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solmaris [256]
2 years ago
8

Which substance is a gas at room temperature and atmospheric pressure?

Physics
1 answer:
s2008m [1.1K]2 years ago
3 0

Answer:

Explanation:

A) Hg is mercury, a metal that is mostly liquid at STP (Standard Temp and Pressure), though some small portion of it will be gaseous in a closed container.

B) CH Methylidyne radical is a gas

It is not a stable compound because carbon has four valence electrons and only one of those is kept occupied by the hydrogen atom.

If this is supposed to be CH₄ which is methane, then also a gas at STP

C) C₂H₅OH is ethanol which is mostly a liquid at STP, though some small portion of it will be gaseous in a closed container.

D) H₂O is water and will be mostly liquid at STP, though some small portion of it will be gaseous in a closed container.

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3. An object of mass 90 kg travels down a slide.
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Answer:

3) Ep = 13243.5[J]

4) v = 17.15 [m/s]

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3) In order to solve this problem, we must use the principle of energy conservation. That is, the energy will be transformed from potential energy to kinetic energy. We can calculate the potential energy with the mass and height data, as shown below.

m = mass = 90 [kg]

h = elevation = 15 [m]

Potential energy is defined as the product of mass by gravity by height.

E_{p}=m*g*h\\E_{p}=90*9.81*15\\E_{p}=13243.5[J]

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4) The velocity can be determined by defining the kinetic energy, as shown below.

E_{k}=\frac{1}{2} *m*v^{2}  \\v = \sqrt{\frac{2*E_{k} }{m} }\\ v= \sqrt{\frac{2*13243.5 }{90} }\\v=17.15[m/s]

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2 years ago
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