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# Weekly Brain Teaser | Consider a vertical wheel of radius 10 cm

Every week we feature a Brain Teaser or a thought-provoking question.

If you have one that you would like to share with fellow engineers, please email it to info@engineeringdaily.net.

So, here is this week’s,

Consider a vertical wheel of radius 10 cm. Now suppose a smaller wheel of radius 2 cm, is made to roll around the larger wheel in the same vertical plane while the larger wheel remains fixed.

What is the total number of rotations the smaller wheel makes when its center makes one complete rotation about the larger wheel?

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