Physics: Principles and Problems

Chapter 9: Momentum and Its Conservation

Problem of the Week

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  The craft will not actually need all this time to achieve 22 000 mph because it will have an initial velocity due to Earth's orbital speed around the sun. This initial velocity will be on the order of thousands of miles per hour.
 
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  Calculate the number of xenon ions, N, by using the mass number of xenon, Z = 131 g/mol and the Avogadro constant, NA
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  8.2 x 1018 xenon ions per second are expelled from the engine.
 
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