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Mademuasel [1]
3 years ago
5

The milky way galaxy is most likely an example of which type of galaxy?

Physics
2 answers:
timofeeve [1]3 years ago
7 0
The Milky way galaxy belongs to so called Barred Spiral galaxies.
Art [367]3 years ago
4 0

Hey, how u doin'? Here's your answer.

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7.22 Ignoring reflection at the air–water boundary, if the amplitude of a 1 GHz incident wave in air is 20 V/m at the water surf
Serga [27]

Answer:

z = 0.8 (approx)

Explanation:

given,

Amplitude of 1 GHz incident wave in air = 20 V/m

Water has,

μr = 1

at 1 GHz, r = 80 and σ = 1 S/m.

depth of water when amplitude is down to  1 μV/m

Intrinsic impedance of air = 120 π  Ω

Intrinsic impedance of  water = \dfrac{120\pi}{\epsilon_r}

Using equation to solve the problem

  E(z) = E_0 e^{-\alpha\ z}

E(z) is the amplitude under water at z depth

E_o is the amplitude of wave on the surface of water

z is the depth under water

\alpha = \dfrac{\sigma}{2}\sqrt{\dfrac{(120\pi)^2}{\Epsilon_r}}

\alpha = \dfrac{1}{2}\sqrt{\dfrac{(120\pi)^2}{80}}

\alpha =21.07\ Np/m

now ,

  1 \times 10^{-6} = 20 e^{-21.07\times z}

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taking ln both side

21.07 x z = 16.81

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z = 0.8 (approx)

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3 years ago
A common misconception is that an object always moves when a force acts on it. Why is this statement incorrect? Explain the conc
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Answer:

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People have the misconception that when a force acts on an object it always produces motion

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The statement is incorrect because, a force acting on an object does not necessarily have to produce motion. It could be in static equilibrium where the net force is zero and produces not motion. The body could also be in dynamic equilibrium when  no net force acts on it moving at a constant velocity. But here we are concerned with static equilibrium since the body does not move at all.

People have the misconception that when a force acts on an object it always produces motion and, we have seen from the above tat its not always true.

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The distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists u
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Answer:

D

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D

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