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This question would be more suited in physics section.

yeah but they hardly ever have physics people on here

Haha

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yes he can be anywhere it doesn't matter..

it says in the question 5 times each minute

i dont know where to start on this one

"..when the rider is halfway between top and bottom?"
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ok

ok

and thats for start

5/60?

nope

can you do it?

Yes, it's a pretty easy operation, but I think you'll get more satisfaction if you try it yourself.

I already did try, i couldn't do it

Would it be 90m/s

no idea?

May be the answer would be,
5300N clockwise

Try posting this in the physics section.
Surely you would get an answer.

how did you get that

i think thats wrong

i got 4.71 after i multiplied it by 9

so 388.76? is this correct, i only have 1 attempt left?

You need magnitude and direction. What is the direction of the force vector?

How did you get 388.76? What are the units of that number?

Did you get 2.467 m/s^2 for the centripetal acceleration?