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likoan [24]
3 years ago
9

Which two elements are the most abundant in the Earth's crust? A. silicon and oxygen B. silicon and magnesium C. iron and nickel

D. iron and magnesium
Physics
2 answers:
mariarad [96]3 years ago
7 0

Answer: A. silicon and oxygen

Explanation:

The two most abundance elements in earth's crust are silicon and oxygen.

The most abundant element in earth's crust is Oxygen (O) which has a percentage composition of 46.6%.  Oxygen is mainly present as silicates, carbonates, sulphates etc.

The second most abundant element in earth's crust is Silicon (Si) which has a percentage composition of 27.7% . Silicon is present in the form of silicates.

The third most abundant element in earth's crust is aluminium (Al) which has a percentage composition of 8.1 %.

The fourth most abundant element in earth's crust is Iron (Fe) which has a percentage composition of 5.0 %.

Zigmanuir [339]3 years ago
7 0

Answer:

A

Explanation:

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A stone dropped from the root of a high buliding . A second stone is dropped 1.30 s later How far apart are the stones when the
oksian1 [2.3K]

Answer:

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Explanation:

<u>Second Stone:</u>

Vb= g*t

tb (14m/s)= Vb/g

tb (14m/s)= (14 m/s) / (9.8 m/s²)

tb (14m/s)= 1.42 sec

Hb= (g * tb²)/2

Hb= 9.88m

<u>First Stone:</u>

ta= tb + 1.3 sec

ta= 2.72 sec

Ha= (g*ta²)/2

Ha= 36.25m

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Ha-Hb= 26.37m

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3 years ago
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if 500 watts hit the surface of a solar panel every second and it generates 150 watts every second, how efficient is it?
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The electrical efficiency is defined as the ratio between the useful power output and the total power input:
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