http://img7.imageshack.us/img7/9297/masteringphysicsq1.jpg [Broken] - screenshot of the question

to get the velocity i went 2*pi*18/5.5 which is 20.56 ms^-1

stuck that in mv^2/r -mg = 697.8N, AND I GOT IT WRONG!?

is there something i'm missing?

i did the same thing for the bottom except added mg and got it wrong,

**2.**

ok the first question asks for the normal force at the top, i'm pretty sure the normal force at the top is (mv^2)/r - mg = ( (51kg * v^2 ) / 18m) - mgok the first question asks for the normal force at the top, i'm pretty sure the normal force at the top is (mv^2)/r - mg = ( (51kg * v^2 ) / 18m) - mg

to get the velocity i went 2*pi*18/5.5 which is 20.56 ms^-1

stuck that in mv^2/r -mg = 697.8N, AND I GOT IT WRONG!?

is there something i'm missing?

i did the same thing for the bottom except added mg and got it wrong,

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