Explanation:
Geostationary satellite has orbital period equal to Earth's rotation (24 hours) and orbits in equatorial plane in same direction. It appears stationary from Earth's surface. Altitude about 36,000 km. Used for communication.
Explanation:
Copper has free electrons, very low resistivity, excellent conductor. Glass, rubber, wood are insulators. Silver best conductor, but copper widely used. Graphite conducts but non-metal.
Explanation:
Damping opposes the motion of an oscillator (like a pendulum in thick oil). In 'underdamped' systems, it oscillates with decaying amplitude. In 'critically damped' systems, it returns to equilibrium as fast as possible without oscillating. In 'overdamped' or heavily damped systems, the resistive force is so strong that it slowly creeps back to equilibrium without ever crossing it to oscillate.
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