# Thread: Mechanics Question

1. ## Mechanics Question  Reply With Quote

2. ## Re: Mechanics Question Originally Posted by 1729 Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):  Reply With Quote

3. ## Re: Mechanics Question Originally Posted by InteGrand Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):

 Spoiler (rollover to view):
Do you use Newton's Second Law tangentially to show

With

Wouldn't it then be and how come instead of  Reply With Quote

4. ## Re: Mechanics Question Originally Posted by 1729 Do you use Newton's Second Law tangentially to show

With

Wouldn't it then be and how come instead of  Reply With Quote

5. ## Re: Mechanics Question Originally Posted by 1729 how come instead of  Reply With Quote

6. ## Re: Mechanics Question Originally Posted by InteGrand Why do we only consider half of the entire arc? Is it because the net force would then be 0?

Also what is the physical significance of integrating from  Reply With Quote

7. ## Re: Mechanics Question Originally Posted by 1729 Why do we only consider half of the entire arc? Is it because the net force would then be 0?

Also what is the physical significance of integrating from  Reply With Quote

8. ## Re: Mechanics Question Originally Posted by InteGrand Thank you  Reply With Quote

9. ## Re: Mechanics Question

Another mechanics question (sry trying to self-learn)

I let x = 0 be the wharf and t = 0 be at 1:10 am which would mean the endpoints of the tidal motion are x = -1 and x = 0.4. Since we are told it is SHM, we can deduce

Can we immediately deduce b = -0.3 since it is the centre of motion and a = 0.7? And if t is in hours, the period would be 12 hours and 25 minutes or T = 149/12 which would make n = 24pi/149.

And using and dx/dt = 0 when t = 0 I got alpha = 0.

Meaning I got which is clearly wrong since at t = 0, x = 0.4 and not x = -1. What have I done wrong?

Screen Shot 2018-04-17 at 2.30.37 am.png  Reply With Quote

10. ## Re: Mechanics Question Originally Posted by 1729 Another mechanics question (sry trying to self-learn)

I let x = 0 be the wharf and t = 0 be at 1:10 am which would mean the endpoints of the tidal motion are x = -1 and x = 0.4. Since we are told it is SHM, we can deduce

Can we immediately deduce b = -0.3 since it is the centre of motion and a = 0.7? And if t is in hours, the period would be 12 hours and 25 minutes or T = 149/12 which would make n = 24pi/149.

And using and dx/dt = 0 when t = 0 I got alpha = 0.

Meaning I got which is clearly wrong since at t = 0, x = 0.4 and not x = -1. What have I done wrong?

Screen Shot 2018-04-17 at 2.30.37 am.png Originally Posted by 1729 And using and dx/dt = 0 when t = 0 I got alpha = 0.  Reply With Quote

11. ## Re: Mechanics Question Originally Posted by InteGrand Thank you  Reply With Quote