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Q. A 100 ball on a 60 long string is swung in a vertical circle whose center is 200 above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 above the floor. What the tension in the string the instant before the string broke?

Q. The reactant concentration in a first-order reaction was 7.50×10-2 after 45.0 and 9.10×10-3 after 85.0 . What is the rate constant for this reaction?

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