1. The problem statement, all variables and given/known data 1. Suppose you leave the solar system and arrive at a planet that has the same mass per unit volume as the earth but has 10 times the earth's radius. What would you weigh on this planet compared with what you weigh on earth ?? 2. Suppose that Kepler had found that the period of a planet's circular orbit is proportional to the square of the orbit radius. What conclusion would Newton have drawn concerning the dependence of the gravitational attraction on distance between two masses. 2. Relevant equations F= -Gm1m2/r^2 3. The attempt at a solution 1. So I use Newton's law of gravitational and get you weigh 1/100 (radius is 10, square is 100) as you do on Earth. I am wrong. So how should I approach this problem ? 2. Can you guys hint me how should I do this one ?