Circular Motion Question

[Vincezor]

I have no idea how to approach this question at all (see attached)  


Any advice would be much appreciated


Solutions (Thanks Zien!)





(as they are attached together)

[Zien]

Taking g=10, the tension of the string attached to the 5kg swinging around would be 10N (provided by the 1kg weight). Since we know that there is a centripetal (net) force acting towards the centre of the circle, this is equal to the tension created by the 1kg weight (i.e. 10N).

Using the formula, F = mv^2/r,
10 = 5*(2)^2/r
r = 5*(2)^2/10
r = 2 metres


You better wait until someone else responds to this; I have a level of uncertainty with the tension bit. :/

[Vincezor]

Oh thanks! that was a fast reply

Yep the answer says it was 2m, I guess I was unsure how to use the 1kg mass attached 

Thank you very much! I'll edit the solutions into the first post

[Zien]

No problems! Glad to help. ^^

[schnappy]

Anti-gravity!

/mind blown