value and √
10 - 2 for the minimum value.
I did that assuming that the distance from the origin through the center would give me the furthest distance.
But what I don't get is part b?

Part b is actually almost exactly the same. Part a asks you to find the maximum and minimum distance from the locus to the origin, or |z-0| which we write as just |z|. Part b asks you to do the same but not for the origin, rather the point x where x= 3. Do you understand why?

Yeah this is potentially a badly worded question, this sort of thing will get noticed and changed before the actual exams are released. Solomon papers don't go through the same rigorous processes as actual exam papers.

For part (c) would you mind showing your working? I'd prefer to get you to work out the correct answer rather than just giving you a correct method...

Yeah this is potentially a badly worded question, this sort of thing will get noticed and changed before the actual exams are released. Solomon papers don't go through the same rigorous processes as actual exam papers.

For part (c) would you mind showing your working? I'd prefer to get you to work out the correct answer rather than just giving you a correct method...