Please help me answer the following question:

Problem 2 The Earth makes one full rotation about its axis in approximately 24 hours, or 86,400 s. It rotates at a constant rate, and its angular speed is @ = $6400 21 - 7.27 x 10 5 rad/s. The Earth's radius is 6.38x10 m. Be sure to show all work. (a): 8 points What is the magnitude of the angular acceleration a of the Earth, in rad/s?? (b): 8 points What is the magnitude of the centripetal acceleration of an object sitting on Earth's equator, in m/s