Gil is having a bad day. He spilled coffee on his white shirt while walking back to his desk because his stride rate (90 steps per minute) produced a standing wave in the cup with a node in the center of the cup and antinodes at the sides. If the “coffee waves” travel at 36 cm/s, how wide is Gil’s cup?

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Gil is having a bad day. He spilled coffee on his white shirt while walking back to his
desk because his stride rate (90 steps per minute) produced a standing wave in the cup
with a node in the center of the cup and antinodes at the sides. If the “coffee waves”
travel at 36 cm/s, how wide is Gil’s cup?

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