An artificial earth satellite has a circular orbit of radius 6.64 106 m (which means it is orbiting approximately 280 km above the surface of the earth) in an equatorial plane. The period T (the time required for one complete orbit) is 5.44 10 s (about 1.51 h). (a) Compute the (constant) speed of the satellite. (b) If the satellite is directly above the equator and traveling east at time t, find the average acceleration during the time interval from tto t+ T/40.0. magnitude direction ---Select--- toward the center of the orbit tangential to the circular orbit away from the center of the orbit (c) Find the satellite's instantaneous acceleration at time t. magnitude direction ---Select--- tangential to the circular orbit away from the center of the orbit toward the center of the orbit