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Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. These are called geosynchronous orbits. The radius of the earth is , and the altitude of a geosynchronous orbit is ( 22000 miles).
A) What is the speed of a satellite in a geosynchronous orbit?
B) What is the magnitude of the acceleration of a satellite in a geosynchronous orbit?
Light from a helium-neon laser (wavelength=649 nm) passes through a circular aperture and is observed on a screen 2.36 m behind the aperture
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Far in space, where gravity is negligible, a 480-kg rocket travelling at 95 m/s fires its engines. The figure shows the thrust force as a function of time. The mass lost by the rocket all through these 30s is negligible.
A lamp (R = 148 ), an electric heater (R = 23 ), and a fan (R = 48 ) are connected in parallel across a 117 V line. What is the voltage across the fan
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