A Puck on a Frictionless Air Hockey Table Has a Mass

question 5

Multiple Choice

A puck on a frictionless air hockey table has a mass of 5.0 g and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The cord is then pulled from below, shortening the radius to 1.0 m. The new angular velocity (in rad/s) is

• A) 4.0
• B) 6.0
• C) 12
• D) 2.0
• E) 8.0

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