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Radians, arc distance travelled, angular velocity, HELP!!!

Hey guys, I recently got given an engineering assignment. There's two tasks I can't do so here's one of them, please help.

A pin in part of a mechanical mechanism rotates with a radius of 150mm and is
observed to turn through an arc of 0.7 radians in 9 seconds. Determine...

a, The arc distance travelled by the pin

b, The angular velocity of the pin in radians per second and in revs per minute

c, The linear tangential velocity of the pin in m/s


I was on holiday for a week so I missed the radians lessons, all I know if theres 2 pie radians in 360 degrees, I think :smile:

Your help would be greatly appreciated. Thanks.
Reply 1
Look up the formulae in a standard mathematics book or online. Read any material on angular displacement/ velocity. Nasa has a good website on this, search for it in google.

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