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Old Apr 1st 2017, 11:34 AM   #1
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Question Another circular motion question

Hi, I've got another question.

question and diagram - https://ibb.co/daf21F

Im doing question 2aiiia

I thought that since radial force = mv²/r = 64m N and the transverse force = m*angular acceleration = 0, The magnitude and direction of the force is 64m N towards the centre. However, according to the book the answer is 73.8m N towards the centre.

Where have I gone wrong?
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Old Apr 1st 2017, 01:28 PM   #2
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$F_c = F_r - mg \implies \dfrac{mv^2}{r} = F_r - mg \implies F_r = \dfrac{mv^2}{r}+mg$

$F_r = m\left(\dfrac{v^2}{r} + g\right)$

recalculate ...
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Old Apr 2nd 2017, 01:48 AM   #3
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Thanks skeeter.
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