3 years ago

How are galaxies named?

1 answer:

5 0

Answer:

Some galaxies are given descriptive names (e.g. "Andromeda", "Whirlpool") if they are particularly distinctive in location or appearance. But most galaxies are known from their designation in a catalogue. One of the earliest catalogues of objects in the sky was made by Charles Messier.

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melisa1 [442]

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3 years ago

How does tripling the distance between two objects affect the gravitational force between them?

Wewaii [24]

It weakened the gravitational force between the oblects.

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A circular pipe of 25-mm outside diameter is placed in an airstream at 25C and 1-atm pressure. The air moves in cross flow over

kifflom [539]

Answer:

f_D = =3.24 N/m

Explanation:

data given

properties of air $\nu\ of air =19.31*10^{-6} m2/s$

$\rho = 1.048 kg/m3$

k = 0.0288 W/m.K

WE KNOW THAT

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$= \frac{ 15*0.025}{19.31*10^{-6}}$

= 1.941 *10^4

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$C_D = \frac{f_D}{A_f\frac{\rho v^2}{2}}$

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therefore Drag force is

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3 years ago

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