A5.0 g coin is placed 15 cm from the center of a turntable. the coin has static and kinetic coefficients of friction with the turntable surface of μs = 0.70 and μk= 0.50. the turntable very slowly speeds up.

what is the angular speed in rpm when the coin slides off?

Explanation:

The coin will slide when the centripetal force is too much for the friction to hold, that is, when it is equal to the maximum static friction, so:

Or:

Which means (since on the vertical direction only the normal and weight are acting):

So for our values we have:

Since , we convert our angular speed using this conversion factor (which is equal to 1 thus not altering our result):

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

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