NEWTON'S LAW OF UNIVERSAL GRAVITATION Activity 3. Think Critically Solve the following problems in a clean sheet of paper. Show your solution and box your final answer. 1. What is the gravitational force of attraction between the earth 5.98 x 10"" kg and a 70 kg boy who is standing at sea level, a distance of 6.38 x 10' m from earth's center, m1 = 5.98 x 10* kg, m2 = 70 kg , r= 6.38 x 10* m, G = 6.6726 x 10""* Nm /kg?? 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 34 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