An ice puck of mass m revolves on an icy surface in a circle at speed v at the end of a horizontal string of length L. The tension in the string is T.

a. Write the equation for centripetal force, and substitute the values T and L appropriately. Then with a bit of elementary algebra, rearrange the equation so that it solves for mass.
b. Show that the mass of the puck is 5 kg when the length of the string is 2 m, string tension is 10N, and the tangential speed of the puck is 2 m/s.

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