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Q. A heavy ball with a weight of 100 N is hung from the ceiling of a lecture hall on a 4.5-{rm m}-long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.8 m/s as it passes through the lowest point. What is the tension in the rope at that point?

Q. How thick (minimum) should the air layer be between two flat glass surfaces if the glass is to appear bright when 530 light is incident normally?

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