2. What is the gravitational field strength at the surface of the moon if its mass is 1/80 times the mass of the earth and its diameter % times the diameter of the earth? 3. A satellite orbiting the earth in a circular orbit is at two earth radii from the surface of the earth. a. What is the acceleration due to gravity on the satellite? b. What is the weight of a 65 kg astronaut in the satellite? c. Explain why the person astronaut feel "weightless". 4. The rocket is at height of 150 km above the Earth. Thus, the distance r in which is measured from the center of the Earth, is equal to the Earth's radius plus 150 km. What is the escape velocity required for a circular orbit at this height