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Q. Sources A and B emit long-range radio waves of wavelength 530 m, with the phase of the emission from A ahead of that from source B by 90°. The distance rA from A to a detector is greater than the corresponding distance rB from B by 110 m. What is the magnitude of the phase difference at the detector?

Q. A 20kg child is on a swing that hangs from 3m long chains, what is her speed initially at the bottom of the arc if she swings out at a 45 degree angle before reversing action?

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