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Mechanics 3 help needed Urgently

I need help in the question which i have attached with this post, the solution of the question is also attached with this post. My doubt is in part b of the question, i am not understanding how the amplitude is being found.

Can somebody please help me quickly because tomorrow i have m3 exam.

Thanks in advance.
m2.png149.1KB
m3 2.png38.8KB
Reply 1
Avatar for Hopple
Hopple
18
The amplitude is the distance between the equilibrium position and where it is at rest. You've already found the equilibrium position in part a, and the question tells you it is at rest at C (starts there).
Reply 2
Avatar for raheem94
raheem94
OP
13
Original post by Hopple
The amplitude is the distance between the equilibrium position and where it is at rest. You've already found the equilibrium position in part a, and the question tells you it is at rest at C (starts there).


So is the calculated amplitude in this question( the question attached with this post, this isn't the same question) correct. The solution is also attached with this post.
m3 2.png75.9KB
m2.png120.4KB
Reply 3
Avatar for Hopple
Hopple
18
I'd have said the amplitude was 0.5m :s-smilie:

Is the bit cut off the solution image of any relevance? It's possible they typo'd the question, so AC is supposed to be 2.4m
(edited 12 years ago)
Reply 4
Avatar for raheem94
raheem94
OP
13
Original post by Hopple
I'd have said the amplitude was 0.5m :s-smilie:

Is the bit cut off the solution image of any relevance? It's possible they typo'd the question, so AC is supposed to be 2.4m


Thanks for your reply.
I have included the cut part of the solution now. So can you ensure me what the correct answer is?

Please reply because my exam is tomorrow.

Thanks in advance.
m2.png189.7KB
Reply 5
Avatar for Hopple
Hopple
18
Yeah, it must be a typo. Their steps are correct, even if their numbers aren't - they probably meant AC should be 2.4m, which would put the starting rest position 0.4m from the equilibrium position and then everything else works.
Reply 6
Avatar for raheem94
raheem94
OP
13
Original post by Hopple
Yeah, it must be a typo. Their steps are correct, even if their numbers aren't - they probably meant AC should be 2.4m, which would put the starting rest position 0.4m from the equilibrium position and then everything else works.


Thanks, this example from the book just confused all my previous concepts.

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