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Q1. A water-skier is moving at a speed of 14.7 m/s. while she skis in the same direction as a travelling wave, she springs upward every 0.870 s due to the wave crests. When she skis in the direction opposite to that in which the wave moves, she springs upward every 0.614 s in response to the crests. The speed of the skier is greater than the speed of the wave. Determine (a) the speed and (b) the wavelength of the wave.

Q2. On your wedding day your lover gives you a gold ring of mass 3.98 g. 59 years later its mass is 3.73 g. On the average how many atoms were abrated from the ring during each second of your marriage? The atomic mass of gold is 177 u.

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