5) A child is sitting on the outer edge of a merry-go-round that is 18 m in diameter. If the merry-go-round makes 7.8 rev/min, what is the velocity of the child in m/s? A) 5.1 m/s B) 14.6 m/s C) 1.2 m/s 7.3 m/s 6) A torque of 12 N m is applied to a solid, uniform disk of radius 0.50 m. If the disk accelerates at 6.3 rad/s², what is the mass of the disk? (Idisk = 1/2 m R²) A) 7.5 kg B) 3.8 kg C) 11 kg D) 15 kg 7) A potter's wheel (a solid, uniform disk) of mass 7.0 kg and radius 0.65 m spins about its central axis. A 2.1 kg lump of clay is dropped onto the wheel at a distance 0.41 m from the axis. Calculate the rotational inertia of the system. A) 2.5 kg. m² B) 1.5 kg. m² .m2 1.8 kg.m2 D) 0.40 kg. m²