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natima [27]
4 years ago
9

Stars making a circular motion across the sky is evidence of

Chemistry
2 answers:
lutik1710 [3]4 years ago
7 0

Answer:

because they are actually moving, or because they reflect our motion through space.

Sedaia [141]4 years ago
4 0

Explanation:

Stars making a circular motion across the sky is evidence of the earth's rotation.

This is because when the earth rotates it appears to us like the stars are moving.

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32. A sample of potassium is composed of 23% K-39, 48% K-40 and the remainder K-41. Calculate the average mass
mario62 [17]

Answer:

40.06 amu.

Explanation:

From the question given above, the following data were obtained:

Isotope A (K-39)

Mass of A = 39 amu

Abundance of A = 23%

Isotope B (K-40)

Mass of B = 40 amu

Abundance of B = 48%

Isotope C (K-41)

Mass of C = 41 amu

Abundance of C = 100 – (23 + 48)

Abundance of C = 100 – 71

Abundance of C = 29%

Average mass =?

Average mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(39 × 23)/100] + [(40 × 48)/100] + [(41 × 29)/100]

= 8.97 + 19.2 + 11.89

= 40.06 amu

Thus, the average mass of potassium is 40.06 amu

7 0
4 years ago
What is an example of a Low Energy-created depositional environment?
sweet-ann [11.9K]

Answer:

River flood plains, swamps, lakes, lagoons, marshes, and offshore.

Explanation:

Slow-moving currents prevent coarse-grained sediment from migrating into low-energy depositional environments. Fine materials can be carried long distances before they can settle out in the absence of waves and currents.

4 0
3 years ago
Help! Will mark brainliest!
iris [78.8K]

Answer:

B / To pump blood

Explanation:

Homie, you cant be serious right now.

3 0
3 years ago
Scientists have observed that hurricanes are strongest over water, and that hurricanes lose momentum and become weak when they r
asambeis [7]

Answer:

Explanation:                                                                                        

4 0
3 years ago
what do Mars, Mercury, and Venus have in common? A. They have a gas surface composition and a thick atmosphere. b They have many
mario62 [17]

Answer:

the best guess would have to be C

3 0
3 years ago
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