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3 years ago

A man weighing 75 kg takes 5 minutes to reach a height of 5 m when he climbs a staircase. What is his power?

Chemistry

1 answer:

Naddika [18.5K]3 years ago

4 0

Answer: B. 12.25 W

please give brainliest!

Explanation:

1) Force = Weight = 75 x 9.8 = 735 N

2.)Work = Force x Height = 735 x 5 = 3675 J

3.)Power = Work / Time = 3675 / (5 x 60) = 12.25 W

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The star betelgeuse is 325 light years away. If it were to explode in a supernova tonight, would we know? Explain your answer.

Dahasolnce [82]

Answer:

We will not know immediately

Explanation:

The distance of star Betelgeuse = 325 light years

Therefore, if it where to explode, at the location, we would have a supernovae such that the luminosity of the star multiplies several multiple times

However, due to the distance of Betelgeuse from the Earth, it will take the light of the explosion, 325 years to reach Earth and the explosion as it happens will not be noticed here on Earth immediately

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3 years ago

When you shine a white light through a prism the light is split into the different colors of the rainbow what are the colors tha

kkurt [141]

Answer:

Red, orange, yellow, green, blue, indigo, and violet.

Explanation:

These are the colors that light takes on when split using a prism. These are the same colors that are in a rainbow. You can remeber these colors using this acronym:

R.O.Y G. B.I.V

It's kinda like a name!

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4 years ago

Read 2 more answers

The vapor pressure of pure water at 250C is 23.77 torr. What is the vapor pressure of water above a solution that is 1.500 m glu

Olegator [25]

Answer:

Vapor pressure of water = 23.14torr

Explanation:

When you made a solution, vapor pressure decreases following Raoult's law:

$P_{solution} = X_{solvent} P_{solvent}$

<em>Where P is vapor pressure and X mole fraction</em>

As vapor pressure of water is 23.77torr we must find the mole fraction of water knowing the solution is 1.500m glucose (That is 1.500 moles of glucose per kg of water = 1000g of water).

1000g of H₂O are, in moles (Molar mass: 18.02g/mol):

1000g H₂O ₓ (1mole / 18.02g) = 55.5 moles of H₂O.

As we know now the solution contains 55.5 moles of water and 1.5 moles of glucose. Thus, mole fraction of water (Solvent) is:

$X_{H_2O} = \frac{55.5molesH_2O}{55.5molesH_2O + 1.5 molesGlucose} = 0.9737$

Replacing in Raoult's law, pressure of water above the solution is:

$P_{solution} = X_{solvent} P_{solvent}$

$P_{solution} = 0.9737*23.77torr$

<h3>Vapor pressure of water = 23.14torr</h3>

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4 years ago

Calculate the formula unit mass of Sodium hydroxide.

Ksivusya [100]

Answer:

MNa=22.989 g/mol.

MO=15.999 g/mol.

MH=1.0079 g/mol

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3 years ago

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exis [7]

Brass is a homogeneous mixture.

In the liquid state, the copper and zinc formed a solution.

They did not separate from each other when the brass solidified.

Thus, brass is a solid solution.

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3 years ago