An Earth satellite moves in a circular orbit 750 km above Earth's surface (REarth = 6.37 x 105 km) with a period of 98.0 minutes. What are (a) the speed and (b) the centripetal acceleration of the satellite? A rotating fan completes 1100 revolutions every minute. Consider the tip of a blade, at a radius of 0.15 m from the center. (a) What distance does the tip travel in one revolution? (b) What is the period of the motion? (c) What is the tip's speed? (d) What is the tip's acceleration? Calculate the earth's gravitational force on a 75.0 kg astronaut who is repairing the Hubble Space Telescope 600 km above the earth's surface, and then compare this value with his weight at the earth's surface. In view of your result, explain why we say that astronauts are weightless when they orbit the earth. Is it because the gravitational pull of the earth is negligibly small