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Alekssandra [29.7K]
3 years ago
8

43.278 kg - 28.1 g use significant figures rule

Physics
1 answer:
Alecsey [184]3 years ago
3 0
You cannot directly subtract the given values because their units are different. To be consistent, let's convert kilograms to grams with the conversion that 1,000 g = 1 kg.

43.278 kg(1,000 g/1 kg) - 28.1 g = 43249.9 grams

In subtraction, you will base the number of significant figures to the least of the given data. Since 28.1 has 3 significant figures, the answer should also contain 3 significant figures. Thus, it is much more convenient to report it in terms of kilograms.

43249.9 grams * 1 kg/ 1,000 g = 43.2 kg
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Explanation:

A)

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B)

For a solid substance at its melting point, the amount of heat needed to melt completely the substance is given by

Q=m\lambda_f

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For a liquid substance at its boiling point, the amount of heat needed to boil completely the substance is given by

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