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qwelly [4]
2 years ago
11

The transformation (X,Y) ➔ (2X, 2Y) is applied to triangle DEF. That image is then rotated 900 counterclockwise. If the coordina

te of point F is (-3,2) what will be the coordinate of F’’?
a. (-6,4)
b. (-4,-6)
c. (6,-4)
d. (4,-6)
Geography
1 answer:
Norma-Jean [14]2 years ago
8 0
The answer is c. (6, -4)


-3 times 2 is -6 and 2 times 2 is 4. So after the transformation we are left with (-6,4).
Since 900 is just 360 to times plus 180; rotating it basically means that it will end up in the same place and if we rotated it 180. These means we need to switch the signs on the numbers (positive to negative and vice-versa). Which gives us the answer of (6,-4).
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Seventeenth century Polynesia under went severe change brought about by___?
matrenka [14]
Wassup the answer is 

<span>European colonization, forced slavery, and deadly diseases
</span>
This is correct so gOod luck
4 0
3 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

4 0
3 years ago
What causes currents to flow between the poles and the equator?
zhenek [66]

Answer:

B. The Coriolis effect

Explanation:

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  • <u>This up-down movement created by the rotation is a significant life in the balance of the temperatures on the earth. </u>
  • <u>And hence creates a  pattern of the movement of the warm and the cold current in the ocean that heats and respectively warm and cools the temperature of the coastal and with there respective periods.</u>
7 0
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Read 2 more answers
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topjm [15]
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3 years ago
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Kingdoms of the Sahel were located near each of the following rivers except the __________.
GalinKa [24]
C. Im pretty sure is the answer..
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