A 120-mm-diameter hole is cut as shown in a thin disk of 600-mm diameter. The disk rotates...

A 120-mm-diameter hole is cut as shown in a thin disk of 600-mm diameter. The disk rotates in a horizontal plane about its geometric center A at the constant rate of 480 rpm. Knowing that the disk has a mass of 30 kg after the hole has been cut, determine the horizontal component of the force exerted by the shaft on the disk at A.