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2 years ago

11

Where is the United States located? (Choose 2) A in the eastern hemisphere B in the southern hemisphere C in the northern hemisp

here D in the western hemisphere Submit Answer

1 answer:

Colt1911 [192]2 years ago

4 0

C is the correct answer The United States is located in the northern hemisphere

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Why is helot important

Masja [62]

The Helots were Greeks that had been captured and enslaved by Spartans. The Helots performed many important duties in Sparta, including working on the land to produce food.

The Helots were incredibly important in the social structure of the Spartan society, because each Spartan householder needed to contribute a certain amount of food for the messes, and without the Helots tilling and taking care of the land, this could not be possible.

But the Helots were considered as the lowest class in the society and kept under constant watch.

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2 years ago

All of these countries specialize in raising sheep EXCEPT?

prohojiy [21]

Answer:

Syria

Explanation:

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2 years ago

Imagine that you have obtained spectra for several galaxies and have measured the observed wavelength of a hydrogen emission lin

Lerok [7]

Answer:

A. z (galaxy 1) = -0.00515, z (galaxy 2) = -0.01707, z (galaxy 3) = -0.04008

B. v (galaxy 1) = -0.00517c, v (galaxy 2) = -0.01707c, v (galaxy 3) = -0.0401c

C. d (galaxy 1) = -21 Mpc,d (galaxy 2) = -69.4 Mpc, d (galaxy 3) = -163 Mpc

Explanation:

We begin by listing out the parameters we were given:

λ (obsv) = 656.3 nm, λ (emit 1) = 659.7 nm, λ (emit 2) = 667.7 nm,

λ (emit 3) = 683.7 nm

A) Using the Redshift formula, we have:

z = [λ (obsv) - λ (emit)] ÷ λ (emit)

For galaxy 1:

z = [λ (obsv) - λ (emit 1)] ÷ λ (emit 1)

z = (656.3 - 659.7) ÷ 659.7 = -0.00515

z = -<u>0.00515</u>

For galaxy 2:

z = [λ (obsv) - λ (emit 2)] ÷ λ (emit 2)

z = (656.3 - 667.7) ÷ 667.7 = -0.01707

z = -<u>0.01707</u>

For galaxy 3:

z = [λ (obsv) - λ (emit 3)] ÷ λ (emit 3)

z = (656.3 - 683.7) ÷ 683.7 = -0.04008

z = -<u>0.04008</u>

B) Using the Doppler formula, we have:

(Δλ ÷ λ) = v ÷ c

v = c * (Δλ ÷ λ)

but, z = (Δλ ÷ λ)

⇒ v = c * z

speed of light (c) = 3 x $10^{8}$ m/s

For galaxy 1:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.00515)

v = -1.55 x $10^{6}$ m/s

v = -<u>0.00517c</u>

For galaxy 2:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.01707)

v = -5.12 x $10^{6}$ m/s

v = -<u>0.01707c</u>

For galaxy 3:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.04008)

v = -12.03 x $10^{6}$ m/s

v = -<u>0.0401c</u>

N.B: the negative value of velocity connotes that the galaxies are moving away from us (not towards us)

C) Using Hubbleʹs law, we have:

v = H · d

where:

v = velocity of a galaxy (km/s), d = distance (Mpc),

H = Hubble's constant (km/s/Mpc) = 73.8 km/sec

d = v ÷ H

We use the velocities calculated in B) above

For galaxy 1:

v = -1.55 x $10^{3}$ km/s

d = -1.55 x $10^{3}$ ÷ 73.8

d = -<u>21 Mpc </u>

For galaxy 2:

v = -5.12 x $10^{3}$ km/s

d = -5.12 x $10^{3}$ ÷ 73.8

d = -<u>69.4 Mpc </u>

For galaxy 3:

v = -12.03 x $10^{3}$ km/s

d = -12.03 x $10^{3}$ ÷ 73.8

d = -<u>163 Mpc</u>

N.B: distance cannot be a negative value

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2 years ago

The European Union (EU) was formed to advance the economic goals of Europe. Countries of the EU open their borders to member nat

REY [17]

The type of region described is an economic region because many of the goals of the EU have to do with trade, jobs, and the economy.

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2 years ago

Read 2 more answers

In 1993, North Korea withdrew from

frez [133]

Answer:

a nuclear weapons treaty (nuclear non-proliferation)

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2 years ago