Question: The earth's radius is 6.37 x 106m; it rotates once every 24 hours. What is the earth's angular speed? Viewed from a point above the north pole, is the angular velocity positive or negative? What is the speed of a point on the equator? What is the speed of a point on the earth's surface halfway between the equator and the pole? (Hint: what is the radius of the circle in which the point moves?)