(a) Calculate the orbital inclination required to place a Venus-orbiting spacecraft in a 400 km-by-900 km sun-synchronous orbit. (b) Determine the periapsis and apoapsis for a Mars-orbiting spacecraft whose orbit satisfies all the following conditions: it is sun-synchronous, its argument of perigee is constant, and its period is 7 h.

(a) Calculate the orbital inclination required to place a Venus-orbiting spacecraft in a 400 km-by-900 km sun-synchronous orbit. (b) Determine the periapsis and apoapsis for a Mars-orbiting spacecraft whose orbit satisfies all the following conditions: it is sun-synchronous, its argument of perigee is constant, and its period is 7 h.