1. Which of the following best describes the strength of the gravitational force on Earth due to your mass? a} It is zero as long as you are standing on Earth's surface. b] it is much greater than Earth's gravitational force on you because Earth's mass is so great. c} It is equal in magnitude of the force that Earth exerts on you. d] It is negligible compared to the force of gravity on you because your mass is so small when compared to Earth's mass. 2. Spherical planet A has a mass m and radius r. Spherical planet B has mass 2m and a radius of 4r. How does the gravitational field strength at the surface of the planet B compare to the surface of planet A? a} It is the same as planet A. b] It is twice that of planet A. c} It is halfthat of planet A. d] It is one-eighth that of pla net A. 3. How does a planet's gravity help keep a satellite in a circular orbit? a} It pulls the satellite in the same direction as its motion. b] It pulls the satellite at an angle 30\" to its direction of motion. c} It pulls the satellite at an angle 6D\" to its direction of motion. d] It pulls the satellite at an angle 90'\" to its direction of motion. 4. The period of a satellite is independent of a} its own mass. b] the mass ofthe planet it orbits. c} the value of the gravitational constant. d] the orbital radius. 5. To pinpoint the location of your vehicle with 15 m using a Global Positioning System {EPSL ho'm.I many satellites' signals must interact? a} 1- MI. :13- _ d}4