Why dont galaxies fly apart?

1 answer:

8 0

Hey you!

No one really knows why galaxies don't fly apart. Blackholes do, very strongly, have a gravitational pull on them, but that isn't enough to keep billions of stars and planets and other space matter in orbit around them. Although, the stars and gases are held together by the gravity of dark matter, so, you could say that explains why.

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2. A car is sitting at the top of a hill that is 14 m high. The car has a mass of 53 kg. The car has

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The car has gravitational potential energy (Eg)

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stich3 [128]

Answer:

3. 560W

Explanation:

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W = Fs = 700 * 8 = 5600J

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How far does a 26" bicycle wheel travel at 8 miles per hour?

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A force AB of length 100m and weight 600N has its centre of gravity 4.0 m from the end, and lies on horizontal ground calculate

Stells [14]

Answer:

F = 24 N

Explanation:

In this exercise we have a bar l = 100 m with a center of gravity x = 4 m, which force is needed to lift it from the other end

Let's use the rotational equilibrium relationship, where we consider the counterclockwise rotations as positive and fix the reference system at the point closest to the center of gravity

∑ τ = 0

F l -x W = 0

F = $\frac{x}{l} \ W$

let's calculate

F = $\frac{4}{100}$ 4/100 600

F = 24 N

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