Gravitation 1. An astronaut goes out for a "space-walk" at a distance above the Earth equal to the radius of the Earth. What the gravitational field strength of the Earth at the location of the astronaut? 2. The radius of the Earth is R. At what distance above the Earth's surface will the gravitational field strength of the Earth be half of its value at Earth's surface? 3. A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. The gravitational field strength of Mars at the distance of the satellite, as compared to the gravitational field strength on the surface of Mars, is 4. At a distance of 14000 km from some planet's center, the gravitational field strength is 32 m/s2. What is the gravitational field strength at a point 56000 km from the planet's center