Can you please help me understand these please:

So far in your life, you may have assumed that as you are sitting in your chair right now, you are not acceler-ating. However, this picture is not quite complete! You are on the surface of the Earth, which is rotating. While answering the following questions you may ignore the Earth's motion around the sun, galactic center, etc. (though that is another interesting question!)

(a) What is the magnitude of the acceleration of a person sitting in a chair on the equator?

(b) At the equator, is your mass times the gravitational acceleration of the Earth greater than, less than, or equal to the normal force exerted on you by the chair you are sitting on? Explain.

(c) A classmate of yours asks you why we have ignored this acceleration for the whole first term of physics. "Is everything we've learned a lie?" they ask. Ease their fears by calculating the percentage difference between the normal force from the chair and your weight while sitting on equator.

(d) The latitude of Corvallis is 44.4. What is your acceleration while sitting in your chair?