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Question: You are analyzing rocks that contain small amounts of potassium-40 and argon-40. The half-life of potassium-40 is 1.25 billion years. Assume that when the rocks initially formed they did not contain any argon-40.
(a) You find a rock that contains equal amounts of potassium-40 and argon-40. How old is it? Explain.
(b) You find a rock that contains three times as much argon-40 as potassium-40. How old is it? Explain.
Suppose the first stage of a two-stage rocket has total mass 1.30×10^4 kg, of which 1.10×10^4 kg is fuel. The total mass of the second stage is 1000 kg, of which 700 kg is fuel. What is the final speed of the second stage
If the three friends pull the object at constant velocity for 10 m, how much work have they done? What is the coefficient of kinetic friction between the object and the surface?
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if electrical energy costs 12 cents or 0.12 per kilowatt-hour then what would the following events cost?a burning a 40w
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You are traveling in a convertible with the top down. How far has the car moved when you get a chance to catch the tomato
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