Physics

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A rocketship, travelling away from earth with a speed of 0.8c, sends regular radio signals which are received on Earth every 45.2 min. According to the rocketship astronauts, how frequently are the signals being sent?

I really need help. Its a basic question yet har for me.

Question: Find the only integer between 1500 and 2500 which is an integral multiple of both 2 to the power of 5 and 2 to the power of 5 subtract 1.

Christine can you please answer my question. Its a very kissy question since I am a kid. Search my post please.

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