A 5500 kg spacecraft is in a circular orbit 1500 km above the surface of Mars (mM = 6.42 1023 kg. RM = 3.39 106 m). Part A How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 3500 km above the surface? Express your answer with the appropriate units. ? W = Value Units Submit Request Answer Provide Feedback Next > Review | Constants Mass M is distributed uniformly over a disk of radius a. Figure 1 of 1 m Part A Find the gravitational force (magnitude and direction) between this disk-shaped mass and a particle with mass m located a distance above the center of the disk (the figure (Figure 1)) (Hint: Divide the disk into infinitesimally thin concentric rings, use the expression F= GMmz for the gravitational force due to each ring of radius r, and integrate to (+2+22)3/2 find the total force.) Express your answer in terms of a, G, M, m, x. VA ? M F = Submit Request Answer Part B Would the astronaut find it difficult to keep from being torn apart by the gravitational forces? This tension is less than that which could be sustained by human tissue, so there is no danger for the astronaut. This tension is much larger than that which could be sustained by human tissue, and the astronaut is in trouble. Submit Request Answer Part C Is the center of gravity of her head at the same point as the center of mass? The center of gravity is not at the center of mass, their separation is small compared to the radius of the orbit. The center of gravity is match with the center of mass. Submit Request Answer