I'm not too good on circular motion questions so please bare with me ;), here's my attempt.

Sort a few things out first:

In case we need it later, angular speed,

At

the car starts to slip inwards, so this means that the friction is acting

**up the slope**, and that the friction is also equal to

where

is the normal reaction of the slope on the car?

Resolving vertically I get

Resolving horizontally I get

We can rewrite the second equation as

, and substituting in our first equation we get

, therefore

?

I have a feeling that Newton's

needs to be used but I'm not sure where?

Not sure how to approach the second question either, this has me a bit stumped.

Thanks in advance for the help