Understanding Uniform Circular Motion on a Rotating Merry-go-round

[byyao]

i got it already, thanks.

 

[berkeman]

On a rotating merry-go-round a weight is hanging from a string,
As seen from the outside it hangs at an angle to the vertical.
How does the outside observer explain that?
The observer on merry-go-round does not see the outside world. How does he (or she) explain the angle?

I don't really get this one...need help please~

What don't you get? Show us a free body diagram for the weight and string. List the relevant equations for uniform circular motion. There's a reason that the Homework Help Template (that you deleted when posting) asks for the Relevant Equations and your Attempt at a Solution.