A 1-kg disk slides on a smooth horizontal table and is attached to a string that passes th...

A 1-kg disk slides on a smooth horizontal table and is attached to a string that passes through a hole in the table. A constant force T = 10 N is exerted on the string. At the instant shown, r = 1 m and the velocity of the disk in terms of polar coordinates is v = 6eθ(m/s). Use conservation of energy to determine the magnitude of the velocity of the disk when r = 2 m. (See Problem 15.99.)