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sergeinik [125]
3 years ago
5

Discuss why the article says the fact that we’re in our universe complicates our understanding of the expansion of the universe.

Physics
2 answers:
disa [49]3 years ago
7 0
It means that that being in just one universe makes it harder to grasp it's expansion
MArishka [77]3 years ago
4 0
<span>Because of our perception of the universe from inside the universe, we are unable to see how and towards what the universe is expanding. Also, our understanding of it is further complicated because we are moving as part of the expansion, thus distorting our perception of it.</span>
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How much heat energy (in megajoules) is needed to convert 7 kg of ice at -9°C C to water at 0°C?
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Answer:

hence option A is correct

Explanation:

heat required from -9°C to 0°C ice = mass × specific heat of ice ×change in temperature

heat required from -9°C to 0°C ice = 7×2100×9 =132300 J =0.1323 MJ

( HERE SPECIFIC HEAT OF ICE IS A CONSTANT VALUE OF 2100

J/(kg °C )

heat required from  0°C ice to 0°C water = mass× specific heat of fusion of ice

                                                             = 7×3.36×10^5

                                                              = 2.352 × 10^6 J

                                                              = 2.352 MJ

TOTAL HEAT ENERGY REQUIRED = 0.1323 MJ +2.352 MJ

                                                          = 2.4843 MJ

hence option A is correct

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