A smooth circular hoop with a radius of 0.900 m is placed flat on the floor. A 0.325-kg particle slides around the inside edge of the hoop. The particle is given an initial speed if 7.00 m/s. After one revolution, its speed has dropped to 5.50 m/s because of friction with the floor. Find the energy transformed from mechanical to internal in the particle-hoop-floor system as a result of friction in one revolution