Suppose a starship had a mass of 1.25 x 109 kg and was initially at rest. If

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Suppose a starship had a mass of 1.25 x 109 kg and was initially at rest. If its “matter–antimatter engines” produced photons from electron–positron annihilation and focused them to travel backward out from the ship, how many photons would they have to emit to reach of the speed of light?
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College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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