Final answer:
A seal is indeed used to prevent leakage between a stationary part and a moving part, which is true.
Step-by-step explanation:
The statement that a seal is used to prevent leakage between a stationary part and a moving part is True. Seals are crucial components in various engineering applications to prevent the escape of liquids or gases, especially in machinery where one part moves relative to another, such as in engines, pumps, and valves.
Regarding the planet-satellite system and Kepler's laws of planetary motion, the statement that a planet-satellite system must be isolated from other massive objects to follow Kepler's laws is False. While Kepler developed his laws based on observing a two-body system (a planet and the sun), in a real-world scenario, other gravitational forces can affect the orbit. Nonetheless, Kepler's laws are a good approximation for most planetary motion in our solar system.
The statement that an external force is required to set a stationary object in motion in outer space away from all gravitational influences and atmospheric friction is True. According to Newton's first law of motion, an object at rest will stay at rest unless acted upon by an outside force.