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1) In 2014 the Rosetta spacecraft, orbiting the comet 67P/Churyumov-Gerasimenko, measured the rotation period of the comet's...

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Physics

1) In 2014 the Rosetta spacecraft, orbiting the comet67P/Churyumov-Gerasimenko, measured the rotation period of thecomet's nucleus at 12.404 h. By the time the Rosetta mission endedin 2016, the period had decreased by 21 min. Find the new rotationperiod, expressed in hours.

2) In Earth’s current epoch, the length of the day is some86,400.002 ss.

If that were to increase to 86,400.0108 ss, how would you reportthe increase?

Express your answer with the appropriate units.

3) Add 3.13105 mm and 2.23103 kmkm .

Express your answer with the appropriate units.

4) Add 1.46 mm and 2.3 cmcm.

Express your answer in meters.

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