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# Basic Mechanics - Round 2 watch

1. Hiya, I need help on these two questions, please.

I know these aren't even hard but I can't for the life of me remember how to work out the difference in height. I know I'm missing something completely obvious so someone please put me out of my misery.
2. (Original post by ElMoro)
Hiya, I need help on these two questions, please.

I know these aren't even hard but I can't for the life of me remember how to work out the difference in height. I know I'm missing something completely obvious so someone please put me out of my misery.
You're right, it is obvious. In the first one, for example, note that OP is still of length a. Now if you drew a horizontal line from P to OA such that, if the intersection of OA and this line is given by the point X, OXP is a right angle triangle. From which you can work out the length OX by using SOHCAHTOA in terms of a. Then just OA - OX.
3. (Original post by Farhan.Hanif93)
You're right, it is obvious. In the first one, for example, note that OP is still of length a. Now if you drew a horizontal line from P to OA such that, if the intersection of OA and this line is given by the point X, OXP is a right angle triangle. From which you can work out the length OX by using SOHCAHTOA in terms of a. Then just OA - OX.
Haha, I always make that mistake.

Thanks for the help. No. 10 looks ok now aswell, I think. Doing chemistry now.
4. (Original post by ElMoro)
Haha, I always make that mistake.

Thanks for the help. No. 10 looks ok now aswell, I think. Doing chemistry now.
No worries. I can't remember whether that was M2 or M3? I take it that it's M2 since you only really need to be dealing with energy changes on a particle on a vertical circle rather than consideration of it's transverse acceleration.
5. (Original post by Farhan.Hanif93)
No worries. I can't remember whether that was M2 or M3? I take it that it's M2 since you only really need to be dealing with energy changes on a particle on a vertical circle rather than consideration of it's transverse acceleration.
Yeah, it's M2. Just got 7 or so chapters left then I shall be starting M3.

I take it, you've done both?

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