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(a) What is the centripetal acceleration of the child?

(b) What force (magnitude and direction) does the seat exert on the child at the lowest point of the ride?

(c) What force does the seat exert on the child at the highest point of the ride?

(d) What force does the seat exert on the child when the child is halfway between the top and bottom?

Ok I need to know theory and a few questions about how to find Angular Velocity.

I understand V=RW. I also understand I can take the A=v2/r to get the centripetal acceleration.

I forgot how to take 4 revs per minute and convert it over to a angular velocity using a radius of 8.5.

but even when I finally get the angular velocity and centripetal acceleration, I am not sure how B,C, and D will be getting different answers. Since it is a radius shouldn't they all share the same distance and gravity values? Wether it is the highest point and lowest point they share the same distance and weight doesn't change??

Angular velocity...I take the distance of the circle, which would be 17*Pie=53.4.

So it revolutes 4 times per minute. This is where I am drawing a blank...this stuff use to be so easy for me 2 years ago but I am seriously drawing a blank here...ugh