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**1. Homework Statement**

A microwave's turntable spins 3.0 revolutions per minute. It has a 250.0g cup of coffee placed 15.0cm from its centre. Find its period of revolution, its tangential velocity and the centripetal force on the cup.

**2. The attempt at a solution**

period of revolution [tex]\frac{{60}}{3} = 20[/tex] seconds

tangential velocity [tex]\frac{{2\pi r}}{T} = \frac{{2\left( \pi \right)\left( {15} \right)}}{{20}} = 4.7123\,m\,s^{ - 1} [/tex]

centripetal force [tex]\frac{{mv^2 }}{r} = \frac{{0.25\left( {\frac{{2\left( {15} \right)\left( \pi \right)}}{{20}}} \right)}}{{15}} = 0.0785\,N[/tex] towards the centre of the circle

I was wondering if somebody could kindly take the time to look over my working and see if it is correct. Thank you greatly for your time and effort.

unique_pavadrin