An alien spacecraft moving with the speed of 0.30c with respect to Earth, fires photon torpedoes forward with speed of 0.86c, measured by an observer on Earth. How fast are the torpedoes observe to travel with respect to the alien spacecraft?

College Physics
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Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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An alien spacecraft moving with the speed of 0.30c with respect to Earth, fires photon torpedoes forward with speed of 0.86c, measured by an observer on Earth. How fast are the torpedoes observe to travel with respect to the alien spacecraft?

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