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ziro4ka [17]
2 years ago
12

Based on this diagram, which type of stars would belong to spectral class M and have the

Chemistry
1 answer:
mixas84 [53]2 years ago
6 0

Answer:J , the answer is super giants

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20. What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to
Aneli [31]

Answer:

The correct answer is b. 1280 cm^2

4 0
3 years ago
An unknown radioactive substance has a half-life of 3.20hours . If 46.2g of the substance is currently present, what mass A0 was
iogann1982 [59]

Answer:

a) a0 was 46.2 grams

b) It will take 259 years

c) The fossil is 1845 years old

Explanation:

<em>An unknown radioactive substance has a half-life of 3.20hours . If 46.2g of the substance is currently present, what mass A0 was present 8.00 hours ago?</em>

A = A0 * (1/2)^(t/h)

⇒ with A = the final amount = 46.2 grams

⇒ A0 = the original amount

⇒ t = time = 8 hours

⇒ h = half-life time = 3.2 hours

46.2 = Ao*(1/2)^(8/3.2)

Ao = 261.35 grams

<em>Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 34.0% of an Am-241 sample to decay?</em>  

t = (ln(0.66))-0.693) * 432 = 259 years

It will take 259 years

<em>A fossil was analyzed and determined to have a carbon-14 level that is 80% that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil?</em>

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t = (ln(0.80))-0.693) * 5730 = 1845

The fossil is 1845 years old

7 0
3 years ago
What would you use if you needed to determine the density of an object
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In order to find the density of an object, you need to know the mass of the object and the volume.
That is why the unit of density is kg/m3.
Hope it helps
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Why do living things need carbon
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2 years ago
This plant is grabbing onto the rod as it grows upward. Which tropism is this?
aliya0001 [1]
Thigmotropism is the answer
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3 years ago
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