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A 238/92U nucleus is moving in the x direction at 5.0 * 10^5 m/s when it decays into an alpha particle 4/2He and a 234/90Th. If the alpha particle moves off at 32 ° above the x axis with a speed of 1.4 * 10^7. Assume the uranium-thorium-alpha system is isolated; no pFBD or IST is required for this problem.

Write an expression for the conservation of momentun in the x direction.

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