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3 years ago

What are the maria composed of? Is this material found elsewhere in the solar system?

Physics

1 answer:

zepelin [54]3 years ago

6 0

Answer:

Basaltic Lava. It is very similar in composition to the basaltic lava on Earth.

Explanation:

Maria (Plural for Mare) are the huge dark plains on the Lunar surface. They were name as such as the ancient astronomer thought them to be sea (Latin meaning of mare is sea). As the astronomer's studied and observed Lunar surface further we got to know that these are not sea of water but huge plains filled with lava. These are easily visible to naked eye as dark spots on the Lunar surface.

These were formed due to ancient volcanic eruptions when the Moon was young. The study of these with Earth based observatories and Lunar missions have revealed a lot about the composition of these Lunar Maria. Major composition of them is Basaltic Lava very similar to that of Earth. They are iron rich which makes them less reflective in comparison to the highlands.

Elemental composition of the Lunar Maria is as follows:

1. Silica (SiO₂) - 45.4%

2. Alumina (Al₂O₃) - 14.9%

3. Iron Oxide (FeO) - 14.1%

4. Lime (CaO) - 11.8%

5. Magnesia (MgO) - 9.2%

6. Titanium Oxide (TiO₂) - 3.9%

7. Sodium Oxide (Na₂O) - 0.6%

The percentage of these elements is very similar to that on Earth.

The high percentage of Aluminum can be attributed to the replacement of Iron by anorthosites (which are mostly composed of plagioclase feldspar). Anorthosites replaced iron and magnesium in the continental areas.

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A man 2 m tall walks horizontally at a constant rate of 1 m/s toward the base of a tower 23 m tall. When the man is 10 m from th

Evgen [1.6K]

Answer:

$\dfrac{d\theta}{dt}=0.038\ rad/s$

Explanation:

Given that

$\dfrac{dx}{dt}= -1\ m/s$

From the diagram

$tan\theta=\dfrac{21}{x}$

By differentiating with time t

$sec^2\theta \dfrac{d\theta}{dt}=-\dfrac{21}{x^2}\dfrac{dx}{dt}$

When x= 10 m

$tan\theta=\dfrac{21}{10}$

θ = 64.53°

Now by putting the value in equation

$sec^2\theta \dfrac{d\theta}{dt}=-\dfrac{21}{x^2}\dfrac{dx}{dt}$

$sec^264.53^{\circ} \dfrac{d\theta}{dt}=-\dfrac{21}{10^2}\times (-1)$

$\dfrac{d\theta}{dt}=0.038\ rad/s$

Therefore rate of change in the angle is 0.038\ rad/s

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3 years ago

A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the s

vlabodo [156]

Answer:

The answer is (a.) An upward force balances the downward force gravity on the skydiver

The skydiver is falling at a constant velocity because the upward force is balancing the downward force of gravity. According to Newton, the opposite force balance each other. This is stated in Newton's second law of motion.

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3 years ago

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A bird flies 2 km to the south then 0.2 km to the north . What is the displacement of the bird?

lidiya [134]

The displacement of the bird is 1.8 km...because displacement is the distanse of the object from mean position to the travelled position.....hope it helps

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3 years ago

Read 2 more answers

In a typically constructed research study, the experimental group is selected:

blondinia [14]

Answer:

D. from a separate pool than is the control group.

Explanation:

in the picture the person answers is backwards but...

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7 0

2 years ago

Which of the following statements is not one of Newton's laws of motion?

Alex17521 [72]

Answer:

The answer to your question: d.

Explanation:

a. The rate of change of momentum of an object is equal to the net force applied to the object.

This is the second a law of motion, so this answer is incorrect.

b. In the absence of a net force acting on it, an object moves with constant velocity.

This is the first Newton law of motion, so this option is not correct.

c. For any force, there always is an equal and opposite reaction force.

This is the third law of motion, so this is not the right option.

d. What goes up must come down.

Newton said this sentence, but is not part of the law of motion.

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3 years ago