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Q. Two antennas located at points A and B are broadcasting radio waves of frequency 94.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 6.20 m. An observer, P, is located on the x axis, a distance x= 61.0 m from antenna A, so that APB forms a right triangle with PB as hypotenuse. What is the phase difference between the waves arriving at P from antennas A and B

Q. A spring with constant k=15 N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. it is then pulled down 6 cm and released. if the ball makes 30 oscillations in 20 seconds, what are its maximum speed?

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