Let a spacecraft in permanent orbit around the earth be used for delivering payloads from leo to geostationary (gso) orbit. before each flight from leo the spacecraft is refueled with propellant which it uses up in its round trip to gso and back. the outbound leg requires four times as much propellant as the inbound return leg. the delta-v for hohmann transfer from leo to gso is 4.22 km/s. the specific impulse of the propulsion system is 430 s. if the payload mass is to be 3500 kg, calculate the mass of the empty vehicle.

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measure their densities same density, same sub

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

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friction

explanation:

they us to move forward and backwards