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morpeh [17]
3 years ago
9

Show that the equilibrium temperature of the surface of the moon is 273 K assuming it has an albedo of 0.08.

Physics
1 answer:
const2013 [10]3 years ago
4 0

Answer:

The equilibrium temperature of the surface of the moon can be found by the formula as follows:

T=(\frac{K_s(1-alebdo)}{4 \sigma})^{\frac{1}{4}}

Where K_s = 1366 W/m^2 is the solar constant and \sigma = 5.67 \times 10^ {-8}W/m^2K^{-4} is the Stefan's Boltzmann constant.

T=(\frac{1366(1-0.08)}{4\times 5.67 \times 10^ {-8}})^{\frac{1}{4}} = (55.41\times 10^8)^{\frac{1}{4}} = 272.7 K=273 K

Thus, the equilibrium temperature of the surface of the moon is 273 K.

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As an interstellar cloud of hydrogen gas shrinks in size, its rate of rotation
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Answer:

INCREASES, BECAUSE ITS ANGULAR MOMENTUM IS CONSERVED.

Explanation: Interstellar cloud of Hydrogen is an accumulation of Hydrogen gas in the cloud.

As the Interstellar cloud of Hydrogen shrinks (reduces) in size,the rate of rotation of the shrinked Interstellar cloud Increases because its angular momentum is conserved. GASEOUS MOLECULES MAKE UP ABOUT 99% OF THE INTERSTELLAR CLOUD WITH HYDROGEN HAVING ABOUT 90% OF THE VOLUME OF GASES IN THE INTERSTELLAR CLOUD.

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3 years ago
The law of universal gravitation states that any two objects in the universe, without exception,
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A. attract each other.

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3 years ago
Convert 56 kilometers to inches
svlad2 [7]
The conversion for km to inches is:

1km=39370.1in

Now we can solve for 56 km..

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7 0
3 years ago
Take a look at a bicycle with gears. Using what you have just learned, answer the following questions:
Harlamova29_29 [7]

Answer:

answer a: a large front gear with a small back gear

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3 years ago
A cart is pulled by a force of 250 N at an angle of 35° above the horizontal. The cart accelerates at 1.4 m/s2. The free-body di
Pachacha [2.7K]

Answer:

m=146.277kg which is rounded to 146kg

Explanation:

Remember that F=ma

But F represents not 250N, but 250cos(35)N since the force is being pulled above the horizontal.

So 250cos(35)=204.7880111 approximately, and since a=1.4m/s^2, we have 204.7880111=m(1.4m/s^2). Then we divide both sides by the acceleration to get the mass. So m=146.2771508kg which the nearest number is 146kg

Mass is always in kg, unless stated otherwise.

4 0
3 years ago
Read 2 more answers
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