What velocity would a proton need to circle earth 1400 km, Ask an Expert

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Q. What velocity would a proton need to circle Earth 1400 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4 x10-8 T?

Q. A rocket engine emits 2.0 X 10^5J of sound energy every second. The sound is emitted uniformly in all directions. what is the sound intensity level, measured relative to the threshold of hearing, at a distance of 85m away from the engine?

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