Should be easy SHM question (1 Viewer)

[J-Wang]

I just can't seem to see what to do, and it is very frustrating because I know it's relatively easy

anyway, the question is: "The period of a particle moving in SHM is 6s and its amplitude is 8cm. Calculate its velocity and acceleration (to 1dp) when the displacement is 5cm from the centre of motion."

i know i need to use v^2=n^2(a^2-x^2) and i also need to use acceleration = -n^2x, but i am struggling. someone please help?

 

[Alkenes]

You can't use the formula since we don't know what is the centre of motion

I just can't seem to see what to do, and it is very frustrating because I know it's relatively easy

anyway, the question is: "The period of a particle moving in SHM is 6s and its amplitude is 8cm. Calculate its velocity and acceleration (to 1dp) when the displacement is 5cm from the centre of motion."

i know i need to use v^2=n^2(a^2-x^2) and i also need to use acceleration = -n^2x, but i am struggling. someone please help?

 

[J-Wang]

You can't use the formula since we don't know what is the centre of motion

well do you know how to do it then? because i was thinking of subbing in two value and solving them simultaneously, but not sure which values to sub in

 

[J-Wang]

nvm. i figured out how to do it

 

[Alkenes]

tell us lol

nvm. i figured out how to do it

 

[Carrotsticks]

tell us lol

You can assume the centre of motion to be the origin because that doesn't change anything. None of the distances given are with respect to the origin, just with respect to the CENTRE of motion, which we will make the origin for simplicity sake.