A landing craft with mass 12,500 kg is in a circular orbit 5.75 X 10 m above the surface of a planet. The period of the orbit is 5800 s. The astronauts in the lander measure the diameter of the planet to be 9.60 X 10" m. The lander sets down at the north pole of the planet. What is the weight of a 85.6-kg astronaut as he steps out onto the planet's surface?