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2 years ago

Why are satellites placed into orbit at least 150 km above Earth’s surface?

Physics

2 answers:

il63 [147K]2 years ago

5 0

Answer:

Satellites are placed into orbit at least 150km above Earth's surface to ensure that they remain above the atmosphere.

The velocity required to keep a balance between the inertia of the motion of the satellite and the earth's gravitational pull, which is called the orbital velocity, essentially depends on its distance above the surface of the Earth. The higher this distance, the longer the satellite will stay in the orbit. Otherwise it might run into the atmosphere and could get burnt up there.

hodyreva [135]2 years ago

4 0

Satellites are placed into orbit at least 150 km above Earth's surface to be above the atmosphere.

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There is less oxygen in air at higher altitudes than at sea level. Scientists have shown that people living at sea level have 5

Ivanshal [37]

Answer with Explanation:

"Red Blood Cells" (RBCs) contain Hemoglobin that is responsible for carrying oxygen into the body. When people are exposed to higher altitudes, the number RBCs in the body increases. This is because the body has a hard time taking in oxygen due to low atmospheric pressure. It makes it hard for oxygen to pass through the lung membranes. This is called "hypoxia." Such condition deprives the body from oxygen, thus, it creates more red blood cells in order to compensate the condition.

When it comes to people living at sea level, the oxygen can easily pass through the lung membranes due to higher atmospheric pressure. This doesn't require the body to build new RBCs. Therefore, the numbers of RBCs needed by people to thrive is lower than living at higher altitudes.

5 0

2 years ago

If E=1/2Av^2+Bmx find the dimensions of A and B(Where E is energy,v,m and x are velocity,mass and distance respectively)

sp2606 [1]

Answer:

A = [kg]

B = [m/s²]

Explanation:

E = ½ Av² + Bmx

Substitute the units:

[J] = ½ A [m/s]² + B [kg] [m]

A Joule written in base units is:

1 J = 1 Nm = 1 kg m²/s²

Each term must have the same units.

[kg m²/s²] = A [m/s]²

[kg m²/s²] = A [m²/s²]

A = [kg]

[kg m²/s²] = B [kg] [m]

B = [m/s²]

8 0

2 years ago

Need help with this! just scienceeeeeee

LiRa [457]

Answer:

7) λ = 0.5 m, 8) f = 4.8 10¹⁴ Hz

Explanation:

The speed of an electromagnetic wave is

c = λ f

where c is the speed of light in vacuum c = 3 10⁸ m / s

7) indicate the frequency f = 6.0 10⁸ Hz

we do not know the wavelength

λ = c / f

we calculate

λ = 3 10⁸ / 6.0 10⁸

λ = 0.5 m

8) indicate the wavelength λ = 6.25 10-7 m

we do not know the frequency

f = c / λ

we calculate

f = 3 10⁸ / 6.25 10⁻⁷

f = 0.48 10¹⁵ Hz

f = 4.8 10¹⁴ Hz

8 0

2 years ago

A force of 7.50N is applied to a spring whose spring constant is 0.289 N/cm. Find its change in length.

kotykmax [81]

Hook's law states that

$F=k\Delta x$

where F is the applied force, k is the spring constant, and $\Delta x$ is the change in length.

Plugging your values, we have

$7.5 = 0.289\Delta x \implies \Delta x = \dfrac{7.5}{0.289}\approx 25.95$

4 0

3 years ago

Is a compound considered a pure substance?

IgorLugansk [536]

Answer:

It depends on which compound you use carbon dioxide can be while helium will not but if you where to sum it up it would be use because simply most compounds are considered pure substance.

Explanation:

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2 years ago