3. Congratulations!! You have just been selected as prospective commander of the Mars Orbital Mission (MOM). Your task is to place your spacecraft in circular orbit about Mars with an orbital period of 8 hours and 40 minutes. The mass of Mars is 6.45 x 102 kg, and the radius of Mars is 3394 km. What will be the radius of your circular orbit? 4. In the diagram the beam is uniform, has length L, and weighs 200 N. If W = 800 N, find (a) the tension 50 In the rope, and (b) the horizontal and vertical forces, H and V, exerted on the beam by the wall