uniform circular motion

Let u=tanλ, see te figure for analysis

圖片參考：http://imgcld.yimg.com/8/n/HA00140412/o/701007250069613873372098.jpg


2010-07-25 16:57:35 補充：
(a)
At what speed would the bus start to skid outwards?
v^2 = grtan(θ+λ)

(b)
At what speed would the bus start to overturn inwards?
v^2=grtan(θ-α)

It is very rare to overturn inwards(as I have mention, it is because if that happens the bus will even topple when it is at rest on the banking)

2010-07-25 16:57:39 補充：
I guess you ask at what speed would the bus start to verturn outwards( i.e. away from centre)
v^2=grtan(θ+α)

2010-07-25 16:57:46 補充：
(c)
What is the range of the speedfor turning this corner safely?
See above

Note that
α is the angle between the vertical and the symmetry axis about the bus,
α = a/h
h = height of CG above the ground.

2010-07-25 17:00:26 補充：
Your qestion don't give enough information to get the exact anumerical answer.
This time you miss out:
The angle of banking
The geometry of the bus(e.g. height of CG, distance between two pairs of wheel)