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erastovalidia [21]
3 years ago
14

Please help me with this question someone

Physics
2 answers:
Gekata [30.6K]3 years ago
8 0
From the answers provided, I believe the possible answer would be the last option, silicon, oxygen, and one or more metals. Here's my reasoning: the most abundant mineral group found in the Earth's crust is the silicate group. The silicate materials contain both oxygen and silicon. Silicates are the most common minerals in the rock-formation process, and it has, in fact, been estimated that they make up 75 to 90 percent of the Earth's crust. From this piece of evidence, I can guess that the answer will possibly be D, silicon, oxygen, and one or more metals.
It should also be noted that the additional elements that combine with the silicon-oxygen tetrahedron are involved with the other elements commonly found in the Earth's crust and mantle. They are aluminum, calcium, iron, magnesium, potassium and sodium.
Marianna [84]3 years ago
5 0
The last option, silicon, oxygen, and one or more metals
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Answer:

In order to lift off the ground, the air in the balloon must be heated to 710.26 K

Explanation:

Given the data in the question;

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F - Mg - m_gg = 0

where M is the mass of the balloon and its occupants, m_g is the mass of the hot gas inside the balloon.

the force acting upward F = Vρg

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Vρg - Mg - m_gg = 0

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m_g =  Vρg/g - Mg/g

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from equation 1 and 2

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P = 1.01 × 10⁵ Pa

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we know that; R = 8.31 J/mol.K and the molecular mass of air μ = 29 × 10⁻³ kg/mol

T = [ (29 × 10⁻³) × (1.01 × 10⁵) × 480 ] / [ (( 1.29 × 480 ) - 381)8.31 ]

T =  1405920 / 1979.442

T =  710.26 K

Therefore, In order to lift off the ground, the air in the balloon must be heated to 710.26 K

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