Calculate the gravitational pull of Earth on a 75 kg astronaut in a space shuttle that is in an orbit 100 km from the surface of the Earth. What is the weight of the same astronaut near the surface of the Earth?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.