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Correct Answer: air ejecting out like that in a balloon
the question asks which method is suitable for propelling a space vehicle. let's explore the different options provided and determine the most suitable method based on the principles of physics and the environment in outer space.
**rotating blades like those used on a helicopter:** in space, there is no atmosphere (air) to interact with. helicopter blades work by pushing against the air to create lift and propulsion. since outer space is a vacuum, there would be no air for the blades to push against, rendering this method ineffective for space vehicle propulsion.
**turbines like those used in ships and boats:** similar to helicopter blades, marine turbines work by pushing against water to propel ships forward. in the vacuum of space, without any water or any other material medium, turbines would also be ineffective. they require a fluid medium to interact with, which is absent in space.
**air ejecting out like that in a balloon:** this method involves ejecting air or gases out of the vehicle, creating thrust in the opposite direction. according to newton's third law of motion, for every action, there is an equal and opposite reaction. when a space vehicle ejects gas outwards, the gas exerts a force on the vehicle in the opposite direction, propelling it forward. this is the basic principle behind rocket propulsion, which is currently the most effective method for moving spacecraft in the void of space.
**none of the above:** given the explanations above, the option "none of the above" does not apply as we have identified that air ejecting (like that in a balloon, though more technically in the form of controlled rocket propulsion) is indeed a suitable method.
in conclusion, the most suitable method for the propulsion of a space vehicle, among the options given, is air ejecting out like that in a balloon. this refers to the basic principle of rocket propulsion, where gases expelled at high speed out of the back of the rocket engine push the spacecraft forward. this method is not only theoretically sound but also practically proven through decades of space exploration.
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